Issue 1, 2024

Enhancing broadband blue luminescence efficiency and stability in Bi3+-doped Cs2ZnCl4 nanocrystals from STEs and advancing energy applications

Abstract

Lead-halide perovskites exhibit excellent photovoltaic properties. However, lead's toxicity and limited stability under ambient conditions limit its further commercialization. This paper reports a Bi3+-doped lead-free metal halide, Cs2ZnCl4:Bi3+ nanocrystals (NCs). After doping with Bi3+, the pristine weakly luminescent nanocrystals showed highly efficient broadband blue emission with a peak position of 445 nm, a full width at half-maximum (FWHM) of 92 nm, and a significant increase in the photoluminescence quantum yield (PLQY) to 57.71%. The formation of a water-induced protective layer of BiOCl ensures good water stability. The luminescence mechanism of Cs2ZnCl4:Bi3+ NCs has been investigated by optical characterization and density-functional theory (DFT) calculations, and it has been concluded that the emission of triple-state self-trapped excitons (STEs) induced by Bi3+ doping is the source of broadband blue light emission. Combining nanocrystals as a luminescence down-shifting (LDS) layer with commercial GaAs solar cell devices has solved the problem of the solar cell's weak absorption of short waves, augmenting the photovoltaic conversion efficiency (PCE) by approximately 1%. Additionally, the integration of Cs2ZnCl4:Bi3+ NCs with 365 nm commercial LED chips enables the creation of broadband blue-emitting LED devices. Therefore, we believe that Cs2ZnCl4:Bi3+ NCs have great potential for future optoelectronic applications.

Graphical abstract: Enhancing broadband blue luminescence efficiency and stability in Bi3+-doped Cs2ZnCl4 nanocrystals from STEs and advancing energy applications

Supplementary files

Article information

Article type
Research Article
Submitted
10 Okt 2023
Accepted
21 Nov 2023
First published
25 Nov 2023

Inorg. Chem. Front., 2024,11, 71-84

Enhancing broadband blue luminescence efficiency and stability in Bi3+-doped Cs2ZnCl4 nanocrystals from STEs and advancing energy applications

X. Zhao, X. Zhang, X. Gong, X. Yuan, M. Chen, S. Huang, B. Zhou, J. Xu and L. Li, Inorg. Chem. Front., 2024, 11, 71 DOI: 10.1039/D3QI02077K

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