Effect of sintering temperature on the photoluminescence properties of red-emitting color conversion glass

Abstract

The red-emitting color conversion glasses were prepared by cosintering borosilicate glass frits and CaAlSiN3:Eu2+ phosphors at various temperatures in the 600–800 °C range. The effect of sintering temperature on the photoluminescence (PL) and excitation (PLE) of the color conversion glasses was investigated. Characteristics of color conversion glasses, with respect to excitation and emission intensity, quantum yield (QY) and CIE (Commission International de I’Eclairage) chromaticity were analyzed based on excitation and emission spectra. The glass, sintered at 600 °C, showed the best luminescence properties. Then, the intensity of excitation and emission peak decreased with the sintering temperature increasing. All excitation and emission peaks disappeared when the sintering temperature increased beyond 800 °C. The luminescence properties with the higher sintering temperature may be destroyed because of the lattice disturbance of CaAlSiN3 and oxidation of Eu2+, which is caused by reactions between glass matrices and CaAlSiN3:Eu2+ phosphors. The present study may promote the application of the red-emitting color conversion glasses in light emitting diodes encapsulation.