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

Zhenyu Guo, Yu Zhang, Bingzhe Wang, Liding Wang, Ning Zhou, Zhiwen Qiu, Nengxu Li, Yihua Chen, Cheng Zhu, Haipeng Xie, Tinglu Song, Lei Song, Haibo Xue, Shuxia Tao, Qi Chen, Guichuan Xing, Lixin Xiao, Zhiwei Liu, Huanping Zhou (Corresponding author)

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

3 Citaten (Scopus)

Samenvatting

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 PbBr64– 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.

Originele taal-2Engels
Artikelnummer2102246
Aantal pagina's10
TijdschriftAdvanced Materials
Volume33
Nummer van het tijdschrift40
Vroegere onlinedatum15 aug 2021
DOI's
StatusGepubliceerd - 7 okt 2021

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© 2021 Wiley-VCH GmbH

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