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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Xia Z., Liu G., Wen J., Mei Z., Balasubramanian M., Molokeev M. S., Peng L., Gu L., Miller D. J., Liu Q., Poeppelmeier K. R.
Заглавие : Tuning of photoluminescence by cation nanosegregation in the (CaMg)x(NaSc)1-xSi2O6 solid solution
Место публикации : J. Am. Chem. Soc.: American Chemical Society, 2016. - Vol. 138, Is. 4. - P.1158-1161. - ISSN 00027863 (ISSN), DOI 10.1021/jacs.5b12788
Примечания : Cited References: 23. - Work performed by Z.X. and Q.L. was supported by the National Natural Science Foundation of China (51272242 and 51572023), the Program for New Century Excellent Talents in the University of the Ministry of Education of China (NCET-12-0950), and the Beijing Nova Program (Z131103000413047). Work performed by G.L., J.W., Z.M., M.B., and D.J.M. at Argonne National Laboratory was supported by the Office of Basic Energy Sciences of the U.S. Department of Energy (DOE) through Grant DE-AC02-06CH11357 for research on heavy elements chemistry and materials sciences. TEM was accomplished in part at the Center for Nanoscale Materials, a DOE Office of Science User Facility under Contract DE-AC02-06CH11357. Sector 20 operations at APS are supported by DOE and the Canadian Light Source, with additional support from the University of Washington. G.L. acknowledges travel support from the CAS/SAFEA International Partnership Program for Creative Research Teams. K.R.P. gratefully acknowledges support from the National Science Foundation (DMR-1307698).
Предметные рубрики: SPINODAL DECOMPOSITION
ENERGY-TRANSFER
EXSOLUTION
CLINOPYROXEN
NANOCRYSTALS
SEGREGATION
MECHANISMS
PYROXENESS
JERVISITE
PHOSPHORS
Аннотация: Controlled photoluminescence tuning is important for the optimization and modification of phosphor materials. Herein we report an isostructural solid solution of (CaMg)x(NaSc)1-xSi2O6 (0 < x < 1) in which cation nanosegregation leads to the presence of two dilute Eu2+ centers. The distinct nanodomains of isostructural (CaMg)Si2O6 and (NaSc)Si2O6 contain a proportional number of Eu2+ ions with unique, independent spectroscopic signatures. Density functional theory calculations provided a theoretical understanding of the nanosegregation and indicated that the homogeneous solid solution is energetically unstable. It is shown that nanosegregation allows predictive control of color rendering and therefore provides a new method of phosphor development. © 2016 American Chemical Society.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Liu, Chengyin, Xia, Zhiguo, Molokeev M. S., Liu, Quanlin
Заглавие : Synthesis, crystal structure, and enhanced luminescence of garnet-type Ca3Ga2Ge3O12:Cr3+ by codoping Bi3+
Место публикации : J. Am. Ceram. Soc.: Wiley-Blackwell, 2015. - Vol. 98, Is. 6. - P.1870-1876. - ISSN 0002, DOI 10.1111/jace.13553. - ISSN 15512916(eISSN)
Примечания : Cited References:24. - This work was supported by the National Natural Science Foundations of China (grant nos. 51002146, 51272242), Natural Science Foundations of Beijing (2132050), the Program for New Century Excellent Talents in University of Ministry of Education of China (NCET-12-0950), Beijing Nova Program (Z131103000413047), Beijing Youth Excellent Talent Program (YETP0635), the Funds of the State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University (KF201306) and Fundamental Research Funds for the Central Universities (FRF-TP-14-005A1).
