Ce^(3+)和Mn^(2+)掺杂的Ba_9(Y_(2-x)Sc_x)(SiO_4)_6光谱特性和温度特性研究

Luminescence and Thermal Properties of Ce^(3+),Mn^(2+) Codoped Ba_9(Y_(2-x)Sc_x)(SiO_4)_6 Phosphors

采用高温固相法制备了Ba9(Y2-x Sc 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。

Ba9( Y2-x Sc 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.