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Author: Grafiati
Published: 4 June 2021
Last updated: 28 July 2024

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1

Tang, An, Tao Ma, Liduo Gu, Yongtao Zhao, Junhui Zhang, Haoming Zhang, Fengxiang Shao, and Hongsong Zhang. "Luminescence properties of novel red-emitting phosphor InNb1-xPxO4:Eu3+ for white light emitting-diodes." Materials Science-Poland 33, no. 2 (June 1, 2015): 331–34. http://dx.doi.org/10.1515/msp-2015-0050.

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AbstractInNb1-xPxO4:Eu3+ red phosphors were synthesized by solid-state reaction and their luminescence properties were also studied through photoluminescence spectra. The excitation and emission spectra make it clear that the as-prepared phosphors can be effectively excited by near-ultraviolet (UV) 394 nm light and blue 466 nm light to emit strong red light located at 612 nm, due to the Eu3+ transition of 5D0 → 7F2. The luminescence intensity is dependent on phosphorus content, and it achieves the maximum at x = 0.4. Excessive phosphorus in the phosphors can result in reduction of luminescence intensity owing to concentration quenching.With the increasing content of phosphorus, the phosphors are prone to emit pure red light. This shows that the InNb1.6P0.4O4:0.04Eu3+ phosphor may be a potential candidate as a red component for white light emitting-diodes.
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2

Liu, Rungang, Xueting Liu, Weikai Lin, and Yingliang Liu. "Solvothermal Treatment of Micron-Sized Commercial SrAl2O4:Eu2+, Dy3+ Phosphors and One-Step Preparation of Nanophosphors for Fingerprint Imaging." Applied Sciences 14, no. 9 (May 4, 2024): 3929. http://dx.doi.org/10.3390/app14093929.

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Preparing submicron and nanoscale phosphors with good optical properties for practical applications is a challenging task for current inorganic long afterglow luminescent materials. This study utilized commercialized SrAl2O4:Eu2+, Dy3+ phosphors (SAOED) as raw materials and employed solvents with lower polarity or non-polar solvents for dynamic solvothermal treatment. The commercialized phosphor’s overall average particle size was reduced from 42.3 μm to 23.6 μm while maintaining the fluorescence intensity at 91.39% of the original sample. Additionally, the study demonstrated the applicability of the dynamic solvothermal method to most other commercialized inorganic phosphors. The experiment produced a high-brightness nano-sized phosphor with a yield of 5.64%. The average diameter of the phosphor was 85 nm, with an average thickness of 16 nm. The quantum efficiency of the phosphor was 74.46% of the original sample. The fingerprint imaging results suggest that the nano-sized phosphors have potential for practical applications.
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3

Nguyen Thi, Dieu An, My Hanh Nguyen Thi, and Phuc Dang Huu. "Quantum dot phosphors CaS:Ce<sup>3+</sup> and CaS:Pb<sup>2+</sup>, Mn<sup>2+</sup> for improvements of white light-emitting diodes optic characteristics." International Journal of Electrical and Computer Engineering (IJECE) 12, no. 5 (October 1, 2022): 4782. http://dx.doi.org/10.11591/ijece.v12i5.pp4782-4789.

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<p>The goal of this study is to discover a new method that uses standard phosphors and quantum dots to improve the lighting qualities and heat manipulation of white light-emitting diodes (WLEDs). Despite the popularity as a good ingredient that offers good color rendering properties, quantum dots (QDs) have not been widely employed in the fabrication of WLEDs, particularly, the utilization of QDs-phosphor-mixed nanocomposite is limited. We propose a unique packaging design based on the research’s experimental findings. The layer of nanocomposites consisting of QDs and phosphors is horizontally positioned to the WLED for optimal lighting and heating efficiency. This study simulated and used four distinguishing white LEDs forms: mono-layer phosphorus, two double-layer remote phosphors featuring yellowish-red and yellowish-green organizations, and a triple-layer phosphor. In terms of color rendering and luminous outputs, the triple-layer phosphor configuration outperforms the other implementations, as per the finding.</p>
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4

Kwon, Seok Bin, Seung Hee Choi, Jung Hyeon Yoo, Seon Yeong Lee, Bo Young Kim, Ho Jung Jeong, Wan Ho Kim, et al. "Fabrication of LuAG:Ce3+ Ceramic Phosphors Prepared with Nanophosphors Synthesized by a Sol-Gel-Combustion Method." Micromachines 13, no. 11 (November 18, 2022): 2017. http://dx.doi.org/10.3390/mi13112017.

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The aim of this study was to investigate properties of ceramic phosphors fabricated using nano Lu3Al5O12:Ce3+ phosphors produced with a sol-gel-combustion method. These nano Lu3Al5O12:Ce3+ phosphors had a size of about 200 nm, leading to high density when fabricated as a ceramic phosphor. We manufactured ceramic phosphors through vacuum sintering. Alumina powder was added to improve properties. We mounted the manufactured ceramic phosphor in a high-power laser beam projector and drove it to determine its optical performance. Ceramic phosphor manufactured according to our route will have a significant impact on the laser-driven lighting industry.
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5

Liu, Sheng, Bei Ying Zhou, Shi Jia Gu, Lian Jun Wang, Wan Jiang, and Wei Luo. "A Promising Energy-Saving and Environmental-Friendly Lighting Device: High CRI White LED with Phosphor Materials." Materials Science Forum 848 (March 2016): 446–53. http://dx.doi.org/10.4028/www.scientific.net/msf.848.446.

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Two kinds of commercial LED phosphors (green phosphor LuAG:Ce3+ and red phosphor CaAlSiN3:Eu2+) with polymethyl methacrylate (PMMA) powders were mixed to prepare film phosphors with tunable emission peak in photoluminescence spectrum by flat vulcanizing machine under the temperature of 170 oC and pressure of 2 MPa. The physical phase, surface morphology, transmittance, luminescence spectra of samples were characterized by means of X-ray diffraction (XRD), Environmental scanning electron microscopy (ESEM), Ultraviolet-Visible (UV-Vis) spectrophotometry and Fluorescence spectrometer. The results show that the film phosphors phase was consistent with raw phosphors, phosphor particles were uniformly distributed, and fluorescence spectra with different proportions of phosphors in different position can be adjusted. Tested by HSP 3000 spectrum analyzer, the white LEDs fabricated by blue chip and composite film phosphor containing 5 wt% green phosphor and 1.5 wt.% red phosphor, which refers to the remote excitation technique, possessed color coordinate of (0.3715, 0.3280) and color rendering index (CRI) of 87 when it was driven at power of 36 V/140 mA, reaching the international advanced level.
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6

Zhang, Xing Hua, Zun Ming Lu, Fan Bin Meng, Long Hu, Xue Wen Xu, Jing Lin, and Cheng Chun Tang. "The Structure and Photoluminescence Properties of Ca3Si2O7: Eu2+ Phosphor." Advanced Materials Research 509 (April 2012): 192–96. http://dx.doi.org/10.4028/www.scientific.net/amr.509.192.

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A series of yellow-emitting phosphors based on a silicate host matrix, Ca3-xSi2O7: xEu2+, were prepared by solid-state reaction method. The structure and photoluminescent properties of the phosphors were investigated. The XRD results show that the Eu2+ substitution of Ca2+ does not change the structure of Ca3Si2O7 host. The SEM images display that phosphors aggregate obviously and the shape of the phosphor particle is irregular. The EDX results reveal that the phosphors consist of Ca, Si, O, and Eu elements. The Ca3-xSi2O7: xEu2+ phosphors can be excited at wavelength of 300-490 nm, which is suitable for the emission band of near ultraviolet or blue light-emitting-diode (LED) chips. The phosphors exhibit a broad emission region from 520 to 650 nm and the emission peak centered at 568 nm. The phosphor for has the strongest excitation and emission intensity, and the energy transfer style between Eu2+ ions is quadrupole-quadrupole interaction for higher concentration Eu2+ doped Ca3Si2O7 phosphor. The Ca3-xSi2O7: xEu2+ phosphors can be used as candidates for white LEDs.
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7

Adachi, Sadao. "Review—Photoluminescence Spectroscopy of Mn2+-Activated Phosphors: Part II. Some Representative Phosphors." ECS Journal of Solid State Science and Technology 12, no. 12 (December 1, 2023): 126004. http://dx.doi.org/10.1149/2162-8777/ad145d.

