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MTXSFCz with thermally activated delayed fluorescence is synthesized. Orange and red phosphorescent organic light‐emitting diodes (PHOLEDs) with low efficiency roll‐off exhibit external quantum efficiencies (EQE) up to 11.8% and 15.6%. The efficient upconversion from triplet to singlet of the host reduces the triplet density and thus affords a low efficiency roll‐off of PHOLEDs.
A novel host material, MTXSFCz, with the thermally actived delayed fluorescent property is reported by Y. Wang, P. Wang, and co‐workers on page 4041 for the construction of red and orange phosphorescent organic light‐emitting diodes (PHOLEDs) with low efficiency roll‐off. The efficient reverse intersystem crossing of the MTXSFCz host from triplet to singlet facilitates the reduction of the triplet...
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