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

Jun Pan(King Abdullah University of Science and Technology), Smritakshi P. Sarmah(King Abdullah University of Science and Technology), Banavoth Murali(King Abdullah University of Science and Technology), İbrahim Dursun(King Abdullah University of Science and Technology), Wei Peng(King Abdullah University of Science and Technology), Manas R. Parida(King Abdullah University of Science and Technology), Jiakai Liu(King Abdullah University of Science and Technology), Lutfan Sinatra(King Abdullah University of Science and Technology), Noktan M. AlYami(King Abdullah University of Science and Technology), Chao Zhao(Core Laboratories (United States)), Erkki Alarousu(King Abdullah University of Science and Technology), Tien Khee Ng(King Abdullah University of Science and Technology), Boon S. Ooi(King Abdullah University of Science and Technology), Osman M. Bakr(King Abdullah University of Science and Technology), Omar F. Mohammed(King Abdullah University of Science and Technology)
The Journal of Physical Chemistry Letters
December 1, 2015
10.1021/acs.jpclett.5b02460
Cited by 518

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 × 10(8) laser shots), substantially exceeding the stability of other colloidal QD systems in which ASE has been observed.

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