期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 900, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2021.163481
关键词
All-solution-process; Organic light-emitting diodes; ZnS QDs; Electron injection layer; Injection energy barrier
资金
- National Key Research and Development Program of China [2016YFB0401303]
In this study, an all-solution-processed multi-layer green phosphorescent organic light-emitting diodes (OLEDs) using zinc sulfide quantum dots (ZnS QDs) based electron injection layer (EIL) were demonstrated. By utilizing a proper work function ZnS QDs EIL and inserting a PEI interlayer, efficient electron injection and solvent resistance were achieved, leading to a significant improvement in current efficiency.
We have demonstrated an all-solution-processed multi-layer green phosphorescent organic light-emitting diodes(OLEDs) using zinc sulfide quantum dots (ZnS QDs) based electron injection layer (EIL) in the conventional device structure. The ZnS QDs EIL with proper work function offers efficient electron injection and retains the solvent resistance to the adjacent electron transportation layer. By inserting of a poly-ethyleneimine(PEI) interlayer between the emitting layer and electron transportation layer, solvent can be prevented from permeating through the emissive layers beneath and no additional injection barrier is formed. Thereby, the allsolution-processed OLED with a ZnS QDs EIL exhibits a highest current efficiency of 12.5 cd A-1 based on the PVK: Ir(ppy)3 emitter, achieving a 27.6% improvement in comparison to the reference without a ZnS QDs EIL. Our results provide a facile approach for the development of all-solution-processed OLEDs. (c) 2021 Elsevier B.V. All rights reserved.
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