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OBO-Fused Benzo[fg]tetracene as Acceptor With Potential for Thermally Activated Delayed Fluorescence Emitters

Title data

Zhang, Zhen ; Kumar, Shiv ; Bagnich, Sergey ; Spuling, Eduard ; Hundemer, Fabian ; Nieger, Martin ; Hassan, Zahid ; Köhler, Anna ; Zysman-Colman, Eli ; Bräse, Stefan:
OBO-Fused Benzo[fg]tetracene as Acceptor With Potential for Thermally Activated Delayed Fluorescence Emitters.
In: Frontiers in Chemistry. (2020) .
ISSN 2296-2646
DOI: https://doi.org/10.3389/fchem.2020.563411

Abstract in another language

SixluminophoresbearinganOBO-fusedbenzo[fg]tetracenecoreasanelectronacceptor were designed and synthesized. The molecular structures of three molecules (PXZ-OBO, 5PXZ-OBO, 5DMAC-OBO) were determined by single crystal X-ray diffraction studies and revealed significant torsion between the donor moieties and the OBO acceptor with dihedral angles between 75.5 and 86.2◦. Photophysical studies demonstrate that blue and deep blue emission can be realized with photoluminescence maxima (λPL) ranging from 415 to 480nm in mCP films. The emission energy is modulated by simply varying the strength of the donor heterocycle, the number of donors, and their position relative to the acceptor. Although the DMAC derivatives show negligible delayed emission because of their large singlet-triplet excited state energy difference, 1EST, PXZ-based molecules, especially PXZ-OBO with an experimental 1EST of 0.25eV, demonstrate delayed emission in blend mCP films at room temperature, which suggests triplet exciton harvesting occurs in these samples, potentially by thermally activated delayed fluorescence.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: boron emitters; fluorescence; OLED; TADF; boron
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Experimental Physics II - Optoelectronics of Soft Matter
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Experimental Physics II - Optoelectronics of Soft Matter > Chair Experimental Physics II - Optoelectronics of Soft Matter - Univ.-Prof. Dr. Anna Köhler
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 06 Oct 2020 05:49
Last Modified: 06 Oct 2020 05:49
URI: https://eref.uni-bayreuth.de/id/eprint/57865