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Auteur : Grafiati
Publié le 14 mars 2023

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1

Gao, Dangli, Jie Gao, Feng Gao, Qingqing Kuang, Yong Pan, Yafei Chen et Zhengwei Pan. « Quintuple-mode dynamic anti-counterfeiting using multi-mode persistent phosphors ». Journal of Materials Chemistry C 9, no 46 (2021) : 16634–44. http://dx.doi.org/10.1039/d1tc04568g.

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Multi-level, dynamic optical anti-counterfeiting has been achieved using multi-mode phosphors as luminescent inks. The ZGGO:Cr,Yb,Er phosphors exhibit quintuple luminescence modes, while the ZLGO:Mn phosphors possess quadruple luminescence modes.
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2

Ishikawa, Yukari, Junichi Niitsuma, Shigeru Tanaka, Dai Nezaki, Mitsuhiro Okamoto, Masashi Yamashita, Takashi Sekiguchi et Noriyoshi Shibata. « Luminescent Characteristics of Undoped and Er-Doped ZnO Thin Films ». Key Engineering Materials 301 (janvier 2006) : 189–92. http://dx.doi.org/10.4028/www.scientific.net/kem.301.189.

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In order to clarify the fundamental luminescent mechanism of undoped and Er-doped ZnO thin films synthesized by sputtering method, cathodoluminescence (CL) from the samples formed on several kinds of substrate were measured. There was no explicit peak identified with luminescence from ZnO crystal defects in undoped sample, on the contrary, three sharp luminescent peaks were observed in the case of Er-doped ZnO film due to the internal transition of the additive Er ions in the CL spectrum. The mechanism was investigated in comparison with photoluminescence (PL).
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3

Moskvitina, E. A., V. A. Vorobiev et B. M. Bolotin. « Study of Luminescent Properties of CaNb2O6:Yb, Er, Tm ». Herald of the Bauman Moscow State Technical University. Series Natural Sciences, no 3 (90) (juin 2020) : 78–87. http://dx.doi.org/10.18698/1812-3368-2020-3-78-87.

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We used solid phase synthesis at 1200 °C to create a luminophore based on CaNb2O6 and activated by ytterbium, erbium, and thulium ions. We present X-ray phase analysis results for the CaNb2O6:Yb, Er, Tm compound. The X-ray diffraction patterns obtained do not contain reflexes belonging to the intermediate phases. We investigated spectral properties of a calcium niobate-based luminophore upon excitation by a 940 nm laser. There are bands in the visible and IR regions to be found in the luminescence spectra. The up-conversion (anti-Stokes emission) luminescence spectrum comprises three bands peaking at 560, 676 and 807 nm. In the IR range, there are three peaks to be detected in the luminescence spectrum at 1010, 1540 and 1812 nm. We established the luminescence variation patterns for compounds based on CaNb2O6:Yb, Er, Tm. We determined the optimum Tm3+ concentration in the system that makes it possible to achieve the highest luminescence efficiency in the 1640--2000 nm range peaking at 1812 nm. We considered an energy transfer mechanism involving Yb3+ and Er3+ as luminescence stabilisers in a thulium ion. Employing erbium as an additional sensitiser allowed the luminescence intensity in the 1812 nm band to be increased by 1.5 time
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4

Wang, Zhuo, Guotao Sun, Jiabo Chen, Yao Xie, Hong Jiang et Lining Sun. « Upconversion Luminescent Humidity Sensors Based on Lanthanide-Doped MOFs ». Chemosensors 10, no 2 (7 février 2022) : 66. http://dx.doi.org/10.3390/chemosensors10020066.

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Lanthanide-doped metal-organic frameworks (Y/Yb/Er-MOF) were synthesized by a low-cost solvothermal method. The obtained Y/Yb/Er-MOF shows the cooperative upconversion luminescence of Yb3+ and upconversion luminescence of Er3+ (Yb3+-sensitized) irradiated by a continuous wave 980 nm laser. In order to explore the potential application of Y/Yb/Er-MOF in relative humidity (RH) sensors, the RH responsiveness of Y/Yb/Er-MOF was investigated by measuring the intensity changes of upconversion luminescence. The Y/Yb/Er-MOF possesses two luminescence centers, in which Yb3+ forms emission at 500 nm through the cooperative luminescence effect, and Er3+ achieves 660 nm emission through excited state absorption and successive energy transfer from Yb3+. Hence, the ratio meter luminescence sensor for RH is constructed based on Y/Yb/Er-MOF. The results show that the response of Y/Yb/Er-MOF to RH presents a linear relationship in the range of 11–95%. The cycle stability of Y/Yb/Er-MOF responses to RH was investigated with the intensity changes of upconversion luminescence, and the recovery ratio was more than 93% each time. Therefore, the Y/Yb/Er-MOF is a humidity-sensitive material with great potential for applications such as humidity sensors.
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5

Pan, Er, Gongxun Bai, Yutao Peng, Liang Chen et Shiqing Xu. « Promoting luminescence of Yb/Er codoped ferroelectric composite by polarization engineering for optoelectronic applications ». Nanophotonics 8, no 12 (17 septembre 2019) : 2215–23. http://dx.doi.org/10.1515/nanoph-2019-0230.

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AbstractFerroelectric oxide nanocrystals, in combination with the robust coupling of an electric field with crystal structure symmetry, makes such systems agreeable to field-induced crystal structural transformation. The luminescent properties of rare earth ions are sensitive to the symmetry of the surrounding crystal field. The luminescence tuning of rare earth ions is an important assignment in the research of luminescent materials. However, the current conditional feasibility and reversibility in the exploration of luminescence modification remain major challenges. In this article, the luminescence modulation of rare earth ions has been developed in Yb3+/Er3+ codoped ferroelectrics glass ceramics containing Bi4Ti3O12 nanocrystals through an electric field. The inclusion of nanocrystals in the glass matrix greatly enhances the electrical resistance. Both upconversion and near-infrared emissions of rare earth ions are effectively enhanced more than twice via polarization engineering. The electric field regulates the photonic properties of rare earth ions with excellent reversibility and nonvolatility in ferroelectrics. The effective modification by electric field provides a new scheme for optical storage and optoelectronic devices.
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6

Mar’ina, Ul’ana A., Viktor A. Vorob’ev et Alexandr P. Mar’in. « CaSnO 3 : Yb 3+, Er 3+, Ho 3+ system synthesis and study of its luminescence under IR excitation ». Modern Electronic Materials 4, no 2 (1 juin 2018) : 71–75. http://dx.doi.org/10.3897/j.moem.4.2.38545.

