期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 60, 期 33, 页码 18059-18064出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202103192
关键词
crystal engineering; J- and H- aggregates; polymorphs; room-temperature phosphorescence; thermally activated delayed fluorescence
资金
- National Natural Science Foundation of China [22090022, 21873065, 21833005, 21790364]
- Beijing Natural Science Foundation of China [2162011, 2192011]
- Open Fund of the State Key Laboratory of Integrated Optoelectronics [IOSKL2019KF01]
- Capacity Building for Sci-Tech Innovation-Fundamental Scientific Research Funds [025185305000/210, 009/19530050162]
- Youth Innovative Research Team of Capital Normal University [009/19530050148]
- Beijing Advanced Innovation Center for Imaging Technology [009/19530011009]
- Ministry of Science and Technology of China [2013CB933500, 2017YFA0204503]
By controlling the excited-state dynamics, the TADF and RTP emissions of a boron difluoride beta-acetylnaphthalene chelate (beta CBF2) have been successfully regulated, resulting in two crystalline polymorphs emitting green and red light, respectively.
Control of excited-state dynamics is key in tuning room-temperature phosphorescence (RTP) and thermally activated delayed fluorescence (TADF) emissions but is challenging for organic luminescent materials (OLMs). We show the regulation of TADF and RTP emissions of a boron difluoride beta-acetylnaphthalene chelate (beta CBF2) by controlling the excited-state dynamics via its J- and H-aggregation states. Two crystalline polymorphs emitting green and red light have been controllably obtained. Although both monoclinic, the green and red crystals are dominated by J- and H-aggregation, respectively, owing to different molecular packing arrangements. J-aggregation significantly reduces the energy gap between the lowest singlet and triplet excited states for ultra-fast reverse intersystem crossing (RISC) and enhances the radiative singlet decay, together leading to TADF. The H-aggregation accelerates the ISC and suppresses the radiative singlet decay, helping to stabilize the triplet exciton for RTP.
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