Abstract
Tm3+/Yb3+ co-doped phosphate glasses with different concentrations of Tm3+ were prepared by high-temperature melting method. The up-conversion (UC) emission spectra of the samples were measured under 975nm excitation. The blue UC emission at 477nm in the sample doped with 0.5mol% Tm3+ is very strong. By analyzing the power spectra and population processes of the UC emission, we found that photon avalanche phenomenon has existed in the energy transition between Tm3+ and Yb3+ ions, which results in the strong blue UC emission at 477nm. By this way, the luminous efficiency of the materials doped with Tm3+ will be greatly improved. Our research will be helpful in developing UC emission materials.
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