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<p>As is known to all, the easy degradation of CsPbX<sub>3</sub> (X = Cl, Br, I) perovskite quantum dots (PQDs) in water or moisture seriously hinders their commercial practical application. Here in this article, a facile method to synthesize highly water-stable CsPbBr<sub>3</sub> PQDs in aqueous solution based on a crystal evolution strategy is proposed. Hydrobromic acid (HBr) solution is used to provide a sufficient Br source to obtain pure and high-quality Cs<sub>4</sub>PbBr<sub>6</sub> crystals, which is crucial for the synthesis of CsPbBr<sub>3</sub> PQDs. It is found that rapid etching of PQDs surface by water can be hampered by slow addition of deionised water. Unlike the common use of oleic acid (OA) and oleylamine OAm as capping organic ligands, the strong acidity of HBr contributes to the removal of OA and deprotonation of OAm. Hydrophobic PMMA is further used to improve the stability of aqueous PQDs, and the synthesized CsPbBr<sub>3</sub>@PMMA aqueous solution shows near-unit photoluminescence quantum yield (PLQY) of 98.5%. As a result, when stored at room temperature for dozens of days, CsPbBr<sub>3</sub>@PMMA PQDs still maintain their excellent optical properties both in solution and as films. Furthermore, the white light-emitting diodes (WLEDs) and anti-counterfeiting patterns can be successfully fabricated using CsPbBr<sub>3</sub>@PMMA. This study offers a viable design strategy for the synthesis of all-inorganic lead halide PQDs with strong polarity tolerance and highlights their promising applications in light-emitting devices and information encryption.</p> Graphical abstract <p></p>

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Water-driven synthesized CsPbBr3 perovskite quantum dots with excellent stability based on crystal evolution

  • 期刊论文

  • 发表日期：

    2025年6月27日

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  • Zhongwei Zhang,
  • Zhihan Zhang,
  • Yunfei He,
  • Xiaofeng Chen,
  • Xin Li,
  • Shulin Duan,
  • Weiwei Zhang,
  • Huiling Zhu,
  • Haiqing Sun,
  • Jianxu Ding

摘要

As is known to all, the easy degradation of CsPbX3 (X = Cl, Br, I) perovskite quantum dots (PQDs) in water or moisture seriously hinders their commercial practical application. Here in this article, a facile method to synthesize highly water-stable CsPbBr3 PQDs in aqueous solution based on a crystal evolution strategy is proposed. Hydrobromic acid (HBr) solution is used to provide a sufficient Br source to obtain pure and high-quality Cs4PbBr6 crystals, which is crucial for the synthesis of CsPbBr3 PQDs. It is found that rapid etching of PQDs surface by water can be hampered by slow addition of deionised water. Unlike the common use of oleic acid (OA) and oleylamine OAm as capping organic ligands, the strong acidity of HBr contributes to the removal of OA and deprotonation of OAm. Hydrophobic PMMA is further used to improve the stability of aqueous PQDs, and the synthesized CsPbBr3@PMMA aqueous solution shows near-unit photoluminescence quantum yield (PLQY) of 98.5%. As a result, when stored at room temperature for dozens of days, CsPbBr3@PMMA PQDs still maintain their excellent optical properties both in solution and as films. Furthermore, the white light-emitting diodes (WLEDs) and anti-counterfeiting patterns can be successfully fabricated using CsPbBr3@PMMA. This study offers a viable design strategy for the synthesis of all-inorganic lead halide PQDs with strong polarity tolerance and highlights their promising applications in light-emitting devices and information encryption.

Graphical abstract