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The purpose of this review article, Part II, is to present the photoluminescence properties of Mn2+ ion in the intra-3d 5-shell electronic configuration activated in the various kinds of host materials. An analysis method presented in a separate article, Part I, are applied to the present Mn2+-activated phosphors. The characteristic photoluminescence (PL) properties for the Mn2+-activated phosphors are then discussed from a spectroscopic point of view. The phosphors considered herein can be classified into nine groups: (1) stoichiometric phosphor, (2) Mn2+-activated oxide phosphor, (3) Mn2+-activated phosphate phosphor, (4) Mn2+-activated nitride phosphor, (5) Mn2+-activated oxynitride phosphor, (6) Mn2+-activated chalcogenide phosphor, (7) Mn2+-activated halide phosphor, (8) Mn2+-activated organic−inorganic hybrid phosphor, and (9) Mn2+-activated multiple-site phosphor. The PL and PL excitation spectra are analyzed based on the theoretical modelling. Particularly, the effects of the lattice temperature on the PL intensity and luminescence lifetime are discussed in more detail. Key properties of the Mn2+-activated phosphors for use in a variety of device applications are also presented.
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8

Qin, Haiming, Jun Jiang, Zhaohua Luo, and Haochuan Jiang. "YAG phosphor with spatially separated luminescence centers." Journal of Materials Chemistry C 4, no. 2 (2016): 244–47. http://dx.doi.org/10.1039/c5tc03151f.

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9

Zhang, Ji Ming, Dong Lin Zhao, and Zeng Min Shen. "Synthesis and Luminescent Properties of Mn2+-Doped Zinc Silicate Phosphors by Sol-Gel Method." Key Engineering Materials 434-435 (March 2010): 214–16. http://dx.doi.org/10.4028/www.scientific.net/kem.434-435.214.

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Abstract. Green light emitting Mn2+-doped Zn2SiO4 (Zn2SiO4:Mn2+) phosphor nano-particles were synthesized by sol-gel method combined with a furnace firing from the sol-gel solution made with ZnO, MnCO3 and tetraethoxysilan. The influences of annealing temperatures on the microstructures and photoluminescent properties of the Zn2SiO4:Mn2+ phosphors were investigated. The structural details of the phosphors were examined through XRD and SEM. The photoluminescent properties of the Zn2SiO4:Mn2+ phosphors were characterized by excitation and emission spectra. The results indicate that the XRD patterns of the Zn2SiO4:Mn2+ phosphors exhibit a willemite structure (-Zn2SiO4). Green photoluminescence whose emission peak is located at 525 nm were observed from the synthesized phosphor particles under UV excitation. The photoluminescent mechanisms of the Zn2SiO4:Mn2+ phosphors were discussed.
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10

Lü, Xing Dong, Xiao Hua Liu, and Guo Sheng Gai. "Study of Organic Modification for SrAl2O4:Eu2+, Dy3+ Phosphors." Advanced Materials Research 58 (October 2008): 169–75. http://dx.doi.org/10.4028/www.scientific.net/amr.58.169.

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Methylaminopropyltrimethoxysilane (MAPS) coupling agent was used to pre-modify SrAl2O4:Eu2+, Dy3+ phosphors, and then graft methylmethacrylate (MMA) on SrAl2O4:Eu2+, Dy3+ phosphors. IR, SEM and TEM measurements showed that there is an organic encapsulation film composed of silane modified poly(methylmethacrylate) (PMMA) on phosphor surface. This organic film encapsulated on phosphor surface like dense reticulation with a thickness of 20-30 nm. The water resistance and oil absorption measurements and persistent luminescent properties showed that after being encapsulated, SrAl2O4:Eu2+, Dy3+ phosphors has much better water resistance and lower oil absorption with little loss of persistent phosphorescence. The emission intensity and afterglow lifetime of the encapsulated phosphors were reduced to 93% and 95% of the originals, respectively.
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11

Zhang, Weiyi, Can He, Xiaowen Wu, Ximing Huang, Fankai Lin, Yan’gai Liu, Minghao Fang, Xin Min, and Zhaohui Huang. "Yellow Emission Obtained by Combination of Broadband Emission and Multi-Peak Emission in Garnet Structure Na2YMg2V3O12: Dy3+ Phosphor." Molecules 25, no. 3 (January 27, 2020): 542. http://dx.doi.org/10.3390/molecules25030542.

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The fabrication and luminescent performance of novel phosphors Na2YMg2V3O12:Dy3+ were investigated by a conventional solid-state reaction method. Under near-UV light, the Na2YMg2V3O12 host self-activated and released a broad emission band (400–700 nm, with a peak at 524 nm) ascribable to charge transfer in the (VO4)3− groups. Meanwhile, the Na2YMg2V3O12:Dy3+ phosphors emitted bright yellow light within both the broad emission band of the (VO4)3- groups and the sharp peaks of the Dy3+ ions at 490, 582, and 663 nm at a quenching concentration of 0.03 mol. The emission of the as-prepared Na2YMg2V3O12:Dy3+ phosphors remained stable at high temperatures. The obtained phosphors, commercial Y2O3:Eu3+ red phosphors, and BaMgAl10O17:Eu2+ blue phosphors were packed into a white light-emitting diode (WLED) device with a near-UV chip. The designed WLED emitted bright white light with good chromaticity coordinates (0.331, 0.361), satisfactory color rendering index (80.2), and proper correlation to a color temperature (7364 K). These results indicate the potential utility of Na2YMg2V3O12:Dy3+ phosphor as a yellow-emitting phosphor in solid-state illumination.
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12

Chen, Bing-Mau, Shang-Ping Ying, Hsuan-Li Huang, and Yu-Chieh Cheng. "Cylindrical Rod Phosphor Structure for Laser-Driven White Lighting." Coatings 12, no. 11 (October 28, 2022): 1637. http://dx.doi.org/10.3390/coatings12111637.

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In this article, a cylindrical rod phosphor structure was developed and used for laser-driven white lighting. The blue light emitting from the laser diode (LD) with limited divergence enters the cylindrical rod containing phosphor and excites the yellow phosphor particles in the cylindrical rod to generate white light. Multiple phosphor blends with yellow and red phosphors were also applied to the cylindrical rod phosphor structure to enhance the red luminescence of white light with a low correlated color temperature (CCT). An advanced structure with a surrounding transparent layer around the central cylindrical rod containing phosphors was also investigated to enhance the possibility of the blue light absorption by phosphors in the cylindrical rod region away from the LD. The cylindrical rod phosphor structures with or without the surrounding transparent layer were fabricated to produce laser-driven white lighting, and the optical characteristics of the cylindrical rod phosphor structures with different phosphor concentrations or yellow-to-red phosphor weight ratios were examined.
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13

Xiao, Jun, Cong Wang, Xin Min, Xiaowen Wu, Yangai Liu, Zhaohui Huang, and Minghao Fang. "Multiple Energy Transfer in Luminescence-Tunable Single-Phased Phosphor NaGdTiO4: Tm3+, Dy3+, Sm3+." Nanomaterials 10, no. 7 (June 27, 2020): 1249. http://dx.doi.org/10.3390/nano10071249.

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Advances in solid-state white-light-emitting diodes (WLEDs) necessitate the urgent development of highly efficient single-phase phosphors with tunable photoluminescence properties. Herein, the Tm3+, Dy3+, and Sm3+ ions are incorporated into the orthorhombic NaGdTiO4 (NGT) phosphors, resulting in phosphors that fulfill the aforementioned requirement. The emission spectrum of Tm3+ ions overlaps well with the adsorption spectra of both Dy3+ and Sm3+ ions. Under the excitation at 358 nm, the single-phase NaGdTiO4: Tm3+, Dy3+, Sm3+ phosphor exhibits tunable emission peaks in the blue, yellow, and red regions simultaneously, resulting in an intense white-light emission. The coexisting energy transfer behaviors from Tm3+ to Dy3+ and Sm3+ ions and the energy transfer from Dy3+ to Sm3+ ions are demonstrated to be responsible for this phenomenon. The phosphors with multiple energy transfers enable the development of single-phase white-light-emitting phosphors for phosphor-converted WLEDs.
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14

Jia, Lin Yan, Zhong Bao Shao, and Jun Feng Han. "Luminescence Properties of ZnO:Eu3+ Red Emitting Phosphor Prepared by Precipitation Method." Advanced Materials Research 690-693 (May 2013): 594–97. http://dx.doi.org/10.4028/www.scientific.net/amr.690-693.594.