Предметные рубрики: LIGHT-EMITTING-DIODES
INFRARED PERSISTENT LUMINESCENCE
ENERGY-TRANSFER
PHOSPHOR
RED
NANOPARTICLES
EFFICIENCY
Аннотация: Garnet-type compound Ca3Ga2Ge3O12 and Cr3+-doped or Cr3+/Bi3+ codped Ca3Ga2Ge3O12 phosphors were prepared by a solid-state reaction. The crystal structure of Ca3Ga2Ge3O12 host was studied by X-ray diffraction (XRD) analysis and further determined by the Rietveld refinement. Near-infrared (NIR) photoluminescence (PL) and long-lasting phosphorescence (LLP) emission can be observed from the Cr3+-doped Ca3Ga2Ge3O12 sample, and the enhanced NIR PL emission intensity and LLP decay time can be realized in Cr3+/Bi3+ codped samples. The optimum concentration of Cr3+ in Ca3Ga2Ge3O12 phosphor was about 6 mol%, and optimum Bi3+ concentration induced the energy-transfer (ET) process between Bi3+ and Cr3+ ions was about 30 mol%. Under different excitation wavelength from 280 to 453 nm, all the samples exhibit a broadband emission peaking at 739 nm and the intensity of NIR emission increases owing to the ET behavior from Bi3+ to Cr3+ ions. The critical ET distance has been calculated by the concentration-quenching method. The thermally stable luminescence properties were also studied and the introduction of Bi3+ can also improve the thermal stability of the NIR emission.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Atuchin V. V., Yelisseyev A. P., Galashov E. N., Molokeev M. S.
Заглавие : Synthesis and luminescence properties of Li2O–Y2O3–TeO2:Eu3+ tellurite glass
Коллективы : Ministry of Education and Science of the Russian Federation
Место публикации : Mater. Chem. Phys.: Elsevier Science, 2014. - Vol. 147, Is. 3. - P.1191-1194. - ISSN 0254-0584, DOI 10.1016/j.matchemphys.2014.07.003. - ISSN 1879-3312
Примечания : Cited References: 26. - This study is partly supported by the Ministry of Education and Science of the Russian Federation.
Предметные рубрики: LIGHT-EMITTING-DIODES
SPECTROSCOPIC PROPERTIES
OPTICAL-PROPERTIES
ENERGY-TRANSFER
CERAMICS
Eu3+
PHOTOLUMINESCENCE
TEMPERATURE
EMISSION
PHOSPHOR
Ключевые слова (''Своб.индексиров.''): glasses--heat treatment--photoluminescence spectroscopy--optical properties
Аннотация: The Eu3+-doped red-orange emitting phosphor of tellurite glass 0.25Li2O–0.20Y2O3–0.5TeO2–0.05Eu2O3 has been synthesized by the melt quenching method. The amorphous nature of the glass has been verified by XRD measurements. The photoluminescence excitation and emission spectra, the luminescence decay curves have been investigated for the composition. The phosphor can be efficiently excited by the near UV light to realize the intense narrow red emission line (611 nm) corresponding to forced electric dipole transition 5D0 → 7F2 of Eu3+ ions. The Li2O–Y2O3–TeO2:Eu3+glass phosphor is a potential red-orange emitting candidate for the application in WLEDs.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Yu, Shixin, Xia, Zhiguo, Molokeev M. S., Miao, Hao, Atuchin V. V.
Заглавие : Synthesis and luminescence properties of blue-emitting phosphor Li3c2(PO4)3:Er2+
Место публикации : ECS J. Solid State Sci. Technol. - 2014. - Vol. 3, Is. 8. - P.R159-R163. - ISSN 2162-8769, DOI 10.1149/2.0071408jss. - ISSN 2162-8777
Примечания : Cited References: 33. - The present work was supported by the National Natural Science Foundations of China (Grant No. 51002146, No. 51272242), Natural Science Foundations of Beijing (2132050), the Program for New Century Excellent Talents in the University of the Ministry of Education of China (NCET-12-0950), Beijing Nova Program (Z131103000413047), Beijing Youth Excellent Talent Program (YETP0635) and the Funds of the State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University (KF201306). Z. G. Xia is also grateful for the financial support from University of Science and Technology Beijing. V.V.A. gratefully acknowledge the Ministry of Education and Science of the Russian Federation for the financial support.
Предметные рубрики: ENERGY-TRANSFER
PHOTOLUMINESCENCE PROPERTIES
INORGANIC-COMPOUNDS
EMISSION COLOR
FULL-COLOR
DIODES
Eu2+
IONS
LEDS
Tb
Аннотация: A new blue-emitting phosphor Li3Sc2(PO4)3:Eu2+ was synthesized by a high temperature solid-state reaction method, and the crystal structure and photoluminescence properties were investigated in detail. The preferred crystallographic position of the Eu2+ ions in the Li3Sc2(PO4)3 host were determined from the structural analysis and spectroscopic properties. The as-prepared phosphor gave an intense blue emission band centered at 439 nm with the CIE coordinate of (0.1540, 0.0317) upon the excitation of the near ultraviolet light. The critical quenching concentration of Eu2+ in Li3Sc2(PO4)3:Eu2+ was about 15 mol%, and the corresponding concentration quenching mechanism was verified to be the dipole-quadrupole interaction. The fluorescence lifetime of Eu2+ emission and the thermal stable luminescence property have been investigated. Li3Sc2(PO4)3:Eu2+ was found to be a promising candidate as a blue-emitting n-UV convertible phosphor for the application in white light emitting diodes (w-LEDs).
