Issue 1, 2022

Implications of gas-barrier properties in realizing the self-recovery of photodegraded CsPbBr3 perovskite nanocrystals

Abstract

Fluorescent CsPbBr3 perovskite nanocrystals (NCs) degraded by photoinduced desorption of surface ligands can exhibit self-recovery; however, irreversible oxidative damage from oxygen in the atmosphere must be avoided. In this work, gas-barrier polymer films made of ethylene vinyl alcohol (EVOH) and ethylene vinyl acetate (EVA) copolymers were investigated as sealing materials for CsPbBr3 NC films. The NC film covered with EVOH showed photodegradation with blackening and photoluminescence quenching under light excitation, while self-recovery of the optical properties was observed during dark storage. These phenomena were attributed to the photoinduced desorption of surface ligands (and thus the formation of surface defects) and their re-adsorption, respectively. In contrast, self-recovery did not occur when an EVA film was used. X-ray photoelectron spectroscopy indicated the formation of Pb–O bonds for the EVA-coated film. Thus, EVOH, which has a lower oxygen permeability than EVA, successfully prevented irreversible damage by permeated oxygen. This is an important finding for the reuse or lifetime-extension of CsPbBr3 NCs.

Graphical abstract: Implications of gas-barrier properties in realizing the self-recovery of photodegraded CsPbBr3 perovskite nanocrystals

Supplementary files

Article information

Article type
Communication
Submitted
21 Oct 2021
Accepted
01 Dec 2021
First published
10 Dec 2021
This article is Open Access
Creative Commons BY license

J. Mater. Chem. C, 2022,10, 102-107

Implications of gas-barrier properties in realizing the self-recovery of photodegraded CsPbBr3 perovskite nanocrystals

I. Enomoto, Y. Iso and T. Isobe, J. Mater. Chem. C, 2022, 10, 102 DOI: 10.1039/D1TC05077J

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