Relevant bibliographies by topics / White Phosphor

Academic literature on the topic 'White Phosphor'

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Published: 6 September 2023

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Journal articles on the topic "White Phosphor"

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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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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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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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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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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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Yao, Qing, Xinyi Pan, Junjie Tian, Zhihang Chen, Hongbin Ji, and Yun Wang. "(Sr, Ca)AlSiN3:Eu2+ Phosphor-Doped YAG:Ce3+ Transparent Ceramics as Novel Green-Light-Emitting Materials for White LEDs." Materials 16, no. 2 (January 11, 2023): 730. http://dx.doi.org/10.3390/ma16020730.

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In this work, based on Y3Al5O12:Ce3+ (YAG:Ce3+) transparent ceramic and (Sr, Ca)AlSiN3:Eu2+ phosphors, novel green-light-emitting materials were systematically studied. YAG:Ce3+ transparent ceramics with different doping-concentrations, from 0% to 1% (Sr, Ca)AlSiN3:Eu2+ phosphors, were fabricated by dry pressing and vacuum sintering. The serial phosphor ceramics had 533 nm green-light emission when excited by 460 nm blue light. The PL, PLE, and chromaticity performances were measured, indicating that more of the green-light component was emitted with the increase in doping concentration. The addition of (Sr, Ca)AlSiN3:Eu2+ phosphor increased the green-light wavelength area and improved the quantum yield (QY) of the YAG:Ce3+ ceramic matrix. The phase composition, microstructure, crystal-field structure and phosphor distribution of (Sr, Ca)AlSiN3:Eu2+ phosphor-doped YAG:Ce3+ transparent ceramics were investigated, to explore the microscopic causes of the spectral changes. Impressively, (Sr, Ca)AlSiN3:Eu2+ phosphors were distributed homogeneously, and the pinning effect of phosphor caused the suppression of grain growth. The novel materials could provide an effective strategy for full-spectrum white lighting and displaying applications in the future.
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Son, Chang Sik, Ho Jung Chang, Kang Hyun Jaekal, Young Chol Chang, and Soo Wohn Lee. "Dependence of Yellow Phosphor on Optical and Electrical Properties of the White Light Emitting Diode Chip." Materials Science Forum 510-511 (March 2006): 106–9. http://dx.doi.org/10.4028/www.scientific.net/msf.510-511.106.

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We prepared the surface mounted white light emitting diode (LED) chips by using yellow phosphors on the blue LED chip. The optical and electrical properties of prepared white LED chips were investigated. The yellow phosphor mixed with transparent epoxy was coated on the prepared LED chip. The optimum mixing conditions with epoxy and yellow phosphor is obtained at the mixing ration of epoxy: yellow phosphor = 97 : 3 wt %. The maximum luminance and light emitting efficiency are above 80,000 cd/m2 and 23.2 lm/W, respectively, at the bias voltage of 2.9 V. There was no distinct change in the luminance strength with changing of the yellow phosphor ratios. The flowing current of the white LED chip is about 30 mA at 2.9 V.
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Zhang, Xiao Qi, Li Min Dong, Xin Cheng Tang, Qin Li, and Zhi Dong Han. "Preparation and Luminescent Properties of Single White Ca2MgSi2O7: Eu3+, Ce3+, Tb3+ Phosphor for WLED." Advanced Materials Research 989-994 (July 2014): 395–98. http://dx.doi.org/10.4028/www.scientific.net/amr.989-994.395.

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Ca2MgSi2O7: Eu3+, Ce3+, Tb3+, a single white Phosphor, was synthesized by the conventional solid-state reaction. The structure, surface morphology and luminescence properties of the prepared samples were investigated to evaluate its potentiality. XRD results confirm the orthorhombic phase of Ca2MgSi2O7: Eu3+, Ce3+, Tb3+ phosphors. The excitation spectra indicates the phosphor can be excited by 393 nm wavelength. The phosphor exhibits blue light at 467 nm, green light at 588 nm, red light at 618 nm. CIE chromaticity diagram indicates that Ca2MgSi2O7: Eu3+, Tb3+, Ce3+ exhibits white light. All properties show that the prepared phosphor is a single white phosphor suitable for near ultraviolet excitation which can be applied to new generation white LED lighting.
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Dutta, Dimple P., and A. K. Tyagi. "Inorganic Phosphor Materials for Solid State White Light Generation." Solid State Phenomena 155 (May 2009): 113–43. http://dx.doi.org/10.4028/www.scientific.net/ssp.155.113.

