期刊
ADVANCED FUNCTIONAL MATERIALS
卷 30, 期 10, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201908760
关键词
charge injection; defects passivation; perovskite light-emitting diodes; spectrally stable; surface ligands
类别
资金
- NSFC/China [51727809]
- Wuhan Science and Technology Bureau [2019010701011406]
- China Postdoctoral Science Foundation [2017M620321]
Metal halide perovskites have aroused tremendous interest in the past several years for their promising applications in display and lighting. However, the development of blue perovskite light-emitting diodes (PeLEDs) still lags far behind that of their green and red cousins due to the difficulty in obtaining high-quality blue perovskite emissive layers. In this study, a simple approach is conceived to improve the emission and electrical properties of blue perovskites. By introducing an alkali metal ion to occupy some sites of peripheral suspended organic ligands, the nonradiative recombination is suppressed, and, consequently, blue CsPb(Br/Cl)(3) nanocrystals with a high photoluminescence quantum efficiency of 38.4% are obtained. The introduced K+ acts as a new type of metal ligand, which not only suppresses nonradiative pathways but also improves the charge carrier transport of the perovskite nanocrystals. With further engineering of the device structure to balance the charge injection rate, a spectrally stable and efficient blue PeLED with a maximum external quantum efficiency of 1.96% at the emission peak of 477 nm is fabricated.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据