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Influence of surface charges on the emission polarization properties of single CdSe/CdS dot-in-rods

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Abstract

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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Acknowledgements

The project was sponsored by the National Key Research and Development Program of China (Grant No. 2017YFA0304203), the National Natural Science Foundation of China (Grant Nos. 61527824, 61675119, 11434007, 61875109, and 61605104), PCSIRT (Grant No. IRT 17R70), 1331KSC and 111 project (Grant No. D18001).

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Authors and Affiliations

  1. State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, and Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, 030006, China

    Guo-Feng Zhang, Chang-Gang Yang, Rui-Yun Chen, Cheng-Bing Qin, Yan Gao, Lei Zhang, Lian-Tuan Xiao & Suo-Tang Jia

  2. Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081, China

    Yong Ge & Hai-Zheng Zhong

  3. School of Physics, Shandong University, Jinan, 250100, China

    Yong-Gang Peng & Yu-Jun Zheng

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  1. Guo-Feng Zhang
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Zhang, GF., Yang, CG., Ge, Y. et al. Influence of surface charges on the emission polarization properties of single CdSe/CdS dot-in-rods. Front. Phys. 14, 63601 (2019). https://doi.org/10.1007/s11467-019-0916-1

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