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Synthesis and optical properties of Mn2+-doped Cd–In–S colloidal nanocrystals

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Abstract

In recent years, light-emitting Mn2+-doped nanocrystals (NCs) have been widely studied because of their strong and stable Mn2+ d–d emission. Herein, highly efficient colloidal Mn2+-doped Cd–In–S NCs were prepared by a hot injection strategy. The as-prepared NCs have a cubic crystal structure of CdS host and exhibit strong Mn2+ emission. The photoluminescence (PL) intensity, PL position, and PL lifetime of this Mn2+ emission can be adjusted by changing the doping level of Mn2+. In particular, by tuning the amount of dopant, the emission color can be varied in the range of 601 nm to 643 nm, which is due to the coordination field environment of Mn2+ ions changed by the doping concentration. The PL intensity of Mn2+ is significantly enhanced by the ZnS shell coating, and the highest PL quantum yield can reach 56%, which is attributed to the removal of NCs surface-related defects by shell modification. A prototype LED was fabricated as well by using the as-prepared highly efficient Mn2+-doped Cd–In–S NCs as a color conversion material. The Mn2+-doped multicomponent semiconductor NCs reported here extend the availability of classical Mn2+-doped luminescent materials and provide alternatives for other applications requiring orange-red colloidal NCs.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (51902064), the special fund for “Guangxi Bagui Scholars” and the “Guangxi Hundred-Talent Program”.

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Authors and Affiliations

  1. MOE Key Laboratory of New Processing Technology for Non-ferrous Metals and Materials, and Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, School of Physical Science and Technology, Guangxi University, Nanning, 530004, China

    Sheng Cao, Shangfei Yao, Bingsuo Zou & Jialong Zhao

  2. School of Material Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore

    Chencheng Dai

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  1. Sheng Cao
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Cao, S., Dai, C., Yao, S. et al. Synthesis and optical properties of Mn2+-doped Cd–In–S colloidal nanocrystals. J Mater Sci 55, 12801–12810 (2020). https://doi.org/10.1007/s10853-020-04923-w

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