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Research Article

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

Jiejun Ren1, Xiaopeng Zhou1, Yuhua Wang1( )
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
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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.

Keywords

perovskite quantum dotsCsPbX3:Mn2+Cs4PbX6phase transformationMn doping

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Nano Research
Volume 13 Issue 12,
December 2020
Pages 3387-3395
DOI: 10.1007/s12274-020-3026-z
Cite this article:
Ren J, Zhou X, Wang Y. Water triggered interfacial synthesis of highly luminescent CsPbX3:Mn2+ quantum dots from nonluminescent quantum dots. Nano Research, 2020, 13(12): 3387-3395. https://doi.org/10.1007/s12274-020-3026-z
Topics:
Heavy metalsLead compoundsLight emitting diodes LuminescenceMetal ionsNanocrystalsPerovskiteSemiconductor quantum dots

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Received: 12 June 2020
Revised: 25 July 2020
Accepted: 01 August 2020
Published: 04 September 2020
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature
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