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

Authors

  • Xiao Yong Huang,

    1. MOE Key Lab of Specially Functional Materials, School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, China
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  • Xiao Hong Ji,

    1. MOE Key Lab of Specially Functional Materials, School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, China
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  • Qin Yuan Zhang

    Corresponding author
    1. MOE Key Lab of Specially Functional Materials, School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, China
      †Author to whom correspondence should be addressed. e-mail: qyzhang@scut.edu.cn
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  • J. Ballato—contributing editor

  • This work is jointly supported by the NSFC (Grant Nos. 50872036 and U0934001) and the Doctorate Foundation of South China University of Technology.

†Author to whom correspondence should be addressed. e-mail: qyzhang@scut.edu.cn

Abstract

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 1S03P1 transition of Bi3+ ions, the characteristic near infrared luminescence of Yb3+ ions due to the 2F5/22F7/2 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.

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