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Su, Binbin, Molokeev M. S., Xia, Zhiguo
Заглавие : Unveiling Mn2+ dopant states in two-dimensional halide perovskite toward highly efficient photoluminescence
Место публикации : J. Phys. Chem. Lett. - 2020. - Vol. 11, Is. 7. - P.2510-2517. - ISSN 1948-7185, DOI 10.1021/acs.jpclett.0c00593
Примечания : Cited References: 49. - This work is supported by the National Natural Science Foundation of China (51961145101, 51972118, and 51722202), Fundamental Research Funds for the Central Universities (D2190980), the Guangdong Provincial Science & Technology Project (2018A050506004), and the Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program (2017BT01X137). This work is also funded by RFBR according to the research project no. 19-52-80003.
Предметные рубрики: LEAD BROMIDE PEROVSKITES
ENERGY-TRANSFER
EXCITON DYNAMICS
DOPING MN2+
Аннотация: Doping is able to create novel optoelectronic properties of halide perovskites, and the involved mechanism of efficient emission is still a challenge. Herein Mn2+ substitution into 2D layered perovskites (C8H20N2)PbBr4 was investigated, demonstrating broad-band orange-red emission originating from the 4T1 → 6A1 transition of Mn2+ dopant. The photoluminescence quantum yield (PLQY) of Mn2+ emission is up to 60.8% related to the energy transfer in coupled states. We verify that an actual Mn2+ dopant as low as 0.476% reaches a high PLQY, whereas the nominal adding amount is 0.8 as the Mn2+/Pb2+ ratio. The small activation energy (∼6.72 meV) between the Mn2+ d state and the trap state accounts for this highly efficient energy transfer and photoluminescence. The proposed luminescence mechanism in Mn2+-doped 2D halide perovskites would provide unique insights into the doping design toward high-performance luminescence materials.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zhou, Guojun, Jia, Xiaofang, Guo, Shaoqiang, Molokeev M. S., Zhang, Junying, Xia, Zhiguo
Заглавие : Role of Halogen Atoms on High-Efficiency Mn2+ Emission in Two-Dimensional Hybrid Perovskites
Место публикации : J. Phys. Chem. Lett. - 2019. - Vol. 10, Is. 16. - P.4706-4712. - ISSN 1948-7185, DOI 10.1021/acs.jpclett.9b01996
Примечания : Cited References: 37. - This work is supported by the National Natural Science Foundation of China (No. 51722202 and 51572023), the Natural Science Foundations of Beijing (2172036), the Fundamental Research Funds for the Central Universities (FRF-TP-18-002C1), and the Guangdong Provincial Science & Technology Project (No. 2018A050506004).
Предметные рубрики: ENERGY-TRANSFER
LIGHT-EMISSION
DOPING MN2+
LEAD-FREE
NANOCRYSTALS
Аннотация: Doped halide pervoskites as highly efficient light emitters have recently fascinated the research community, while the influence of halogen atoms X (X = Cl, Br, I) on the hybrid energy levels and photoluminescence properties remains a challenge. Here, the role of X compositions in the two-dimensional hybrid perovskite BA2PbX4 (BA = C4H9NH3) on the doped Mn2+ emission is identified, wherein Mn2+ reveals a strong luminescence dependence on the nature of the halogen, and optimum Mn2+ emission with a record quantum yield of 60.1% has been achieved in BA2PbBr4. Density functional theory calculations show that BA2PbBr4 holds low Br vacancy concentration and unique coupled states of the Mn-3d level and Pb-6p level at the conduction band minimum, leading to efficient energy transfer from the host to Mn2+. Our work sheds new light on the methods to realize strong exciton–dopant exchange coupling for achieving high-efficiency dopant luminescence.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Yin, Mengyan, Liu, Yangai, Mei, Lefu, Molokeev M. S., Huang, Zhaohui, Fang, Minghao
Заглавие : Preparation, crystal structure and up-conversion luminescence of Er3+, Yb3+ co-doped Gd2(WO4)3
Место публикации : RSC Adv.: Royal Society of Chemistry, 2015. - Vol. 5, Is. 89. - P.73077-73082. - ISSN 2046-2069, DOI 10.1039/c5ra12959a
Примечания : Cited References: 43. - The present work was supported by the National Natural Science Foundations of China (Grant No. 51472223), the Fundamental Research Funds for the Central Universities (Grant No. 2652015008), and New Century Excellent Talents in University of Ministry of Education of China (Grant No. NCET-12-0951).
