2018
DOI: 10.1039/c7tc04852a
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A new rigid diindolocarbazole donor moiety for high quantum efficiency thermally activated delayed fluorescence emitter

Abstract: We report a new electron donor moiety (diindolocarbazole) for high performances of thermally activated delayed fluorescence emitters.

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Cited by 64 publications
(46 citation statements)
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“…[ 27,28 ] In our previous work, we designed and synthesized an efficient TADF emitter using 2,12‐di‐tert‐butyl‐5,9‐dioxa‐13b‐boranaphtho[3,2,1‐de]anthracene (TDBA) acceptor that has rigid and ring structure and diindolocarbazole (DI) donor that can make a large twist angle with the acceptor. [ 4,29 ] However, that molecule contains two tert‐butyl groups, which is very unstable and it could easily dissociate in a blue TADF device. Therefore, to design electrochemically stable blue TADF emitter, we used DBA moiety without a linked tert‐butyl group as an acceptor.…”
Section: Resultsmentioning
confidence: 99%
“…[ 27,28 ] In our previous work, we designed and synthesized an efficient TADF emitter using 2,12‐di‐tert‐butyl‐5,9‐dioxa‐13b‐boranaphtho[3,2,1‐de]anthracene (TDBA) acceptor that has rigid and ring structure and diindolocarbazole (DI) donor that can make a large twist angle with the acceptor. [ 4,29 ] However, that molecule contains two tert‐butyl groups, which is very unstable and it could easily dissociate in a blue TADF device. Therefore, to design electrochemically stable blue TADF emitter, we used DBA moiety without a linked tert‐butyl group as an acceptor.…”
Section: Resultsmentioning
confidence: 99%
“…15 OLEDs fabricated with TADF emitters have shown impressive performances, sometimes with external efficiencies (EQE) above 30%. [16][17][18] However, the performance of TADF-based OLEDs is often weaker in the red and blue regions, 19 and is in general affected by poor stability showing significant device efficiency roll-off at high current densities. The causes of poor stability are not always clear, but triplet-triplet annihilation and tripletpolaron processes are often responsible for the luminescence quenching.…”
Section: Introductionmentioning
confidence: 99%
“…Gaussian 16 softwareb ased on the B3LYP 6-31G* basis set was used fort he calculations on these TADF molecules. [36][37][38][39] The donor moiety was seen to have little effect on the HOMO andL UMO distributions. In each of the materials, the HOMO was seen to be dispersed over the benzofurocarbazole electron-donatingg roup, with the LUMO predominantly dispersed over the diphenyltriazine electron-acceptor moiety.T he n-p*e lectron interaction between the triazine moiety andt he non-bonding electron of nitrogen in benzofurocarbazole is also similar in all three TADF phenyll inkers.…”
Section: Resultsmentioning
confidence: 99%