Er^(3+),Yb^(3+)共掺Gd_2WO_6荧光粉的下转换温度效应

Temperature Effect of Downconversion Luminescence in Er^(3+),Yb^(3+) Co-doped Gd_2WO_6 Phosphors

采用共沉淀法制备了Er3+,Yb3+共掺Gd2WO6荧光粉,通过对浓度猝灭曲线的分析表明Er3+间的相互作用类型为电偶极-电偶极相互作用。分析了样品荧光的温度效应并得到摩尔分数为5%和20%的Er3+掺杂样品的激活能ΔE分别为0.27和0.29 eV。利用Er3+的2H11/2和4S3/2能级跃迁至基态的荧光强度比随温度变化这一特性研究了两个不同Er3+掺杂浓度样品的下转换温度效应,结果表明该材料体系具有良好的温度传感特性。

The Er3＋ , Yb3＋ co-doped Gd2WO6 phosphors were prepared with co-precipitation meth- od. Electric dipole-dipole interaction between Er3＋ in Er3＋, yb3＋-doped Gd2WO6 phosphor is demonstrated from the curve of concentration quenching. By analyzing the temperature character of the phosphors, the activation energy of samples with 5% and 20% doping mole fractions is ob- tained and the experimental values are 0.27 and 0.29 eV, respectively. The temperature charac- ters of samples with two different doping concentrations are analyzed by means of fluorescence in- tensity ratio from 2H11/2→4I15/2 and 4S3/2→4I15/2 radiative transitions, indicating good temperature sensor for the present materials.