材料科学
钝化
量子效率
钙钛矿(结构)
光电子学
深蓝色
发光二极管
二极管
光致发光
光化学
纳米技术
化学
有机化学
图层(电子)
作者
Muxue Zeng,Dan Chen,Junjie Wang,Danyang Li,Gaozhan Xie,Jun‐Yu Ou,Lei Wang,Jian Wang
标识
DOI:10.1021/acsami.3c05253
摘要
The external quantum efficiency (EQE) of the sky-blue perovskite light-emitting diodes (PeLEDs) has reached 18.65%. However, the EQE of the deep-blue PeLEDs is still inferior to that of sky-blue PeLEDs, which restricts the PeLED application in displays. Herein, a novel dynamic interfacial ion-exchange technique is developed to obtain deep-blue PeLEDs. By spin-coating quaternary ammonium chloride on top of a quasi-2D green perovskite film, a 68 nm spectral transition from green light emission at 513 nm to deep-blue light emission at 445 nm has been successfully realized. To the best of our knowledge, it is the largest spectrum transition ever achieved. By further introducing tricyclohexylphosphine oxide into the perovskite precursor solution to passivate defects, high-quality deep-blue PeLEDs have been fabricated with color coordinates at (0.13, 0.06). The maximum EQE reaches 1.8%, and the peak luminance reaches 847 cd/m2.
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