Photoinduced fluorescence enhancement in colloidal CdSeTe/ZnS core/shell quantum dots

被引：21
|
作者：
Yuan, C. T. [1 ]
Chou, W. C. [1 ]
Chuu, D. S. [1 ]
Chen, Y. N. [2 ]
Lin, C. A. [3 ]
Chang, W. H. [3 ]
机构：
[1] Natl Chiao Tung Univ, Dept Electrophys, Hsinchu 30010, Taiwan
[2] Natl Cheng Kung Univ, Natl Ctr Theoret Sci, Tainan 701, Taiwan
[3] Chung Yuan Christian Univ, Dept Biomed Engn, Chungli 32023, Taiwan
来源：
APPLIED PHYSICS LETTERS | 2008年 / 92卷 / 18期
关键词：
D O I：
10.1063/1.2921779
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Photoinduced fluorescence enhancement (PFE) in colloidal CdSeTe/ZnS core/shell quantum dots (QDs) was investigated by monitoring ensemble fluorescence and single-QD fluorescence blinking behavior upon illumination. Ensemble fluorescence was increased in air and in vacuum with different enhanced factors. At the single-QD levels, fluorescence was also enhanced for some individual QDs. Relatively long on times, high quantum yields within the on times, and multilevel on states were found in fluorescence time traces. We suggest that the PFE origin from single-QD viewpoint is attributed to the contributions of surface passivation by photoinduced charged carriers and the formation of neutral core/charged shell QD states. (C) 2008 American Institute of Physics.
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页数：3
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