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Controlling wide-spectrum fluorescence on Au/ZnSe multi-heterojunction

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Abstract

We present a wide-spectrum photoluminescence (PL) enhancement effect on the multi-heterojunction of ZnSe quantum dots and gold nanoparticles (NPs). The Au/ZnSe heterojunction is fabricated using Langmuir–Blodgett assembling method. The photoluminescence is measured using a 150 nm aperture ultraviolet laser beam spot of a scanning near-field optical microscope. The enhancement of band-gap emission and defect PL, the quenching of the fluorescence are, respectively, observed, which depend on the distance of gold NPs and ZnSe quantum dots. The enhancement of the band-gap emission is ascribed to the local field enhancement induced by the resonant coupling between the excitons of ZnSe and the surface plasmons of gold NPs. The enhancement of the defect PL is a result of the electron trapped by the defect states in the process of transporting electrons from ZnSe QDs to gold NPs due to the increase of the built-in electric field to hinder the electron transfer to gold nanoparticles. In addition, the quenching of the fluorescence is due to the electron transfer from ZnSe quantum dots to gold NPs. Our result opens the possibility of applications in forming uniform optoelectronic heterojunction and in controlling fluorescent efficiency of PL devices.

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Acknowledgements

This research work was partially supported by National Natural Science Foundation of China (No. 61741505, 11204046), International Scientific and Technological Cooperation of China (No. 2014DFA00670), Guizhou province science and technology Projects (No. QKHZ [2017]2887), The central government will guide local science and technology development Projects (No. QKZYD[2017]4004).

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Authors and Affiliations

  1. College of Big Data and Information Engineering, Guizhou University, Guiyang, 550025, China

    Man Peng, Xianji Li & Zhengping Zhang

  2. College of Medicine, Guizhou University, Guiyang, 550025, China

    Zhongchen Bai

  3. Guizhou Province Key Laboratory for Photoelectric Technology and Application, Guizhou University, Guiyang, 550025, China

    Zhongchen Bai, Xianji Li, Ying Zhang & Zhengping Zhang

  4. College of Mechanical and Electrical Engineering, Guizhou Normal University, Guiyang, 550025, China

    Man Peng

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  1. Man Peng
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Correspondence to Man Peng or Zhengping Zhang.

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Peng, M., Bai, Z., Li, X. et al. Controlling wide-spectrum fluorescence on Au/ZnSe multi-heterojunction. Appl. Phys. A 124, 480 (2018). https://doi.org/10.1007/s00339-018-1888-7

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  • DOI: https://doi.org/10.1007/s00339-018-1888-7

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