Observation of dipolar emission patterns from isolated Eu3+:Y2O3 doped nanocrystals:: new evidence for single ion luminescence

被引:64
作者
Bartko, AP
Peyser, LA
Dickson, RM
Mehta, A
Thundat, T
Bhargava, R
Barnes, MD
机构
[1] Oak Ridge Natl Lab, Chem & Analyt Sci Div, Oak Ridge, TN 37831 USA
[2] Oak Ridge Natl Lab, Life Sci Div, Oak Ridge, TN 37831 USA
[3] Georgia Inst Technol, Sch Chem & Biochem, Atlanta, GA 30332 USA
基金
美国国家科学基金会;
关键词
D O I
10.1016/S0009-2614(02)00630-9
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
We report results of emission pattern imaging experiments from single Eu3-:Y2O3 nanocrystals (3-12 nm size) designed to provide new insight on the luminescence dynamics of isolated rare-earth doped nano-phosphors. We observe dipolar emission patterns that are characteristic of single quantum emitters whose orientation appears fixed on the measurement time scale. We also show that the luminescence from single nanoparticles is linearly polarized. also characteristic of single quantum system behavior. Taken in combination with dynamical observations of blinking and discrete photobleaching, these experiments provide strong evidence for single ion luminescence, and confirm the dipolar nature of the optical transitions of Eu3+ in inorganic crystals. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:459 / 465
页数:7
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