Ce3+和Mn2+掺杂的Ba9(Y2-xScx)(SiO4)6光谱特性和温度特性研究

采用高温固相法制备了Ba₉(Y_2-xSc_x)(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。

Luminescence and Thermal Properties of Ce3+, Mn2+ Codoped Ba9(Y2-xScx)(SiO4)6 Phosphors

Ba₉(Y_2-xSc_x)(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.