尺寸效应对Er^3＋掺杂纳米Y2O3的发光特性的影响  

Size dependent luminescence properties of Er^(3+) doped nano-crystalline Y_2O_3

作　　者：肖思国[1,2] 阳效良[1,2] 丁建文[1,2] 颜晓红[3] 

机构地区：[1]湘潭大学材料与光电物理学院,纳米物理与稀土发光研究所,湘潭411105 [2]低维材料及其应用教育部重点实验室,湘潭411105 [3]南京航空航天大学理学院,南京210016

出　　处：《物理学报》2009年第1期165-173,共9页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:10674113);新世纪优秀人才基金(批准号:NCET-06-0707);湖南省自然科学基金(批准号:06JJ50006);湖南省教育厅项目(批准号:07B073,06A071)资助的课题~~

摘　　要：采用燃烧法制备了不同尺寸的Er3+掺杂Y2O3粉体材料,研究了尺寸效应对Er3+掺杂纳米Y2O3材料发光特性的影响.光声光谱显示,对于不同晶粒尺寸的样品,Er3+离子光声峰位置几乎保持不变.这表明小尺寸效应对稀土离子能级位置影响很小.对488nm激光激发下的发射谱的分析发现,随着样品颗粒尺寸的减小,4S3/2能级和2H11/2能级向基态发射的强度比减小.分析认为属于超敏跃迁的2H11/2能级向基态的荧光发射随粒子尺寸的减小而相对增强.对518nm激发下554nm的荧光衰减曲线的测试和分析发现,处于4S3/2激发态的Er3+离子对之间的上转换能量传递概率随粒子尺寸的减小而增加.Er^（3＋） doped Y2O3 nano-crystals with different size are prepared using combustion method.Size effect on luminescence properties of Er^（3＋） doped Y2O3 nano crystals are investigated.No shift of the absorption peak in the photo-acoustic spectra is observed with the decrease of the Y2O 3 particle size,indicating that the size induced energy shifts of the rare-earth levels are negligible.However,the emission spectra under 488 nm excitation indicate that the ratio of the intensity of 4[KG-2]S_ 3/2 → 4[KG-2]I_ 15/2 transition to that of 2[KG-2]H_ 11/2 → 4[KG-2]I_ 15/2 decreases with the decrease of the particle size.It is believed that the rate of hypersensitive transition of 2[KG-2]H_ 11/2 → 4[KG-2]I_ 15/2 increases with the decrease of the particle size more quickly than that of transition of 4[KG-2]S_ 3/2 → 4[KG-2]I_ 15/2.The time dependence of the 554 nm luminescence decay excited by 518 nm reveals that the rate of up-converted energy transfer occurring between two Er^（3＋） ions in 4[KG-2]S 3/2 state increases with the decrease of the particle size.

关 键 词：Er^3+离子 纳米 发光 能量传递 

分 类 号：O482.31[理学—固体物理]