Journal
OPTICAL MATERIALS EXPRESS
Volume 8, Issue 4, Pages 909-918Publisher
OPTICAL SOC AMER
DOI: 10.1364/OME.8.000909
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Funding
- Natural National Science Foundation of China (NSFC) [11564026, 61366003, 61765011, 11774141, 21563013]
- Natural Science Foundation of Jiangxi Province [20151BBE50114, 20151BAB212001, 20171BAB202036, 20161BAB212035]
- Outstanding Youth Funds of Jiangxi Province [20171BCB23051, 20171BCB23052]
- Science and Technology Project of the education department of Jiangxi Province [GJJ150727, GJJ160681]
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Electron transport and electron-hole balance are the essential processes that determine the efficiency and luminance of quantum dot light emitting diodes (QLEDs). Those structures with a good capability of fast electron transport and charge balance are needed. We developed a novel composite electron transport layer (ETL) consisting of zinc oxide (ZnO) and zinc magnesium oxide (ZnMgO) nanoparticles for the QLED devices, which can enhance EQE to 13.5%. It is 1.29 times and 1.33 times compared with that of pure ZnO and ZnMgO nanoparticles, respectively. The luminance intensity was increased up to 22100 cd/m(2) at a voltage of 8.8 V. The current-voltage of electron-only devices measurement results indicate that the composite ETL generates higher current than the nano-particulate ZnMgO layer. Meanwhile, the QLEDs with ZnMgO: ZnO ETLs exhibit lower leakage current densities at the turn on voltage than that with pure ZnO ETL. Transient measurement results indicate that the composite ETL can keep a charge balance more effectively than a conventional ZnO nano-particulate layer. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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