Er^3＋／Yb^3＋共掺Gd3Sc2Ga3O12晶体的上转换发光  

Up-conversion luminescence in Er^(3+)/Yb^(3+)-codoped Gd_3Sc_2Ga_3O_(12) laser crystals

作　　者：罗建乔[1,2] 孙敦陆[1] 张庆礼[1] 刘文鹏[1,2] 谷长江[1] 吴路生[1] 殷绍唐[1] 

机构地区：[1]中国科学院安徽光学精密机械研究所,合肥230031 [2]中国科学院研究生院,北京100049

出　　处：《物理学报》2008年第12期7712-7716,共5页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:50772112)资助的课题~~

摘　　要：研究了提拉法生长的Er3+/Yb3+:Gd3Sc2Ga3O12和Er3+:Gd3Sc2Ga3O12晶体在室温下320—1700nm范围的吸收光谱和500—750nm范围内的上转换荧光谱,同时对其上转换荧光的可能发生机制、途径以及上转换过程可能对Er3+的2.8μm波段激光振荡产生的影响进行了分析和讨论.结果表明:Yb3+的敏化显著地增强了晶体在966nm附近的吸收能力,大幅度加宽了晶体在该处的吸收带宽.在940nm激光的激发下,Er3+/Yb3+:Gd3Sc2Ga3O12中的上转换荧光强度明显强于Er3+:Gd3Sc2Ga3O12中的上转换荧光强度,表明Yb3+与Er3+之间存在高效率的能量传递,其主要上转换机制可能为Yb3+-Er3+,Er3+-Er3+能量传递.Er^3 ＋/Yb^3 ＋ ： Gd3 Sc2 Ga3 O12 and Er^3 ＋ ： Gd3 Sc2 Ga3 O12 crystals have been grown by Czochralski method. The absorption spectra from 320 to 1700 nm and the up-conversion flttoreseence spectra from 500 to 750 nm of them were investigated at room temperature, respeetively. The possible up-eonversion lumineseenee mechanisms in Er^3＋/Yb^3＋ -eodoped crystals and their influences on the 2.8μm laser emission were discussed. Experimental results show that the absorption of Er^3 ＋ ：Gd3 Sc2Ga3 O12 around 966 nm and its bandwidth are remarkably increased by Yb^3 ＋ sensitizing. Under 940 nm excitation, the up-conversion luminescence intensity of Er^3＋/Yb^3＋ ：Gd3Sc2Ga3O12 is much stronger than that of Er^3＋ ：Gd3Se2Ga3O12. It demonstrates that there exist effective energy transfer processes between Yb^3 ＋ and Er^3 ＋ , and the dominant mechanism of up-conversion may be the energy transfer processes of Yb^3 ＋ -Er^3 ＋ and Er^＋ -Er^3 ＋ .

关 键 词：光致发光 上转换 Er^3+:Gd3Sc2Ga3O12晶体 Er^3+/Yb^3+:Gd3Sc2Ga3O12晶体 

分 类 号：O482.31[理学—固体物理]