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Solid state synthesis of Perovskite-like calcium stannate structure activated with three rare-Earth metal ions Yb3+,Er3+,Но3+ has been studied. The formation of the CaSnO3 : Yb3+,Er3+,Но3+ luminescent structure requires the following synthesis conditions: anneal temperature 1250 °C and duration at least 18 h. The luminescent properties of the specimens have been studied under 960 nm semiconductor diode laser excitation. The luminescence spectra contain bands in the visible and IR spectral regions. Yb3+ ions have been shown to act predominantly as sensibilizers capable of transferring part of absorbed energy to Er3+ and Но3+ ions thus intensifying their respective luminescence peaks. Er3+ ions also transfer part of absorbed energy to Но3+ ions leading to an increase in the intensity of the 1194 and 1950 nm IR luminescence bands. A schematic of possible energy transitions in the CaSnO3 : Yb3+,Er3+,Но3+ system under 960 nm laser excitation has been suggested. The energy transfer mechanism between Yb3+,Er3+ and Но3+ions has been described in detail. The luminescence intensity of the luminophore has been studied at 994, 1194, 1550 and 1950 nm as a function of Но3+ion concentration. The peak intensity of the 1194 and 1950 nm bands is the highest at a Но3+ion concentration of 0.007 at.fr. It has been suggested to use the CaSnO3 : Yb3+,Er3+,Но3+ luminescent structure for radiation sources capable of converting 960 nm IR radiation to ~2000 nm IR radiation.
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7

Ofuchi, H., D. Kawamura, J. Tsuchiya, N. Matsubara, M. Tabuchi, Y. Fujiwara et Y. Takeda. « Local structure study of dilute Er in III–V semiconductors by fluorescence EXAFS ». Journal of Synchrotron Radiation 5, no 3 (1 mai 1998) : 1061–63. http://dx.doi.org/10.1107/s0909049597018566.

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For understanding the luminescence of Er atoms in III–V semiconductors, OMVPE-grown InP doped with Er has been investigated by fluorescence EXAFS (extended X-ray absorption fine structure) in order to study the local structure around Er atoms. The local structures around the Er atoms doped in InP, with doping as dilute as 3 × 1012 Er atoms in a 1.5 mm × 1.0 mm spot, were successfully measured by fluorescence EXAFS. The EXAFS analysis revealed that the Er atoms doped in InP above 853 K (which showed low luminescence) formed the rock-salt-structure ErP, while the Er atoms doped in InP below 823 K (which showed high luminescence) substituted on the In site of InP. The dependence of the local structure on growth temperature was observed for the samples doped with 3 × 1012 atoms and 1.2 × 1013 atoms of Er.
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8

Ronzhin, N., E. Posokhina, O. Mogilnaya, A. Puzyr, J. Gitelson et V. Bondar. « CYTOCHROME P450 SYSTEM MAY BE INVOLVED IN THE LIGHT EMISSION OF HIGHER FUNGI ». Russian Journal of Biological Physics and Chemisrty 7, no 2 (15 novembre 2022) : 320–24. http://dx.doi.org/10.29039/rusjbpc.2022.0522.

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The paper presents data that testify in favor of the participation of the cytochrome P450 system in the light emission of higher fungi. Extracts from mycelia of different species of luminous basidiomycetes containing fungal luminescent systems that provide luminescence in vitro were obtained. Applied conditions for the isolation of luminescent systems (sonication, centrifugation at 40000g) indicate the presence of membrane structures in the extracts, in particular, microsomes formed as a result of ultrasonic disintegration of the endoplasmic reticulum (ER). Differential spectral analysis of the extracts revealed the presence of two absorption peaks at 410 nm and 450 nm, which indicates the presence of cytochromes b5 and P450. The luminescence of the extracts is stimulated by reduced pyridine nucleotides, however, the addition of NADPH causes a higher level of luminescence compared with NADH. The addition of hydrogen peroxide significantly (from several times to 1-2 orders of magnitude) increases the luminescence intensity of extracts activated by NAD(P)H. The addition of fluconazole significantly inhibits the light emission of extracts. The data obtained indicates that the cytochrome P450 system associated with ER membranes may participate in the mechanism of light emission of higher fungi with the involvement in the process of electron transport enzyme systems: NADPH-dependent reductase of cytochrome P450 - cytochrome P450 and NADH-dependent reductase of cytochrome b5 - cytochrome b5 - cytochrome P450. In this case, cytochrome P450 may hydroxylate hispidin (precursor of the luminescent reaction substrate) to form luciferin and catalyze its oxidation in the presence of ROS with light emission.
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9

Luo, Jianxin, Chunyan Zhang, Changhong Li, Hanxiang Hu et Bonian Hu. « Multiplicate sensitization of novel near-infrared luminescent linear copolymers based on Er, Nd and Yb-complexes ». RSC Adv. 4, no 101 (2014) : 57393–401. http://dx.doi.org/10.1039/c4ra08093a.

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A series of novel near-infrared (NIR) luminescent linear copolymers (PCzLnQL2) covalently linked with Ln-complexes were synthesized and characterized. The copolymers show broadband sensitized and highly efficient NIR luminescence.
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10

Carl, Frederike, Leonie Birk, Bettina Grauel, Monica Pons, Christian Würth, Ute Resch-Genger et Markus Haase. « LiYF4:Yb/LiYF4 and LiYF4:Yb,Er/LiYF4 core/shell nanocrystals with luminescence decay times similar to YLF laser crystals and the upconversion quantum yield of the Yb,Er doped nanocrystals ». Nano Research 14, no 3 (16 octobre 2020) : 797–806. http://dx.doi.org/10.1007/s12274-020-3116-y.

