Hydrofluoroethers as orthogonal solvents for all-solution processed perovskite quantum-dot light-emitting diodes

Recently, metal halide perovskite quantum dots (QDs) have been becoming a kind of promising efficient luminescent material and drawn remarkable attention in the development of light-emitting devices. However, during the fabrication process of perovskite QDs based light emitting diodes (Pe-QLED), the...

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Bibliographic Details
Published in:Nano energy 2018-09, Vol.51, p.358-365
Main Authors: Zhang, Congyang, Wang, Bo, Zheng, Weilin, Huang, Shouqiang, Kong, Long, Li, Zhichun, He, Gufeng, Li, Liang
Format: Article
Language:English
Subjects:
Hydrofluoroethers
Light-emitting diodes
Orthogonal solvent
Perovskite
Quantum dots
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Summary:Recently, metal halide perovskite quantum dots (QDs) have been becoming a kind of promising efficient luminescent material and drawn remarkable attention in the development of light-emitting devices. However, during the fabrication process of perovskite QDs based light emitting diodes (Pe-QLED), the vacuum processing is necessary for constructing of perovskite QDs/charge transport layer (CTL) structure. Taking the large-scale production into consideration, the all-solution processed Pe-QLED have great potential, but remain great challenge. Herein, we show that by employing hydrofluoroethers (such as HFE 7100) as the orthogonal solvent, the perovskite QDs/CTL multilayer structure can be effectively obtained via solution process, thus promoting the successful fabrication of all-solution Pe-QLED. Through the surface fluorous ligand modification, ZnO nanoparticles (NPs) are directly dispersed in HFE 7100 and used for solution processed electron transport layer. As the result, all-solution processed CsPbBr3 Pe-QLEDs have been realized with the performance of a luminance of 1661 cd/m2, a peak EQE of 0.37%, and a peak CE of 0.72 cd/A. These results indicate that our strategy is highly effective in the development of high-performance all-solution processed perovskite based optoelectronic devices. [Display omitted] •Hydrofluoroethers (HFE 7100) are demonstrated absolutely benign to perovskite QDs.•The ZnO NPs can be dispersed in HFE 7100 for ETL deposition by solution process.•All-solution processed Pe-QLEDs ware prepared with HFE 7100 as orthogonal solvent.•Our LED shows good performance with luminance and peak EQE of 1661 cd/m2 and 0.37%.
ISSN:2211-2855
DOI:10.1016/j.nanoen.2018.06.056