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Broadband Downconversion of Ultraviolet Light to Near‐Infrared Emission in Bi 3+ –Yb 3+ ‐Codoped Y 2 O 3 Phosphors
Author(s) -
Huang Xiao Yong,
Ji Xiao Hong,
Zhang Qin Yuan
Publication year - 2011
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2010.04184.x
Subject(s) - phosphor , ion , infrared , luminescence , ultraviolet , quantum efficiency , excitation , materials science , analytical chemistry (journal) , optoelectronics , ytterbium , atomic physics , doping , chemistry , optics , physics , chromatography , quantum mechanics , organic chemistry
The metal ion Bi 3+ has been shown to be an efficient broadband sensitizer for Yb 3+ ion in the Y 2 O 3 host lattice. Upon ultraviolet‐light excitation in the allowed 1 S 0 → 3 P 1 transition of Bi 3+ ions, the characteristic near infrared luminescence of Yb 3+ ions due to the 2 F 5/2 → 2 F 7/2 transition was observed as a result of energy transfer from Bi 3+ to Yb 3+ ions. It demonstrates that cooperative downconversion can be realized for Bi 3+ –Yb 3+ coupling. Yb 3+ ‐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.