The up-conversion luminescent material BaMoO,4,:Yb,3+,/Tm,3+, was prepared by hydrothermal method. The thermal stability and luminescence properties of the materials were studied by changing the synthesis temperature and test temperature. It indicated that, when,C,Yb,3+,=6% and ,C,Tm,3+,=1.5%, the grain size of the samples increased after recrystallization at 743 K, but the luminescence properties and thermal stabilities of the samples were improved obviously. The samples had high degree of crystallinity and they were tetragonal system. By measuring the up-conversion emission spectra and the decay curves of the samples, it was found that the thermal stability of the samples was excellent. The quantum yield of the sample was 1.5% and the emission color was uniform. Therefore, the sample has high luminescence property, thermal stability and practical value.
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