In:
Communications Chemistry, Springer Science and Business Media LLC, Vol. 3, No. 1 ( 2020-02-07)
Abstract:
Cesium lead halide perovskite (CsPbX 3 , X=Cl, Br, I) nanocrystals embedded in Cs 4 PbX 6 or CsPb 2 X 5 matrices have received interests due to their excellent optical properties. However, their precise endotaxial structures are not known, and the origin of photoluminescence remains controversial. Here we report a sonochemistry technique that allowed us to synthesize high-quality CsPbBr 3 -based microcrystals in all ternary phases, simply by adjusting precursor concentrations in a polar aprotic solvent, N,N-dimethylformamide. The microcrystals with diverse morphologies enabled us to visualize the lattice alignments in the dual-phase composites and confirm CsPbBr 3 nanocrystals being the photoluminescent sites. We demonstrate high solid-state quantum yield of 〉 40% in Cs 4 PbBr 6 /CsPbBr 3 and lasing of CsPbBr 3 microcrystals as small as 2 µm in size. Real-time optical analysis of the reaction solutions provides insights into the formation and phase transformation of different CsPbBr 3 -based microcrystals.
Type of Medium:
Online Resource
ISSN:
2399-3669
DOI:
10.1038/s42004-020-0265-6
Language:
English
Publisher:
Springer Science and Business Media LLC
Publication Date:
2020
detail.hit.zdb_id:
2929562-2
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