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Solid-state lighting (SSL) is emerging as a highly competent field and a possible alternative to existing lighting technologies. Development of a suitable phosphor is an important aspect of SSL. The aim of this review is to summarize status of Inorganic Phosphors towards SSL applications. Various examples have been taken from oxide, fluoride, nitride, sulfide and phosphate based host lattices. The important concepts like CIE coordinates and Color Correlated Temperature (CCT) will also be discussed. The sections encompasses of red, blue and green light emitting phosphors. The white light emitting phosphors will also be discussed in details.
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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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Dissertations / Theses on the topic "White Phosphor"

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Al-Waisawy, Sara S. "Investigation of Color Phosphors for Laser-Driven White Lighting." Ohio University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1417065501.

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Guricová, Patrícia. "Možnosti přípravy bíle emitujícího elektroluminiscenčního panelu." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2019. http://www.nusl.cz/ntk/nusl-401921.

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The aim of this work is to prepare white emitting electroluminescent device using printing techniques. Preparation options are discussed in order to minimise reabsorption in the phosphor layer and thus increase the overall radiation intensity. Model devices were prepared, the active layer of phosphor printed in a pattern of stripes and circles. The impact of the applied voltage and frequency was studied on these devices. It has been shown that, in terms of white emission, it is better to use the patterns compared to the phosphor mixture. The ratios of emission intensities of both phosphors are more even, therefor closer to the white light. The output of this work is model designed to determine the necessary frequency area for obtaining the white emission of ACEL device.
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Little, Matthew Michael. "Feasibility of manipulating correlated color temperatures with a phosphor converted high-powered light emitting diode white light source." DigitalCommons@CalPoly, 2010. https://digitalcommons.calpoly.edu/theses/332.

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In this thesis we examine the feasibility of developing a white light source capable of producing colors between 2500 and 7500 Kelvin on the black-body radiator spectrum by simply adjusting amperage to a blue and ultraviolet (UV) light emitting diode (LED). The purpose of a lighting source of this nature is to better replicate daylight inside a building at a given time of day. This study analyzes the proposed light source using a 385 nm UV LED, a 457 nm blue LED, a 479 nm blue LED, a 562 nm peak cerium doped yttrium aluminum garnet (YAG:Ce) phosphor, and a 647 nm peak selenium doped zinc sulfide (ZnS:Se) phosphor. Our approach to this study initially examined optical performance of yellow-emitting phosphor (YAG:Ce) positioned at specific distances above a blue LED using polydimethylsiloxane (PDMS) as a substrate. An understanding of how phosphor concentration within the PDMS, the thickness of the PDMS, and how substrate distance from the LED die affected light intensity and color values (determined quantitatively by utilizing the 1931 CIE 2° Standard Observer) enabled equations to be developed for various lens designs to efficiently produce white light using a 457 nm peak wavelength LED. The combination of two luminescent sources (457 nm LED and YAG:Ce) provided a linear trend on the 1931 CIE diagram which required a red illumination source to obtain Kelvin values from 2500 to 7500. Red-emitting phosphor (ZnS:Se), selected to compliment the system, was dispersed with YAG:Ce throughout PDMS where they were stimulated with a blue LED thereby enabling all desired Kelvin values with differing concentration lenses. Stimulating ZnS:Se with the addition of a UV LED did not provide the ability to change the color value of the set up to the degree required. Many other factors resulted in the decision to remove the UV LED contribution from the multi-Kelvin light source design. The final design incorporated a combination of ZnS:Se and YAG:Ce stimulated with a blue LED to obtain a 2500 Kelvin value. A separate blue LED provides the means to obtain 7500 Kelvin light and the other color values in between, with a linear approximation, by adjusting the amperages of both LEDs. In addition to investigating the feasibility of obtaining the Kelvin values from 2500 to 7500, this thesis also examined the problem of ZnS:Se’s inability to cure in PDMS and a method to create a lens shape to provide equal color values at all points above a phosphor converted LED source. ZnS:Se was found to be curable in PDMS if first coated with a low viscosity silicon oil prior to dispersion within PDMS. The lens configuration consists of phosphors equally distributed in PDMS and cured in the shape of a Gaussian distribution unique to multiple factors in LED-based white light design.
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Nekrasova, Y. A., V. A. Aseev, N. V. Nikonorov, E. B. Kolobkova, O. A. Usov, and A. V. Nashchekin. "Red Emitting Phosphors Doped with Mn and Eu Ions for pc-WLEDs." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35375.

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A new red emitting phosphors based on oxyfluoride glass and glassceramics doped with europium and manganese ions were synthesized and their optical properties and structure were studied. The transparent ceramic matrices for phosphors were selected because they overcome traditional powder phosphors due to high chemical and thermal stability and low temperature sensitivity. The fluoride based red emitting phosphors combined with green one and blue emitting chip used to fabricate phosphor converted white LEDs with warm color temperature and improved color rendering indexes. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/35375
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Dreyfuss, Sébastien. "Utilisation de phosphore blanc et d'aminophosphines pour la formation de nanocristaux d'InP." Thesis, Toulouse 3, 2017. http://www.theses.fr/2017TOU30100/document.