Предметные рубрики: HYDROTHERMAL SYNTHESIS
ENERGY-TRANSFER
RED PHOSPHORS
NANOCRYSTALS
EMISSION
GREEN
HO
TEMPERATURE
TUNGSTATES
TM
Аннотация: Up-conversion (UC) phosphors Gd2(WO4)3:Er3+/Yb3+ were synthesized by a high temperature solid-state reaction method. The crystal structure of Gd2(WO4)3:3% Er3+/10% Yb3+ was refined by Rietveld method and it was showed that Er3+/Yb3+ were successfully doped into the host lattice replacing Gd3+. Under 980 nm laser excitation, intense green and weak red emissions centered at around 532 nm, 553 nm, and 669 nm were observed, which were assigned to the Er3+ ion transitions of 4H11/2 → 4I15/2, 4S3/2 → 4I15/2 and 4F9/2 → 4I15/2, respectively. The optimum Er3+ doping concentration was determined as 3 mol% when the Yb3+ concentration was fixed at 10 mol%. The pump power study indicated that the energy transfer from Yb3+ to Er3+ in Er3+, Yb3+ co-doped Gd2(WO4)3 was a two-photon process, and the related UC mechanism of energy transfer was discussed in detail. This journal is © The Royal Society of Chemistry.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zhang L., Fang M., Huang Z., Liu Y., Min X., Tang H., Chen K., Guan M., Molokeev M. S.
Заглавие : Preparation and luminescence properties of the blue-emitting phosphor BaBPO5:Eu2+
Место публикации : Sci. Adv. Mater. - 2016. - Vol. 8, Is. 5. - P.1086-1092. - ISSN 19472935 (ISSN), DOI 10.1166/sam.2016.2704
Примечания : Cited References: 22. - This work was financially supported by the National Natural Science Foundation of China (NSFC Grant no. 51172216) and the Fundamental Research Funds for the Central Universities (Grant no. 2652015022).
Предметные рубрики: Energy-transfer
Diodes
Ions
Eu3+
Photoluminescence
Reduction
Tb3+
Ключевые слова (''Своб.индексиров.''): babpo5--eu2+--phosphor--white light emitting diodes
Аннотация: Blue-emitting BaBPO5:xEu2+ phosphors were prepared by a high-temperature solid-state reaction route. The crystal phase, luminescence properties, lifetime, and thermal stability were investigated, respectively. The phase analysis indicated that BaBPO5 crystallize with the structure of stillwellite-type compounds. Under the excitation at 310 nm, the phosphor exhibited an asymmetric broad-band blue emission with peak at 410 nm, which was ascribed to the 4f-5d transition of Eu2+. It was further calculated that the dipole-dipole interactions were responsible for a concentration quenching effect in BaBPO5:xEu2+ phosphors at x = 0.08. The lifetime decreased with the increasing concentration of Eu2+ ions. The temperature-dependent emission spectra indicated an excellent thermal stability of the BaBPO5:0.08Eu2+ samples. Surface morphology and CIE coordinate were also investigated. All the properties assessed indicated that the developed blue-emitting BaBPO5:Eu2+ phosphor is a good candidate for application in white-light emitting diodes. © 2016 by American Scientific Publishers.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pustovarov V. A., Ogorodnikov I. N., Omelkov S. I., Molokeev M. S., Kozlov A. V., Isaenko L. I.
