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Highly luminescent and stable layered perovskite as the emitter for light emitting diodes
Author(s) -
Wei Mingyang,
Sun Weihai,
Liu Yang,
Liu Zhiwei,
Xiao Lixin,
Bian Zuqiang,
Chen Zhijian
Publication year - 2016
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.201600246
Subject(s) - perovskite (structure) , photoluminescence , light emitting diode , materials science , quantum yield , quantum efficiency , optoelectronics , diode , exciton , luminescence , oled , absorption (acoustics) , quantum dot , chemistry , nanotechnology , optics , crystallography , physics , condensed matter physics , composite material , layer (electronics) , fluorescence
Air instability and poor exciton recombination of 3D perovskites MAPbX 3 (MA = CH 3 NH 3 , X = halogens) seriously hinder their applications in light emitting diodes. Herein, we report a promising alternative to solve these two critical drawbacks. Layered perovskite OA 2 (MA) n −1 Pb n Br 3 n +1 (OA = C 8 H 17 NH 3 ) has higher binding energy and is passivated by long organic chain, which can be synthesized using a facile method. By increasing the OA + ratio in layered perovskite, strong quantum confinement effect and obvious features of exciton were observed in photoluminescence and UV‐Vis absorption spectra. Notably, the photoluminescence quantum yield (PLQY) of (OA) 2 (MA) 2 Pb 3 Br 10 ( n = 3 layered perovskite) can be up to 67.3% due to the enhanced exciton recombination, significantly higher than its 3D counterpart. Moreover, layered perovskite exhibits promoted stability in air than that of the 3D perovskite. The layered perovskite (OA) 2 (MA) 2 Pb 3 Br 10 ‐based perovskite light emitting diodes (PeLEDs) with a maximum current efficiency, a maximum power efficiency and the external quantum efficiency (EQE) of 1.43 cd A −1 , 0.89 lm W −1 , and 0.53% was demonstrated, which can be compared with that of the best‐reported perovskite quantum dots LEDs so far. The demonstration of layered perovskite renders its bright future in optoelectronic applications, such as displays and photodetections.