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Ce travail de thèse porte sur la synthèse de nanocristaux de phosphure d'indium (InP) et en particulier sur l'utilisation de précurseurs phosphorés tels que le phosphore blanc et les aminophosphines. Les nanocristaux d'InP sont des matériaux semi-conducteurs prometteurs dans le cadre d'applications biologiques et optoélectroniques grâce à leur faible toxicité et à leurs spectres d'absorption et de fluorescence dans le visible. En outre, le phosphore blanc, allotrope le plus réactif du phosphore, est un produit industriel fabriqué à très grande échelle. Il est en effet à l'origine de tous les produits phosphorés à bas degrés d'oxydation tels que les phosphines. Sa fonctionnalisation directe visant à former des espèces chimiques nouvelles ou valorisables est un domaine de recherche actif. Alors que les nanocristaux d'InP sont traditionnellement synthétisés en utilisant une silylphosphine comme précurseur phosphoré, une nouvelle méthodologie reposant sur l'utilisation d'aminophosphines a émergé. Les aminophosphines étant plus facilement accessibles et manipulables que les silylphosphines, il s'agit d'une avancée importante pour le développement des nanocristaux d'InP. C'est pourquoi nous avons étudié précisément le mécanisme de formation de ces nanocristaux, en nous appuyant notamment sur la RMN, la spectrométrie de masse et les calculs DFT. Cette compréhension fine du mécanisme a permis l'optimisation de la synthèse des nanocristaux d'InP.L'utilisation du phosphore blanc pour former des nanocristaux d'InP repose sur la formation de nanoparticules d'indium monodisperses puis sur l'incorporation du phosphore à l'intérieur des nanoparticules. En partant d'une méthodologie de synthèse de nanoparticules d'indium de la littérature, nous avons découvert le paramètre central de la synthèse : la présence d'une quantité bien précise d'eau dans le solvant. Les nanoparticules d'indium ainsi formées sont oxydées en surface et doivent être activées afin de réagir avec le phosphore blanc.Enfin, la fonctionnalisation moléculaire du phosphore blanc avec des borohydrures pour former des liaisons P-H et par voie radicalaire pour former des silylphosphines est présentée
Ce travail de thèse porte sur la synthèse de nanocristaux de phosphure d'indium (InP) et en particulier sur l'utilisation de précurseurs phosphorés tels que le phosphore blanc et les aminophosphines. Les nanocristaux d'InP sont des matériaux semi-conducteurs prometteurs dans le cadre d'applications biologiques et optoélectroniques grâce à leur faible toxicité et à leurs spectres d'absorption et de fluorescence dans le visible. En outre, le phosphore blanc, allotrope le plus réactif du phosphore, est un produit industriel fabriqué à très grande échelle. Il est en effet à l'origine de tous les produits phosphorés à bas degrés d'oxydation tels que les phosphines. Sa fonctionnalisation directe visant à former des espèces chimiques nouvelles ou valorisables est un domaine de recherche actif. Alors que les nanocristaux d'InP sont traditionnellement synthétisés en utilisant une silylphosphine comme précurseur phosphoré, une nouvelle méthodologie reposant sur l'utilisation d'aminophosphines a émergé. Les aminophosphines étant plus facilement accessibles et manipulables que les silylphosphines, il s'agit d'une avancée importante pour le développement des nanocristaux d'InP. C'est pourquoi nous avons étudié précisément le mécanisme de formation de ces nanocristaux, en nous appuyant notamment sur la RMN, la spectrométrie de masse et les calculs DFT. Cette compréhension fine du mécanisme a permis l'optimisation de la synthèse des nanocristaux d'InP.L'utilisation du phosphore blanc pour former des nanocristaux d'InP repose sur la formation de nanoparticules d'indium monodisperses puis sur l'incorporation du phosphore à l'intérieur des nanoparticules. En partant d'une méthodologie de synthèse de nanoparticules d'indium de la littérature, nous avons découvert le paramètre central de la synthèse : la présence d'une quantité bien précise d'eau dans le solvant. Les nanoparticules d'indium ainsi formées sont oxydées en surface et doivent être activées afin de réagir avec le phosphore blanc.Enfin, la fonctionnalisation moléculaire du phosphore blanc avec des borohydrures pour former des liaisons P-H et par voie radicalaire pour former des silylphosphines est présentée
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Bhattacharyya, Koyel. "The functionalization of white phosphorus towards metal phosphide nanoparticles and organophosphines." Thesis, Toulouse 3, 2017. http://www.theses.fr/2017TOU30008/document.

