Overcoming energy loss of thermally activated delayed fluorescence sensitized-OLEDs by developing a fluorescent dopant with a small singlet–triplet energy splitting

Abstract

An approach was presented to suppress T 1 -state energy loss in OLEDs. That is developing comparable T 1 -energy FD with TADF co-host, and thus, T 1 excitons on the FDs would escape and go back to the co-host and then transfer to the singlet state of the FDs, finally contributing to light-emission.