Issue 20, 2023

Solid-state synthesis of cesium manganese halide nanocrystals in glass with bright and broad red emission for white LEDs

Abstract

Recently, lead halide perovskite nanocrystals (NCs) have attracted extensive attention due to their unique optical properties. However, the toxicity of lead and the instability to moisture obstruct their further commercial development. Herein, a series of lead-free CsMnX3 (X = Cl, Br, and I) NCs embedded in glasses were synthesized by a high temperature solid-state chemistry method. These NCs embedded in glass can remain stable after soaking in water for 90 days. It is found that increasing the amount of cesium carbonate in the synthesis process can not only prevent the oxidation of Mn2+ to Mn3+ and promote the transparency of glass in the 450–700 nm region, but also significantly increase its photoluminescence quantum yield (PLQY) from 2.9% to 65.1%, which is the highest reported value of the red CsMnX3 NCs so far. Using CsMnBr3 NCs with a red emission peak at 649 nm and full-width-at-half-maximum (FWHM) of 130 nm as the red light source, a white light-emitting diode (LED) device with International Commission on illumination (CIE) coordinates of (0.33, 0.36) and a color rendering index (CRI) of 94 was obtained. These findings, together with future research, are likely to yield stable and bright lead-free NCs for the next generation of solid-state lighting.

Graphical abstract: Solid-state synthesis of cesium manganese halide nanocrystals in glass with bright and broad red emission for white LEDs

Supplementary files

Article information

Article type
Edge Article
Submitted
27 févr. 2023
Accepted
15 avr. 2023
First published
17 avr. 2023
This article is Open Access

All publication charges for this article have been paid for by the Royal Society of Chemistry
Creative Commons BY-NC license

Chem. Sci., 2023,14, 5309-5315

Solid-state synthesis of cesium manganese halide nanocrystals in glass with bright and broad red emission for white LEDs

G. Xu, C. Wang, Y. Li, W. Meng, G. Luo, M. Peng, B. Xu and Z. Deng, Chem. Sci., 2023, 14, 5309 DOI: 10.1039/D3SC01084H

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