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Zinc oxide doped with Eu3+ ions red emitting phosphors were prepared by precipitation method, and its luminescence properties were investigated. The phosphors were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and photoluminescence (PL) spectra. The ZnO:Eu3+ phosphors were obtained at 600°C by calcining precipitation precursor. These phosphors can be effectively excited at 465nm. In emission spectra, the strongest peak at 616nm correlating to red emission is due to the electric dipole transition 5D07F2 of Eu3+ ions. Eu3+ions replaced Zn2+ ions and occupied the non-centrosymmetric sites in the ZnO matrix lattice. The phosphor particles with narrow distribution range are approximately 100-200nm in size. The luminescence properties of ZnO:Eu3+ phosphor with 8 mol% doping concentration of Eu3+ is optimal.
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15

Srivastava, Alok M., and Timothy J. Sommerer. "Fluorescent Lamp Phosphors." Electrochemical Society Interface 7, no. 2 (June 1, 1998): 28–31. http://dx.doi.org/10.1149/2.f06982if.

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Fluorescent lamp phosphors convert the ultraviolet emission of a rare-gas/mercury discharge plasma into visible (white) light. The phosphor is responsible for nearly all the visible light produced by the lamp with the visible mercury lines contributing only a few percent to the total lamp light output. This article reviews fluorescent lamp phosphors that are used in general purpose illumination.
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16

Lisitsyn, Lisitsyna, Tulegenova, Ju, Polisadova, Lipatov, and Vaganov. "Nanodefects in YAG:Ce-Based Phosphor Microcrystals." Crystals 9, no. 9 (September 11, 2019): 476. http://dx.doi.org/10.3390/cryst9090476.

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The present paper focused on the study of spectral–kinetic characteristics of luminescence in two batches of yttrium aluminum garnet (YAG):Ce-based phosphors synthesized in different years by two manufacturers: NPO “Platan” in Russia and “GrandLux” in the People’s Republic of China (PRC). Upon studying the structural characteristics of the phosphors—elemental composition, morphology, and X-ray diffraction (XRD) patterns—it was concluded that both types of YAG:Ce phosphors are highly imperfect. The presence of heterogeneities of different nature was accompanied by the introduction—to compensate for charges and elastic stresses—of intrinsic lattice defects during synthesis. There is a high probability of creating complex defects during phosphor synthesis. Luminescence properties (full width at half maximum (FWHM), spectral position of the emission peaks, excitation spectra of emission, emission decay time) are affected by the nearest environment of the luminescence center; whereas the degree of correlation of defects (distance between the components of the donor–acceptor pair) does not depend on the concentration of impurities, intrinsic defects, and their ratio. The results do not fit into the framework of existing ideas regarding the processes in phosphors as systems with widely distributed luminescence centers. The patterns obtained in the paper are discussed based on a hypothesis according to which a nanodefect phosphorus crystal phase is formed during the synthesis.
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17

Sarda, Narendra G., Hiroshi Fujigaki, Yuma Ogita, Andrew Chan, Kei-Ichiro Murai, Geoffrey I. N. Waterhouse, and Toshihiro Moriga. "Photoluminescence Properties of (Ba1-(x+y)SrxEuy)2Si6O12N2 Phosphors for White LED Applications." Journal of Nano Research 36 (November 2015): 1–7. http://dx.doi.org/10.4028/www.scientific.net/jnanor.36.1.

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(Ba1-(x+y)SrxEuy)2Si6O12N2 oxynitride phosphors were successfully synthesized by the solid-state reaction method at 1200°C under a H2(5%) + N2(95%) atmosphere. The Sr2+ content (x) was varied in the range 0-0.6 and the Eu2+ content varied in the range 0.05-0.25, with the Si/(Ba+Sr+Eu) ratio fixed at 3. Results showed that the emission characteristics of (Ba1-(x+y)SrxEuy)2Si6O12N2 phosphors under UV or blue-light excitation was strongly dependent on the chemical composition. The phosphor (Ba0.95Eu0.05) Si6O12N2 showed an intense green emission peak at 520 nm, whilst the phosphor (Ba0.45Sr0.5Eu0.05)Si6O12N2 had a weaker emission maximum at 548 nm. Ba2+ substitution with Sr2+ decreased the lattice volume of the (Ba1-(x+y)SrxEuy)2Si6O12N2 phosphors and was responsible for the red-shift in the emission peak. Optimization of the Eu2+ concentration at a fixed Sr2+ content of 0.2 identified the phosphor (Ba0.65Sr0.2Eu0.15)2Si6O12N2 as a potential alternative to YAG:Ce yellow phosphors for white LED applications.
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18

Trivellin, Nicola, Matteo Meneghini, Matteo Buffolo, Gaudenzio Meneghesso, and Enrico Zanoni. "Analysis and Reliability Study of Luminescent Materials for White Lighting." Proceedings 2, no. 17 (May 15, 2018): 1158. http://dx.doi.org/10.3390/ecms2018-05233.

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In this work, we report on the characterization and reliability/stability study of phosphorescent materials for lighting applications. More specifically, we investigated (a) phosphors directly deposited over light-emitting diodes (LED) chip, (b) remote phosphor (RP) solutions encapsulated in plastic medium for LED lighting, and (c) phosphors without binder for extreme high-intensity laser diode white lighting. The optical and thermal properties of phosphors were studied to develop a sample based on a mix of phosphor compounds in order to achieve different correlated color temperatures (CCT) and high color rendering index (CRI) LEDs. Thermal properties of cerium-doped YAG (Yttrium Aluminum Garnet) phosphor materials were evaluated in order to study thermal quenching. A maximum phosphor operating temperature of 190–200 °C was found to cause a sensible efficiency degeneration. Reduced efficiency and Stokes shift also caused a localized temperature increase in the photoluminescent materials. In the case of remote phosphors, heat did not find a low thermal resistance path to the heatsink (as occurred through the GaN LED chip for direct phosphor-converted devices) and thermal analysis indicated that material temperature might therefore increase to values in excess of 60 °C when a radiation of 435 mW/cm2 hit the sample template. Reliability was also investigated for both plastic-encapsulated materials and binder-free depositions. Pure thermal reliability study indicated that phosphors encapsulated in polycarbonate material were stable up to temperature of approximately 100 °C, while binder-free phosphor did not show any sensible degradation up to temperatures of 525 °C.
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19

Baig, Nahida, N. S. Dhoble, N. S. Kokode, and S. J. Dhoble. "Photoluminescence Properties of Eu3+ and Ce3+ Activated Calcium Chlorophosphate Via Combustion Synthesis Method." Oriental Journal of Physical Sciences 1, no. 1-2 (August 24, 2016): 10–15. http://dx.doi.org/10.13005/ojps01.0102.03.

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Calcium chlorophosphate (Ca2PO4Cl) phosphors, activated by rare earth ions Eu3+ and Ce3+ were prepared by urea assisted combustion synthesis technique and their characterization and luminescent properties were studied. The synthesized phosphors were investigated by powdered XRD, SEM and Photoluminescence characterization (PL) methods. PL excitation spectra of Ca2PO4Cl:Eu3+/Ce3+ phosphor exhibit narrow bands in the near ultra violet (n-UV) range, and the PL emission spectra of Ca2PO4Cl: Eu3+/Ce3+ phosphor shows sharp narrow bands typical of rare earth ions. The bands observed in the PL emission and excitation spectra of Ca2PO4Cl: Eu3+/Ce3+ phosphors can be ascribed to the electronic transitions within 4f configurations of rare earth ions. The excitation peaks for Ca2PO4Cl: Eu3+ is in n-UV range. The obtained results suggest that these phosphors may be favorable for lamp industry.
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20

Rao, Ch Atchyutha, N. Bujji Babu, and K. V. R. Murthy. "Synthesis and Optical Properties of Ce3+ Doped Gadolinium Silicate Phosphors." European Journal of Theoretical and Applied Sciences 1, no. 4 (July 6, 2023): 1288–95. http://dx.doi.org/10.59324/ejtas.2023.1(4).118.

