Narrowing the Phase Distribution of Quasi-2D Perovskites for Stable Deep-Blue Electroluminescence
- 주제(키워드) antisolvent engineering , blue light-emitting diodes , deep-blue electroluminescence , energy landscape , evaporation kinetics , quantum well dispersity , quasi-2D perovskites
- 등재 SCIE, SCOPUS
- OA유형 All Open Access, Green
- 발행기관 John Wiley and Sons Inc
- 발행년도 2022
- 총서유형 Journal
- URI http://www.dcollection.net/handler/ewha/000000193652
- 본문언어 영어
- Published As https://doi.org/10.1002/advs.202201807
- PubMed https://pubmed.ncbi.nlm.nih.gov/35794429
초록/요약
Solution-processed quasi-2D perovskites contain multiple quantum wells with a broad width distribution. Inhomogeneity results in the charge funneling into the smallest bandgap components, which hinders deep-blue emission and accelerates Auger recombination. Here, a synthetic strategy applied to a range of quasi-2D perovskite systems is reported, that significantly narrows the quantum well dispersity. It is shown that the phase distribution in the perovskite film is significantly narrowed with controlled, simultaneous evaporation of solvent and antisolvent. Modulation of film formation kinetics of quasi-2D perovskite enables stable deep-blue electroluminescence with a peak emission wavelength of 466 nm and a narrow linewidth of 14 nm. Light emitting diodes using the perovskite film show a maximum luminance of 280 cd m–2 at an external quantum efficiency of 0.1%. This synthetic approach will serve in producing new materials widening the color gamut of next-generation displays. © 2022 The Authors. Advanced Science published by Wiley-VCH GmbH.
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