ZrF_2-SiO_2基质中Er^(3+)在蓝/绿波段的上转换发光

Blue and green upconversion luminescence of Er^3+ in ZrF_2SiO_2

为了进一步探讨稀土Er^(3+)掺杂材料在蓝/绿可见波段和紫外波段的上转换发光机制,制备了掺杂Er^(3+)的ZrF_2-SiO_2材料,测量了样品的吸收谱和在980 nmLD激发下的上转换荧光发射谱,研究了上转换发光强度与激光泵浦功率的对数关系。分析了稀土Er^(3+)中4f电子跃迁的特征。证实了在980 nmLD的激发下,ZrF_2-SiO_2:Er^(3+)在404 nm、445 nm和525 nm、548 nm附近的蓝/绿可见波段上转换发光过程是激发态吸收(ESA),得到了~2H_(9/2)→~4I_(15/2)、~4F_(5/2)→~4I_(15/2)蓝光三光子过程和~4S_(3/2)→~4I_(15/2)、~2H_(11/2)→~4I_(15/2)绿光双光子过程上转换发光机制。

In order to further study the blue and green visible band and ultraviolet band upconversion emission of Er3+ co-doped in multi-hosts(Fluoride,Oxide or Fluoride-oxide). ZrF2-SiO2: Er3+were synthesized from ZrF2, Si02 and Er2O3, Reagents were mixed to equality and heated to temperature 800℃ and kept at this temperature for 0. 5 h then at 1 000℃ for 15 min in a muffle stove, and the absorption spectrum and upconversion fluorescence emission spectrum of Er3+ in ZrF2 SiO2, and upconversion luminescence intensity versus LD pump power were then measured. The analysis of the characters of 4f electron transition suggested that near wave length 404,445 nm and 525,548 nm, the blue and green visible band upconversion luminescence of Er3+ co-doped in ZrF2SiO2 were excited state absorption (ESA)under 980nm LD excitation, and three photons step by step absorption:2H9/2→4I15/2,4F5/2→4I15/2 and two photons step by step absorption;4S3/2→4115/2 ,2H11/2→4I15/2 are illustrated.