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The present paper reports the optical properties of rare-earth-doped Gadolinium Silicate Phosphors. The Cerium Oxide (Ce3+) was used as rare-earth-doped. The phosphor is prepared by using the Solid-state reaction method (conventional method) heated at 1200oC for 2 hrs. The received cakes are grounded for 30 minutes each. The phosphors are prepared and the received powder is subjected to PL, XRD, SEM, and EDAX analysis. The following section discusses and the experimental results are mentioned in these phosphors. The present Phosphor can act as a host for blue light emission in many display devices and technological applications.
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21

Uheda, Kyota. "Application of Nitride and Oxynitride Compounds to Various Phosphors for White LED." Key Engineering Materials 403 (December 2008): 15–18. http://dx.doi.org/10.4028/www.scientific.net/kem.403.15.

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Multiternary nitride and oxynitride compounds doped with rare earth ions, such as Eu2+ and Ce3+ have been enthusiastically applied as various phosphors to white LED. New red and green phosphors, CaAlSiN3:Eu and Ba3Si6O12N2:Eu, have been successfully synthesized, recently. The red phosphor has intense emission around 650 nm under two different irradiations at 405 and 455 nm from blue- and near UV-LED chips, respectively; while strong emission is observed around 520 nm from the green phosphor. Both phosphors also show small thermal quenching over the temperatures up to 150 °C. In addition, both LaSi3N5:Ce and La3Si8O4N11:Ce in lanthanum silicon nitride and oxynitride were examined as candidates for a blue phosphor in white LED with near UV-LED chip.
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22

Ye, Shenrui, Yukun Li, Ming Qiang, Wenhui Lou, Bo Dai, Hui Lin, Zhaoxia Han, Ruijin Hong, and Dawei Zhang. "Color Tunable Composite Phosphor Ceramics Based on SrAlSiN3:Eu2+/Lu3Al5O12:Ce3+ for High-Power and High-Color-Rendering-Index White LEDs/LDs Lighting." Materials 16, no. 17 (August 31, 2023): 6007. http://dx.doi.org/10.3390/ma16176007.

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Lu3Al5O12:Ce3+ phosphor ceramics were fabricated by vacuum sintering. On this basis, a bi-layer composite phosphor was prepared by low-temperature sintering to cover the phosphor ceramics with a layer of SrAlSiN3:Eu2+-phosphor-in-glass (PiG). The optical, thermal, and colorimetric properties of LuAG:Ce3+ phosphor ceramics, SrAlSiN3:Eu2+ phosphors and SrAlSiN3:Eu2+-PiG were studied individually. Combining the bi-layer composite phosphors with the blue LED chip, it is found that the spectrum can be adjusted by varying the doping concentration of SrAlSiN3:Eu2+-PiG and the thickness of Lu3Al5O12:Ce3+ phosphor ceramics. The maximal color rendering index value of the white LED is 86, and the R9 is 61. Under the excitation of a laser diode, the maximum phosphor conversion efficacy of the bi-layer composite phosphors is 120 lm/W, the Ra is 83, and the correlated color temperature is 4534 K. These results show that the bi-layer composite phosphor ceramic is a candidate material to achieve high color rendering index for high brightness lighting.
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23

Qian, Xian Hua, Da Feng Zhang, and Xi Peng Pu. "Combustion Synthesis and Luminescence Properties of NaY1-XTbX(WO4)2 Novel Green Phosphors." Advanced Materials Research 295-297 (July 2011): 861–64. http://dx.doi.org/10.4028/www.scientific.net/amr.295-297.861.

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NaY1-xTbx(WO4)2 green phosphors have been synthesized by a facile combustion method. The structure, morphology and luminescence properties of as-synthesized phosphors were characterized via X-ray powder diffraction (XRD), photoluminescence spectra, and decay curve. The XRD results indicate that as-synthesized phosphors exhibit sheelite-type structure without any impurity phase. The as-obtained phosphors emit strong green light centered at 546 nm under ultraviolet light excitation. The lifetimes are about 0.57 ms. The excellent luminescence properties make it a new promising green phosphor for fluorescent lamps application.
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24

Shablinskii, Andrey P., Alexey V. Povolotskiy, Artem A. Yuriev, Yaroslav P. Biryukov, Rimma S. Bubnova, Margarita S. Avdontceva, Svetlana Yu Janson, and Stanislav K. Filatov. "Novel Red-Emitting BaBi2B4O10:Eu3+ Phosphors: Synthesis, Crystal Structure and Luminescence." Symmetry 15, no. 4 (April 14, 2023): 918. http://dx.doi.org/10.3390/sym15040918.

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The novel red-emitting BaBi2-xEuxB4O10 (x = 0.05, 0.1, 0.2, 0.25, 0.3, 0.4, 0.5, 0.6) phosphors were obtained by a crystallization from a glass. Distribution of the Eu3+ ions over cation sites were refined for x = 0.1, 0.3 and 0.4 from single-crystal X-ray diffraction data. Emission and excitation spectra of the Eu3+-doped BaBi2B4O10 phosphors were investigated for the first time, where it was shown that characteristic lines are attributed to the intraconfigurational 4f-4f transitions. The optimal concentration for the BaBi2-xEuxB4O10 phosphors is x = 0.4, after which a luminescence intensity decreases. The CIE chromaticity coordinates for the BaBi2B4O10:Eu3+ (x = 0.4) phosphor (0.65, 0.35) are close to the NTSC standard values (0.67, 0.33) for commercial red phosphor. The obtained results show that the BaBi2B4O10:Eu3+ phosphors are promising candidates for solid state lighting application.
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25

Zachau, M., and A. Konrad. "Nanomaterials for Lighting." Solid State Phenomena 99-100 (July 2004): 13–18. http://dx.doi.org/10.4028/www.scientific.net/ssp.99-100.13.

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Luminescent and non-luminescent nano materials are used today in a variety of lighting applications. One example is the thin layer of densely packed nano alumina between glass and phosphor in fluorescent lamps that serves to increase the efficiency, to improve the maintenance and to reduce the mercury consumption of the lamps. Further, non-luminescent nano materials may be used to form a thin conformal coating around phosphor particles that protects the phosphor particles and improves the efficiency and maintenance of fluorescent lamps. Luminescent nano materials have been the subject of extensive research in the last 15 years. For particle sizes below 20 nm, the optical properties of nano phosphors change, e.g. the exciton energy increases and perhaps even more important, scattering decreases. We have synthesized nano Y2O3:Eu of particle sizes down to 10 nm, derived its optical properties, and investigated its use in Hg-free fluorescent lamps based on the Xe-excimer discharge. The possibility of using nano phosphors, e.g. semiconducting nano phosphors as CdSe or rare-earth doped phosphors as LaPO4:RE in LEDs, will be discussed.
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26

Ho, Wen-Jeng, Jheng-Jie Liu, Zong-Xian Lin, and Hung-Pin Shiao. "Enhancing Photovoltaic Performance of GaAs Single-Junction Solar Cells by Applying a Spectral Conversion Layer Containing Eu-Doped and Yb/Er-Doped Phosphors." Nanomaterials 9, no. 11 (October 25, 2019): 1518. http://dx.doi.org/10.3390/nano9111518.

