4.8 Article

CsPbxMn1-xCl3 Perovskite Quantum Dots with High Mn Substitution Ratio

Journal

ACS NANO
Volume 11, Issue 2, Pages 2239-2247

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acsnano.6b08747

Keywords

perovskite quantum dots; CsPbxMn1-xCl3; low lead; phosphine-free preparation; light-emitting diode

Funding

  1. National Key Research and Development program of China [2016YFB0401701]
  2. NSFC [51425303, 21404015, 21374042]
  3. 973 Program of China [2014CB643503]
  4. Special Project from MOST of China

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CsPbX3 (X = CI, Br, I) perovskite quantum dots (QDs) are potential emitting materials for illumination and display applications, but toxic Pb is not environment and user-friendly. In this work, we demonstrate the partial replacement of Pb with Mn through phosphine-free hot injection preparation of CsPbxMn1-xCI3 QDs in colloidal solution. The Mn substitution ratio is up to 46%, and the as prepared QDs maintain the tetragonal crystalline structure of the CsPbCI3 host. Meaningfully, Mn substitution greatly enhances the photoluminescence quantum yields of CsPbCI3 from 5 to 54%. The enhanced emission is attributed to the energy transfer of photoinduced excitons from the CsPbCI3 host to the doped Mn, which facilitates exciton recombination via a radiative pathway. The intensity and position of this Mn-related emission are also tunable by altering the experimental parameters, such as reaction temperature and the Pb-to-Mn feed ratio. A light-emitting diode (LED) prototype is further fabricated by employing the as-prepared CsPbxMn1-xCI3 QDs as color conversion materials on a commercially available 365 nm GaN LED chip.

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