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AbstractWe developed a procedure to prepare luminescent LiYF4:Yb/LiYF4 and LiYF4:Yb,Er/LiYF4 core/shell nanocrystals with a size of approximately 40 nm revealing luminescence decay times of the dopant ions that approach those of high-quality laser crystals of LiYF4:Yb (Yb:YLF) and LiYF4:Yb,Er (Yb,Er:YLF) with identical doping concentrations. As the luminescence decay times of Yb3+ and Er3+ are known to be very sensitive to the presence of quenchers, the long decay times of the core/shell nanocrystals indicate a very low number of defects in the core particles and at the core/shell interfaces. This improvement in the performance was achieved by introducing two important modifications in the commonly used oleic acid based synthesis. First, the shell was prepared via a newly developed method characterized by a very low nucleation rate for particles of pure LiYF4 shell material. Second, anhydrous acetates were used as precursors and additional drying steps were applied to reduce the incorporation of OH− in the crystal lattice, known to quench the emission of Yb3+ ions. Excitation power density (P)-dependent absolute measurements of the upconversion luminescence quantum yield (ΦUC) of LiYF4:Yb,Er/LiYF4 core/shell particles reveal a maximum value of 1.25% at P of 180 Wcm−2. Although lower than the values reported for NaYF4:18%Yb,2%Er core/shell nanocrystals with comparable sizes, these ΦUC values are the highest reported so far for LiYF4:18%Yb,2%Er/LiYF4 nanocrystals without additional dopants. Further improvements may nevertheless be possible by optimizing the dopant concentrations in the LiYF4 nanocrystals.
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11

Kozanecki, A., W. Jantsch, W. Heis, G. Prechtl, B. J. Sealy et C. Jeynes. « Infrared Luminescence in Er and Er+O Implanted 6H SiC ». Acta Physica Polonica A 92, no 5 (novembre 1997) : 879–82. http://dx.doi.org/10.12693/aphyspola.92.879.

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12

Wang, J. Z., Z. Q. Shi, Y. Shi, L. Pu, L. J. Pan, R. Zhang, Y. D. Zheng, Z. S. Tao et F. Lu. « Broad excitation of Er luminescence in Er-doped HfO2 films ». Applied Physics A 94, no 2 (1 août 2008) : 399–403. http://dx.doi.org/10.1007/s00339-008-4820-8.

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13

Zhao, Peng, Jing Zhang, Yihua Zhu, Xiaoling Yang, Xin Jiang, Yuan Yuan, Changsheng Liu et Chunzhong Li. « A novel strategy for the aqueous synthesis of down-/up-conversion nanocomposites for dual-modal cell imaging and drug delivery ». J. Mater. Chem. B 2, no 47 (2014) : 8372–77. http://dx.doi.org/10.1039/c4tb01445f.

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A highly efficient multifunctional nanoplatform for dual-modal luminescence imaging and pH-responsive drug delivery has been developed on the basis of a facile and novel strategy by covalently binding up-conversion luminescent NaYF4:Yb,Er nanoparticles with down-conversion fluorescent AgInS2–ZnS quantum dots.
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14

Gruzintsev, A. N. « Anti-stokes luminescence of Y2O3:Er ». Inorganic Materials 50, no 1 (17 décembre 2013) : 58–62. http://dx.doi.org/10.1134/s0020168514010087.

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15

Yi, Li, Zhou Yong-Dong, Li Ju-Sheng, Jiang Hong et Jin Yi-Xin. « Luminescence of Er-implanted porous silicon ». Solid State Communications 96, no 5 (novembre 1995) : 317–20. http://dx.doi.org/10.1016/0038-1098(95)00448-3.

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16

Gusev, Oleg B., E. K. Lindmark, J. P. Prineas, M. S. Bresler, G. Khitrova, H. M. Gibbs, I. N. Yassievich, B. P. Zakharchenya et V. F. Masterov. « Er-Luminescence in MBE-Grown AlGaAs ». Materials Science Forum 258-263 (décembre 1997) : 1583–88. http://dx.doi.org/10.4028/www.scientific.net/msf.258-263.1583.

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17

Sagaidachnaya, Elena A., et Vyacheslav I. Kochubey. « Effect of the Temperature of NaYF4 : Er,Yb Upсonversion Particles on the Formation of Luminescence ». Izvestiya of Saratov University. New series. Series : Physics 20, no 4 (2020) : 306–10. http://dx.doi.org/10.18500/1817-3020-2020-20-4-306-310.

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The intensity of upconversion luminescence depends nonlinearly on the excitation intensity. The aim of this work is to study the effect of the temperature of NaYF4:Er,Yb upconversion particles on the dependence of the luminescence intensity on the excitation intensity. The synthesized particles were observed to have the shape of a hexagonal prism with a width of about 440 nm and a height of 445 nm. The upconversion luminescence spectra were obtained in the temperature range of 22–55° C with the excitation intensity in the range of 1.5–9.4 W/cm2. The obtained results show the green-band luminescence photons can be generated by means of two-step and three-step mechanisms: the contribution of these mechanisms depends on the temperature of the particles. As the temperature increases, the contribution of the three-stage mechanism of green luminescence excitation is enhanced.
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18

Ansari, Anees A., Ranvijay Yadav et S. B. Rai. « Physiochemical properties of greatly enhanced photoluminescence of aqueous dispersible upconversion CaF2:Yb/Er nanoparticles ». Photochemical & ; Photobiological Sciences 16, no 6 (2017) : 890–96. http://dx.doi.org/10.1039/c6pp00448b.

