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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Liu C., Xia, Zhiguo, Chen M., Molokeev M. S., Liu Q.
Заглавие : Near-infrared luminescence and color tunable chromophores based on Cr3+-Doped Mullite-Type Bi2(Ga,Al)4O9 solid solutions
Место публикации : Inorg. Chem.: American Chemical Society, 2015. - Vol. 54, Is. 4. - P.1876-1882. - ISSN 0020-1669, DOI 10.1021/ic502779d
Примечания : Cited References: 26. - The present work was supported by the National Natural Science Foundations of China (Grants 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: PERSISTENT LUMINESCENCE
PHOSPHORS
PIGMENT
GARNET
OXIDES
FIELD
RED
Аннотация: Cr3+-activated mullite-type Bi2Ga(4-x)AlxO9 (x = 0, 1, 2, 3, and 4) solid solutions were prepared by the solid state reaction, and their spectroscopic properties were investigated in conjunction with the structural evolution. Under excitation at 610 nm, Bi2[Ga(4-y)Aly]3.97O9:0.03Cr3+ (y = 0, 1, 2, 3, and 4) phosphors exhibited broad-band near-infrared (NIR) emission peaking at ?710 nm in the range 650?850 nm, and the optimum Cr3+ concentrations and concentration quenching mechanism were determined. Except for the interesting NIR emission, the body color changed from white (at x = 0) to green (at x = 0.08) for Bi2Ga4?xO9:xCr3+, and from light yellow (at x = 0) to deep brown (at x = 0.08) for Bi2Al4?xO9:xCr3+, respectively. Moreover, as a result of variable Al/Ga ratio, the observed body color for Bi2[Ga(4-y)Aly]3.97O9:0.03Cr3+ (y = 0, 1, 2, 3, and 4) varied from deep brown to green. The relationship between the observed colors and their diffuse reflectance spectra were also studied for the understanding of the different absorption bands. The results indicated that Cr3+-doped Bi2Ga(4-x)AlxO9 solid solutions appeared as the bifunctional materials with NIR phosphors and color-tunable pigments.
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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) : Lim C. S., Atuchin V. V., Aleksandrovsky A. S., Molokeev M. S.
Заглавие : Preparation of NaSrLa(WO4)3:Ho3+/Yb3+ ternary tungstates and their upconversion photoluminescence properties
Место публикации : Mater. Lett.: Elsevier, 2016. - Vol. 181. - P.38-41. - ISSN 0167577X (ISSN), DOI 10.1016/j.matlet.2016.05.121
Примечания : Cited References: 24. - This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2015-058813), SB RAS Program No.II.2P (No. 0358-2015-0012) and Russian Foundation for Basic Research (15-52-53080).
Предметные рубрики: VIBRATIONAL PROPERTIES
LUMINESCENCE PROPERTIES
MODULATED STRUCTURE
PHOSPHORS
CRYSTAL
RED
Ключевые слова (''Своб.индексиров.''): tungstate--phosphor--sol-gel preparation--luminescence--raman spectroscopy--xrd
Аннотация: NaSrLa1-x(WO4)3:Ho3+/Yb3+ ternary tungstates were synthesized via microwave sol-gel route. Well-crystallized particles with particle sizes of 2-5 ?m were obtained after heat-treatment at 900 °C for 16 h. Under the excitation at 980 nm, the particles showed yellow emissions based on the strong 545 and 655 nm emission bands. The preferable Yb3+:Ho3+ ratio was obtained to be 9:1. Raman spectra of the doped particles indicated the presence of strong Ho3+ luminescence lines. The pump power dependence and Commission Internationale de L'Eclairage chromaticity of the upconversion emission intensity were evaluated. © 2016 Published by Elsevier B.V.
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