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Synergistic Molecular Engineering of Hole‐Injecting Conducting Polymers Overcomes Luminescence Quenching in Perovskite Light‐Emitting Diodes
Author(s) -
Ahn Soyeong,
Kim YoungHoon,
Kim Sungjin,
Park Jinwoo,
Li Nannan,
Heo JungMin,
Kim Joo Sung,
Kim Dong Jin,
Hong Byung Hee,
Lee Jin Yong,
Lee TaeWoo
Publication year - 2021
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.202100646
Subject(s) - materials science , perovskite (structure) , luminescence , pedot:pss , electroluminescence , indium tin oxide , light emitting diode , quenching (fluorescence) , chemical engineering , optoelectronics , nanotechnology , layer (electronics) , optics , physics , engineering , fluorescence
Electroluminescence efficiency and operating stability of solution‐processed perovskite light‐emitting diodes (PeLEDs) are limited by luminescence quenching induced by indium or tin released from indium tin oxide (ITO) electrode upon deposition of highly acidic conventional hole injection layer (HIL) (i.e., poly(3,4‐ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS)) and inefficient hole injection into perovskite emitting layer. Here, a synergistic molecular strategy to develop a neutralized gradient HIL, which possesses low acidity and high work function ( WF ) simultaneously, is proposed. First, it is shown that aniline with relatively low basicity and dipole moment efficiently neutralizes HIL while maintaining its original confirmation and high WF . Both acidity‐neutralizing aniline and WF ‐modifying agent (perfluorinated ionomer) are incorporated into PEDOT:PSS to achieve high pH ≈ 6 and WF > 5.8 eV, which suppresses etching of underlying ITO and luminescence quenching while maintaining efficient hole injection into perovskite emitting layer. With this synergetic molecular engineering, high current efficiency = 52.55 cd A −1 with extended operating lifetime is achieved in PeLEDs that use colloidal formamidinium lead bromide nanoparticle films. This result provides a simple and efficient way to develop efficient and stable PeLEDs in industrial displays and solid‐state lighting.