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Ce manuscrit présente une synthèse originale de nanoparticules de nickel(0). L'utilisation d'un précurseur de dioléylamide de nickel(II) conduit à un procédé versatile, robuste, et sans eau pour la production de particules ajustables en taille entre 4 et 11 nm de diamètre. Cette méthode a été étendue pour former de petites nanoparticules de fer(0) et de cobalt(0). Ces particules ont été examinées en ce qui concerne l'activité catalytique, y compris l'hydrosilylation d'un alcène terminal, l'hydrogénation sélective du phénylacétylène en styrène, et la réduction sous-stoechiométrique de l'azote en tris(triméthylsilyl)amine. Le phosphore blanc (P4) a été réagi stoechiométriquement avec les nanoparticules métalliques pour former les nanoparticules de phosphure métallique correspondantes. Le phosphore blanc a été alternativement fonctionnalisé en utilisant un superhydrure (LiBEt3H) pour former une espèce phosphanide stabilisée au borane, LiPH2(BEt3)2. Cette espèce a été utilisée pour synthétiser diverses phosphines, y compris la phosphine, la tris(triméthylsilyl)phosphine, et les triaroylphosphines. Les adduits labiles de triéthylborane ont été remplacés par BH3, ce qui a donné lieu à la formation de LiPH2(BH3)2, qui peut avoir des applications dans la formation de polymères P-B
This manuscript presents an original synthesis of nickel(0) nanoparticles. The use of a nickel(II) dioleylamide precursor results in a versatile, robust, water-free method for the production of size-tunable particles between 4 - 11 nm in diameter. This method was extended to form small iron(0) and cobalt(0) nanoparticles. These particles were examined for catalytic activity, including the hydrosilylation of a terminal alkene, the selective hydrogenation of phenylacetylene to styrene, and the substoichiometric reduction of nitrogen to tris(trimethylsilyl)amine. White phosphorus (P4) was stoichiometrically reacted with the metal(0) nanoparticles to form the corresponding metal phosphide nanoparticles. White phosphorus was alternatively functionalized using superhydride (LiBEt3H) to form a borane-stabilized phosphanide species, LiPH2(BEt3)2. This species was used to synthesize various phosphines, including phosphine, tris(trimethylsilyl)phosphine, and triaroylphosphines. The labile triethylborane adducts were replaced by BH3, resulting in the formation of LiPH2(BH3)2, which may have applications in the formation of P-B polymers
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Yan, Xiao. "Phosphors for lighting applications." Thesis, Brunel University, 2012. http://bura.brunel.ac.uk/handle/2438/6954.

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Trivalent rare earth cations (RE3+) activated nanometre-sized Y2O2S and Gd2O2S phosphors were prepared by converting hydroxycarbonate precursor powders during a firing process. The precursors were prepared using the urea homoprecipitation method. The choice of host crystal and dopant were optimised to meet the specific requirements for practical applications in the field of lighting, X-ray detection, and displays. Parameters that affect the luminescent properties of the resulting phosphors, such as doping concentration, excitation mechanism, firing temperature, and host lattice were investigated. Tb3+ and Er3+ co-doped Y2O2S and Gd2O2S were studied for their upconversion properties under 632.8 nm red laser excitation. The intensities of UC emission were affected by both doping concentration and host lattices. Tb3+ and Er3+ co-doped Y2O2S was found to show strong downconversion from Tb3+ and upconversion from Er3+. The presence of the Er3+ cations directly affects the Tb3+ down-converting properties by acting as centres for energy transfer. The possible energy transfer between Gd3+ and Er3+ should be responsible for the different trend of Er3+ upconversion intensity in Y2O2S and Gd2O2S. It has been established that the Tb3+ and Er3+ co-doped system is superior than the Yb3+ and Er3+ co-doped one. In the latter system the presence of Yb3+ reduces the efficiency of both upconversion and downconversion emission under red laser excitation. These phosphors show potential applications in the security and anti-fraud field. The novel ZnS:Mn QDs were prepared and successfully incorporated into GaN based photonic crystal (PC) holes to efficiently produce white light. The crystal structure and luminescent properties of the ZnS:Mn QDs were investigated as well as the factors affecting the filling rate. Zn1-xCdxS:Mn QDs were also investigated. The addition of Cd cations leads to a red shift in the PL excitation spectra of the Zn1-xCdxS:Mn QDs. The crystal structures and surface properties were also affected by the presence of Cd. Monodisperse PbS QDs with particle size of ~5 nm has been obtained using a similar aqueous reaction method.
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Armstrong, Kenneth Mark. "Catalytic synthesis of organophosphate plastics additives from white phosphorus." Thesis, University of St Andrews, 2011. http://hdl.handle.net/10023/2587.

