Ke You, Wang Nana, Kong Decheng, Cao Yu, He Yarong, Zhu Lin, Wang Yuming, Xue Chen, Peng Qiming, Gao Feng, Huang Wei, Wang Jianpu
Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM) , Nanjing Tech University (NanjingTech) , 30 South Puzhu Road , Nanjing 211816 , China.
Department of Physics, Chemistry and Biology (IFM) , Linköping University , Linköping SE-58183 , Sweden.
J Phys Chem Lett. 2019 Feb 7;10(3):380-385. doi: 10.1021/acs.jpclett.8b03664. Epub 2019 Jan 11.
Efficient and stable red perovskite light-emitting diodes (PeLEDs) are important for realizing full-color display and lighting. Red PeLEDs can be achieved either by mixed-halide or low-dimensional perovskites. However, the device performance, especially the brightness, is still low owing to phase separation or poor charge transport issues. Here, we demonstrate red PeLEDs based on three-dimensional (3D) mixed-halide perovskites where the defects are passivated by using 5-aminovaleric acid. The red PeLEDs with an emission peak at 690 nm exhibit an external quantum efficiency of 8.7% and a luminance of 1408 cd m. A maximum luminance of 8547 cd m can be further achieved as tuning the emission peak to 662 nm, representing the highest brightness of red PeLEDs. Moreover, those LEDs exhibit a half-life of up to 8 h under a high constant current density of 100 mA cm, which is over 10 times improvement compared to literature results.
高效且稳定的红色钙钛矿发光二极管（PeLEDs）对于实现全彩显示和照明至关重要。红色PeLEDs可以通过混合卤化物或低维钙钛矿来实现。然而，由于相分离或电荷传输不佳的问题，器件性能，尤其是亮度仍然很低。在此，我们展示了基于三维（3D）混合卤化物钙钛矿的红色PeLEDs，其中使用5-氨基戊酸对缺陷进行了钝化。发射峰位于690 nm的红色PeLEDs表现出8.7%的外量子效率和1408 cd m的亮度。将发射峰调至662 nm时，可进一步实现8547 cd m的最大亮度，这代表了红色PeLEDs的最高亮度。此外，这些发光二极管在100 mA cm的高恒定电流密度下表现出长达8小时的半衰期，与文献结果相比提高了10倍以上。
