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.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
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~~
