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Title: Benzyl alcohol-treated CH3NH3PbBr3 nanocrystals exhibiting high luminescence, stability, and ultralow amplified spontaneous emission thresholds
Authors: Veldhuis, Sjoerd Antonius
Tay, Eugene Yong Kang
Bruno, Annalisa
Dintakurti, Sai S. H.
Bhaumik, Saikat
Muduli, Subas Kumar
Li, Mingjie
Mathews, Nripan
Sum, Tze Chien
Mhaisalkar, Subodh Gautam
Keywords: Science::Physics
Issue Date: 2017
Source: Veldhuis, S. A., Tay, E. Y. K., Bruno, A., Dintakurti, S. S. H., Bhaumik, S., Muduli, S. K., . . . Mhaisalkar, S. G. (2017). Benzyl alcohol-treated CH3NH3PbBr3 nanocrystals exhibiting high luminescence, stability, and ultralow amplified spontaneous emission thresholds. Nano Letters, 17(12), 7424-7432. doi:10.1021/acs.nanolett.7b03272
Journal: Nano Letters
Abstract: We report the high yield synthesis of about 11 nm sized CH3NH3PbBr3 nanocrystals with near-unity photoluminescence quantum yield. The nanocrystals are formed in the presence of surface-binding ligands through their direct precipitation in a benzyl alcohol/toluene phase. The benzyl alcohol plays a pivotal role in steering the surface ligands binding motifs on the NC surface, resulting in enhanced surface-trap passivation and near-unity PLQY values. We further demonstrate that thin films from purified CH3NH3PbBr3 nanocrystals are stable >4 months in air, exhibit high optical gain (about 520 cm-1), and display stable, ultralow amplified spontaneous emission thresholds of 13.9 ± 1.3 and 569.7 ± 6 μJ cm-2 at one-photon (400 nm) and two-photon (800 nm) absorption, respectively. To the best of our knowledge, the latter signifies a 5-fold reduction of the lowest reported threshold value for halide perovskite nanocrystals to date, which makes them ideal candidates for light-emitting and low-threshold lasing applications.
ISSN: 1530-6984
DOI: 10.1021/acs.nanolett.7b03272
Rights: This document is the Accepted Manuscript version of a Published Work that appeared in final form in Nano Letters, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see
Fulltext Permission: open
Fulltext Availability: With Fulltext
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