Issue 42, 2022

Greatly enhanced stability of CsPbBr3@PbBrOH through water induction

Abstract

In this paper, CsPbBr3@PbBrOH-1 (Cs-1) was synthesized at room temperature, and then CsPbBr3@PbBrOH-2 (Cs-2) with good stability was successfully synthesized by a water induction technique. The introduction of water can promote the conversion of a CsPbBr3 perovskite exposed on the sample surface to PbBrOH and further promote the isolation of CsPbBr3 quantum dots (QDs) inside the sample from the environment. PbBrOH-coated CsPbBr3 QDs have a clear crystal fringe and a good crystal structure. Under an optimum 367 nm excitation, Cs-1 and Cs-2 show excellent green emissions at ∼520 nm and ∼519 nm, respectively. The lifetime value of Cs-2 was determined to be ∼1.55 ns, which is slightly longer than that of Cs-1 of ∼1.31 ns. The photoluminescence quantum yield (PLQY) of the Cs-2 powder reached 52%. CsPbBr3@PbBrOH greatly improves the stability of CsPbBr3 QDs and possesses excellent polar solvent stability, photostability, thermal stability and thermal cycling stability. CsPbBr3@PbBrOH with superior luminescence properties and stability would be expected to be widely used in lighting and display areas.

Graphical abstract: Greatly enhanced stability of CsPbBr3@PbBrOH through water induction

Article information

Article type
Paper
Submitted
07 août 2022
Accepted
02 oct. 2022
First published
14 oct. 2022

J. Mater. Chem. C, 2022,10, 15843-15850

Greatly enhanced stability of CsPbBr3@PbBrOH through water induction

J. Li, G. Liu, Y. Lu and Z. Liu, J. Mater. Chem. C, 2022, 10, 15843 DOI: 10.1039/D2TC03322D

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