Congyang Zhang,Bo Wang,Weilin Zheng,Shouqiang Huang,Long Kong,Zhichun Li,Gufeng He,Liang Li
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 CsPbBr 3 Pe-QLEDs have been realized with the performance of a luminance of 1661 cd/m 2 , 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.
Qin Zhao,Yuhang Zhang,Guiru Sun,Lina Cong,Liqun Sun,Haiming Xie,Jia Liu
Developing a long-term stable electrolyte is one of the most enormous challenges for Li–O2 batteries. Equally, the high flammability of frequently used solvents seriously weakens the electrolyte safety in Li–O2 batteries, which inevitably restricts their commercial applications. Here, a binary mixture of highly concentrated tetraglyme electrolyte (HCG4) and 1,1,2,2-tetrafluoroethyl 2,2,3,3-tetrafluoropropyl ether (TTE) was used for a novel electrolyte (HCG4/TTE) in Li–O2 batteries, which exhibit good wettability, enhanced ionic conductivity, considerable nonflammability, and high electrochemical stability. Being a co-solvent, TTE can contribute to increasing ionic conductivity and to improving flame retardance of the as-prepared electrolyte. The cell with this novel electrolyte displays an enhanced cycling stability, resulting from the high electrochemical stability during cycling and the formation of electrochemically stable interfaces prevents parasitic reactions occurring on the Li anode. These results presented here demonstrate a novel electrolyte with a high electrochemical stability and considerable safety for Li–O2 batteries.
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