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壳层相关的CdSe核/壳量子点发光的热稳定性
Shell-dependent Thermal Stability of CdSe Core/shell Quantum Dot Photoluminescence
- 发光学报 2014年35卷第9期 页码：1051-1057
- 作者机构：
1. 东北大学 理学院,辽宁 沈阳,110819
2. 功能材料物理与化学教育部重点实验室 吉林师范大学,吉林 四平,136000
- 作者简介：
- 基金信息：国家自然科学基金（21371071）();吉林省科技发展计划（20120344）资助项目()
DOI：10.3788/fgxb20143509.1051
中图分类号： O482.31收稿日期：2014-05-02，
修回日期：2014-07-03，
纸质出版日期：2014-09-03
- 稿件说明：
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陈肖慧, 袁曦, 华杰等. 壳层相关的CdSe核/壳量子点发光的热稳定性[J]. 发光学报, 2014,35(9): 1051-1057
CHEN Xiao-hui, YUAN Xi, HUA Jie etc. Shell-dependent Thermal Stability of CdSe Core/shell Quantum Dot Photoluminescence[J]. Chinese Journal of Luminescence, 2014,35(9): 1051-1057
陈肖慧, 袁曦, 华杰等. 壳层相关的CdSe核/壳量子点发光的热稳定性[J]. 发光学报, 2014,35(9): 1051-1057 DOI： 10.3788/fgxb20143509.1051.
CHEN Xiao-hui, YUAN Xi, HUA Jie etc. Shell-dependent Thermal Stability of CdSe Core/shell Quantum Dot Photoluminescence[J]. Chinese Journal of Luminescence, 2014,35(9): 1051-1057 DOI： 10.3788/fgxb20143509.1051.
摘要
测量了CdSe/ZnS （3 ML）核/壳结构及CdSe/CdS （3 ML）/ZnCdS （1 ML）/ZnS （2 ML） 核/多壳层结构量子点在80~460 K范围内的光致发光光谱，研究了壳层结构对CdSe量子点发光热稳定性的影响。详细地分析了CdSe量子点的发光峰位能量、线宽和积分强度与温度之间的关系，发现CdSe量子点的发光热稳定性依赖于壳层结构。CdS/ZnCdS/ZnS多壳层结构包覆CdSe量子点在低温和高温部分的热激活能均大于ZnS壳层包覆的CdSe量子点，具有更好的发光热稳定性。此外，在300-460-300 K加热-冷却循环实验中，CdS/ZnCdS/ZnS多壳层结构包覆CdSe量子点的发光强度永久性损失更少，热抵御能力更强。
Abstract
The photoluminescence (PL) spectra of CdSe/ZnS (3 ML) core/shell quantum dots (QDs) and CdSe/CdS (3 ML)/ZnCdS (1 ML)/ZnS (2 ML) core/multishell QDs were measured in the temperature range from 80 to 460 K by steady-state PL spectroscopy. The temperature dependence of PL energy
linewidth
and intensity for CdSe QDs was investigated. It is found that the thermal stability of CdSe QD emissions is significantly dependent on the shell structure. The thermal activation energy of CdSe/CdS/ZnCdS/ZnS core/multishell QDs is higher than that of CdSe/ZnS core/shell QDs. Furthermore
the stability of CdSe QDs at high temperature was also examined through heating-cooling cycling experiments. The permanent loss of PL intensity for CdSe/CdS/ZnCdS/ZnS core/multishell QDs is smaller than that of CdSe/ZnS core/shell QDs.
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references
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