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Article Abstract
Intramolecular spatial charge transfer (ISCT) plays a critical role in determining the optical and charge transport properties of thermally activated delayed fluorescence (TADF) materials. Herein, a new donor/acceptor-type TADF compound based on rigid dibenzothiophene sulfone (DBTS) moiety, , was designed and synthesized. Fluorene unit was used as a rigid linker to position the rigid acceptor and donor subunit in close vicinity with control over their spacing and molecular structure and to achieve high photoluminescence quantum yield (∼53%) and TADF property. For comparison purposes, we constructed the more flexible with a less rotationally constrained diphenylsulphone (DPS) acceptor instead of the rigid DBTS units, and showed no TADF properties and lower PLQY (16.0%). Organic light-emitting diodes (OLEDs) based on achieve an external quantum efficiency (EQE) of 10.3% at 488 nm, which is a fivefold improvement in EQE with respect to .
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| http://dx.doi.org/10.1021/acs.joc.0c01200 | DOI Listing |
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