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Haze‐Suppressed Transparent Electrodes Using IZO/Ag/IZO Nanomesh for Highly Flexible and Efficient Blue Organic Light‐Emitting Diodes
Author(s) -
Lee Ho Jin,
Kim BoHyun,
Takaloo Ashkan Vakilipour,
Son Kyung Rock,
Dongale Tukaram D.,
Lim Kyoung Moon,
Kim Tae Geun
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.202002010
Subject(s) - materials science , optoelectronics , oled , sheet resistance , nanomesh , electrode , indium tin oxide , nanotechnology , graphene , thin film , layer (electronics) , chemistry
Nano‐mesh (NM) structures have been employed as flexible and stretchable electrodes for organic light‐emitting diodes (OLEDs). However, high optical haze induced by NM structures should be diminished while enhancing the transparency and lowering the sheet resistance simultaneously for their practical use. Herein, a highly flexible transparent electrode is demonstrated using indium zinc oxide (IZO)/Ag/IZO NM structure to satisfy all these requirements without complex designs in NM structures. The proposed NM electrode shows remarkably low haze (<10%), high optical transparency (>90%), and low sheet resistance (≈9.4 Ω sq –1 ), together with superior flexibility. Moreover, the smart NM‐based blue OLED shows characteristics of a Lambertian light source, with high external quantum efficiency (≈18.8%) and unprecedentedly outstanding bending properties. The experimental and theoretical analyses ascribe these improvements to the enhanced charge injection via conductive IZO with high work function as well as reduced surface reflection and diffraction of emitted light via anti‐reflective NM structure.