Abstract
We report a new emitter 3,4,5-3TCz-TTT based on a tris(triazolo)triazine acceptor that shows thermally activated delayed fluorescence and cross-compare its performance with the recently reported analogue, 3DMAC-TTT.
Highlights
Organic light-emitting diodes (OLEDs) generate light by the recombination of electrically generated holes and electrons to form excitons that subsequently radiatively decay
The classic design strategies are based on the combination of donor and acceptor groups and their small electronic coupling either via (1) a twisted intramolecular charge transfer[6,7,8,9,10,11] transition, (2) a through-space charge-transfer transition,[7,8,12] (3) a spiroconjugation charge transfer transition[13,14] or (4) an alternating highest occupied molecular orbital (HOMO)/lowest unoccupied molecular orbital (LUMO) distribution in p,n-doped polycyclic aromatic hydrocarbons, termed a multi-resonance Thermally activated delayed fluorescence (TADF) transition.[2,15,16,17,18]
Solubilizing groups are decorated around a known emitter core to improve the film morphology of the emissive layer in solution-processed OLEDs. An example of this can be found in the work of Cho et al where they investigated the effect that solution-processing and vacuum deposition have on the performance of OLEDs, employing three related TADF emitters: 4CzIPN, m4CzIPN and t4CzIPN (Fig. 1).[33]
Summary
Organic light-emitting diodes (OLEDs) generate light by the recombination of electrically generated holes and electrons to form excitons that subsequently radiatively decay. Solubilizing groups are decorated around a known emitter core to improve the film morphology of the emissive layer in solution-processed OLEDs. An example of this can be found in the work of Cho et al where they investigated the effect that solution-processing and vacuum deposition have on the performance of OLEDs, employing three related TADF emitters: 4CzIPN, m4CzIPN and t4CzIPN (Fig. 1).[33] The solution-processed device of 4CzIPN shows a substantial drop in performance compared to the vacuum-deposited OLED (maximum external quantum efficiency, EQEmax, decreasing 26.0% to 8.1%). TTT-Ph-BAc shows a delayed lifetime of 50.7 ms, but the FPL is significantly lower at 32%, which translated to a lower EQEmax for the OLED using this emitter than in the device using TTT-Ph-Ac. Here, we introduce a new TTT-based emitter (Fig. 3), 3,4,53TCz-TTT, and cross-compare its performance with the recently reported compound 3DMAC-TTT (aka TTT-DMAC/TTT-Ph-Ac).
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