Abstract
Ce3+-Yb3+ co-doped Y3Al5O12 (YAG) phosphors were prepared, and their photoluminescence spectra, photoluminescence excitation spectra and fluorescence decay curves were measured at different temperatures from 8 K to 300 K. Experimental results show that, besides thermal quenching effect, the energy transfer is also the mechanism for the temperature dependence of the Yb3+ emission. A photo-induced Ce-O-Yb charge transfer state model is proposed to explain the variation of the emission with the temperature. The decay curves of the co-doped YAG phosphors at different temperatures can also be explained by the model.
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