6H-Benzo[4,5]thieno[2,3-b]indole as a novel donor for efficient thermally activated delayed fluorescence emitters with EQEs over 20%

In this report, we developed two novel indole-based electron donors, 6H-benzo[4,5]thieno[2,3-b]indole (synBTI) and 6H-benzofuro[2,3-b]indole (synBFI), for designing green thermally activated delayed fluorescence (TADF) emitters.