Low-Threshold Blue Quasi-2D Perovskite Laser through Domain Distribution Control.
basic_science · Level V
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- Record sourced from PubMed, PMID 35049298.
- Also identified by DOI 10.1021/acs.nanolett.1c04666.
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Abstract
Quasi-2D perovskites, composed of self-organized quantum well structures, are emerging as gain materials for laser applications. Here we investigate the influence of domain distribution on the laser emission of CsPbCl<sub>1.5</sub>Br<sub>1.5</sub>-based quasi-2D perovskites. The use of 2,2-diphenylethylammonium bromide (DPEABr) as a ligand enables the formation of quasi-2D film with a large-<i>n</i>-dominated narrow domain distribution. Due to the reduced content of small-<i>n</i> domains, the incomplete energy transfer from small-<i>n</i> to large-<i>n</i> domains can be greatly addressed. Moreover, the photoinduced carriers can be concentrated on most of the large-<i>n</i> domains to reduce the local carrier density, thereby suppressing the Auger recombination. By controlling the domain distribution, we achieve blue amplified spontaneous emission and single-mode vertical-cavity surface-emitting lasing with low thresholds of 6.5 and 9.2 μJ cm<sup>-2</sup>, respectively. This work provides a guideline to design the domain distribution to realize low-threshold multicolor perovskite lasers.