采用高温固相法制备了Ba9(Y2-xScx)(SiO4)6∶Ce3+,Mn2+(x=0,0.5,1.0,1.5,2.0)样品。在该体系中, 当Sc3+含量从x=0逐渐增加至x=2时, Ce3+的蓝光发射强度提高了1.7倍; 同时, Mn2+的红光发射强度提高了1.9倍, 显示了优良的红光特性。样品的发射光谱和漫反射光谱表明, Ce3+、Mn2+发射强度的增加与Ce3+吸收能力和Ce3+向Mn2+能量传递的提升有直接关系。研究了样品Ba9Sc2(SiO4)6∶Ce3+,Mn2+的热稳定性。随着温度的升高, Mn2+的红光发射呈现先升后降的态势。当温度从室温升至488 K时, Mn2+发射强度仅下降至室温时的84%, 表现出优良的热稳定性。高亮的红光发射和优良的热稳定性表明该荧光材料可为紫外基白光LED提供良好的红色光源。

Ba9(Y2-xScx)(SiO4)6∶Ce3+,Mn2+ (x=0,0.5,1.0,1.5,2.0) samples are prepared by solid-state reaction. For this phosphor, with the gradually increased Sc3+ contents from x=0 to x=2, the blue emission intensity of Ce3+ for x=2 sample increases to 1.7 times and the red emission intensity of Mn2+ increases to 1.9 times. By monitoring the photoluminescence and diffuse reflection spectra, it reveals that the increases of the Ce3+ and Mn2+ emissions are directly related with the enhancement of the absorbance of Ce3+ and the energy transfer efficiency from Ce3+ to Mn2+. The x=2 sample, Ba9Sc2(SiO4)6∶Ce3+,Mn2+, was chosen for further thermal properties investigation. With temperature increasing, the red emission of Mn2+ increases originally and then decreases. As the temperature reaches to 488 K, the intensity is as high as 84% of that at room temperature. The enhanced red luminescence and superior temperature stability indicate BSS∶Ce3+,Mn2+ could be used for UV-based white LEDs as the red light source.