Influence of surface charges on the emission polarization properties of single CdSe/CdS dot-in-rods
Influence of surface charges on the emission polarization properties of single CdSe/CdS dot-in-rods
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DOI：
10.1007/s11467-019-0916-1
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发表时间：
2019-08
影响因子：
7.5
通讯作者：
Jia Suo-Tang
中科院分区：
文献类型：
--
作者：
Zhang Guo-Feng;Yang Chang-Gang;Ge Yong;Peng Yong-Gang;Chen Rui-Yun;Qin Cheng-Bing;Gao Yan;Zhang Lei;Zhong Hai-Zheng;Zheng Yu-Jun;Xiao Lian-Tuan;Jia Suo-Tang
本文报道了表面电荷对单根CdSe/CdS点状棒（DRs）发射极化特性影响的实验研究，这对其基于极化的实际应用具有重要意义。将n型半导体氧化铟锡（ITO）纳米颗粒覆盖在单DRs表面，通过界面电子转移使ITO在单DRs表面带电。光致发光强度和寿命的降低以及抑制闪烁的实验观察证实了这一点。结果表明，单dr偏振度直方图的半最大值全宽度由玻璃上的0.24展宽到ITO上的0.41。为了解释实验结果，考虑样品参数、发射极化和表面电荷，计算了单DRs的带边激子精细结构。计算结果表明，发射态的能级排序决定了在表面电子影响下极化度的增大或减小。表面电子可以诱导发光能级之间的间距增加，从而改变居数，从而改变极化度。此外，不同数量的表面电子可能随机分布在长CdSe/CdS棒上，导致单DRs受到非均质影响，从而导致极化度展宽。
We report an experimental investigation of the influence of surface charges on the emission polarization properties of single CdSe/CdS dot-in-rods (DRs), which is important for their polarization-based practical applications. By covering the single DRs with N-type semiconductor indium tin oxide (ITO) nanoparticles, the surface of single DRs is charged by ITO through interfacial electron transfer. This is confirmed by the experimental observations of the reduced photoluminescence intensities and lifetimes as well as the suppressing blinking. It is found that the full width at half maximum of histogram of polarization degrees of the single DRs is broadened from 0.24 (on glass) to 0.41 (in ITO). In order to explain the exprimental results, the band-edge exciton fine structure of single DRs is calculated by taking into account the sample parameters, the emission polarization, and the surface charges. The calculation results show that the level ordering of the emitting states determines the polarization degrees tending to increase or decrease under the influence of surface electrons. The surface electrons can induce an increase in the spacing between the emitting levels to change the populations and thus change the polarization degrees. In addition, different numbers of surface electrons may randomly distribute on the long CdSe/CdS rods, leading to the heterogeneous influences on the single DRs causing the broadening of polarization degrees also.
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