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All‐Solution‐Processed Organic–Inorganic Hybrid Perovskite Light‐Emitting Diodes under Ambient Air
Author(s) -
Kim Taejun,
Kim Jin-Hoon,
Park Jin-Woo
Publication year - 2019
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201900642
Subject(s) - materials science , perovskite (structure) , nanocrystal , chemical engineering , crystallization , light emitting diode , polymer , elastomer , nanotechnology , optoelectronics , composite material , engineering
Herein, all‐solution‐processed and ambient air‐stable perovskite light‐emitting diodes (PeLEDs) based on organic–inorganic hybrid perovskite nanocrystals are fabricated. Uniform surface coverage of methylammonium lead bromide (MAPbBr 3 ) perovskite nanocrystals fabricated under ambient air conditions is achieved by blowing nitrogen (N 2 ) gas onto the surface of the perovskite–polymer‐mixed precursor solution as it is being spin‐coated and thus controlling the crystallization rate of the nanocrystals. To obtain uniform morphology, the experimental conditions are optimized, namely, the spin rate and N 2 gas blowing start time. Finally, a spin rate of 5000 rpm (revolutions per minute) and N 2 gas blowing for 10 s at 10 s after the start of spinning are found to be the optimal conditions. PeLEDs fabricated using the optimized N 2 blowing conditions provide a high maximum luminance ( L ) of approximately 11 610 cd m −2 and a current efficiency of approximately 4.42 cd A −1 at an L of 2328 cd m −2 accompanied by excellent operational stability. The PeLEDs are not only fabricated on rigid glass substrates but also on polymeric and elastomeric substrates, which demonstrates their potential application as flexible and wearable devices.