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Title: Harvesting triplet excitons in lead-halide perovskites for room-temperature phosphorescence
Authors: Hu, Hongwei
Zhao, Daming
Gao, Yang
Qiao, Xianfeng
Salim, Teddy
Chen, Bingbing
Chia, Elbert Ee Min
Grimsdale, Andrew C.
Lam, Yeng Ming
Keywords: Engineering::Materials
Issue Date: 2019
Source: Hu, H., Zhao, D., Gao, Y., Qiao, X., Salim, T., Chen, B., Chia, E. E. M., Grimsdale, A. C. & Lam, Y. M. (2019). Harvesting triplet excitons in lead-halide perovskites for room-temperature phosphorescence. Chemistry of Materials, 31(7), 2597-2602.
Project: MOE2015-T2-2-065
Journal: Chemistry of Materials
Abstract: Room-temperature phosphorescence (RTP) has a much longer lifetime than fluorescence as it involves triplet excitons. This extended lifetime enables the design of advanced optoelectronics and biological sensing technologies. Despite the omnipresence of triplet states, harnessing these triplet excitons remains challenging for most organic materials because of forbidden transitions between singlet and triplet states. Here, we report novel organic–inorganic hybrid perovskites based on conjugated organic cations with low-lying triplet energy levels to extract triplet excitons from the inorganic component, thereby generating RTP with a long lifetime in the millisecond range. Dexter-type energy transfer was confirmed to occur in this type of hybrid perovskites with transfer efficiency of up to 80%. More impressively, multiple-colored phosphorescence was achieved by a facile design of the system using organic cations with different triplet exciton energies. These results are expected to greatly expand the prospects of hybrid perovskites with functional organic cations for versatile display applications.
ISSN: 0897-4756
DOI: 10.1021/acs.chemmater.9b00315
Rights: © 2019 American Chemical Society. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:MSE Journal Articles

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