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| DOI | 10.1016/j.scib.2021.04.033 |
| Stabilizing electroluminescence color of blue perovskite LEDs via amine group doping | |
| Zhang F.; Song J.; Cai B.; Chen X.; Wei C.; Fang T.; Zeng H. | |
| 发表日期 | 2021 |
| ISSN | 20959273 |
| 英文摘要 | Voltage loading-induced change in the electroluminescence (EL) wavelength of mixed halide perovskite light-emitting diodes (PeLEDs), so-called color-shift, has become an inevitable phenomenon, which is seriously unfavorable to their applications in lighting and display. Here, we achieve color-stable blue PeLEDs via a hydrogen-bonded amine-group doping strategy. Selecting guanidine (GA) or formamidinium (FA) as amine-group (−NH2) doping source for CsPbBrxCl3−x quantum dots (QDs), experimental and theoretical results reveal that the strong N−H⋯X (X = Br/Cl) bonding can be produced between −NH2 dopants and Pb−X lattices, thereby increasing the migration barrier of halide anions. Resultantly, color-stable sky-blue devices were realized with emission peaks fixed at 490.5 (GA) and 492.5 (FA) nm without any obvious shift as the voltage increases, in sharp contrast devices without N−H⋯X producing a 15 nm red-shift from 487 to 502 nm. Not only that, maximum external quantum efficiency is improved to 3.02% and 4.14% from the initial 1.3%. This finding offers a convenient boulevard to achieve color-stable PeLEDs with high efficiency. © 2021 Science China Press |
| 关键词 | Amine-group dopingColor stabilityHydrogen bondLight-emitting diodesPerovskitesQuantum dots |
| 语种 | 英语 |
| 来源期刊 | Science Bulletin
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/207661 |
| 作者单位 | School of Materials Science and Engineering, MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics & Nanomaterials, Nanjing University of Science and Technology, Nanjing, 210094, China |
| 推荐引用方式 GB/T 7714 | Zhang F.,Song J.,Cai B.,et al. Stabilizing electroluminescence color of blue perovskite LEDs via amine group doping[J],2021. |
| APA | Zhang F..,Song J..,Cai B..,Chen X..,Wei C..,...&Zeng H..(2021).Stabilizing electroluminescence color of blue perovskite LEDs via amine group doping.Science Bulletin. |
| MLA | Zhang F.,et al."Stabilizing electroluminescence color of blue perovskite LEDs via amine group doping".Science Bulletin (2021). |
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