掺Er3+/Yb3+氟氧玻璃的上转换发光特性

制备了新的Er³⁺/Yb³⁺共掺氟氧硅酸盐微晶玻璃,测试了材料的荧光光谱和吸收光谱。上转换光谱表明:有红(645 nm)、绿(545,522 nm)、蓝(480 nm)4个发光中心,分别对应Er³⁺的⁴F_9/2→⁴I_15/2、⁴S_3/2→⁴I_15/2、²H_11/2→⁴I_15/2、⁴F_7/2→⁴I_15/2 跃迁。发光曲线拟合斜率分别为1.81、2.39、1.95、2.15,均为双光子吸收过程。样品经热处理降低了声子能量,大大提高了上转换效率。采用Judd-Ofelt理论对样品光谱进行了分析,拟合得到了强度参数。

Properties of Up-conversion Emission of Er3+/Yb3+ Co-doped Oxyfluoride Glass

The Er3+/Yb3+ co-doped oxyfluoride silicate glass ceramics were prepared.The fluorescence spectrum and absorption spectrum were characterized.The up conversion spectrum showed that there were four luminescence centres at red(645 nm),green(545,522 nm) and blue(480 nm),corresponding to the 4F9/2→4I15/2,4S3/2→4I15/2,2H11/2→4I15/2,4F7/2→4I15/2 transitions of Er3+.The slope of fitted lines was 1.81,2.39,1.95,2.15,respectively,which indicated a two-photon absorption process.The results showed that the samples lowered phonon energy and greatly improved the up-conversion efficiency by heat treatment.Judd-Ofelt theory was employed and the intensity parameters were obtained.