Er~(3+)/Yb~(3+)共掺四种玻璃中上转换发光效率的比较及研究

计算了在Er3+/Yb3+共掺的硅酸盐、锗酸盐、磷酸盐和氟化物这四种玻璃基质中施主离子归一化荧光线形函数与受主离子归一化吸收线形函数的重叠积分,交叉弛豫几率.通过求解能级跃迁速率方程,得出4S3/2能级的相对布居数.定义了上转换发光效率可以用自发辐射跃迁几率A61和4S3/2能级的相对布居数之积来表征.分析了由于氟化物中4S3/2能级的无辐射跃迁几率较小而自发辐射跃迁几率较大,因此4S3/2能级有较大的相对布居数,在四种Er3+/Yb3+共掺的玻璃中,氟化物具有较好的上转换发光效率.

A study and comparison of up-conversion luminescence efficiency in four Er3+/Yb3+ co-doped glasses

The overlap integrals between the unitary linetypefunction of the fluorescence of the benefactorions and the unitary linetypefunction of the absorbability of the acceptorions in silicate, germinate, phosphate and fluoride glasses are calculated. And the erossrelaxation probabilities in these glasses are calculated as well, The relative populations of the ions in ^4S3/2 lever are obtained on the basis of solving transferrateequations. The product of the spontaneous emission probability A61 and the relative populations of the ions in ^4 S3/2 lever are defined as the up-conversion luminescence efficiency. The conclusion is that luminescence efficiency in fluoride glass is bigger than that in other glasses. The reason is that the radiationless transition probability of ^4S3/2 lever in fluoride glass is bigger than that in other glasses.