用熔融急冷法制备了系列Er3+/Ho3+共掺80GeS2-10In2S3-10CsI硫卤玻璃,测试了样品的状态稳定性、拉曼光谱、吸收光谱以及上转换光谱。在该样品中出现了强烈的绿光(526、549nm)和红光(660nm),分别对应于2 H11/2→4I15/2(Er3+)、4S3/2→4I15/2(Er3+)+5S2(5F4)→5I8(Ho3+)和4F9/2→4I15/2(Er3+)+5F5→5I8(Ho3+)的跃迁。研究了Er3+/Ho3+离子在该样品中的上转换发光机制和能量传递机理。在该系列0.6%(摩尔分数)Er2S3/xHo2S3共掺样品中,上转换发光强度随着Ho2S3掺杂量的增加而显著提高,当Ho2S3掺杂量增加至0.6%(摩尔分数)时,绿光(549nm)和红光(660nm)强度达到最大值,此时的绿光和红光强度分别是未掺Ho2S3时的4.2和10倍。绿光和红光均为双光子吸收过程。
A serials of chalcohalide glasses based on the composition 80GeS2-10In2S3-10CsI doped with the different Er3+/Ho3+ ions ratio were synthesized by melt-quenching technique.The state stability,Raman spectra,absorption spectra,upconversion emission spectra of glass samples were measured.Three intense upconversion luminescence emissions are observed at around 526,549,and 660nm,which correspond to Er3+:2H11/2→4I15/2,Er3+:4S3/2→4I15/2+Ho3+:5S2(5F4)→5I8,and Er3+:4F9/2→4I15/2+ Ho3+:5F5→5I8 transitions,respectively.In 0.6mol% Er2S3/xHo2S3 codoped glasses,increase of Ho2S3 had positive effect up to the upconversion fluorescences.The upconversion emissions reach the maximum values when Ho2S3 is 0.6 mol%,and the intensities of the green and red light emissions were 4.2 and 10 times stronger than those un-doped Ho2S3,respectively.The possibie upconversion mechanisms and energy transfer between Er3+ and Ho3+ were also estimated and evaluated.All the three emissions are based on two photon absorption processes.