期刊
NATURE COMMUNICATIONS
卷 10, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-019-13048-x
关键词
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资金
- National Science Foundation of China [51622305, 21788102, 51873092]
- Research Grants Council of Hong Kong [16308116, C6009-17G, A-HKUST605/16]
- Innovation and Technology Commission [ITC-CNERC14SC01, ITCPD/17-9]
- open fund of State Key Laboratory of Luminescent Materials and Devices in South China University of Technology [2018skllmd-05]
- National Key R&D Program of China [2017YFA0303500]
- Fundamental Research Funds for the Central Universities [WK2340000068]
- Hong Kong Research Grants Council [GRF 17302218]
- University of Hong Kong Development Fund 2013-2014 project New Ultrafast Spectroscopy Experiments for Shared Facilities
Purely organic room temperature phosphorescence (RTP) has attracted wide attention recently due to its various application potentials. However, ultralong RTP (URTP) with high efficiency is still rarely achieved. Herein, by dissolving 1,8-naphthalic anhydride in certain organic solid hosts, URTP with a lifetime of over 600 ms and overall quantum yield of over 20% is realized. Meanwhile, the URTP can also be achieved by mechanical excitation when the host is mechanoluminescent. Femtosecond transient absorption studies reveal that intersystem crossing of the host is accelerated substantially in the presence of a trace amount of 1,8-naphthalic anhydride. Accordingly, we propose that a cluster exciton spanning the host and guest forms as a transient state before the guest acts as an energy trap for the RTP state. The cluster exciton model proposed here is expected to help expand the varieties of purely organic URTP materials based on an advanced understanding of guest/host combinations.
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