Promoting Energy Transfer via Manipulation of Crystallization Kinetics of Quasi-2D Perovskites for Efficient Green Light-Emitting Diodes

Promoting Energy Transfer via Manipulation of Crystallization Kinetics of Quasi-2D Perovskites for Efficient Green Light-Emitting Diodes

© 2021 Wiley-VCH GmbH.

Bibliographische Detailangaben
Veröffentlicht in:Advanced materials (Deerfield Beach, Fla.). - 1998. - 33(2021), 40 vom: 21. Okt., Seite e2102246
1. Verfasser: Guo, Zhenyu (VerfasserIn)
Weitere Verfasser: Zhang, Yu, Wang, Bingzhe, Wang, Liding, Zhou, Ning, Qiu, Zhiwen, Li, Nengxu, Chen, Yihua, Zhu, Cheng, Xie, Haipeng, Song, Tinglu, Song, Lei, Xue, Haibo, Tao, Shuxia, Chen, Qi, Xing, Guichuan, Xiao, Lixin, Liu, Zhiwei, Zhou, Huanping
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2021
Zugriff auf das übergeordnete Werk:Advanced materials (Deerfield Beach, Fla.)
Schlagworte:Journal Article alkali-metal cations crystallization kinetics perovskite light-emitting diodes quasi-2D perovskites
Beschreibung
Zusammenfassung:© 2021 Wiley-VCH GmbH.
Quasi-2D (Q-2D) perovskites are promising materials applied in light-emitting diodes (LEDs) due to their high exciton binding energy and quantum confinement effects. However, Q-2D perovskites feature a multiphase structure with abundant grain boundaries and interfaces, leading to nonradiative loss during the energy-transfer process. Here, a more efficient energy transfer in Q-2D perovskites is achieved by manipulating the crystallization kinetics of different-n phases. A series of alkali-metal bromides is utilized to manipulate the nucleation and growth of Q-2D perovskites, which is likely associated with the Coulomb interaction between alkali-metal ions and the negatively charged PbBr6 4- frames. The incorporation of K+ is found to restrict the nucleation of high-n phases and allows the subsequent growth of low-n phases, contributing to a spatially more homogeneous distribution of different-n phases and promoted energy transfer. As a result, highly efficient green Q-2D perovskites LEDs with a champion EQE of 18.15% and a maximum brightness of 25 800 cd m-2 are achieved. The findings affirm a novel method to optimize the performance of Q-2D perovskite LEDs
Beschreibung:Date Revised 06.10.2021
published: Print-Electronic
Citation Status PubMed-not-MEDLINE
ISSN:1521-4095
DOI:10.1002/adma.202102246