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In this study, we examined efforts to increase the photovoltaic performance of GaAs single-junction solar cells using spectral conversion layers, respectively, composed of europium-doped (Eu-doped) phosphors, ytterbium/erbium-doped (Yb/Er-doped) phosphors, and a combination of Eu-doped and Yb/Er-doped phosphors. Spin-on film deposition was used to apply the conversion layers, all of which had a total phosphor concentration of 3 wt%. The chemical compositions of the phosphors were examined by energy-dispersive X-ray spectroscopy. The fluorescence emissions of the phosphors were confirmed by using photoluminescence measurements. Under laser diode excitation at 405 nm, we observed green luminescent downshift (LDS) emissions by Eu-doped phosphors at wavelengths of 479 nm to 557 nm, and under excitation at 980 nm, we observed red up-conversion (UC) emissions by Yb/Er-doped phosphors at wavelengths of 647 nm to 672 nm. The spectral conversion layers were characterized in terms of optical reflectance, external quantum efficiency, and photovoltaic current and voltage under AM 1.5 G simulations. The conversion efficiency of the cell combining Eu-doped and Yb/Er-doped phosphors (23.84%) exceeded that of the cell coated with Yb/Er-doped phosphors (23.72%), the cell coated with Eu-doped phosphors (23.19%), and the cell coated without phosphors (22.91%).
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27

Yu, Sheng Fei. "Maleic Anhydride Coating for Strontium Aluminate-Based Phosphors." Advanced Materials Research 79-82 (August 2009): 807–10. http://dx.doi.org/10.4028/www.scientific.net/amr.79-82.807.

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Strontium aluminate-based phosphors SrAl2O4:Eu2+,Dy3+ (SAO-ED) are coated directly by the interfacial coordination chemistry method with maleic anhydride to prevent their hydrolysis in moist air. SEM, XPS, TG and DSC methods are used to characterize the coating. The results showed SAO-ED phosphors coordinated with maleic anhydride by the coordination bond and . The introduction of maleic anhydride doesn’t change the excitation and emission spectra of SAO-ED phosphors, which is proved by the photoluminescence measurement. The SAO-ED phosphor coated with 30 wt. % maleic anhydride has higher water-resistance at the cost of a minor loss of persistent phosphorescence than that of SAO-ED phosphor.
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28

Song, Guo Hua, Bin Jiang, Jian Wen Miao, and Bang Dong Ding. "Preparation of Y4MgSi3O13:Tb3+,Ce3+ Green Emitting Phosphor for White Light Emitting Diodes and its Luminescence Study." Advanced Materials Research 415-417 (December 2011): 1333–39. http://dx.doi.org/10.4028/www.scientific.net/amr.415-417.1333.

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The Y4MgSi3O13:Tb3+,Ce3+green phosphors are synthesized by sol-gel method, the preparation temperature, reduction atmosphere and luminescence characteristics of Y4MgSi3O13doped with single Ce3+ions and Ce3+,Tb3+ions have been studied. The excitation and emission spectra of phosphors is determined by fluorescence spectrophotometer. The results show that: luminous intensity of Y4MgSi3O13:Tb3+phosphors increased after doped with Ce3+ions and the optimal doping concentration of Ce3+is 0.04. Y3.94MgSi3O13: 0.02Tb3+,0.04Ce3+green phosphor has the best luminescence characteristics under reduction atmosphere(H2:N2=1:3) at 1000°C, the phosphor gives intense green emission at 550nm originating from the5D4→7F5transition of Tb3+ions.
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29

Loryuenyong, Vorrada, and Achanai Buasri. "Preparation of Luminescent Glass Aggregates from Soda-Lime Waste Glass." International Journal of Photoenergy 2021 (November 8, 2021): 1–6. http://dx.doi.org/10.1155/2021/5951258.

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This research studied the preparation of luminescent glass aggregates prepared from soda-lime waste glass and strontium aluminate-based phosphors. The properties of the samples were determined by means of X-ray diffraction (XRD) technique, scanning electron microscopy (SEM), Archimedes’ method, and photoluminescence (PL) spectroscopy. It was found that the pore characteristics, density, and formation of crystallite phases in the glassy matrix depended on the phosphor content. The addition of fine phosphor powder tended to inhibit the glass crystallization and to reduce the apparent porosity of the aggregates. In general, the disadvantage of phosphors is their luminescent degradation under thermal attacks, which limits their use in applications involving high-temperature annealing. The phosphors, however, still had good luminescent properties and long-term stability with the sintering temperature as high as 750°C. The results indicated that the phosphors could be composited with glasses at high processing temperatures, enabling their widespread application.
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30

Shea, Lauren E. "Low-Voltage Cathodoluminescent Phosphors." Electrochemical Society Interface 7, no. 2 (June 1, 1998): 24–27. http://dx.doi.org/10.1149/2.f05982if.

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Phosphors have been used for the display of information since the invention of the cathode-ray tube (CRT) by Karl Ferdinand Braun in 1897. With the development of color television, an effort spanning approximately 30 years, came the most significant advances in phosphor technology. The most noteworthy was the shift to the all-sulfide system, and discovery of the red, rare-earth oxysulfide phosphors.
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31

Lu, Juan, Chia-Ching Su, Cheng-Shong Hong, Guoxiang Peng, and Cheng-Fu Yang. "Investigations of Photoluminescence Properties of CaxMg2-xSi2O6:yEu2+ (x = 0.5–1.25, y = 0.015–0.035) Phosphors." Materials 16, no. 5 (March 1, 2023): 2032. http://dx.doi.org/10.3390/ma16052032.

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Previously, there were almost no relevant studies on developing the optimal CaxMg2-xSi2O6:yEu2+ phosphor composition for its finest optical properties. This study employs two steps to determine the optimal composition for CaxMg2-xSi2O6:yEu2+ phosphors. First, CaMgSi2O6:yEu2+ (y = 0.015, 0.020, 0.025, 0.030, 0.035) was used as the primary composition of specimens synthesised in a reducing atmosphere of 95% N2 + 5% H2 to investigate the effect of Eu2+ ions on the photoluminescence properties of each variant. The emission intensities of the entire photoluminescence excitation (PLE) and photoluminescence (PL) emission spectra of the CaMgSi2O6:yEu2+ phosphors initially increased as the concentration of the Eu2+ ions increased, peaking at y = 0.025. The cause of the variations across the entire PLE and PL spectra of all five CaMgSi2O6:yEu2+ phosphors was investigated. Because the CaMgSi2O6:0.025Eu2+ phosphor had the highest PLE and PL emission intensities, in the next step, CaxMg2-xSi2O6:0.025Eu2+ (x = 0.5, 0.75, 1.0, 1.25) was used as the primary composition to investigate the effect on the photoluminescence properties when the CaO content varied. We also show that the Ca content has an apparent effect on the photoluminescence properties of CaxMg2-xSi2O6:0.025Eu2+ phosphors, and the optimal phosphor composition is Ca0.75Mg1.25Si2O6:0.025Eu2+ because it has the largest PLE and PL values. X-ray diffraction (XRD) analyses of CaxMg2-xSi2O6:0.025Eu2+ phosphors were performed to identify the factors responsible for this outcome.
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32

Lin, Heng, Bi Sang Chen, Yuan Zhi Chen, Guo Liang Chen, Hua Lin, Zi Shan Zheng, Zhong Hui Chen, Hong Xu Guo, Lin Feng Huang, and Zhi Chen. "Encapsulation of Polyethylene for Strontium Aluminate Phosphors to Enhance its Water Resistance." Advanced Materials Research 393-395 (November 2011): 84–87. http://dx.doi.org/10.4028/www.scientific.net/amr.393-395.84.

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Phosphors of SrAl2O4:Eu2+, Dy3+ were encapsulated with polyethylene plastic film by a physical technology. Water resistance measurements, Fourier transform infrared spectroscopy (FT-IR), thermogravimetric (TG) analysis, and photoluminescence (PL) spectrophotometry were used to characterize the phosphors Results showed that the encapsulated layer was a thin film with an encapsulation amount of 4.0 wt%, and encapsulation can effectively improve the water-resistance for the phosphor without any destroy of crystal structure of phosphors.
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33

Hansen, L. E., E. R. Westphal, A. L. Kastengren, and C. Winters. "Energy dispersive x-ray diffraction of luminescent powders: A complement to visible phosphor thermometry." Journal of Applied Physics 132, no. 6 (August 14, 2022): 065105. http://dx.doi.org/10.1063/5.0101649.

