Open AccessNarrowing the Phase Distribution of Quasi‐2D Perovskites for Stable Deep‐Blue Electroluminescence
Author(s) -
Nah Yoonseo,
Solanki Devan,
Dong Yitong,
Röhr Jason A.,
Taylor André D.,
Hu Shu,
Sargent Edward H.,
Kim Dong Ha
Publication year - 2022
Publication title -
advanced science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.388
H-Index - 100
ISSN - 2198-3844
DOI - 10.1002/advs.202201807
Subject(s) - perovskite (structure) , electroluminescence , materials science , optoelectronics , phase (matter) , diode , light emitting diode , photoluminescence , optics , nanotechnology , chemistry , physics , layer (electronics) , crystallography , organic chemistry
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.