Journal
NANO LETTERS
Volume 17, Issue 12, Pages 7424-7432Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.7b03272
Keywords
Perovskites; quantum dots; ligand coordination; light emission; lasing; optoelectronics
Categories
Funding
- National Research Foundation, Prime Minister's Office, Singapore under Competitive Research Programme (CRP) [NRF-CRP14-2014-03]
- Ministry of Education [RG101/15, RG173/16, MOE2015-T2-2-015, MOE2016-T2-1-034]
Ask authors/readers for more resources
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 mu J 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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available