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Triaryl phosphates were synthesized from white phosphorus and phenols in aerobic conditions and in the presence of iron catalysts and iodine. Full conversion to phosphates was achieved without the use of chlorine or chlorinated solvents, and the reactions do not produce acid waste. Triphenyl phosphate, tritolyl phosphate and tris(2,4-di-tert-butyl)phenyl phosphate were synthesized by this method with 100% conversion from P₄. Various iron(III) diketonates were used to catalyse the conversion. Mechanistic studies showed the reaction to proceed via the formation of phosphorus triiodide (PI₃), then diphenyl phosphoroiodidate (O=PI(OPh)₂) before the final formation of triphenyl phosphate (O=P(OPh)₃). The nucleophilic substitution of O=PI(OPh)₂ with phenol to form O=P(OPh)₃ was found to be the rate determining step. It was found that by modifying the reaction conditions the same catalytic systems could be used to synthesize triphenyl phosphite directly from P₄. Triphenyl phosphite was synthesized in selectivities of up to 60 %. The mechanism of these transformations was also elucidated. Independent syntheses of the intermediate in the reaction mechanism, O=P(OPh)₂I and its hydrolysis products diphenyl phosphate (O=P(OPh)₂OH) and tetraphenyl pyrophosphate ((O)P(OPh)₂-O-P(O)(OPh)₂) were developed from PI₃. The 2,4-di-tert-butyl phenol analogues of these compounds were also prepared. Bis-(2,4-di-tert-butylphenyl) phosphoroiodidate was then reacted with various alcohols to produce a series of mixed triorgano phosphates.
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Stephens, Frances H. (Frances Helen) 1977. "Activation of white phosphorus by molybdenum- and uranium tris-amides." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/17841.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 2004.
Vita.
Includes bibliographical references.
Molybdaziridine-hydride Mo(H)([eta]²-Me₂C=NAr)(N[i-Pr]Ar)₂ (1, Ar = 3,5-C₆H₃Me₂) acts as a source of its three-coordinate isomer Mo(N[i-Pr]Ar)₃ (2). This relationship has been probed via an investigation of the coordination chemistry of 1 and Mo(N[t-Bu]Ar)3 (3), a bulky analog of 2, with isocyanides RNC (R = 1-adamantyl, tert-butyl) and white phosphorus (P₄). A comparison of the rates and activation parameters of these reactions indicates that 2 is not an intermediate on the pathway from 1 to products, but rather than the molybdaziridine-hydride "opens" upon substrate binding in an associative process. Synthesis and characterization of 1:1 and 1:2 isocyanide adducts of 2 and 3, and bridging and terminal Pn compounds of molybdenum derived from the element P4 and their alcoholysis products are presented. The uranium tris-amide compounds (THF)U(N[R]Ar)₃ (R = t-Bu, 1-Ad) reacted with white phosphorus. The unique products contain a square tetraphosphorus moiety characterized formally as the dianion P₄□□₂₋. Structural and theoretical analyses are provided for this system.
by Frances H. Stephens.
Ph.D.
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Tailliez, Antoine. "Effet de l’exsudation de citrate chez le lupin blanc sur la phytodisponibilité de l’uranium." Thesis, Aix-Marseille, 2013. http://www.theses.fr/2013AIXM4335/document.

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L’étude proposée s’inscrit dans un contexte de contamination croissante de la pédosphère et fait le choix d’appréhender cette problématique via une approche centrée sur la rhizospère et sur les mécanismes gouvernant son évolution. Ces travaux s'intéressent à la relation entre l’uranium – un métal naturel ubiquiste non-essentiel – et le citrate – un acide organique de faible poids moléculaire exsudé par certaines espèces végétales poussant sur un milieu pauvre en phosphore. Parmi ces espèces particulières le lupin blanc (Lupinus albus) fait office de plante modèle. Un sol naturellement riche en uranium prélevé à l’affleurement d’une veine de pechblende a été étudié. L’objectif du travail a été de savoir si l’activité racinaire est suffisante pour provoquer la remobilisation de l’uranium dans la solution du sol et favoriser son transfert. Le système sol/plante a été étudié sur rhizotest et de manière découplée en hydroponie et en réacteurs fermés. Il a été démontré que la présence d’uranium dans un milieu contrôlé (hydroponie) stimule l’exsudation de citrate chez les lupins blancs qui ne sont pas carencés en phosphore et que cette exsudation de citrate favorise la solubilisation de l’uranium dans la solution du sol en réacteurs fermés. Ces résultats ont été confirmés par les observations faites sur rhizotest même si les valeurs obtenues dans ce cas étaient plus nuancées. Ceci justifie les approches utilisées et met en évidence leur complémentarité. Les résultats obtenus ont également permis d’apporter des informations concernant la toxicité de l’uranium, son internalisation dans les cellules racinaires ainsi que sur son transfert des racines aux parties aériennes
The present study is related to the context of pedosphere contamination increasing and chose to consider this issue through a focus on rhizosphere and mechanisms that govern its evolution. This work is oriented on the relation between uranium – a non-essential ubiquitous metal – and citrate – a low molecular weight organic acid exudated by specific species when grown on a phosphorus-deficient environment. Among these particular species white lupine (Lupinus albus) is considered as a model species. Furthermore, a natural soil containing huge amounts of uranium has been collected at the outcrop of a pitchblende vein and used during some experiments. The main aim of this PhD thesis was to determine if the root activity of white lupine is sufficient to cause the remobilization of uranium into soil solution and so to promote the transfer of this contaminant to the plant. The soil/plant system has been studied with rhizotests and by combining datas obtained with hydroponics experiments and batches tests. It has been demonstrated that the presence of uranium in a controlled growth medium (hydropony) stimulates citrate exudation in P-sufficient white lupine. More, this citrate exudation enhances uranium solubilization in soil solution in batches. These results have been confirmed by observations on rhizotest even if the values in this case were more nuanced. This justifies the employed approaches and highlights their coherence and complementarity. The results also allowed to provide additional information concerning uranium toxicity, its internalization in root cells as well as its transfer from roots to aerial parts
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Books on the topic "White Phosphor"

