电致发光
材料科学
发光二极管
钙钛矿(结构)
光电子学
相(物质)
蓝光
二极管
化学工程
纳米技术
有机化学
化学
工程类
图层(电子)
作者
C. Li,Pui Kei Ko,Christopher C. S. Chan,А. А. Сергеев,Dezhang Chen,Neha Tewari,Kam Sing Wong,Jonathan E. Halpert
标识
DOI:10.1002/adfm.202303301
摘要
Abstract Producing efficient blue and deep blue perovskite LEDs (PeLEDs) still represents a significant challenge in optoelectronics. Blue PeLEDs still have problems relating to color, luminance, and structural and electrical stability so new materials are needed to achieve better performance. Recent reports suggest using low n states ( n = 1, 2, 3) to achieve blue electroluminescence in Ruddlesden–Popper (RP) perovskite films. However, there are fewer reports on the other quasi‐2D structure, Dion–Jacobson (DJ) perovksites, despite their highly desirable optical properties, due to the difficulty in achieving charge injection. To resolve this issue, herein, w e have mixed DJ phase precursors, propane‐1,3‐diammonium (PDA) bromide into RP phase perovskites and fabricated low‐dimensional PeLEDs. It is found that these specific precursors aid in suppressing both the low n ( n = 1) and high n ( n ≥ 4) quasi‐2D RP phases and is an effective strategy in blue‐shifting sky‐blue RP perovskites into the sub‐470 nm region. With optimization of the PDA concentration and device layers, it is achieved an external quantum efficiency of 1.5% at 469 nm and stable electroluminescence for the first deep blue PeLED to be reported using DJ perovskites.
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