期刊
ACS ENERGY LETTERS
卷 5, 期 4, 页码 1062-1069出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.9b02562
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资金
- National Natural Science Foundation of China [61904145, 61505161, 11574248]
- International Cooperation by Shaanxi [2015KW-008]
- China Postdoctoral Science Foundation [2016M590947, 2018M643652]
- Fundamental Research Funds for the Central Universities [xjj2016031]
- Natural Science Basic Research Plan of Shaanxi Province [2017JM6064]
- Scientific Research Plan Projects of Shaanxi Education Department [17JK0700]
- INCITE program by the Argonne Leadership Computing Facility [DE-AC02-06CH11357]
- CSC-IT Center for Science [ay6311]
Blue-emitting materials and their light-emitting diodes (LEDs) are always challenging in lighting and display applications. Recently, perovskite LEDs (PeLEDs) with efficient and stable green/red emission have made great progress, where external quantum efficiency (EQE) over 20% has been reached. However, it is still a big challenge to realize stable blue PeLEDs with high efficiency mainly because of the poor film quality and unreasonable device structure. Herein, a cocktail strategy, that is, multication (Cs/Rb/FA/PEA/K)Pb(Cl/Br)(3), is demonstrated to improve both the efficiency and stability of blue PeLEDs. Combined with the insulator-perovskite-insulator structure, PeLEDs based on a multication (Cs/Rb/FA/PEA/K)Pb(Cl/Br)(3) perovskite film show maximum EQE of 2.01% and maximum luminance of 4015 cd/m(2) at 484 nm. More importantly, the device exhibits robust durability, and its half-lifetime is over 300 min under continuous operation. The multication strategy could open up a new avenue for the design of new blue-emitting materials for high-performing PeLEDs.
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