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Energy-dispersive x-ray diffraction of thermographic phosphors has been explored as a complementary temperature diagnostic to visible phosphor thermometry in environments where the temperature-dependent optical luminescence of the phosphors is occluded. Powder phosphor samples were heated from ambient to 300 [Formula: see text]C in incremental steps and probed with polychromatic synchrotron x rays; scattered photons were collected at a fixed diffraction angle of [Formula: see text]. Crystal structure, lattice parameters, and coefficients of thermal expansion were calculated from the diffraction data. Of the several phosphors surveyed, YAG:Dy, ZnO:Ga, and GOS:Tb were found to be excellent candidates for diffraction thermometry due to their strong, distinct diffraction peaks that shift in a repeatable and linear manner with temperature.
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34

Sun, Jia Yue, Jin Li Lai, Yi Ning Sun, Zhi Guo Xia, and Hai Yan Du. "Luminescence Properties of Ce3+ and Tb3+ Doped Strontium Pyroborate Phosphors." Advanced Materials Research 502 (April 2012): 140–43. http://dx.doi.org/10.4028/www.scientific.net/amr.502.140.

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Ce3+ and Tb3+ co-doped Strontium Pyroborate phosphors were synthesized by the solid-state method. The luminescent properties of phosphors were investigated by using the photoluminescence emission and excitation spectra. Under the excitation of near ultraviolet (n-UV) light, Ce3+ and Tb3+ co-doped Strontium Pyroborate phosphors exhibited blue emission corresponding to the f-d transition of Ce3+ ions and green emission bands corresponding to the f-f transition of Tb3+ ions, respectively. In the Ce3+ and Tb3+ co-activated samples the Ce3+ ions strongly sensitize the luminescence of the Tb ions. The Ce3+ and Tb3+ co-doped Strontium Pyroborate phosphor could be considered as one of double emission phosphor for n-UV excited white light emitting diodes.
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35

Li, Shan, Shu-Yu Zhao, Tian-Nan Ye, Xue-Yan Wu, Kai-Xue Wang, Xiao Wei, and Jie-Sheng Chen. "MgAl2O4:Mn2+ Red-Emitting Phosphor: Influence of MgF2 Flux on the Microstructure and Luminescence Properties." Journal of Composites and Biodegradable Polymers 5, no. 1 (February 27, 2017): 17–25. http://dx.doi.org/10.12974/2311-8717.2017.05.01.3.

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A serial of Mn ions doped MgAl2O4 phosphors, exhibiting only red light centred at 650 nm, have been prepared by a solid state reaction (SSR) with and without MgF2 flux. These phosphors have been characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and electron paramagnetic resonance (EPR) measurements. EPR result demonstrates that Mn ions exist as +2 valence. The emission intensity of the phosphors varies with Mn2+ concentration. The addition of MgF2 flux to the reactants enhances the luminescence properties through elevating the crystallinity, regulating the morphology and particle size of the MgAl2O4:Mn2+ phosphor. The phosphor MgAl2O4:0.10%Mn2+ with 12 wt% MgF2 flux shows the best emission performance.
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36

Gao, Yuhan, Lei Feng, Linglin Wang, Jun Zheng, Feiyao Ren, Siyu Liu, Zhanglei Ning, et al. "Novel Mn4+-Activated K2Nb1−xMoxF7 (0 ≤ x ≤ 0.15) Solid Solution Red Phosphors with Superior Moisture Resistance and Good Thermal Stability." Molecules 28, no. 11 (June 5, 2023): 4566. http://dx.doi.org/10.3390/molecules28114566.

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Nowadays, Mn4+-activated fluoride red phosphors with excellent luminescence properties have triggered tremendous attentions for enhancing the performance of white light-emitting diodes (WLEDs). Nonetheless, the poor moisture resistance of these phosphors impedes their commercialization. Herein, we proposed the dual strategies of “solid solution design” and “charge compensation” to design K2Nb1−xMoxF7 novel fluoride solid solution system, and synthesized the Mn4+-activated K2Nb1−xMoxF7 (0 ≤ x ≤ 0.15, x represents the mol % of Mo6+ in the initial solution) red phosphors via co-precipitation method. The doping of Mo6+ not only significantly improve the moisture resistance of the K2NbF7: Mn4+ phosphor without any passivation and surface coating, but also effectively enhance the luminescence properties and thermal stability. In particular, the obtained K2Nb1−xMoxF7: Mn4+ (x = 0.05) phosphor possesses the quantum yield of 47.22% and retains 69.95% of its initial emission intensity at 353 K. Notably, the normalized intensity of the red emission peak (627 nm) for the K2Nb1−xMoxF7: Mn4+ (x = 0.05) phosphor is 86.37% of its initial intensity after immersion for 1440 min, prominently higher than that of the K2NbF7: Mn4+ phosphor. Moreover, a high-performance WLED with high CRI of 88 and low CCT of 3979 K is fabricated by combining blue chip (InGaN), yellow phosphor (Y3Al5O12: Ce3+) and the K2Nb1−xMoxF7: Mn4+ (x = 0.05) red phosphor. Our findings convincingly demonstrate that the K2Nb1−xMoxF7: Mn4+ phosphors have a good practical application in WLEDs.
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37

Chen, Hao-Long, Hung-Rung Shih, Sean Wu, and Yee-Shin Chang. "Effects of Bi3+ Ion-Doped on the Microstructure and Photoluminescence of La0.97Pr0.03VO4 Phosphor." Advances in Technology Innovation 6, no. 3 (May 19, 2021): 191–98. http://dx.doi.org/10.46604/aiti.2021.5635.

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The objective of this paper is to enhance the emission intensity of La0.97Pr0.03VO4 single-phased white light emitting phosphor. The Bi3+ ion-doped La0.97Pr0.03VO4 single-phased white light emitting phosphors are synthesized using a sol-gel method. The structure and photoluminescence properties of (La0.97-yBiy)Pr0.03VO4 (y = 0-0.05) phosphor are also examined. The XRD results show that the structure of La0.97Pr0.03VO4 phosphors with different concentrations of Bi3+ ion doping keeps the monoclinic structure. The SEM results show that the phosphor particles become smoother when the Bi3+ ion is doped. The excitation band for La0.97Pr0.03VO4 phosphor exhibits a blue shift from 320 nm to 308 nm as the Bi3+ ion contents are increased. The maximum emission intensity is achieved for a Bi3+ ion content of 0.5 mol%, which is about 30% greater than that with no Bi3+ ion doped. The CIE chromaticity coordinates are all located in the near white light region for different Bi3+ ion-doped La0.97Pr0.03VO4 phosphors.
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38

Wang, Haifeng, Jianwei Lu, Ruoxuan Wang, Yungu Dong, and Linfeng Ding. "Synthesis and Characterization of the CaTiO3:Eu3+ Red Phosphor by an Optimized Microwave-Assisted Sintering Process." Materials 13, no. 4 (February 15, 2020): 874. http://dx.doi.org/10.3390/ma13040874.

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The synthesis process has a significant influence on the properties of Ca1-xTiO3:Eu3+x phosphors; thus, an optimized process will lead to a better performance of the Ca1-xTiO3:Eu3+x phosphors. In this work, the feasibility of synthesizing the Ca1-xTiO3:Eu3+x phosphor with a good luminescent performance by combining the chemical co-precipitation method and microwave-assisted sintering was studied. The precursor of Ca1-xTiO3:Eu3+x phosphors were prepared by the chemical co-precipitation method. To find an optimized process, we applied both of the traditional (furnace) sintering and the microwave-assisted sintering to synthesize the Ca1-xTiO3:Eu3+x phosphors. We found out that a sintering power of 528 W for 50 min (temperature around 950 °C) by a microwave oven resulted in similar emission intensity results compared to traditional furnace sintering at 900 °C for 2.5 h. The synthesized Ca1-xTiO3:Eu3+x phosphors has an emission peak at 617 nm (5D0→7F2), which corresponds to the red light band. This new synthesized method is an energy efficient, time saving, and environmentally friendly means for the preparation of Ca1-xTiO3:Eu3+x red phosphor with good luminescent performance.
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39

Park, Kyeongsoon, S. Y. Gwon, and S. H. Kim. "Crystal Structure–Photoluminescence Correlations in Ce3+-Doped Ca2ZnSi2O7phosphors." ECS Meeting Abstracts MA2023-02, no. 50 (December 22, 2023): 2468. http://dx.doi.org/10.1149/ma2023-02502468mtgabs.

