二极管
光电子学
钙钛矿(结构)
材料科学
发光二极管
能量转移
天空
蓝光
能量密度
工程物理
化学
物理
结晶学
气象学
作者
Feifei Lu,Jianchao Dong,Jianheng Zhou,Ning Wang
标识
DOI:10.1016/j.cej.2024.149887
摘要
Metal halide perovskite materials have emerged as unique and promising candidates for full-color display and solid-state lighting applications. While substantial progress has been made in developing green, red and near-infrared perovskite light-emitting diodes (PeLEDs) with external quantum efficiency (EQE) approaching their theoretical upper limit, the performance of blue PeLEDs is still lagging far behind. Here, synergistic long and short hydrobromide chains are strategically introduced into the perovskite to regulate composition and dimensional engineering for promoting coupled quasi-two-dimensional perovskite thin films with enhanced photoluminescence quantum yield (PLQY) and reduced trap state density. The inclusion of the hydrobromide can also simultaneously passivate the perovskite defects by reducing nonradiative recombination loss and increasing the formation of n >1 phases for efficient exciton energy transfer. Encouraged by these findings, we finally demonstrate the most stable sky-blue PeLEDs to date with a half-lifetime of 515 min at high external quantum efficiency (EQE>10 %), emitting at 486 nm with a peak EQE of up to 15.6 %.
科研通智能强力驱动
Strongly Powered by AbleSci AI