1

United States. Agency for Toxic Substances and Disease Registry. Division of Toxicology. White phosphorus. Atlanta, GA: Department of Health and Human Services, Public Health Service, Agency for Toxic Substances and Disease Registry, 1997.

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Walsh, Marianne E. Persistence of white phosphorus particles in sediment. [Hanover, N.H.]: U.S. Army Corps of Engineers, Cold Regions Research & Engineering Laboratory, 1995.

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E, Walsh Marianne, U.S. Army Environmental Center., and Cold Regions Research and Engineering Laboratory (U.S.), eds. Simple field screening method for white phosphorus (P₄) in sediment. [Hanover, N.H.]: U.S. Army Corps of Engineers, Cold Regions Research & Engineering Laboratory, 1995.

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(Organization), Human Rights Watch. Rain of fire: Israel's unlawful use of white phosphorus in Gaza. New York: Human Rights Watch, 2009.

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Walsh, Marianne E. Method for producing performance evaluation soil/sediment samples for white phosphorus analysis. Hanover, N.H: US Army Corps of Engineers, Cold Regions Research & Engineering Laboratory, 1996.

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E, Lawson Daniel, United States. Army. Corps of Engineers., and Cold Regions Research and Engineering Laboratory (U.S.), eds. Physical system dynamics and white phosphorus fate and transport, 1994, Eagle River Flats, Fort Richardson, Alaska. Hanover, NH: U.S. Army Corps of Engineers, Cold Regions Research & Engineering Laboratory, 1996.

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H, Johnson James, and Construction Engineering Research Laboratories (U.S.), eds. Level II audit of white phosphorus dry-fill process: Pine Bluff Arsenal, AR. [Champaign, IL]: US Army Corps of Engineers, Construction Engineering Research Laboratories, 1997.

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Rivera, Yilda B. Summary and evaluation for white phosporus remediation: A literature review. [Vicksburg, Miss: U.S. Army Engineer Waterways Experiment Station, 1996.

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Lawson, Daniel E. Physical processes and natural attenuation alternatives for remediation of white phosphorus contamination, Eagle River Flats, Fort Richardson, Alaska. [Hanover, N.H.]: US Army Corps of Engineers, Cold Regions Research & Engineering Laboratory, 1996.

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Walsh, Marianne E. Development of an analytical method for white phosphorus (P₄) in water and sediment using solid-phase microextraction. Hanover, N.H: US Army Corps of Engineers, Cold Regions Research & Engineering Laboratory, 1996.

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Book chapters on the topic "White Phosphor"

1

Sharma, Geeta, and Pankaj Poddar. "Organic–Inorganic Hybrids for White-Light Phosphors." In Hybrid Phosphor Materials, 105–18. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-90506-4_4.

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Meretska, Maryna, H. Thyrrestrup, A. Lagendijk, T. W. Tukker, A. P. Mosk, W. L. Ijzerman, and W. Vos. "Transport of Light Through White-LED Phosphor Plates." In NATO Science for Peace and Security Series B: Physics and Biophysics, 467–68. Dordrecht: Springer Netherlands, 2017. http://dx.doi.org/10.1007/978-94-024-0850-8_37.

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Fan, Jiajie, Cheng Qian, Xuejun Fan, Guo Qi Zhang, and Michael Pecht. "Fault Diagnostics and Lifetime Prognostics for Phosphor-Converted White LED Packages." In Solid State Lighting Reliability Part 2, 255–99. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-58175-0_11.

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Choi, Kyoung Jae, Joung Kyu Park, Kyung Nam Kim, Chang Hae Kim, and Ho Kun Kim. "Phosphor-Conversion White Light Emitting Diode Using InGaN Near-Ultraviolet Chip." In Solid State Phenomena, 499–502. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/3-908451-31-0.499.

