Перевод заглавия: Переопределение кристаллической структуры La3BWO9:Bi3+ и желтая люминесценция с сильным возбуждением в области близкой к ультрафиолету в это люминофоре для белых светодиодов
Кл.слова (ненормированные):
Bi3+ luminescence -- borotungstates -- crystal structure -- WLEDs -- X-ray diffraction -- yellow phosphor
Аннотация: Bi3+-activated photonic materials have received increased interest recently because they can be excited effectively with near-ultraviolet (NUV) but not visible light, thereby avoiding the reabsorption among phosphors, which cannot be solved intrinsically by traditional rare earth (e.g., Eu2+, Ce3+) phosphors. Such unique property suggests their potential application in NUV chip-based WLEDs. However, few Bi3+ phosphors exhibit strong excitation peak in NUV, though the excitation tail of some can extend to NUV. Herein, we report a novel yellow-emitting La3BWO9:Bi3+ (LBW:Bi3+) phosphor with strong NUV excitation. The photoluminescence (PL) spectroscopy analysis indicates that there are two Bi3+ luminescent centers in LBW:Bi3+ phosphor, which is clearly in contradiction with the established hexagonal structure of La3BWO9 with P63 space group because only one La site in this structure can accommodate Bi3+ ions. Combining the luminescent properties of Bi3+ with Rietveld refinement, La3BWO9 was redefined as a trigonal structure with the lower space group of P3 in which there are two independent crystallographic La sites. In addition, the rationalization of P3 space group was further confirmed by the finding of the reflection (0001) according to the extinction rule. Therefore, the PL behavior of Bi3+ can act as a complementary tool to determinate the real crystal structure especially when it is hard to distinguish by conventional X-ray diffraction techniques.
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Держатели документа:
State Key Laboratory of Luminescent Materials and Devices, Guangdong Eng. Technol. R. and D. Center of Special Optical Fiber Materials and Devices, Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, School of Materials Science and Engineering, South China University of Technology, Guangzhou, China
College of Chemistry and Molecular Engineering, Peking University, Beijing, China
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russian Federation
Department of Physics, Far Eastern State Transport University, Khabarovsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation
School of Chemistry, Sun Yat-Sen University, Guangzhou, China
Доп.точки доступа:
Han, J.; Pan, F.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Dai, J.; Peng, M.; Zhou, W.; Wang, J.