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中文摘要：
室温下观察了YAG∶Cr^3＋,Yb^3＋材料在近红外区域的发光特性,并通过对Cr^3＋：4T2和Yb^3＋：2F5/2能级辐射跃迁寿命以及它们布居时间的比较研究,提出了从Cr^3＋到Yb^3＋的能量传递机制,同时借助于能级图描述了从Cr^3＋到Yb^3＋的能量传递以及Cr^3＋和Yb^3＋的近红外发光过程。
英文摘要：
Cr^3＋-and Yb^3＋-doped YAG powder samples were prepared and the energy transfer （ ET） mechanism in the samples was evaluated by the photoluminescence （ PL） , photoluminescence exci-tation （ PLE） and light-emitting lifetime. By taking advantage of the spin allowed 4 A2→ 4 T2 and 4 A2→ 4 T1 absorption of Cr^3＋ and the efficient energy transfer from Cr^3＋ to Yb^3＋, the broadband spectral conversion makes Yb^3＋：2 F5/2→2 F7/2 transition give off a desirable emission around 1 000 nm, which is according to the maximum spectral response of c-Si solar cells, and hence would lead to the enhancement of silicon solar photovoltaic conversion efficiency.
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