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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Veröffentlicht in: | Journal of the American Ceramic Society 2011-03, Vol.94 (3), p.833-837 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | 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. |
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ISSN: | 0002-7820 1551-2916 |
DOI: | 10.1111/j.1551-2916.2010.04184.x |