Заглавие : Photoluminescence of monoclinic Li3AlF6 crystals under vacuum ultraviolet and soft X-ray excitations
Место публикации : Opt. Mater.: Elsevier, 2015. - Vol. 49. - P.201-207. - ISSN 0925-3467, DOI 10.1016/j.optmat.2015.09.011
Примечания : Cited References: 49. - This work was partly supported by the Ministry of Education and Science of the Russian Federation (the basic part of the government mandate); Center of Excellence "Radiation and Nuclear Technologies" (Competitiveness Enhancement Program of Ural Federal University, Russia), HASYLAB DESY (Projects Nos. 20110843, 20080119EC), European Social Fund ("Mobilitas" program, MJD219), Estonian Research Council (Institutional Research Funding IUT02-26) and Baltic Science Link project coordinated by the Swedish Research Council, VR
Предметные рубрики: LiBaAlF6 single-crystals
F-type centers
LiBaF3 crystals
Color-centers
Recombination luminescence
Rietveld refinement
VUV spectroscopy
Trapped excitons
Energy-transfer
Pure
Ключевые слова (''Своб.индексиров.''): li3alf6--time-resolved luminescence--vuv spectroscopy--defects
Аннотация: Using Bridgman technique we have grown monoclinic β-LiAF crystals suitable for optical studies, performed XRD-identification and Rietveld refinement of the crystal structure and carried out a photoluminescence study upon vacuum ultraviolet (VUV) and extreme ultraviolet (XUV)-excitations, using the low-temperature (T = 7.2 K) time-resolved VUV-spectroscopy technique. The intrinsic PL emission band at 340–350 nm has been identified as due to radiative recombination of self-trapped excitons. The electronic structure parameters were determined: bandgap E g ≈ 12.5 eV, energy threshold for creation of unrelaxed excitons 11.8 eV < E n < 12.5 eV . The PL emission bands at 320–325 and 450 nm were attributed to luminescence caused by lattice defects. We have discovered an efficient excitation of PL emission bands in the energy range of interband transitions ( E ex > 13.5 eV), as well as in the energy range of core transitions at 130 eV. We have revealed UV–VUV PL emission bands at 170 and 208 nm due to defects. A reasonable assumptions about the origin of the UV–VUV bands were discussed.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zhou, Guojun, Jiang, Xingxing, Molokeev M. S., Lin, Zheshuai, Zhao, Jing, Wang, Jing, Xia, Zhiguo
Заглавие : Optically Modulated Ultra-Broad-Band Warm White Emission in Mn2+-Doped (C6H18N2O2)PbBr4 Hybrid Metal Halide Phosphor
Место публикации : Chem. Mater. - 2019. - Vol. 31, Is. 15. - P.5788-5795. - ISSN 0897-4756, DOI 10.1021/acs.chemmater.9b01864. - ISSN 1520-5002(eISSN)
Примечания : Cited References: 47. - This work is supported by the National Natural Science Foundation of China (nos. 51722202 and 51572023), Natural Science Foundations of Beijing (2172036), the Fundamental Research Funds for the Central Universities (FRF-TP-18-002C1), and the Guangdong Provincial Science & Technology Project (no. 2018A050506004).
Предметные рубрики: LIGHT EMISSION
PEROVSKITE NANOCRYSTALS
ENERGY-TRANSFER
STATE
Br
Аннотация: Finding new low-dimensional metal halides with broad-band emission is attracting interest in single-component phosphor for white light-emitting diodes (WLEDs). The full-spectrum white light still remains a challenge as found in the two-dimensional hybrid material (C6H18N2O2)PbBr4 exhibiting the intrinsic free exciton (FE) and broad-band self-trap exciton (STE) emission upon 365 nm ultraviolet excitation, and a combined strategy has been proposed through doping the Mn2+ ions enabling a superposition of multiple emission centers toward the ultra-broad-band warm white light. The occupation of Mn2+ in (C6H18N2O2)PbBr4 has been discussed, and optical investigations verify that the warm white-light emission of Mn2+-doped (C6H18N2O2)PbBr4 originates from the coupling effects of the FE, STEs, and the 4T1–6A1 transition of the doped Mn2+. When the concentration of Mn2+ is 5%, the emission spectrum of the phosphor covers all visible-light areas with a full width at half maximum (FWHM) of about 230 nm. The high Ra (84.9) and warm light CCT (3577 K) values of the as-fabricated WLED lamp demonstrate that (C6H18N2O2)Pb1–xMnxBr4 can be promising as single-component white-light phosphor in solid-state lighting. Our work could provide a new understanding and perspective about hybrid metal halides for designing superior phosphor toward single-component white emission.
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