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High Triplet Energy Host Materials for Blue TADF OLEDs - A Tool Box Approach

Title data

Rodella, Francesco ; Bagnich, Sergey ; Duda, Eimantas ; Meier, Tobias ; Kahle, Frank-Julian ; Athanasopoulos, Stavros ; Köhler, Anna ; Strohriegl, Peter:
High Triplet Energy Host Materials for Blue TADF OLEDs - A Tool Box Approach.
In: Frontiers in Chemistry. (July 2020) .
ISSN 2296-2646
DOI: https://doi.org/10.3389/fchem.2020.00657

Abstract in another language

The synthesis of stable blue TADF emitters and the corresponding matrix materials is one of the biggest challenges in the development of novel OLED materials. We present six bipolar host materials based on triazine as an acceptor and two types of donors, namely, carbazole, and acridine. Using a tool box approach, the chemical structure of the materials is changed in a systematic way. Both the carbazole and acridine donor are connected to the triazine acceptor via a para- or a meta-linked phenyl ring or are linked directly to each other. Thephotophysicsofthematerialshasbeeninvestigatedindetailby absorption-, fluorescence-, and phosphorescence spectroscopy in solution. In addition, a number of DFT calculations have been made which result in a deeper understanding of the photophysics. The presence of a phenyl bridge between donor and acceptor cores leads to a considerable decrease of the triplet energy due to extension of the overlap electron and hole orbitals over the triazine-phenyl core of the molecule. This decrease is more pronounced for the para-phenylene than for the meta-phenylene linker. Only direct connection of the donor group to the triazine core provides a high energy of the triplet state of 2.97eV for the carbazole derivative CTRZ and 3.07eV for the acridine ATRZ. This is a major requirement for the use of the materials as a host for blue TADF emitters.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Thermally activated delayed fluorescence; TADF; Host; Organic light emitting diode; Tool box approach; High triplet energy
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: 30 Jul 2020 06:50
Last Modified: 30 Jul 2020 06:50
URI: https://eref.uni-bayreuth.de/id/eprint/56186