Abstract
In this work, Dy3+-Eu3+ doped precursor glass and transparent glass-ceramics containing Ba2YNbO6 crystal phase have been designed by the melting crystallization method. It was proved by XRD and XPS that the target crystal phase was successfully obtained. 750 ℃/180 min was selected as the heat treatment condition, after analyzing the micro-morphology, fluorescence spectra, transmittance curves and Vickers hardness of glass-ceramics. Under this condition, the luminescence intensity and Vickers hardness of glass-ceramic were about 50% and 30% higher than that of precursor glass, respectively. The chromaticity coordinate of the 2.0%Dy3+-1.0%Eu3+ co-doped glass-ceramic was (0.4158, 0.3862), and the correlated color temperature was 3179 K. Its excellent stability to thermal quenching at LED working temperature (423–473 K) was observed and the luminescence intensity can be maintained above 89.6% of room temperature. The activation energy of 2.0%Dy3+-1.0%Eu3+ co-doped glass-ceramic was estimated to be 0.3548 eV by temperature-dependent emission spectra, and the color coordinate shift was small, about 5.4 × 10−3. The research results show that the glass-ceramic has good warm white luminescence properties and fluorescent thermal stability.
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