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Highly aqueous soluble CaF2:Yb/Er@CaF2@SiO2 upconversion nanoparticles were prepared via metal complex decomposition rout. Gradually surface coating with an inert CaF2 and silica layers greatly enhanced their optical and luminescence properties, which are highly usable for luminescent biolabeling or optical bio-probe etc.
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19

Cao, Cong, Yu Xie, Shi-Wen Li et Chang Hong. « Er3+-Ions-Doped Multiscale Nanoprobes for Fluorescence Imaging in Cellular and Living Mice ». Nanomaterials 11, no 10 (12 octobre 2021) : 2676. http://dx.doi.org/10.3390/nano11102676.

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With the development of biotechnology, luminescent nanoprobes for biological disease detection are widely used. However, the further application in clinic is limited by the reduced penetration depth in the tissues and light scattering. In this work, we have synthesized NaYF4:Yb,Er,Ce@SiO2-OAlg nanomaterials, which have both upconversion and near-infrared (NIR) luminescence. The optimized probes were determined to achieve cell imaging by its upconversion (UCL) luminescence and in vivo imaging through collection of NIR fluorescence signals simultaneously. The research is conducive to developing accurate diagnostic techniques based on UCL and NIR fluorescence imaging by a single nanoparticle.
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20

Gruzintsev A.N. « Optical modulation of anti-stokes photoluminescence of the Y-=SUB=-2-=/SUB=-O-=SUB=-2-=/SUB=-S : Er ». Physics of the Solid State 64, no 7 (2022) : 831. http://dx.doi.org/10.21883/pss.2022.07.54589.320.

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The luminescence and excitation spectra of visible photoluminescence of Y2O2S : Er ceramics (1 at.%) at different optical pumping have been studied. It is shown that the anti-Stokes luminescence of single crystals doped with erbium has a high intensity when pumping the metastable state 4I13/2 of impurities. The resonant wavelengths of IR-photons for two-photon excitation of the visible glow Y2O2S : Er. are determined. A method of photooptical modulation of anti-Stokes luminescence has been developed, which makes it possible to determine the nature of the corresponding electronic transitions inside the excited glow centers. Keywords: Luminescence, excitation, photooptical modulation.
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21

Kellerman, D. G., M. O. Kalinkin, R. M. Abashev, N. I. Medvedeva, A. I. Surdo et A. P. Tyutyunnik. « Unusual intrinsic thermoluminescence in LiMgPO4:Er ». Physical Chemistry Chemical Physics 22, no 47 (2020) : 27632–44. http://dx.doi.org/10.1039/d0cp05185c.

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22

Hömmerich, U., J. T. Seo, J. D. MacKenzie, C. R. Abernathy, R. Birkhahn, A. J. Steckl et J. M. Zavada. « Comparison of the Optical Properties of Er3+ Doped Gallium Nitride Prepared by Metalorganic Molecular Beam Epitaxy (Mombe) and Solid Source Molecular Beam Epitaxy (SSMBE) ». MRS Internet Journal of Nitride Semiconductor Research 5, S1 (2000) : 824–30. http://dx.doi.org/10.1557/s1092578300005135.

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We report on the luminescence properties of Er doped GaN grown prepared by metalorganic molecular beam epitaxy (MOMBE) and solid-source molecular beam epitaxy (SSMBE) on Si substrates. Both types of samples emitted characteristic 1.54 µm PL resulting from the intra-4f Er3+ transition 4I13/2→4I15/2. Under below-gap excitation the samples exhibited very similar 1.54 µm PL intensities. On the contrary, under above-gap excitation GaN: Er (SSMBE) showed ∼80 times more intense 1.54 µm PL than GaN: Er (MOMBE). In addition, GaN: Er (SSMBE) also emitted intense green luminescence at 537 nm and 558 nm, which was not observed from GaN: Er (MOMBE). The average lifetime of the green PL was determined to be 10.8 µs at 15 K and 5.5 µs at room temperature. A preliminary lifetime analysis suggests that the decrease in lifetime is mainly due to the strong thermalization between the 2H11/2 and 4S3/2 excited states. Nonradiative decay processes are expected to only weakly affect the green luminescence.
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Fujiwara, Yasufumi, Tetsuro Takahashi, Yoshito Fukumoto, Masayoshi Tonouchi et Takeshi Kobayashi. « Radiant Er-Related Luminescence of HighTcSuperconducting Er–Ba–Cu–O System ». Japanese Journal of Applied Physics 26, S3-3 (1 janvier 1987) : 2123. http://dx.doi.org/10.7567/jjaps.26s3.2123.

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Fuhs, W., I. Ulber, G. Weiser, M. S. Bresler, O. B. Gusev, A. N. Kuznetsov, V. Kh Kudoyarova, E. I. Terukov et I. N. Yassievich. « Excitation and temperature quenching of Er-induced luminescence ina-Si:H(Er) ». Physical Review B 56, no 15 (15 octobre 1997) : 9545–51. http://dx.doi.org/10.1103/physrevb.56.9545.

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Kozanecki, A., W. Jantsch, S. Lanzerstorfer, Brian J. Sealy et S. Jackson. « 1.54 μm Luminescence in Er and Er+O Implanted 6H SiC ». Materials Science Forum 258-263 (décembre 1997) : 1545–50. http://dx.doi.org/10.4028/www.scientific.net/msf.258-263.1545.

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26

Kang, Jung-Soo, Kam Tong Leung, Min-Kook Nah, Jung-Sik Shin, Myung-Hyun Kang, Bonggeun Shong, Jun-Gill Kang, Jisuk Lee et Youngku Sohn. « Neighbour-sensitized near-infrared emission of new Nd(iii) and Er(iii) complexes with 1-(anthracene-2-yl)-4,4,4-trifluoro-1,3-butanedione ». New Journal of Chemistry 40, no 11 (2016) : 9702–10. http://dx.doi.org/10.1039/c6nj00999a.

