Temperature Dependent Luminescent Characterization of BaMgSiO 4:Eu 2+ Phosphor

Abstract

Abstract In this paper, the temperature-dependent photoluminescence properties of Ba1-xMgSiO4:xEu2+ (0.01≤x≤0.07) are investigated. The room temperature excitation and emission spectra indicate that the doping Eu2+ ions occupy three different Ba2+ sites. With rising the temperature, the spectra shape of Ba1-xMgSiO4:xEu2+ (x=0.02) changes significantly in the region of 400-650 nm. The emission at 492 nm has a significant red-shift. The intensity of the emission displays a nonlinear dependence on the temperature. The temperature-dependent luminescent properties are systematically investigated by analyzing the energy transfer among the Eu2+ ions in Ba1-xMgSiO4:xEu2+ (0.01≤x≤0.07). When the temperature rises from 298 to 523 K, the color coordinates of Ba1-xMgSiO4:xEu2+ (x=0.02) first shift to the green and then to the red region. The maximal value of the absolute and relative sensitivity of Ba1-xMgSiO4:xEu2+ (x=0.02) is 4.242 × 10−3 K−1 (at 423 K) and 0.3244 % K−1 (at 398 K), respectively.