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Harvesting non-emissive spin-triplet charge-transfer (CT) excitons of organic semiconductors is fundamentally important for increasing the operation efficiency of future devices. We observed thermally activated delayed fluorescence (TADF) in a 1:2 charge transfer cocrystal of trans-1,2-Diphenylethylene (TSB) and 1,2,4,5-Tetracyanobenzene (TCNB). This cocrystal system was characterized by absorption spectroscopy, variable-temperature steady-state and time-resolved photoluminescence spectroscopy, single crystal X-ray diffraction as well as first-principles calculations. Those data reveal that intermolecular CT in cocrystal narrows the single-triplet energy gap and therefore facilitates the reverse intersystem crossing (RISC) for TADF. These finding open up a new way for future design and development of novel TADF materials.
This article was published in the following journal.
Name: Angewandte Chemie (International ed. in English)
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