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27

Qin, Xian Peng, Jian Zhang, Hao Yang, De Wei Luo, Jan Ma, Ding Yuan Tang et Shi Wei Wang. « Fabrication and Upconversion Luminescence of Highly Transparent Er:YAG Ceramics ». Solid State Phenomena 185 (février 2012) : 55–59. http://dx.doi.org/10.4028/www.scientific.net/ssp.185.55.

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Highly transparent Er:YAG ceramics with different Er concentration were fabricated by a solid-state reaction and vacuum sintering method. The optical properties, the microstructure and the upconversion luminescence of the Er:YAG ceramics were investigated. For 3 mm thick samples, the in-line transmittances of the as-fabricated Er:YAG ceramics at the wavelength of 1100 nm and 400 nm were about 84% and 82%, respectively, which was very close to the theoretical transmittance of YAG ceramics. The micrograph of the Er:YAG transparent ceramics exhibited a pore-free structure and the average grain size was about 10 μm. The grain boundary of the ceramics was clean and no secondary phase was detected. When pumped by a 980 nm LD, the strong green and red upconversion luminescences in the Er:YAG ceramics were observed. The different upconversion mechanisms depending on Er concentration in the Er:YAG ceramics were also discussed.
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28

Pearton, S. J., C. R. Abernathy, J. D. MacKenzie, U. Hömmerich, X. Wu, R. G. Wilson, R. N. Schwartz, J. M. Zavada et F. Ren. « Luminescence enhancement in AlN(Er) by hydrogenation ». Applied Physics Letters 71, no 13 (29 septembre 1997) : 1807–9. http://dx.doi.org/10.1063/1.119405.

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Sobolev, N. A., O. B. Gusev, E. I. Shek, V. I. Vdovin, T. G. Yugova et A. M. Emel'yanov. « Dislocation-related luminescence in Er-implanted silicon ». Journal of Luminescence 80, no 1-4 (décembre 1998) : 357–61. http://dx.doi.org/10.1016/s0022-2313(98)00129-x.

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30

Grishin, Alexander M., et Sergey I. Khartsev. « Luminescence in epitaxial Er-doped LiNbO_3 films ». Optics Letters 37, no 3 (1 février 2012) : 419. http://dx.doi.org/10.1364/ol.37.000419.

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Ляпин, А. А., П. А. Рябочкина, С. В. Гущин, М. Н. Жарков, А. С. Ермаков, В. М. Кяшкин, С. В. Прытков et А. В. Атанова. « Характеристики апконверсионной люминесценции порошков CaF-=SUB=-2-=/SUB=- : Er при возбуждении лазерным излучением с длиной волны 1.5 μm ». Журнал технической физики 128, no 2 (2020) : 204. http://dx.doi.org/10.21883/os.2020.02.48961.152-19.

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The characteristics of upconversion luminescence of CaF2:Er crystalline powders were investigated upon excitation of Er3+ ions to the 4I13/2 level by laser radiation at 1531.8 nm. The energy yield values of upconversion luminescence were determined for the spectral ranges 380–780 and 380–1100 nm. It was found that upconversion luminescence of CaF2:Er powders with concentrations of 0.5, 2, 4, 6, 8, 10, 11, 13, 15, and 17% of Er3+ ions is characterized by correlated color temperatures of about 5100, 2142, 1726, 1738, 1773, 1757, 1762, 1765, 1735, and 1714 K, respectively.
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32

Рочева, В. В., А. Г. Савельев, А. В. Нечаев, А. Н. Генералова, В. А. Семчишен, А. В. Звягин et Е. В. Хайдуков. « Трехмерная люминесцентная томографическая визуализация биотканей-=SUP=-*-=/SUP=- ». Журнал технической физики 126, no 1 (2019) : 87. http://dx.doi.org/10.21883/os.2019.01.47060.261-18.

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AbstractWe propose a method for obtaining a fluorescence tomographic image for visualization and diagnosis of tissues of a living organism. The method is based on the excitation of the luminescence of multicolor upconverting nanoparticles localized in the depth of the biological tissue or a phantom imitating it by IR light. By recording the changes in the shape of the spectrum of the intensity of luminescence radiation from luminescent nanoparticles on the surface of the tissue, it is possible to obtain information about the depth of their occurrence. To implement this approach, upconverting nanoparticles were synthesized on the base of β-NaYF_4 crystal matrix doped with rare-earth elements Yb^3+, Er^3+, and Tm^3+. The luminescence spectra of the produced nanoparticles upon excitation at a wavelength of 980 nm contain three narrow bands with maxima at wavelengths 540, 655, and 800 nm.
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33

Button, D., et A. Eidsath. « Aequorin targeted to the endoplasmic reticulum reveals heterogeneity in luminal Ca++ concentration and reports agonist- or IP3-induced release of Ca++. » Molecular Biology of the Cell 7, no 3 (mars 1996) : 419–34. http://dx.doi.org/10.1091/mbc.7.3.419.

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A chimeric protein (ERaeq) comprised of the invariant chain (Ii) of class II major histocompatability complex (MHC-II) and aequorin was localized in the endoplasmic reticulum (ER) of transfected human embryonal kidney 293 cells. The targeted aequorin resided in the lumen of the ER membrane system, including the nuclear cistern, and following addition of the chromophore coelenterazine underwent Ca(++)-activated chemiluminescence. The majority of chemiluminescence produced by coelenterazine treatment of ERaeq-expressing 293 cells was consumed rapidly (within 2-4 min) upon re-addition of Ca++ to coelenterazine-loaded cells, a finding consistent with very high Ca++ concentrations (approximately 10(-5)-10(-3) M Ca++ ion) inside the ER. However, following the initial rapid consumption of ERaeq chemiluminescence, the activity that remained (10-30% of total sample luminescence of permeabilized cells or 50-70% of total sample luminescence of intact cells) was found to produce a stable baseline corresponding to a Ca++ ion concentration < or = 1-2 microM. The stable baseline of luminescence observed following rapid consumption of the majority of the sample's activity was not derived from re-binding of fresh chromophore to spent photoprotein, suggesting that a minority fraction of the ER membrane system within which the ERaeq chimera was distributed contained a relatively low Ca++ concentration. Addition of IP3 to digitonin-permeabilized cells, or agonist treatment of intact cells decreased this residual signal. Luminescence recordings from cells expressing an ER-targeted aequorin with relatively high affinity for Ca++ thus reveal heterogeneity in luminal ER Ca++ concentration and permit observation of receptor- and IP3-activated release of Ca++ from the ER membrane system.
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34

Soares, M. R. N., T. Holz, F. Oliveira, F. M. Costa et T. Monteiro. « Tunable green to red ZrO2:Er nanophosphors ». RSC Advances 5, no 26 (2015) : 20138–47. http://dx.doi.org/10.1039/c5ra00189g.

