Luminescence and energy transfer of Dy3+-Eu3+ co-doped glass-ceramics containing ZnMoO4

Abstract

Dy3+-Eu3+ co-doped glass-ceramics (GCs) containing ZnMoO4 were successfully prepared. The temperature range of heat treatment was preliminarily determined by differential scanning calorimeter (DSC) and thermogravimetry (TG). The crystalline phase was determined by X-ray diffraction (XRD), the structural feature was analyzed on the basis of Rietveld refinement, the morphology was observed by scanning electron microscopy (SEM), the absorption coefficients were calculated by light transmission curves. Combined with the above analysis, the optimal heat treatment condition was discussed. Through the fluorescence spectra and decay curve, there existed an energy transfer between Dy3+ and Eu3+, and the energy transfer efficiency from Dy3+ to Eu3+ increased with the increase of Eu3+ concentration. By calculating the critical distance and linearly fitting the data, it could be concluded that the mechanism of energy transfer was dipole-dipole interaction. With the changed of Dy3+-Eu3+ doped concentration, the color coordinates of these samples can be tuned in the white light region, and the 0.4% Dy3+-0.7% Eu3+ co-doped glass-ceramics obtained warm white light emission with low correlated color temperature (CCT). These results clearly showed that Dy3+-Eu3+ co-doped GCs containing ZnMoO4 could be used as a potential candidate material in the field of white light-emitting diodes (w-LEDs).