Broadband downshifting luminescence in Cr<sup>3+</sup>-Yb<sup>3+</sup>codoped garnet for efficient photovoltaic generation

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Journal Article
Optics Express, 2013, 21 (4), pp. 4167 - 4173
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The Cr3+-Yb3+codoped YAG crystals were synthesized by the solid state reaction method, in which the intense near-infrared emission around 1000 nm originated from Yb3+ 2F5/2→2F7/2transition was obtained due to the efficient energy transfer from Cr3+to Yb3+. The stable and transient spectral measurements revealed that the phonon assistant energy transfer process is responsible for the energy transfer from Cr3+to Yb3+upon both the excitations of Cr3+:4T1and4T2energy levels. Due to the effective absorption of Cr3+in the visible region in YAG and the efficient energy transfer to Yb3+, this material can be developed as spectral convertors to improve silicon solar cell photovoltaic conversion efficiency. © 2013 Optical Society of America.
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