Broadband Downconversion of Ultraviolet Light to Near-Infrared Emission in Bi3+-Yb3+-Codoped Y2O3 Phosphors

The metal ion Bi3+ has been shown to be an efficient broadband sensitizer for Yb3+ ion in the Y2O3 host lattice. Upon ultraviolet‐light excitation in the allowed 1S0→3P1 transition of Bi3+ ions, the characteristic near infrared luminescence of Yb3+ ions due to the 2F5/2→2F7/2 transition was observed...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2011-03, Vol.94 (3), p.833-837
Main Authors: Huang, Xiao Yong, Ji, Xiao Hong, Zhang, Qin Yuan
Format: Article
Language:English
Subjects:
Broadband
Ceramics
Crystal structure
Emission
Energy transfer
Luminescence
Phosphors
Ultraviolet
Yttrium oxide
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Summary:The metal ion Bi3+ has been shown to be an efficient broadband sensitizer for Yb3+ ion in the Y2O3 host lattice. Upon ultraviolet‐light excitation in the allowed 1S0→3P1 transition of Bi3+ ions, the characteristic near infrared luminescence of Yb3+ ions due to the 2F5/2→2F7/2 transition was observed as a result of energy transfer from Bi3+ to Yb3+ ions. It demonstrates that cooperative downconversion can be realized for Bi3+–Yb3+ coupling. Yb3+‐concentration‐dependent quantum efficiency was evaluated and the maximum efficiency reached 173.8%. These phosphors are promising for the enhancement of energy efficiency of crystalline Si solar cells via spectrum shifting.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1551-2916.2010.04184.x