氟氧化物基质中Er3+绿光上转换发光

多种稀土离子掺杂在蓝/绿可见波段和紫外波段存在受激发射,可能成为制备短波长激光、发光半导体重要的候选材料.近年来,对稀土Er3+上转换发光的研究有了长足发展,在多种基质中发现了Er3+在蓝/绿可见波段的上转换发光.分析了稀土Er3+中4f电子跃迁的特征,讨论了不同基质对Er3+在可见波段上转换发光的影响,提出了在980nmLD的激发下,氟氧化物基质中Er3+在550～525nm附近的绿光上转换发光过程是激发态吸收(ESA),给出了4I15/2→4I11/2→4F7/2步进双光子吸收、激发态4F7/2→2H11/2和4F7/2→4S3/2的无辐射跃迁、4S3/2→4I15/2和2H11/2→4I15/2绿光上转换发光机制.

Green upconversion luminescence of Er3+ Co-doped Fluoride-oxide host

Rare-earth ions in co -doped hosts can be stimulated to emit luminescence between the blue and green visible band and the ultraviolet band, and may serve as a major candidate material for short-wave length lasers and semiconductor luminescence. Study on upconversion luminescence of Er3+ has made great progress in recent years and the blue and green visible band upconversion emission of Er3+ in many co -doped hosts is observed. The characteristics of 4f electron transition is analyzed here and the effects of different hosts on upconversion luminescence of Er3+ on visible bands are discussed. It is proved that it is by excited state absorption (ESA) that Er3+ in co -doped luoride -oxide hosts emits green upconversion luminescence between 550 ~ 525nm under 978nm LD excitation. The mechanics is given concerning the double photon step -by -step absorption ;the excited - state no -emission transition of ;and the green upconversion luminescence of .