Air-Stable Surface-Passivated Perovskite Quantum Dots for Ultra-Robust, Single- and Two-Photon-Induced Amplified Spontaneous Emission

Jun Pan, Smritakshi P. Sarmah, Murali Banavoth, Ibrahim Dursun, Wei Peng, Manas R. Parida, Jiakai Liu, Lutfan Sinatra, Noktan Mohammed AlYami, Chao Zhao, Erkki Alarousu, Tien Khee Ng, Boon S. Ooi, Osman Bakr, Omar F. Mohammed

Research output: Contribution to journalArticlepeer-review

321 Scopus citations

Abstract

We demonstrate ultra-air- and photostable CsPbBr3 quantum dots (QDs) by using an inorganic–organic hybrid ion pair as the capping ligand. This passivation approach to perovskite QDs yields high photoluminescence quantum yield with unprecedented operational stability in ambient conditions (60 ± 5% lab humidity) and high pump fluences, thus overcoming one of the greatest challenges impeding the development of perovskite-based applications. Due to the robustness of passivated perovskite QDs, we were able to induce ultrastable amplified spontaneous emission (ASE) in solution processed QD films not only through one photon but also through two-photon absorption processes. The latter has not been observed before in the family of perovskite materials. More importantly, passivated perovskite QD films showed remarkable photostability under continuous pulsed laser excitation in ambient conditions for at least 34 h (corresponds to 1.2 × 108 laser shots), substantially exceeding the stability of other colloidal QD systems in which ASE has been observed.
Original languageEnglish (US)
Pages (from-to)5027-5033
Number of pages7
JournalThe Journal of Physical Chemistry Letters
Volume6
Issue number24
DOIs
StatePublished - Dec 7 2015

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