Boosting the efficiency of organic persistent room-temperature phosphorescence by intramolecular triplet-triplet energy transfer

Weijun Zhao, Tsz Shing Cheung, Nan Jiang, Wenbin Huang, Jacky W. Y. Lam, Xuepeng Zhang, Zikai He () and Ben Zhong Tang ()
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Weijun Zhao: Institute of Molecular Functional Materials and The Hong Kong University of Science and Technology and the Institute for Advanced Study
Tsz Shing Cheung: Institute of Molecular Functional Materials and The Hong Kong University of Science and Technology and the Institute for Advanced Study
Nan Jiang: HIT Campus of University Town
Wenbin Huang: HIT Campus of University Town
Jacky W. Y. Lam: Institute of Molecular Functional Materials and The Hong Kong University of Science and Technology and the Institute for Advanced Study
Xuepeng Zhang: Institute of Molecular Functional Materials and The Hong Kong University of Science and Technology and the Institute for Advanced Study
Zikai He: HIT Campus of University Town
Ben Zhong Tang: Institute of Molecular Functional Materials and The Hong Kong University of Science and Technology and the Institute for Advanced Study

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: Abstract Persistent luminescence is a fascinating phenomenon with exceptional applications. However, the development of organic materials capable of persistent luminescence, such as organic persistent room-temperature phosphorescence, lags behind for their normally low efficiency. Moreover, enhancing the phosphorescence efficiency of organic luminophores often results in short lifetime, which sets an irreconcilable obstacle. Here we report a strategy to boost the efficiency of phosphorescence by intramolecular triplet-triplet energy transfer. Incorpotation of (bromo)dibenzofuran or (bromo)dibenzothiophene to carbazole has boosted the intersystem crossing and provided an intramolecular triplet-state bridge to offer a near quantitative exothermic triplet–triplet energy transfer to repopulate the lowest triplet-state of carbazole. All these factors work together to contribute the efficient phosphorescence. The generation and transfer of triplet excitons within a single molecule is revealed by low-temperature spectra, energy level and lifetime investigations. The strategy developed here will enable the development of efficient phosphorescent materials for potential high-tech applications.

Date: 2019
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DOI: 10.1038/s41467-019-09561-8

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