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Water triggered interfacial synthesis of highly luminescent CsPbX3:Mn2+ quantum dots from nonluminescent quantum dots

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Abstract

Currently, lead halide perovskite quantum dots (PeQDs) have attracted great attention due to their spectacular photophysical properties. However, the toxicity of Pb2+ heavy metal ions in CsPbX3 PeQDs limits their practical applications. Herein, a facile post-treatment doping method is proposed, which enables the preparation of highly luminescent low-toxic CsPbX3:Mn2+ PeQDs from nonluminescent Cs4PbX6 PeQDs at water interface. The monodispersed CsPbX3:Mn2+ PeQDs exhibit excellent photophysical properties, including high photoluminescence quantum yield up to 87%. The reaction process and doping mechanism are deeply explored through in-situ monitoring. By simply adjusting the halide composition of the original Cs4PbX6 PeQDs or Mn doping concentration, a series of CsPbX3:Mn2+ PeQDs with adjustable emission could be obtained. Further, the CsPbX3:Mn2+ Q-LED was fabricated and exhibited excellent orange light with the color coordinates of (0.564, 0.399), correlated color temperature (CCT) of 1,918 K, and luminous efficiency (LE) of 24 lm/W, which illustrate the great promise in light emitting diode (LED) applications. This work not only provides a facile method for the preparation of highly luminescent low-toxic CsPbX3:Mn2+ PeQDs, but also provides insights into the mechanism of doping process.

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Acknowledgements

The authors gratefully acknowledge the financial support from the National Natural Science Foundation of China (No. U1905213).

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  1. Department of Materials Science, School of Physical Science and Technology, Key Laboratory of Special Function Materials and Structure Design of Ministry of Education, National and Local Joint Engineering Laboratory for Optical Conversion Materials and Technology of National Development and Reform Commission, Lanzhou University, Lanzhou, 730000, China

    Jiejun Ren, Xiaopeng Zhou & Yuhua Wang

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Ren, J., Zhou, X. & Wang, Y. Water triggered interfacial synthesis of highly luminescent CsPbX3:Mn2+ quantum dots from nonluminescent quantum dots. Nano Res. 13, 3387–3395 (2020). https://doi.org/10.1007/s12274-020-3026-z

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