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35

Zharovov, D. A., A. V. Rudakova, A. V. Shurukhina, G. V. Kataeva et V. K. Ryabchuk. « Effect of UV irradiation on photoluminescence of Er3+ ions in matrices of metal oxides and fluorides ». Journal of Physics : Conference Series 2373, no 2 (1 décembre 2022) : 022034. http://dx.doi.org/10.1088/1742-6596/2373/2/022034.

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Abstract A comprehensive study of UV-irradiation of Er-activated solid luminophores on f-f-luminescence of Er3+ions in metal oxide (ZrO2, La2O3) and fluoride (LaF3, YF3) matrices has been carried out. Both increasing (LaF3, YF3), and decreasing (ZrO2, La2O3) of luminescent emission intensity under monochromatic excitation at 377 nm caused by UV irradiation of dispersed samples have been observed. A possible mechanism of the established effect is briefly discussed
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36

Anwand, W., A. Kanjilal, G. Brauer, A. Wagner, M. Butterling, T. E. Cowan, L. Rebohle et W. Skorupa. « Structural Characterisation of Er Implanted, Ge-Rich SiO2 Layers Using Slow Positron Implantation Spectroscopy ». Materials Science Forum 666 (décembre 2010) : 41–45. http://dx.doi.org/10.4028/www.scientific.net/msf.666.41.

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Electroluminescence in SiO2 layers can be created by Ge implantation and a subsequent heat treatment, leading to the formation of Ge nano-particles inside the SiO2. An additional implantation of Er, connected with a further annealing, can lead to an improvement of the luminescent properties. However, the intensity of electroluminescence was found to decrease drastically after exceeding an optimum concentration of the Er doping. Slow positron implantation spectroscopy (SPIS), both in single (DB) and coincidence (CDB) Doppler broadening mode, was applied to probe processes at a microscopic level which might have an impact on the optical response. It shows that the increasing intensity of the electro-luminescence is connected with a crystalline structure of the SiO2 covering the nano-particles and also with the improved reverse energy transfer process between Er and Ge.
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37

Pan, Chun-Yang, Hai-Deng Mai, Wu-Zhou Chen, Feng-Hua Zhao et Hong-Mei Yang. « Synthesis, Structure, and Properties of a New ErIII Iodate ». Australian Journal of Chemistry 67, no 5 (2014) : 763. http://dx.doi.org/10.1071/ch13570.

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A new iodate Er(IO3)3·2H2O was synthesized under mild hydrothermal conditions. The structure has been confirmed by single-crystal X-ray analysis. It crystallizes in the triclinic system with space group P-1 (No.2), a = 7.338(4) Å, b = 7.506(4) Å, c = 9.409(5) Å, α = 79.698(5)°, β = 85.245(4)°, γ = 71.934(4)°, V = 484.5(5) Å3, Z = 2. Some characterizations were performed such as Fourier transform infrared spectroscopy (FTIR), thermogravimetric–differential scanning calorimetry (TG-DSC) analysis, luminescence spectroscopy, and magnetic property measurements. The overall framework of Er(IO3)3·2H2O is based on one-dimensional chains. The adjacent chains are further linked with each other by hydrogen bonds to form a three-dimensional supramolecular network. The luminescent and magnetic properties of Er(IO3)3·2H2O were studied.
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38

Zavada, J. M., Myo Thaik, U. Hömmerich, J. D. MacKenzie, C. R. Abernathy, F. Ren, H. Shen et al. « Luminescence from Erbium-Doped Gallium Nitride Thin Films ». MRS Internet Journal of Nitride Semiconductor Research 4, S1 (1999) : 926–32. http://dx.doi.org/10.1557/s1092578300003616.

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The III-V nitride semiconductors appear to be excellent host materials for optical device applications involving thin films doped with rare earth atoms. In particular, GaN epilayers doped with Er ions have shown a highly reduced thermal quenching of the Er luminescence intensity from cryogenic to elevated temperatures. The remarkable thermal stability of the light emission may be due to the large energy bandgap of the material, as well as to the optical inactivity of material defects in the GaN film. In this paper we present recent developments concerning the luminescence characteristics of Er-doped GaN thins films. We have used two methods for doping GaN films with Er ions, ion implantation and in-situ incorporation during gas source metal-organic molecular beam epitaxy (MOMBE). Bandedge (at ∼ 0.34 µm) and infrared (at ∼ 1.54 µm) photoluminescence (PL) spectra have been measured for both types of Er-doped GaN films. Considerably different emission spectra have been observed depending upon the incorporation method and the heat treatment procedure. In situ Er-doped GaN layers have been processed into hybrid light emitting devices and emission spectra at 1.54 µm have been measured.
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39

Chen, Shaoqiang, Benjamin Dierre, Woong Lee, Takashi Sekiguchi, Shigeo Tomita, Hiroshi Kudo et Katsuhiro Akimoto. « Suppression of concentration quenching of Er-related luminescence in Er-doped GaN ». Applied Physics Letters 96, no 18 (3 mai 2010) : 181901. http://dx.doi.org/10.1063/1.3421535.

