Ho^(3+)∶ZnWO_4的光谱和上转换发光  

SPECTROSCOPY AND UPCONVERSION PROCESS IN Ho^(3+)∶ZnWO_4 CRYSTAL

作　　者：臧竞存[1] 单秉锐[1] 宋晏蓉[2] 姚士仲[3] 郑大威[3] 叶建萍[4] 

机构地区：[1]北京工业大学材料学院 [2]北京工业大学应用数理学院 [3]北京工业大学生命科学与生物工程学院,北京100022 [4]中国科学院化学研究所,光化学重点实验室北京100080

出　　处：《硅酸盐学报》2005年第5期538-541,546,共5页Journal of The Chinese Ceramic Society

基　　金：中国科学院光化学重点实验室开放基金研究项目。

摘　　要：用提拉法生长出光学质量的Ho3+∶ZnWO4单晶,研究了晶体在可见和近红外区的吸收光谱和发射光谱,分析了Ho3+离子在钨酸锌晶体结构中能级位置和晶体场能级分裂。研究表明:在波长488nm激光激发时,550,665nm和758nm3个波段有较强荧光,荧光分支比分别为84.18%,0.68%,15.14%,对应于5S2→5I8,5F5→5I8和5S2→5I7跃迁。在633nm激光激发时观测到了来自5S2→5I8跃迁的540～556nm宽带上转换荧光,上转换过程主要是单离子步进吸收。The Ho^(3+)∶ZnWO_(4) single crystals were grown by Czochralski method. The absorption and fluorescence spectra of Ho^(3+)∶ZnWO_(4) at visible and infrared range were investigated. The position and splitting of the Stark energy levels of Ho^(3+) ions in ZnWO_(4) were defined at room temperature. Results show that stronger fluorescence emissions of the wavelengths of 550,665 and 758 nm were observed at laser 488 nm excited, fluorescence branch ratio of emissions is 84.18%, 0.68% and (15.14%), corresponding to ^(5)S_(2)→^(5)I_(8), ^(5)F_(5)→ ^(5)I_(8) and ^(5)S_(2)→^(5)I_(7), respectively. Conversion of red laser radiation to green ^(5)S_(2)→ ^(5)I_8 (emission) was observed at laser 633 nm excited, the upconversion process is found to be the step absorption of single ion.

关 键 词：掺钬钨酸锌晶体 提拉法晶体生长 上转换荧光 荧光光谱 

分 类 号：O433.4[机械工程—光学工程]