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The influence of torsion on excimer formation in bipolar host materials for blue phosphorescent OLEDs

Title data

Rudnick, Alexander ; Bagnich, Sergey A. ; Wagner, Daniel ; Athanasopoulos, Stavros ; Strohriegl, Peter ; Köhler, Anna:
The influence of torsion on excimer formation in bipolar host materials for blue phosphorescent OLEDs.
In: The Journal of Chemical Physics. Vol. 144 (2016) .
ISSN 0021-9606
DOI: https://doi.org/10.1063/1.4953102

Abstract in another language

We present a combined detailed spectroscopic and quantum chemical study on the bipolar host materials BPTRZ and MBPTRZ in solution and in neat film. In the two compounds, the hole transporting carbazole is separated from the electron transporting triazine moiety by a fully aromatic but non-conjugated meta-linked biphenyl unit. The two materials differ by an additional steric twist at the biphenyl in MBPTRZ, which is achieved by methyl-substitution in 2- and 2′-position of the biphenyl. We find that while the twist shifts the triplet state in MBPTRZ to higher energies (3.0 eV in solution) compared to BPTRZ (2.8 eV in solution), this also localizes electron density on the carbazole moiety, leading to excimer formation in neat films.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Lehrstuhl Experimentalphysik II - Optoelektronik weicher Materie > Lehrstuhl Experimentalphysik II - Optoelektronik weicher Materie - Univ.-Prof. Dr. Anna Köhler
Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Lehrstuhl Experimentalphysik II - Optoelektronik weicher Materie
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 17 Jun 2016 09:54
Last Modified: 17 Jun 2016 09:54
URI: https://eref.uni-bayreuth.de/id/eprint/32819