Benzyl Alcohol-Treated CH<sub>3</sub>NH<sub>3</sub>PbBr<sub>3</sub> Nanocrystals Exhibiting High Luminescence, Stability, and Ultralow Amplified Spontaneous Emission Thresholds.
basic_science · Level V
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- Record sourced from PubMed, PMID 29125763.
- Also identified by DOI 10.1021/acs.nanolett.7b03272.
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Abstract
We report the high yield synthesis of about 11 nm sized CH<sub>3</sub>NH<sub>3</sub>PbBr<sub>3</sub> 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 CH<sub>3</sub>NH<sub>3</sub>PbBr<sub>3</sub> nanocrystals are stable >4 months in air, exhibit high optical gain (about 520 cm<sup>-1</sup>), and display stable, ultralow amplified spontaneous emission thresholds of 13.9 ± 1.3 and 569.7 ± 6 μJ cm<sup>-2</sup> 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.