期刊
NATURE COMMUNICATIONS
卷 10, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-019-09561-8
关键词
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资金
- National Science Foundation of China [21788102, 51703042]
- University Grants Committee of Hong Kong [AoE/P-03/08]
- Science and Technology Plan of Shenzhen [JCYJ20160229205601482, JCYJ20170811155015918]
- Research Grants Council of Hong Kong [16308016, 16305015, C6009-17G, A-HKUST605/16]
- Innovation and Technology Commission [ITC-CNERC14SC01, ITS/254/17]
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.
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