Moisture-Assisted near-UV Emission Enhancement of Lead-Free Cs<sub>4</sub>CuIn<sub>2</sub>Cl<sub>12</sub> Double Perovskite Nanocrystals.
basic_science · Level V
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- Record sourced from PubMed, PMID 34939808.
- Also identified by DOI 10.1021/acs.nanolett.1c03822 and PMC identifier 8759080.
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Abstract
Lead-based halide perovskite nanocrystals (NCs) are recognized as emerging emissive materials with superior photoluminescence (PL) properties. However, the toxicity of lead and the swift chemical decomposition under atmospheric moisture severely hinder their commercialization process. Herein, we report the first colloidal synthesis of lead-free Cs<sub>4</sub>CuIn<sub>2</sub>Cl<sub>12</sub> layered double perovskite NCs via a facile moisture-assisted hot-injection method stemming from relatively nontoxic precursors. Although moisture is typically detrimental to NC synthesis, we demonstrate that the presence of water molecules in Cs<sub>4</sub>CuIn<sub>2</sub>Cl<sub>12</sub> synthesis enhances the PL quantum yield (mainly in the near-UV range), induces a morphological transformation from 3D nanocubes to 2D nanoplatelets, and converts the dark transitions to radiative transitions for the observed self-trapped exciton relaxation. This work paves the way for further studies on the moisture-assisted synthesis of novel lead-free halide perovskite NCs for a wide range of applications.