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.
| Original language | English |
|---|---|
| Article number | 1192 |
| Journal | Nature Communications |
| Volume | 11 |
| Issue number | 1 |
| Early online date | 4 Mar 2020 |
| DOIs | |
| Publication status | Published - 1 Dec 2020 |
| Externally published | Yes |
Bibliographical note
Publisher Copyright:© 2020, The Author(s).
Funding
This work was financially supported by the Hong Kong Research Grants Council (General Research Fund Grant No. 15301414 and National Natural Science Foundation of China/Research Grants Council Joint Research Scheme Grant No. N_CityU108/17), the City University of Hong Kong (Project Nos. 9610456 and 9360140), the Hong Kong Polytechnic University (Grant No. 1-ZE1B), and the Croucher Foundation through a Senior Research Fellowship (A.L.R.). S.L. thanks Drs. Jianhui Sun and Xin Hu for helpful discussions.