Broadband downshifting luminescence in Cr3+-Yb3+ codoped garnet for efficient photovoltaic generation

Optical Society of America (OSA)
Publication Type:
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→2F7/2 transition 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+: 4T1 and 4T2 energy 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.
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