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Guo, Qiwei, Yueming Hu, Zhifu Li, and Ge Ma. "Research of Piezoelectric Printing Actuator for High-Power White LED Phosphor Coating." In Intelligent Robotics and Applications, 116–26. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-33515-0_12.

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Qian, C., J. J. Fan, J. L. Huang, X. J. Fan, and G. Q. Zhang. "An Introduction of the Phosphor-Converted White LED Packaging and Its Reliability." In Nano-Bio- Electronic, Photonic and MEMS Packaging, 419–34. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-49991-4_18.

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Quoc Anh, Nguyen Doan, and Hsiao-Yi Lee. "Improvement of Angular CCT Uniformity in Multi-Chip White LED with Silica–Phosphor Mixture." In Lecture Notes in Electrical Engineering, 1229–34. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-04573-3_149.

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Pradhan, Subhajit, and M. Jayasimhadri. "Exploration on Photoluminescence Features in Pr3+-Doped Sodium-Calcium Orthosilicate Phosphor for White LEDs." In Lecture Notes in Mechanical Engineering, 141–48. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-9613-8_13.

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Anh, Nguyen Doan Quoc, and Nguyen Ngoc Long. "Improvement of Optical Properties of White LED Lamps Using Green-Emitting Ce0.67Tb0.33MgAl11O19:Ce,Tb Phosphor." In Improved Performance of Materials, 239–44. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-59590-0_20.

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Son, Chang Sik, Ho Jung Chang, Kang Hyun Jaekal, Young Chol Chang, and Soo Wohn Lee. "Dependence of Yellow Phosphor on Optical and Electrical Properties of the White Light Emitting Diode Chip." In Materials Science Forum, 106–9. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-995-4.106.

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Conference papers on the topic "White Phosphor"

1

Acuña, Paula, António Correia, Jana Ryckaert, Youri Meuret, Geert Deconinck, and Peter Hanselaer. "Spot phosphor concept applied to the remote phosphor configuration of a white phosphor-converted LED." In SPIE Photonics Europe, edited by Frank Wyrowski, John T. Sheridan, and Youri Meuret. SPIE, 2016. http://dx.doi.org/10.1117/12.2225986.

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Sarangi, Sachindra Nath, Arun T., Dinseh K. Ray, Pratap Kumar Sahoo, Shinji Nozaki, Noriyuki Sugiyama, and Kazuo Uchida. "ZnO-nanorods: A possible white LED phosphor." In DAE SOLID STATE PHYSICS SYMPOSIUM 2016. Author(s), 2017. http://dx.doi.org/10.1063/1.4980427.

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Zheng, Huai, Yiman Wang, Xing Fu, Xiaobing Luo, and Sheng Liu. "Conformal phosphor coating for phosphor-converted white LEDs on basis of dispensing process." In 2013 14th International Conference on Electronic Packaging Technology (ICEPT). IEEE, 2013. http://dx.doi.org/10.1109/icept.2013.6756659.

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Yu, Xingjian, Weicheng Shu, Bofeng Shang, Bin Xie, Yanhua Cheng, and Xiaobing Luo. "Color Uniformity Enhancement of White Light-Emitting Diodes With Novel Bell Shape Phosphor Layer." In ASME 2017 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems collocated with the ASME 2017 Conference on Information Storage and Processing Systems. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/ipack2017-74195.

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In this study, we proposed a bell shape phosphor layer geometry and the corresponding dual-step phosphor coating method for enhancing the angular color uniformity (ACU) of phosphor-converted white light-emitting diodes (pcLEDs). Numerical simulation based on Volume of Fluid (VOF) model was applied to predict phosphor geometries. Based on the simulated results, experiments were conducted to realize the phosphor geometries. The simulated results show that the VOF model can predict the phosphor geometries with an acceptable geometric deviation within 5%. The experimental results show that compared with the spherical cap phosphor layer geometry, the bell shape geometry can achieve better ACU performance, an optimal bell phosphor layer geometry with equal coating volume above and around the LED chip was achieved, for the corrected color temperature (CCT) of 4000 K, the angular CCT deviation of the optimal geometry is 62 K, while it is 382 K for the spherical cap geometry.
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Sun, Ching-Cherng, Yu-Yu Chang, Cheng-Chien Chen, Ching-Yi Chen, and Tsung-Hsun Yang. "Packaging efficiency analysis of phosphor-converted white LEDs." In SPIE Optical Engineering + Applications, edited by R. Barry Johnson, Virendra N. Mahajan, and Simon Thibault. SPIE, 2014. http://dx.doi.org/10.1117/12.2063770.

