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Structures and luminescence properties of Yb3＋ in the double perovskites Ba2YB＇O6 （B＇=Ta5＋, Nb5＋） phosphors

ISSN号：1674-1056
期刊名称：《中国物理B：英文版》
时间：0
分类：O734[理学—晶体学] TN248.1[电子电信—物理电子学]
作者机构：[1]Anhui Provincial Key Laboratory of Photonic Devices and Materials, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China, [2]Graduate School of the Chinese Academy of Sciences, Beijing 100049, China
相关基金：Project supported by the National Natural Science Foundation of China （Grant Nos. 50772112, 90922003, and 50872135）, Provincial Natural Science Fund of Anhui, China （Grant No. 08040106820）, and the Knowledge Innovation Program of the Chinese Academy of Sciences （Grant No. YYYJ-1002）.

作者：周文龙[1,2], 张庆礼[1], 高进云[1,2], 刘文鹏[1], 丁丽华[1,2], 殷绍唐[1]

关键词：镱掺杂, 荧光粉, 发光性质, 双钙钛矿, 结构, RIETVELD方法, 高温固相反应法, 能量水平, luminescence properties, Yb3＋, Ba2YTaO6, Ba2YNbO6

中文摘要：

The Yb 3+ doped Ba 2 YB O 6 (B=Ta 5+,Nb 5+) were prepared by high temperature solid-state reaction method,their structures were determined by x-ray diffraction and refined by Rietveld method.The diffuse reflection absorption,excitation and emission spectra of Yb 3+:Ba 2 YB O 6 (B=Ta 5+,Nb 5+) were measured at room temperature.Under the excitation of ultraviolet light,these phosphors exhibit broad charge transfer band emissions of TaO 6 or NbO 6 centre with large Stokes shift.The Yb 3+ doped into these hosts are situated at Y 3+ sites of cubic symmetry (O h).The experimental energy levels of Yb 3+ in Ba 2 YTaO 6 and Ba 2 YNbO 6 were determined by photoluminescence and diffuse reflection absorption spectra.Their wavefunctions and theoretical energy levels were obtained by diagonalising the Hamiltonian matrix.The experimental energy levels were fitted by Levenberg-Marquardt iteration algorithm to determine crystal field parameters.Then,the magnetic-pole transition line strengths of Yb 3+:Ba 2 YB O 6 (B =Ta 5+,Nb 5+) from (2 F 5/2)Γ 8 to the low-energy states were calculated.

英文摘要：

The Yb3＋ doped Ba2YB＇O6 （B＇= Ta5＋, Nb5＋） were prepared by high temperature solid-state reaction method, their structures were determined by x-ray diffraction and refined by Rietveld method. The diffuse reflection absorption, excitation and emission spectra of yb3＋：Ba2YB＇O6 （B＇= Ta5＋, Nb5＋） were measured at room temperature. Under the excitation of ultraviolet light, these phosphors exhibit broad charge transfer band emissions of TaO6 or NbO6 centre with large Stokes shift. The Yb3＋ doped into these hosts are situated at y3＋ sites of cubic symmetry （Oh）. The experimental energy levels of Yb3＋ in Ba2YTaO6 and Ba2YNbO6 were determined by photoluminescence and diffuse reflection absorption spectra. Their wavefunctions and theoretical energy levels were obtained by diagonalising the Hamiltonian matrix. The experimental energy levels were fitted by Levenberg-Marquardt iteration algorithm to determine crystal field parameters. Then, the magnetic-pole transition line strengths of yb3＋：Ba2YB＇O6 （B＇=Ta5＋, Nb5＋） from （2F5/2）Г8-to the low-energy states were calculated.

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