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Water-resistant perovskite nanodots enable robust two-photon lasing in aqueous environment

Published version
Peer-reviewed

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Authors

Li, Siqi 
Ren, Wei 
Wu, Shengfan 

Abstract

Abstract: Owing to their large absorption cross-sections and high photoluminescence quantum yields, lead halide perovskite quantum dots (PQDs) are regarded as a promising candidate for various optoelectronics applications. However, easy degradation of PQDs in water and in a humid environment is a critical hindrance for applications. Here we develop a Pb-S bonding approach to synthesize water-resistant perovskite@silica nanodots keeping their emission in water for over six weeks. A two-photon whispering-gallery mode laser device made of these ultra-stable nanodots retain 80% of its initial emission quantum yield when immersed in water for 13 h, and a two-photon random laser based on the perovskite@silica nanodots powder could still operate after the nanodots were dispersed in water for up to 15 days. Our synthetic approach opens up an entirely new avenue for utilizing PQDs in aqueous environment, which will significantly broaden their applications not only in optoelectronics but also in bioimaging and biosensing.

Description

Keywords

Article, /639/301/1019, /639/624/1020, article

Journal Title

Nature Communications

Conference Name

Journal ISSN

2041-1723

Volume Title

11

Publisher

Nature Publishing Group UK
Sponsorship
Research Grants Council, University Grants Committee (RGC, UGC) (15301414)