Molecular design and synthesis of dicarbazolophane-based centro-symmetric through-space donors for solution-processed thermally activated delayed fluorescence OLEDs
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Conjugation-extended carbazolophane donors, dicarbazolophanes ( DCzp ), were designed and synthesized using a multifold stepwise Pd-catalyzed Buchwald–Hartwig amination/ring cyclization process. Furthermore, elaboration of the DCzp core is possible with the introduction of pendant carbazole derivative groups. This provides a way to tune the optoelectronic properties of the thermally activated delayed fluorescence (TADF) compounds DCzpTRZtBu , dtBuCzDCzpTRZtBu , and dMeOCzDCzpTRZtBu . Solution-processed organic light-emitting diodes (OLEDs) were fabricated and achieved a maximum external quantum efficiency (EQEmax) of 8.2% and an EQE of 7.9% at 100 cd/m2.
Zhang , Z , Diesing , S , Crovini , E , Gupta , A K , Spuling , E , Gua , X , Fuhr , O , Nieger , M , Hassan , Z , Samuel , I D W , Bräse , S & Zysman-Colman , E 2021 , ' Molecular design and synthesis of dicarbazolophane-based centro-symmetric through-space donors for solution-processed thermally activated delayed fluorescence OLEDs ' , Organic Letters , vol. Articles ASAP . https://doi.org/10.1021/acs.orglett.1c02273
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DescriptionThe German Research Foundation (formally Deutsche Forschungsgemeinschaft DFG) in the framework of SFB1176 Co-operative Research Centre “Molecular Structuring of Soft Matter” (CRC1176, A4, B3, C2, C6) and the cluster “3D Matter Made to Order” funded under Germany’s Excellence Strategy 2082/1–390761711 are acknowledged for financial contributions. A. K. G. is thankful to the Royal Society for a Newton International Fellowship NF171163. E. Z.-C. and I. D. W. S. acknowledge support from EPSRC (EP/L017008, EP/P010482/1, EP/R035164/1). E. C. and E. Z.-C. acknowledge the EU Horizon 2020 grant agreement no. 812872 (TADFlife).
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