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40

Smola, Serhii, Nataliia Rusakova, Olga Snurnikova, Elena Alekseeva et Tatyana Kirichenko. « PECULIARITIES OF STRUCTURE AND SPECTRAL-LUMINESCENT PROPERTIES OF CARBOXYMETHOXY-SUBSTITUTED CALIX[4]ARENES AND THEIR COMPLEXES WITH LANTHANIDES ». Ukrainian Chemistry Journal 86, no 3 (7 avril 2020) : 9–18. http://dx.doi.org/10.33609/0041-6045.86.3.2020.9-18.

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Spectral-luminescent properties of a variety of carboxymethoxy-substituted p-tert-butyl-calix[4]arenes and their complexes with lanthanides (Nd, Er, Yb) that exhibit the 4f-luminescence in the IR-spectrum region have been investigated. The effect of substitution of hydrogen phenolic atoms by carboxymethoxy groups on the stability and spectral-luminescent characteristics of both the ligands and lanthanide complexes was analyzed. Thus, based on the combination of the results obtained by means of elemental analysis, mass spectrometry, IR and 1H NMR spectroscopy, and taking into account the data of pH-metric titration, spectrophotometric and luminescence measurements, it can be concluded that lanthanide ions form neutral complexes of 1:1 ratio with L1H4 - L4H4. This is explained by the presence of mobile hydrogen atoms of phenol and/or carboxyl groups in the molecules of these ligands. An increase in the number of donor substituents leads to changes in the number of solvent molecules in the series L3H4 < L1H4 < L2H4 < L4H4 from 0.8 to 2.4 for neodymium complexes, from 1.2 to 2.2 - for ytterbium complexes. Both the quantum yield and lifetime of the 4f-luminescence of the neodymium and ytterbium complexes and also the luminescence intensity of the erbium-containing compounds change in the same order.
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41

Zhang, Jiayin, Feng Qin, Hua Zhao, Xin Yang, Xitian Zhang, Xuanzhang Wang, Hong Gao, Zhiguo Zhang et Wenwu Cao. « Effects of surroundings on upconversion luminescent properties of rare earth luminescence centers ». CrystEngComm 16, no 43 (2014) : 9974–78. http://dx.doi.org/10.1039/c4ce01441c.

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A special core/shell/shell structured nanoparticle NaYF4/NaYF4:Yb3+,Er3+/NaYF4 was designed and prepared to accurately investigate the effect of surroundings on rare earth centers.
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42

Basyrova, Liza, Pavel Loiko, Abdelmjid Benayad, Gurvan Brasse, Jean-Louis Doualan, Alain Braud, Ammar Hideur et Patrice Camy. « Growth and mid-infrared emission properties of "mixed" fluorite-type Er:(Ca,Sr)F2 and Er:(Ba,Sr)F2 crystals ». EPJ Web of Conferences 266 (2022) : 06001. http://dx.doi.org/10.1051/epjconf/202226606001.

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Fluorite-type 5 at.% Er3+:(M1,M2)F2 (M1 = Ca, Ba; M2 = Sr) crystals were grown by the conventional Bridgman technique and a comparative study of their spectroscopic properties was performed. The vibronic properties of the fluorite-type crystals were studied by Raman spectroscopy. The Er:(M1,M2)F2 crystals exhibited a slightly inhomogeneous broadening of mid-infrared luminescence spectra as compared to the ‘parent’ compound, Er:SrF2. The luminescence lifetimes of the 4I11/2 and 4I13/2 manifolds were measured, e.g., for the Er:(Ca,Sr)F2 crystal, the luminescence lifetimes were estimated to be 8.64 ms and 5.64 ms, respectively, representing a favorable ratio for mid-IR laser operation.
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43

Lis, Stefan, Slawomir But, Andrzej M. Klonkowski et Beata Grobelna. « Spectroscopic studies of Ln(III) complexes with polyoxometalates in solids, and aqueous and non-aqueous solutions ». International Journal of Photoenergy 5, no 4 (2003) : 233–38. http://dx.doi.org/10.1155/s1110662x03000370.

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Chosen polyoxometalate (POM) anions and their lanthanide(III) complexes, LnPOM, have been synthesized and spectroscopically characterized in solid state, aqueous and non-aqueous solutions. POMs, such as Keggin's, Dawson's and Anderson's type,Na9EuW10O36, compositions that function as inorganic cryptands ([(Na)P5W30O110]14−-Preyssler anion, and [(Na)As4W40O140]27−), containing inorganic(Na+,K+,NH4+)or organic (tetrabutylammonium,NBu4+) counter cations were obtained and their Ln(III) complexes (sandwiched and encapsulated) studied. The synthesized compounds were identified using elemental and thermogravimetric analysis, UV-Vis spectrophotometry and FTIR spectroscopy. The complexation studies were carried out with the use Nd(III) and Er(III) optical absorption and Eu(III) luminescence spectroscopy. Luminescence characterization, including results of intensity, quantum yields and luminescence lifetimes of EuPOM complexes in aqueous, non-aqueous solutions (DMF, DMSO, acetonitryle) and solid are discussed. Based on luminescence lifetime measurements of the Eu(III) ion the hydration numbers of its sandwiched (efficient emitters) and encrypted complexes have been determined and quenching effect discussed. The Eu(III) complexes entrapped in a xerogel matrix have been studied as luminescent materials. Luminescence intensity, lifetime and quantum yield of the EuPOM materials and their photochemical stability, during continuous UV irradiation, were tested.
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44

Трепаков, В. А., А. П. Скворцов, Z. Potuvcek, L. Jastrabik et A. Dejneka. « Температурный сдвиг бесфононных f-f-линий люминесценции Er-=SUP=-3+-=/SUP=- в квантовом параэлектрике KTaO-=SUB=-3-=/SUB=- ». Физика твердого тела 62, no 5 (2020) : 800. http://dx.doi.org/10.21883/ftt.2020.05.49252.663.