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In this work, Ce3+-doped Ca2-x ZnSi2O7:xCe3+ phosphors were prepared by the solid-state reaction in air. The crystal structure and photoluminescence properties of the prepared phosphors were investigated. All the prepared samples formed the tetragonal crystal structure. XRD Rietveld refinement was performed to retrieve a detailed crystal structure of the Ca2-x ZnSi2O7:xCe3+ phosphors. The lattice parameters a and c increased with increasing Ce3+concentration. The lattice parameters a and c of the Ca1.996ZnSi2O7: 0.004Ce3+ phosphor were 7.825 Å and 5.015 Å, respectively. The Ca2-x ZnSi2O7:xCe3+ phosphors showed strong and asymmetric bands covering the 415 to 650 nm range, which were attributed to the transitions of Ce3+ ions from the 5d excited state to the 2F5/2 and 2F7/2 ground states. The emission intensity increased with increasing Ce3+concentration up to x = 0.012. The dipole-dipole interaction was responsible for the concentration quenching. The CIE coordinate (x, y) was located in the blue spectral region. These results indicate that the prepared Ca2-x ZnSi2O7:xCe3+ phosphors can serve as an efficient blue phosphor in the white light emitting diodes.
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40

Yin, Peng, Can Xue, and Bin Guo. "Surface modification model of long afterglow phosphors by saturated fatty acid based Al-Zr coupling agent." Pigment & Resin Technology 45, no. 5 (September 5, 2016): 330–34. http://dx.doi.org/10.1108/prt-07-2015-0060.

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Purpose The purpose of this paper is to study the influence of different carbon chain lengths in coupling agents on the water resistance and compatibility of modified long afterglow phosphors and attempt to obtain their modification model and mechanism. Design/methodology/approach Three saturated-fatty-acid (caprylic, lauric, stearic acid)-based Al-Zr CAs (coupling agent) was synthesised and applied to modify the long afterglow phosphors SrMgAl4O8:Eu2+,Dy3+. Findings Results show that the coated amount on phosphors decreased from 13.41 to 6.53 per cent with the increased carbon chain length of fatty acid, and the better water resistant and suitability with organic resin can be obtained by lauric-based Al-Zr CA. Originality/value Considering that the decomposition process of modified phosphor was related with the decomposition performance of corresponding coupling agents and original phosphor, a method was first proposed to calculate the coated amount on phosphors by thermogravimetric analyser parameters.
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41

Etafo, Nelson Oshogwue, Carlos Eduardo Rodriguez Garcia, Roberto Constancio Torres Ramírez, Efraín Viesca-Villanueva, and Jose Luis Fraga Almanza. "Blue-Emitting SrLaAlO<sub>4</sub>: Ce Phosphors Obtained by Combustion Synthesis." Materials Science Forum 1112 (February 8, 2024): 131–37. http://dx.doi.org/10.4028/p-5a41hx.

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In this study, a simple combustion synthesis was utilized to obtain the SrLaAlO4 (SLAO) host sample and SrLaAlO4: Ce (SLAO:Ce) phosphors with different Ce concentrations (1.0, 3.0, 5.0 and 7.0 mol.%). Also, the as-synthesized samples were subjected to a post-annealing treatment at 1200 °C in air. X-ray diffraction (XRD) patterns for the SLAO and SLAO:Ce phosphors correspond to pure tetragonal phase (JCPDS No 24-1125). The photoluminescence spectra of the SLAO:Ce phosphors (under 254 nm excitation) showed a blue emission peak at 470 nm attributed to the 5d → 4f Ce3+ transition. The SLAO:Ce phosphors doped with 1 mol.% of Ce showed the highest emission and quenching of photoluminescence was produced when the Ce dopant concentration increases (3.0-7.0 mol.%). The CCT and color purity are in the range of 6456 -8276 K and 49.1 -55.9 % respectively. Due to its strong blue emission, the SLAO:Ce phosphor could be a good candidate for UV phosphor converted LED or for solid state lighting applications.
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42

Segal, Ohad, Avner Shultzman, Yaniv Kurman, and Ido Kaminer. "Optimizing the spontaneous-emission of far-UVC phosphors." Applied Physics Letters 120, no. 23 (June 6, 2022): 231902. http://dx.doi.org/10.1063/5.0092109.

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Far-UVC light can enable virus-deactivation while remaining harmless to human tissues. This triggered great efforts to create far-UVC light sources with sufficient emission power and efficiency. However, current sources, such as mercury lamps, KrCl excimer lamps, and LEDs, are made from hazardous chemicals or are limited by low efficiency. Consequently, an alternative approach for reaching the far-UVC is now receiving renewed interest: using phosphors for converting higher frequencies to the desired range of far-UVC. However, this concept is limited by the phosphor's conversion efficiency. In this paper, we propose to utilize principles of nanophotonics to create far-UVC sources. Specifically, we design a phosphor-dielectric multilayer that increases the efficiency of far-UVC light conversion and controls the intrinsic emission properties, including the angular spectrum and emission rate, by shaping the local density of photonic states. To exemplify our approach, we design an aperiodic multilayer nanostructure made of the phosphor material YPO4:Pr3+, showing an increase in light extraction by a factor of 3 compared to naïve bulk structures. Our approach can be applied to any phosphor material and any emitter geometry, opening avenues for engineering nanophotonic light sources in the far-UVC and other spectral regimes.
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43

Rodionova, Anna V., Victor I. Kuular, Tamara S. Minakova, Parviz Sh Ustabaev, and Vadim V. Bakhmetyev. "Acid-Base and Luminescent Properties of Gd2O2S: Tb Luminescent Phosphors Synthesized in a Reducing Atmosphere." Key Engineering Materials 854 (July 2020): 57–63. http://dx.doi.org/10.4028/www.scientific.net/kem.854.57.

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Gd2O2S:Tb phosphors with different terbium content are prepared in a reducing atmosphere at various synthesis conditions. The effect of an activator and Na4P2O7 flux concentrations upon photo-and X-ray induced luminescence of the synthesized samples as well as on their acid-base properties and morphology is studied. The addition of Na4P2O7 flux into the charge mixture leads to a significant increase of the phosphor particle size. A positive correlation is found between the particle size and pH value of the phosphor aqueous slurry. The photoluminescence intensity is found to mostly depend on the activator concentration, while X-ray luminescence intensity primarily depends on the particle size and crystal structure perfectness of the phosphor matrix. Charge mixture compositions and synthesis conditions providing Gd2O2S:Tb phosphors with the highest photo-and X-ray luminescence intensity are determined. A Gd2O2S:Tb phosphor with X-ray luminescence intensity exceeding the values for the commercial phosphor KEP-45 of a similar composition is developed. The obtained phosphors can be used for the manufacture of intensifying screens applied in industrial X-ray flaw detection.
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44

Atchyutha Rao, Ch, and K. V. R. Murthy. "SYNTHESIS, CHARACTERIZATION AND PHOTOLUMINESCENCE PROPERTIES OF EU3+DOPED CALCIUM SILICATE PHOSPHOR BY CONVENTIONAL SOLID STATE REACTION METHOD." International Journal of Advanced Research 8, no. 12 (December 31, 2020): 762–69. http://dx.doi.org/10.21474/ijar01/12209.

