Issue 27, 2024

Bright self-trapped exciton emission in alkali iodide nanocrystals via Sn(ii)-doping

Abstract

Lead-free alkali halides have gained increasing attention owing to their desired optoelectronic properties across a variety of light-emitting applications. However, state-of-the-art alkali halide emitters commonly are bulky crystals functionalized with highly toxic elemental doping, hindering their integration into emerging flexible, wearable and large-area optoelectronic devices. Herein, we have developed environmental friendly and solution-processable alkali halide nanocrystals that exhibit intense self-trapped emission facilitated by Sn2+ ionic doping. We find that the presence of Sn2+-interstitial leads to the tilting of cubic structures of RbI and thus triggers the self-trapped emission. The resultant tin(II)-doped RbI and RbxCs1−xI nanocrystals display an impressive maximum photoluminescence quantum yield of 91.9% and exhibit remarkable stability under ambient conditions. These findings pave the way for a new class of bright, solution-processable alkali halides, with diverse applications such as energy down conversion and flexible scintillation technologies.

Graphical abstract: Bright self-trapped exciton emission in alkali iodide nanocrystals via Sn(ii)-doping

Supplementary files

Article information

Article type
Paper
Submitted
07 Apr 2024
Accepted
04 Jun 2024
First published
04 Jun 2024

J. Mater. Chem. C, 2024,12, 9978-9985

Bright self-trapped exciton emission in alkali iodide nanocrystals via Sn(II)-doping

X. Wang, Z. Dou, C. Tao, G. Chen, Q. Wei, H. You, X. Liu, Y. Zou, N. Han and W. Xu, J. Mater. Chem. C, 2024, 12, 9978 DOI: 10.1039/D4TC01428F

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