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Abstract In KTaO_3:Er crystals, we observed a temperature shift, unusual for rare earth impurities, for narrow zero-phonon luminescence lines, due to the ^4 S _3/2 → ^4 I _13/2, ^4 F _9/2 → ^4 I _15/2, and ^4 S _3/2 → ^4 I _15/2 transitions in Er^3+ impurity ions. The magnitude of the shifts turned out to be comparable with the large shifts of the R lines of the Cr^3+ luminescence in SrTiO_3:Cr and KTaO_3:Cr crystals, that is, substantially larger than that for the three-charged rare earth ions usually observed in the f – f luminescence spectra in ionic crystals.
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45

Dissanayake, K. Tauni, et Federico A. Rabuffetti. « Infrared to-visible upconversion luminescence in Er:Yb:SrFBr nanocrystals ». Journal of Materials Chemistry C 4, no 13 (2016) : 2447–51. http://dx.doi.org/10.1039/c5tc04302f.

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The ability of SrFBr nanocrystals codoped with ∼1 mol% of Er3+ and Yb3+ to perform infrared-to-visible light upconversion is demonstrated. Excitation of Yb3+ at 980 nm results in two-photon upconversion and green-yellow luminescence from Er3+, highlighting the potential of alkaline-earth fluorohalides as hosts for Yb3+–Er3+ sensitizer–activator pairs.
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46

Uddin, Rahim, Jianxiang Wen, Tao He, Fufei Pang, Zhenyi Chen et Tingyun Wang. « Ultraviolet Irradiation Effects on luminescent Centres in Bismuth-Doped and Bismuth-Erbium Co-Doped Optical Fibers via Atomic Layer Deposition ». Electronics 7, no 10 (18 octobre 2018) : 259. http://dx.doi.org/10.3390/electronics7100259.

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The effects of ultraviolet irradiation on luminescent centres in bismuth-doped (BDF) and bismuth/erbium co-doped (BEDF) optical fibers were examined in this study. The fibers were fabricated by modified chemical vapor deposition combining with atomic layer deposition method. The fibers were exposed to irradiation from a 193 nm pulsed wave argon fluoride laser, and an 830 nm wavelength laser diode pump source was employed for excitation. The experimental results showed that, for the BDF, the transmission loss was slightly reduced and the luminescence intensity was increased at the bismuth-related active aluminum centre (BAC-Al). Then, for the BEDF, the transmission loss was increased a little and the luminescence intensity was also increased at the BAC-Al centre. However, the luminescence intensity was decreased at approximately 1420 nm of the bismuth-related active silica centre (BAC-Si) for all fiber samples. One possible formation mechanism for luminescence intensity changes was probably associated with the valence state transfer of bismuth ions. The other possible mechanism was that the ArF-driven two-photon process caused luminescence changes in BAC-Al and BAC-Si. It was very important to reveal nature of luminescence properties of Bi-doped and Bi/Er co-doped optical fiber.
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47

Ge, Xiao, Qingfeng Guo, Qianqian Wang, Tao Li et Libing Liao. « Mineralogical Characteristics and Luminescent Properties of Natural Fluorite with Three Different Colors ». Materials 15, no 6 (8 mars 2022) : 1983. http://dx.doi.org/10.3390/ma15061983.

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Fluorite is rich in mineral resources and its gorgeous colors and excellent luminescence characteristics have attracted the attention of many scholars. In this paper, the composition, structure, luminescent properties, and the potential application value of three fluorites with different colors and are systematically analyzed. The results show that REE and radioactive elements have effects on the structure, color, and luminescence of fluorite. Radioactive elements Th and U will aggravate the formation of crystal defects in fluorite. The green color is related to Ce3+ and Sm2+. Colloidal calcium and F− center are responsible for the blue-purple color of fluorite. There are many luminescent centers, such as Eu, Pr, Dy, Tb, Er, and Sm, in fluorite. The blue fluorescence is mainly caused by 4f7-4f65d1 of Eu2+. In addition, it is found that fluorite has certain temperature sensing properties in the temperature range of 303–343 K.
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48

Liu, Wenjia, Guixia Liu, Jinxian Wang, Xiangting Dong et Wensheng Yu. « A new strategy to directly construct hybrid luminescence–photothermal–magnetism multifunctional nanocomposites for cancer up-conversion imaging and photothermal therapy ». RSC Advances 6, no 4 (2016) : 3250–58. http://dx.doi.org/10.1039/c5ra23632k.

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Novel hybrid Ag/NaGdF4:Yb3+,Er3+ multifunctional nanocomposites with luminescence–photothermal–magnetism properties have great promise in future up-conversion luminescence imaging and photothermal therapy of tumors.
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Shalygina, Olga A., Denis M. Zhigunov, Dmitrii A. Palenov, Victor Timoshenko, Pavel K. Kashkarov, M. Zacharias et Paul M. Koenraad. « Population Dynamics of Excitons in Silicon Nanocrystals Structures under Strong Optical Excitation ». Advanced Materials Research 31 (novembre 2007) : 196–98. http://dx.doi.org/10.4028/www.scientific.net/amr.31.196.

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We report on the experimental and theoretical studies of population/depopulation dynamics of excitons in the structures with Si nanocrystals in SiO2 matrix (nc-Si/SiO2) under strong optical excitation. The experimental results are explained using a phenomenological model based on rate equations for coupled system of energy donors (excitons) and energy acceptors (erbium ions). Exciton luminescence is found to exhibit superlinear dependence for Er-doped samples. At the same time the Er-related luminescence at 1.5 μm shows a saturation of the intensity and shortening of the lifetime, which are attributed to the population inversion of the Er ions states. The obtained results demonstrate that nc-Si/SiO2:Er systems can be used for applications in Si-based optical amplifiers and lasers, compatible with planar Si-technology.
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Bai, Jingyi, Pingping Duan, Xin Wang, Gui Han, Min Wang et Guowang Diao. « Upconversion luminescence enhancement by Fe3+ doping in CeO2:Yb/Er nanomaterials and their application in dye-sensitized solar cells ». RSC Advances 10, no 32 (2020) : 18868–74. http://dx.doi.org/10.1039/d0ra02308f.

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