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Structures and luminescence properties of Yb3+ in the double perovskites Ba2YB'O6 (B'=Ta5+, Nb5+) phosphors |
| Zhou Wen-Long(周文龙)a)b), Zhang Qing-Li(张庆礼) a)†, Gao Jin-Yun(高进云)a)b), Liu Wen-Peng(刘文鹏)a), Ding Li-Hua(丁丽华) a)b), and Yin Shao-Tang(殷绍唐)a) |
| a Anhui Provincial Key Laboratory of Photonic Devices and Materials, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China; b Graduate School of the Chinese Academy of Sciences, Beijing 100049, China |
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Abstract 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)$\varGamma$8- to the low-energy states were calculated.
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Received: 05 June 2010
Revised: 28 July 2010
Accepted manuscript online:
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PACS:
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61.10.Nz
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71.70.Ch
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(Crystal and ligand fields)
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78.55.-m
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(Photoluminescence, properties and materials)
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75.10.Dg
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(Crystal-field theory and spin Hamiltonians)
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| Fund: 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). |
Cite this article:
Zhou Wen-Long(周文龙), Zhang Qing-Li(张庆礼), Gao Jin-Yun(高进云), Liu Wen-Peng(刘文鹏), Ding Li-Hua(丁丽华), and Yin Shao-Tang(殷绍唐) Structures and luminescence properties of Yb3+ in the double perovskites Ba2YB'O6 (B'=Ta5+, Nb5+) phosphors 2011 Chin. Phys. B 20 016101
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