Narrowing the Phase Distribution of Quasi-2D Perovskites for Stable Deep-Blue Electroluminescence

Yoonseo Nah, Devan Solanki, Yitong Dong, Jason A. Röhr, André D. Taylor, Shu Hu, Edward H. Sargent, Dong Ha Kim

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

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.

Original languageEnglish
Article number2201807
JournalAdvanced Science
Volume9
Issue number24
DOIs
StatePublished - 25 Aug 2022

Bibliographical note

Funding Information:
This work was supported by National Research Foundation (NRF) of Korea Grant funded by the Korean Government (2020R 1A 2C 3003958), by Basic Science Research Program through the NRF of Korea funded by the Ministry of Education (2021R1A6A1A10039823), and by Korea Basic Science Institute (National Research Facilities and Equipment Center) grant funded by the Ministry of Education (2020R 1A 6C 101B194). S.H. acknowledges the financial support provided by the Division of Chemical Sciences, Geosciences and Biosciences, Office of Basic Energy Sciences, of the U.S. Department of Energy through grant no. DE‐SC0021953.

Publisher Copyright:
© 2022 The Authors. Advanced Science published by Wiley-VCH GmbH.

Keywords

  • antisolvent engineering
  • blue light-emitting diodes
  • deep-blue electroluminescence
  • energy landscape
  • evaporation kinetics
  • quantum well dispersity
  • quasi-2D perovskites

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