题目： | suppressing nonradiative recombination in pure red perovskites toward efficient hybrid perovskite/organic tandem white light-emitting diodes |
作者： | min zhu1,2, zhuxia wu3, tingting shi3, shuang-qiao sun1,2, ziming kuang3, qi sun1,2, yue-min xie1,2,4*, shuit-tong lee1,2,5, man-keung fung1,2,5* |
单位： | 1institute of functional nano & soft materials (funsom), jiangsu key laboratory for carbon-based functional materials & devices, soochow university, suzhou, jiangsu 215123, p. r. china. 2macao institute of materials science and engineering (mimse), must-suda joint research center for advanced functional materials, zhuhai must science and technology research institute, macau university of science and technology, taipa, macau, 999078, p. r. china. 3institute of organic optoelectronics, jiangsu industrial technology research institute (jitri), 1198 fenhu dadao, wujiang, suzhou 215200, p. r. china. 4siyuan laboratory, guangdong provincial engineering technology research center of vacuum coating technologies and new energy materials department of physics, jinan university, guangzhou, guangdong 510632, p. r. china. 5jiangsu key laboratory of advanced negative carbon technologies, soochow university, suzhou, jiangsu 215123, p. r. china. |
摘要： | perovskite light-emitting diodes (peleds) have recently attracted great interest for their superior electroluminescent properties. however, the development of pure red (620–660 nm) peleds as an essential component for display applications continues to be hampered by severe nonradiative recombination. particularly, the solution fabrication process of perovskites poses a challenge in the fabrication of white peleds, which further hinders their commercialization. herein, a novel design is reported of high-efficiency hybrid perovskite/organic tandem white light-emitting diodes (potwleds) by integrating bottom pure red (640 nm) peled units with top blue oled units. to optimize device performance, 5-bromo-2-fluoropyridine (pd) is introduced, featuring strong electronegative groups of c─n and c─f, as a pyridine passivator into pure red peleds to inhibit nonradiative recombination in the perovskites by passivating defects and improving phase purity of perovskite films, which promotes a maximum external quantum efficiency (eqe) of 20.4%. by integrating the optimized red peled units with blue oled units, efficient potwleds are obtained with high eqe values of 25.9 and 23.7% with cie coordinates of (0.279 and 0.339) and (0.310 and 0.330), respectively. these values represent the highest efficiencies reported for perovskite-based white light-emitting diodes (wleds), illustrating the great potential for solid-state lighting and display applications. |
影响因子： | 18.5 |
分区情况： | 一区 |
链接： | 责任编辑：杜欣 |
