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24.1% External Quantum Efficiency of Flexible Quantum Dot Light‐Emitting Diodes by Light Extraction of Silver Nanowire Transparent Electrodes
Author(s) -
Ding Ke,
Fang Yunsheng,
Dong Shaohua,
Chen Hongting,
Luo Beibei,
Jiang Kui,
Gu Honggang,
Fan Lianwei,
Liu Shiyuan,
Hu Bin,
Wang Lei
Publication year - 2018
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.201800347
Subject(s) - materials science , optoelectronics , indium tin oxide , quantum dot , quantum efficiency , electrode , diode , substrate (aquarium) , nanowire , light emitting diode , nanotechnology , layer (electronics) , physics , oceanography , geology , quantum mechanics
Abstract Flexible quantum dot light‐emitting diodes (FQLEDs) always suffer poor performance, and current efforts towards performance improvement need complicated procedures but still ending with limited progress. An extremely efficient and simply structured FQLED is demonstrated profited from the substantially enhanced light outcoupling efficiency by employing solution‐processed flexible silver nanowires (AgNWs) transparent conductive electrodes (TCEs). As is uncovered by rigorous simulations, AgNWs TCEs extract enormous light trapped in the substrate mode and waveguide mode compared with indium tin oxide (ITO) TCEs, which greatly agrees with the experimental measurements in this work. As an ultimate achievement, the FQLED shows the record‐breaking maximum external quantum efficiency of 24.1% and current efficiency of 19.5 cd A −1 , giving a ≈4.4 and 3 times efficiency improvement compared to the rigid QLED with glass/ITO, respectively. This study not only demonstrates the prominent role of network‐based TCEs for efficient ITO‐free FQLEDs, but also shows a lot of room for further performance improvement of flexible light‐emitting devices with the guideline of light extraction by solution‐processed electrodes.