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Morphology Engineering for High‐Performance and Multicolored Perovskite Light‐Emitting Diodes with Simple Device Structures
Author(s) -
Wang Zhibin,
Cheng Tai,
Wang Fuzhi,
Dai Songyuan,
Tan Zhan'ao
Publication year - 2016
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201601785
Subject(s) - perovskite (structure) , photoluminescence , materials science , pedot:pss , polystyrene sulfonate , halide , quantum yield , scanning electron microscope , optoelectronics , light emitting diode , spin coating , electroluminescence , indium tin oxide , thin film , chemical engineering , nanotechnology , optics , fluorescence , chemistry , composite material , inorganic chemistry , layer (electronics) , physics , engineering
The film morphology is extremely significant for solution processed perovskite devices. Through fine morphology engineering without using any additives or further posttreatments, a full‐coverage and high quantum yield perovskite film has been achieved based on one‐step spin‐coating method. The morphologies and film characteristics of MAPbBr 3 with different MABr:PbBr 2 starting material ratios are in‐depth investigated by scanning electron microscopy, atomic force microscopy, X‐ray diffraction, photoluminescence, and time resolved photoluminescence. High performance organometal halide perovskite light‐emitting didoes (PeLEDs) based on simple device structure of indium tin oxide/poly(3,4‐ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS)/perovskite/TPBi/Ca/Al are demonstrated. The green PeLED based on MAPbBr 3 shows a maximum luminance of 8794 cd m −2 (at 7.3 V) and maximum current efficiency of 5.1 cd A −1 (at 5.1 V). Furthermore, a class of hybrid PeLEDs by adjusting the halide ratios of methylammonium lead halide (MAPb X 3 , where X is Cl, Br, or I) are also demonstrated at room temperature. These mix‐halogenated PeLEDs show bright luminance (above 100 cd m − 2 ) with narrow and clean emission bands over the wide color gamut.