Journal
CHEMICAL SCIENCE
Volume 10, Issue 31, Pages 7352-7357Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9sc02282a
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Funding
- National Natural Science Foundation of China [NSFC: 51803242, 51733010, 61605253, 21672267]
- Science and Technology Planning Project of Guangdong [2015B090913003]
- China Postdoctoral Science Foundation [2017M620395]
- Fundamental Research Funds for the Central Universities
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Due to inefficient molecular design strategies, two-photon-excited ultralong organic room temperature phosphorescence (TPUOP) has not yet been reported in single-component materials. Herein, we present an innovative design method by dual-channel triplet harvesting to obtain the first bright TPUOP molecule with a lifetime of 0.84 s and a quantum efficiency of 16.6%. In compound o-Cz the donor and acceptor units are connected at the ortho position of benzophenone, showing intramolecular space charge transfer. Therefore, the two-photon absorption ability is improved due to the enhanced charge transfer character. Moreover, the small energy gap boosts dual-channel triplet harvesting via ultralong thermally activated delayed fluorescence and H-aggregation phosphorescence, which suppresses the long-lived triplet concentration quenching. Through two-photon absorption, a near-infrared laser (808 nm) is able to trigger the obvious ultralong emission under ambient conditions. This research work provides valuable guidance for designing near-infrared-excited ultralong organic room temperature phosphorescence materials.
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