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Establishment of structure-property relationships of thermally activated delayed fluorescence (TADF) materials has become an important topic for the scientific community. In this work, two new donors, 10H-benzofuro[3,2-b]indole (BFI) and 10H-benzo[4,5]thieno[3,2-b]indole (BTI), were developed and integrated with aryltriazine acceptor for designing green TADF emitters named benzofuro[3,2-b]indol-10-yl)-5-(4,6-diphenyl-1,3,5-triazin-2-yl)benzonitrile (BFICNTrz) and 2-(10H-benzo[4,5]thieno[3,2-b]indol-10-yl)-5-(4,6-diphenyl-1,3,5-triazin-2-yl)benzonitrile (BTICNTrz), respectively. The physicochemical and electroluminescence properties of the compounds were tuned by replacement of heteroatom in donor scaffold. Intriguingly, the electronegativity of heteroatom and ionization potential of donor units played a vital role in controlling the singlet-triplet energy splitting and TADF mechanism of the compounds. Both compounds showed similar singlet excited states originating from the charge transfer (CT) states (1CT), while they showed triplet excited state tuned by the heteroatom in the donor unit. The origin of phosphorescence in the BTICNTrz emitter was CT emission from triplet state (3CT), whereas that in the BFICNTrz emitter stemmed from the local triplet excited state (3LE). Consequently, BTICNTrz possessed small singlet-triplet energy splitting of 0.16 eV when compared to 0.31 eV of BFICNTrz. Thus, BTICNTrz showed efficient delayed fluorescence with high quantum yield and short delayed exciton lifetime, whereas BFICNTrz displayed weak delayed fluorescence with lifetime in millisecond time scale range. Furthermore, the BTICNTrz based device exhibited maximum EQE of 15.2% and reduced efficiency roll-off (12%) compared to its counterpart BFICNTrz, which showed maximum EQE of 6.4% and severe efficiency roll-off (55%) at practical brightness range of 1000 cd/m2. These results demonstrate that the choice of subunits plays a vital role in designing of efficient TADF emitters.
This article was published in the following journal.
Name: Chemistry, an Asian journal
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