Size-dependent radiative emission of PbS quantum dots embedded in Nafion membrane

被引：0
|
作者：
Y. Chen
D. Yu
B. Li
X. Chen
Y. Dong
M. Zhang
机构：
[1] Sun Yat-Sen University,State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics and Engineering
[2] Sun Yat-Sen University,Key Laboratory of the Ministry of Education for Polymer Composite and Functional Materials, School of Chemistry and Chemical Engineering
来源：
Applied Physics B | 2009年 / 95卷
关键词：
78.47.-p; 78.55.-m; 78.67.-n;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
PbS quantum dots (QDs) have been incorporated in a Nafion membrane, where the QD sizes were adjusted by changing the reaction time due to the steady growing process. The radiative emissions of the samples were investigated by optical absorption, photoluminescence (PL), and time-resolved PL spectroscopy. Size-tunable emissions are shown by the PL spectrum in a range of 1.84–1.65 eV, and the emission mechanism was investigated based on a four-band envelope-function model. Possible energy transitions for the radiative emission are listed. The PL lifetime depending on the particle size is about one microsecond, and PL decay curves exhibit a trend of decreasing decay time with an increase of the PbS QD size.
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页码：173 / 177
页数：4
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