立方相Y_2O_3:Eu纳米晶中C_2格位Eu^(3+)的~5D_0能级量子效率  

Quantum Efficiency of the ~5D_0 Level of Eu^(3+) at C_2 Site in Cubic Nanocrystalline Y_2O_3

作　　者：孟庆裕[1,2] 陈宝玖[1] 许武[1,3] 王晓君[1] 谢宜华[1] 赖华生[1,4] 狄伟华[1] 任国仲[1] 赵晓霞[1] 杨艳民[1] 

机构地区：[1]中国科学院长春光学精密机械与物理研究所,激发态物理重点实验室,吉林长春130033 [2]中国科学院研究生院 [3]中国科学技术大学 [4]江西南方稀土高技术股份有限公司

出　　处：《光谱学与光谱分析》2006年第8期1377-1381,共5页Spectroscopy and Spectral Analysis

基　　金："863"计划项目(2002AA311160);国家自然科学基金(10274083;50102006);吉林省自然科学基金(20030514-2;1999514);吉林省杰出青年基金(20040113)资助

摘　　要：采用化学自发燃烧法制备了立方相不同粒径的纳米晶Y2O3:Eu(1 mol%),并通过退火处理得到了体相材料,测量了它们的发射谱和处在C2格位上Eu3+的5D0能级室温和10 K下的荧光衰减曲线。利用发射光谱数据计算了Eu3+在不同粒径纳米晶体Y2O3中的光学跃迁强度参数Ωλ(λ=2,4),通过对室温和低温下5D0能级荧光衰减的测量,用两种不同方法估计了处在C2格位上Eu3+的5D0能级的量子效率,对所获得的结果进行了讨论,并对两种获得量子效率不同方法进行了评价。In the present the authors are trying to work out how the quantum efficiency depends on the nanocrystalline size. Cubic nanocrystalline Y2O3：Eu^3＋ samples were prepared by chemical self-combustiorL The bulk Y2O3：Eu^3＋ was obtained by annealing the nanocrystalline at 1 000℃ for 2 h. The emission spectra, XRD and fluorescence decay showed that the emission intensities are increased and fluorescence decay becomes slow with an increase in particle diameter of the samples. Two routes were used to estimate the quantum efficiency of the ^5D0 level of Eu^3＋ at C2 site. The quantum efficiencies of ^5D0 level of Eu^3＋ at C2 site in the samples depend on the nanocrystalline sizes. Finally, a detailed discussion about these two approaches for estimating the quantum efficiencies was made.

关 键 词：量子效率 荧光衰减 纳米 Y2O3 EU^3+ 

分 类 号：O614.3[理学—无机化学]