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Narita, Miyuki. "White-LED coated by new-system including phosphor." In Fifth International Conference on Solid State Lighting. SPIE, 2005. http://dx.doi.org/10.1117/12.618007.

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Heikkinen, V., J. Aaltonen, I. Kassamakov, B. Wälchli, H. Räikkönen, T. Paulin, and E. Hæggström. "Non-phosphor white LED light source for interferometry." In SPIE Optical Engineering + Applications. SPIE, 2011. http://dx.doi.org/10.1117/12.893691.

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Hu, Run, Jinyan Hu, and Xiaobing Luo. "Phosphor temperature reduction by optimizing the phosphor configuration in white light-emitting diode package." In 2014 IEEE Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems (ITherm). IEEE, 2014. http://dx.doi.org/10.1109/itherm.2014.6892279.

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Yu, Xingjian, Falong Liu, Yupu Ma, Mengyu Huang, and Xiaobing Luo. "A remote phosphor coating by lens wetting for phosphor-converted white light-emitting diodes." In 2016 17th International Conference on Electronic Packaging Technology (ICEPT). IEEE, 2016. http://dx.doi.org/10.1109/icept.2016.7583212.

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Wu, Jiading, Jingcao Chu, Zefeng Zhang, Xianglei, Chunlin Xu, Huai Zheng, Jiahui Huang, and Sheng Liu. "Study on conformal phosphor coating for phosphor converted white LEDs through ionic wind patterning." In 2016 17th International Conference on Electronic Packaging Technology (ICEPT). IEEE, 2016. http://dx.doi.org/10.1109/icept.2016.7583307.

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Reports on the topic "White Phosphor"

1

Sun, Sey-Shing. Development of a Manufacturable Blue Electroluminescent (EL) Phosphor Process for the Production of White Monochrome Thin Film Electroluminescent (TFEL) and Full Color Active Matrix Electroluminescent (AMEL) Displays. Fort Belvoir, VA: Defense Technical Information Center, November 2002. http://dx.doi.org/10.21236/ada408952.

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2

Rainey, Darrell R., and Mark M. Zaugg. Demilitarization of White Phosphorus Munitions. Fort Belvoir, VA: Defense Technical Information Center, August 1990. http://dx.doi.org/10.21236/ada529908.

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Setlur, Anant, Megan Brewster, Florencio Garcia, M. Christine Hill, Robert Lyons, James Murphy, Tom Stecher, et al. Optimized Phosphors for Warm White LED Light Engines. Office of Scientific and Technical Information (OSTI), July 2012. http://dx.doi.org/10.2172/1090708.

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Davis, B., and L. Martino. White phosphorus pits focused feasibility study final July 2007. Office of Scientific and Technical Information (OSTI), August 2007. http://dx.doi.org/10.2172/915039.

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McKittrick, Joanna. Phosphors for near UV-Emitting LED's for Efficacious Generation of White Light. Office of Scientific and Technical Information (OSTI), September 2013. http://dx.doi.org/10.2172/1113955.

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McIntosh, Jr, and Alfred C. MIL-STD-1660 Test of Unitization Procedure for 105mm White Phosphorus (WP) Projectiles. Fort Belvoir, VA: Defense Technical Information Center, November 1987. http://dx.doi.org/10.21236/ada207181.

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Racine, Charles H., Marianne E. Walsh, Charles M. Collins, Susan Taylor, Bill D. Roebuck, Leonard Reitsma, and Ben Steele. Remedial Investigation Report: White Phosphorus Contamination of Salt Marsh Sediments at Eagle River Flats, Alaska. Fort Belvoir, VA: Defense Technical Information Center, March 1992. http://dx.doi.org/10.21236/ada250515.

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Racine, Charles H., Marianne E. Walsh, Charles M. Collins, and Susan Taylor. Remedial Investigation Report: White Phosphorus Contamination of Salt Marsh Sediments at Eagle River Flats, Alaska. Fort Belvoir, VA: Defense Technical Information Center, March 1992. http://dx.doi.org/10.21236/ada250899.

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Poston, T. M., K. M. McFadden, R. M. Bean, M. L. Clark, B. L. Thomas, B. W. Killand, L. A. Prohammer, and D. R. Kalkwarf. Acute toxicity of smoke screen materials to aquatic organisms, white phosphorus-felt, red phosphorus-butyl rubber and SGF No. 2 fog oil. Final report. Office of Scientific and Technical Information (OSTI), April 1986. http://dx.doi.org/10.2172/5858534.

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Walsh, M. E., C. H. Racine, C. M. Collins, M. R. Walsh, and R. N. Bailey. Remediating and Monitoring White Phosphorus Contamination at Eagle River Flats (Operable Unit C), Fort Richardson, Alaska. Fort Belvoir, VA: Defense Technical Information Center, August 2001. http://dx.doi.org/10.21236/ada431045.

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