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调制“鸡尾酒”式的多重阳离子钙钛矿实现高效且高稳定的蓝光二极管（袁方 ACS Energy Lett. 2020, 5, 1062−1069 ）
发布者: 吴朝新 | 2020-03-20 | 6162

 

A Cocktail of Multiple Cations in Inorganic Halide Perovskite toward Effiffifficient and Highly Stable Blue Light-Emitting Diodes

 

Fang Yuan, Chenxin Ran, Lin Zhang, Hua Dong, Bo Jiao, Xun Hou, Jingrui Li, and Zhaoxin Wu*

 

 

Blue-emitting materials and their light-emitting diodes (LEDs) are always challenging in lighting and display applications. Recently, perovskite LEDs (PeLEDs) with effiffifficient and stable green/ red emission have made great progress, where external quantum effiffifficiency (EQE) over 20% has been reached. However, it is still a big challenge to realize stable blue PeLEDs with high effiffifficiency mainly because of the poor fifilm 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 effiffifficiency 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 fifilm show maximum EQE of 2.01% and maximum luminance of 4015 cd/m2 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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