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

Siqi Li, Dangyuan Lei (), Wei Ren, Xuyun Guo, Shengfan Wu, Ye Zhu, Andrey L. Rogach, Manish Chhowalla and Alex K.-Y. Jen
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Siqi Li: The Hong Kong Polytechnic University
Dangyuan Lei: The Hong Kong Polytechnic University
Wei Ren: The Hong Kong Polytechnic University
Xuyun Guo: The Hong Kong Polytechnic University
Shengfan Wu: City University of Hong Kong
Ye Zhu: The Hong Kong Polytechnic University
Andrey L. Rogach: City University of Hong Kong
Manish Chhowalla: University of Cambridge
Alex K.-Y. Jen: City University of Hong Kong

Nature Communications, 2020, vol. 11, issue 1, 1-8

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.

Date: 2020
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DOI: 10.1038/s41467-020-15016-2

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