Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 60, Issue 31, Pages 16970-16973Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202106204
Keywords
binary doping system; donor-acceptor systems; host-guest systems; parts per billion; room-temperature phosphorescence
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Funding
- National Natural Science Foundation [21975238, 22003063]
- National Key R&D Program of China [2017YFA0303500]
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The study achieved the efficient production of long-lived red organic room-temperature phosphorescence at extremely low concentrations by using naphthalimide fluorescent dyes in phthalimide hosts. This finding holds potential applications in molecular solids.
Manipulation of long-lived triplet excitons in organic molecules is key to applications including next-generation optoelectronics, background-free bioimaging, information encryption, and photodynamic therapy. However, for organic room-temperature phosphorescence (RTP), which stems from triplet excitons, it is still difficult to simultaneously achieve efficiency and lifetime enhancement on account of weak spin-orbit coupling and rapid nonradiative transitions, especially in the red and near-infrared region. Herein, we report that a series of fluorescent naphthalimides-which did not originally show observable phosphorescence in solution, as aggregates, in polymer films, or in any other tested host material, including heavy-atom matrices at cryogenic temperatures-can now efficiently produce ultralong RTP (phi = 0.17, tau = 243 ms) in phthalimide hosts. Notably, red RTP (lambda(RTP) = 628 nm) is realized at a molar ratio of less than 10 parts per billion, demonstrating an unprecedentedly low guest-to-host ratio where efficient RTP can take place in molecular solids.
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