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Calcium Silicate phosphor acquires a higher luminous efficiency when it is doped with rare earth activated ions. Silicate phosphors are used for a fluorescent, a cathode-ray tube, a luminous body, a vacuum ultraviolet excitation light emitting element etc. The silicates of calcium are known for their thermal stability, high temperature strength, low thermal expansion, cheep residence and chemical inertness. The present paper reports on the synthesis, characterization and photoluminescence properties of Eu3+ doped calcium silicate phosphor prepared by conventional solid state reaction method heating at 12000C for 3 hrs. The received cakes are grounded for 30 minutes each. The phosphors are prepared and the received powder is subjected to PL, XRD, SEM, EDAX and CIE analysis. The following section discusses and the experimental results are mentioned in these phosphors. The present Phosphor can act as a host for red light emission in many display devices and technological applications.
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45

Atchyutha Rao, Ch, and K. V. R. Murthy. "SYNTHESIS, CHARACTERIZATION AND PHOTOLUMINESCENCE PROPERTIES OF EU3+DOPED CALCIUM SILICATE PHOSPHOR BY CONVENTIONAL SOLID STATE REACTION METHOD." International Journal of Advanced Research 8, no. 12 (December 31, 2020): 762–69. http://dx.doi.org/10.21474/ijar01/12209.

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Calcium Silicate phosphor acquires a higher luminous efficiency when it is doped with rare earth activated ions. Silicate phosphors are used for a fluorescent, a cathode-ray tube, a luminous body, a vacuum ultraviolet excitation light emitting element etc. The silicates of calcium are known for their thermal stability, high temperature strength, low thermal expansion, cheep residence and chemical inertness. The present paper reports on the synthesis, characterization and photoluminescence properties of Eu3+ doped calcium silicate phosphor prepared by conventional solid state reaction method heating at 12000C for 3 hrs. The received cakes are grounded for 30 minutes each. The phosphors are prepared and the received powder is subjected to PL, XRD, SEM, EDAX and CIE analysis. The following section discusses and the experimental results are mentioned in these phosphors. The present Phosphor can act as a host for red light emission in many display devices and technological applications.
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46

Wang, Jun-Feng, Hao Zu, Chuan-Wen Lin, Shou-Jun Ding, Peng-Yu Shao, and Ye Xia. "Synthesis and Luminescence Properties of SrGd2O4:Eu3+ Red Phosphors." International Journal of Optics 2020 (April 14, 2020): 1–5. http://dx.doi.org/10.1155/2020/3095429.

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As one of the important raw materials for LED products, phosphors play an important role. At present, the spectrum of LED phosphors lacks red light, resulting in poor quality of white LED products and a low color rendering index (Ra <80), which affects lighting effects. To solve this problem, we synthesized the SrGd2O4:Eu3+ red phosphor by a high-temperature solid-phase method. The structure and luminescence properties of SrGd2O4:Eu3+ red phosphors were studied by means of X-ray diffraction (XRD) measurements of their emission and excitation spectra, and their spectra were analyzed. We also studied the Eu3+ doping concentration with the best luminous efficiency and the color coordinate of the SrGd2O4:Eu3+ phosphor. The experimental results show that SrGd2O4:Eu3+ is a new red phosphor material that can be used for near-ultraviolet or blue-light excitation and has good practicability.
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47

Indumathi, K., S. Tamilselvan, A. Duke John David, G. Shakil Muhammed, and G. Annadurai. "Structural and Optical Properties of Dy3+ Doped with an Eulytite Type NaBaBi2(PO4)3 Phosphor for White Light Emitting Diodes." Asian Journal of Chemistry 34, no. 7 (2022): 1869–74. http://dx.doi.org/10.14233/ajchem.2022.23766.

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A series of NaBaBi(2-x)(PO4)3:xDy3+ eulytite type phosphors with varying doping concentrations were synthesized using a conventional solid-state reaction. The crystalline nature and phase formation of the phosphor were confirmed by the PXRD technique. FESEM was used to examine the surface morphology. UV-DRS measurements were used to quantify the band gap of the host and Dy3+ ion doped phosphors. The phosphors’ photoluminescence properties were thoroughly investigated. According to the excitation spectra, these phosphors show a strong absorption band in the near-ultraviolet (NUV) region, extending from 250 to 450 nm. Under the excitation of 352 nm, the peaks of the emission spectra of Dy3+ ions are located at 485 nm (blue), 575 nm (yellow) and 666 nm (red), corresponding to the magnetic dipole 4F9/2→6H15/2 transition, the electric dipole 4F9/2→6H13/2 transition and the 4F9/2→6H11/2 transition. The optimal concentration of Dy3+ doped phosphor is x = 0.075 and the major concentration quenching mechanism is accomplished by energy transfer between the nearest-neighbour ions. The critical transfer distance (Rc) is estimated to be about 19.01. The Commission International deI’Eclairage (CIE) of NaBaBi1.925(PO4)3:0.075Dy3+ phosphor was calculated to be (x = 0.341 and y = 0.374), which was very close to the “ideal white” (x = 0.33, y = 0.33). Present findings suggest that the phosphor might be a viable option for producing a white-light-emitting phosphor under NUV activation.
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48

Wang, Xin, Rui Rui Cui, and Chao Yong Deng. "Photoluminescence Properties of CaBi4Ti4O15:Dy3+ for White Light-Emitting Diodes." Advanced Materials Research 1053 (October 2014): 8–14. http://dx.doi.org/10.4028/www.scientific.net/amr.1053.8.

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This paper studied the structural and optical properties of Dy3+-doped CaBi4Ti4O15 phosphors synthesized by a traditional solid state method. The phosphors have been characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM) and fluorescence measurements. Upon 450 nm blue light excitation, the phosphors show yellow emission centered at 574 nm with the color coordination of (x=0.44, y=0.54). And the phosphors exhibit a tunable white color emission under the near ultraviolet source by adjusting the ratio of Dy3+ appropriately. The optimal composition of Ca0.93Bi4Ti4O15:0.07Dy3+ generates white light with the color chromaticity of (x=0.31, y=0.36), indicating that CaBi4Ti4O15:Dy3+ phosphor would be a potential candidate for white light emitting diodes (LEDs) applications.
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49

Li, Rui Fang, Jun Wei Ye, Jing Hui Wang, Xiao Bin Lu, Yuan Lin, and Gui Ling Ning. "Surface Modification of SrAl2O4:Eu2+, Dy3+ Phosphors Using Silica Encapsulation." Advanced Materials Research 58 (October 2008): 199–204. http://dx.doi.org/10.4028/www.scientific.net/amr.58.199.

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Silica encapsulated phosphors SrAl2O4:Eu2+, Dy3+ have been synthesized by non-homogeneous phase coring method, in which glycerol was firstly used as dispersion medium and hyper-dispersant was introduced as additive. IR, BET and scanning electron microscopy (SEM) demonstrated that a dense layer of silica was formed on the surface of phosphor SrAl2O4:Eu2+, Dy3+. The results showed that the encapsulated phosphors possess good properties in water-resistance, heat-resistance and dispersibility when encapsulation amount reached 8 wt. %. Moreover, the photoluminescence intensity of phosphors SrAl2O4:Eu2+, Dy3+ was improved apparently after surface modification. All results revealed that silica encapsulation would effectively improve alkaline earth aluminates phosphors’ properties and using glycerol as the dispersion medium is helpful to silica encapsulation.
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50

Yan, Shirun. "Negative Thermal Quenching of Photoluminescence: An Evaluation from the Macroscopic Viewpoint." Materials 17, no. 3 (January 25, 2024): 586. http://dx.doi.org/10.3390/ma17030586.

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Negative thermal quenching (NTQ) denotes that the integral emission spectral intensity of a given phosphor increases continuously with increasing temperature up to a certain elevated temperature. NTQ has been the subject of intensive investigations in recent years, and a large number of phosphors are reported to have exhibited NTQ. In this paper, a collection of results in the archival literature about NTQ of specific phosphors is discussed from a macroscopic viewpoint, focusing on the following three aspects: (1) Could the NTQ of a given phosphor be reproducible? (2) Could the associated data for a given phosphor exhibiting NTQ be in line with the law of the conservation of energy? (3) Could the NTQ of a given phosphor be demonstrated in a prototype WLED device? By analyzing typical cases based on common sense, we hope to increase awareness of the issues with papers reporting the NTQ of specific phosphors based on spectral intensity, along with the importance of maintaining stable and consistent measurement conditions in temperature-dependent spectral intensity measurement, which is a prerequisite for the validity of the measurement results.
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