Abstract
Exciton dynamics is one of the core issues lies in the field of achieving high efficiency organic light‐emitting diodes (OLEDs) based on thermally activated delayed fluorescence (TADF) molecules. The authors briefly review the host dependence of TADF dopant, and then discuess the host—guest interaction in TADF OLEDs. By the means of transient electroluminescence measurement, the dynamics of triplet and singlet excitons are studied. Results show that host material with high T1 energy levels, large spectral overlap with TADF dopant's absorption and free of exciplex formation exhibits higher TADF character. Furthermore, the underlying reason for the efficiency roll‐off of the TADF OLEDs is clarified to be attributed to deeply trapped charges.
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