Er^(3+)/Yb^(3+)共掺杂氧氟硼硅酸盐微晶玻璃绿色上转换发光的温度特性

Temperature Characteristic of Green Upconversion Luminescence in Er^(3+)/Yb^(3+) Codoped Oxyfluoride Borosilicate Glass Ceramics

采用高温熔融法和热处理工艺制备得到透明的Er3+/Yb3+共掺杂氧氟微晶玻璃。XRD结果证实析出的纳米晶相为Ba YF5。在980 nm激发下,观察到强的绿光发射,源于Er3+的2H11/2→4I15/2和4S3/2→4I15/2跃迁的上转换发光。根据荧光强度比(FIR)的方法研究了微晶玻璃上转换荧光的温度传感特性,其最大灵敏度在523 K时为0.003 4 K-1,表明Er3+/Yb3+共掺氧氟硼硅酸盐微晶玻璃上转换发光在高精度温度传感器方面具有一定的应用前景。

Er3+/Yb3+ codoped oxyfluoride borosilicate glass ceramics were prepared by the traditional high temperature melt-quenching method and subsequent thermal treatment procedure and all the oxyfluo-ride glass ceramics were transparent. XRD results certified the formation of BaYF5 phase during the crys-tallization process. Under the excitation of 980 nm laser diode, strong green upconversion emissions were observed, which came from the transitions 2 H11/2→4 I15/2 and 4 S3/2→4 I15/2 of Er3+ ions. Based on the fluo-rescence intensity ratio(FIR) method, the temperature characteristic of green upconversion emission was investigated and the maximum sensitivity was 0. 003 4 K-1 at 523 K. The experiment results indicate that the upconversion luminescence of Er3+/Yb3+ co-doped oxyfluoride borosilicate glass ceramics is promis-ing for the application as optical temperature sensors with high accuracy.