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Excimer Formation by Steric Twisting in Carbazole and Triphenylamine-Based Host Materials

Title data

Bagnich, Sergey A. ; Athanasopoulos, Stavros ; Rudnick, Alexander ; Schrögel, Pamela ; Bauer, Irene ; Greenham, Neil C. ; Strohriegl, Peter ; Köhler, Anna:
Excimer Formation by Steric Twisting in Carbazole and Triphenylamine-Based Host Materials.
In: The Journal of Physical Chemistry C. Vol. 119 (2015) Issue 5 . - pp. 2380-2387.
ISSN 1932-7455
DOI: https://doi.org/10.1021/jp512772j

Official URL: Volltext

Abstract in another language

This paper presents a detailed spectroscopic investigation of luminescence properties of 4,4′-bis(N-carbazolyl)-1,1′-biphenyl (CBP) and N,N,N′,N′-tetraphenylbenzidine (TAD) in solutions and neat films. These compounds are compared to their derivatives CDBP and TDAD that contain methyl groups in the 2 and 2′ position of the biphenyl core. We find that whereas steric twisting in CDBP and TDAD leads to a high triplet energy of about 3.0 and 3.1 eV, respectively, these compounds also tend to form triplet excimers in a neat film, in contrast to CBP and TAD. By comparison with N-phenylcarbazole (NPC) and triphenylamine (TPA), on which these compounds are based, as well as with the rigid spiro analogues to CBP and TAD we show that the reduced excimer formation in CBP and TAD can be attributed to a localization of the excitation onto the central biphenyl part of the molecule.

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: 12 Feb 2015 09:07
Last Modified: 12 Feb 2015 09:07
URI: https://eref.uni-bayreuth.de/id/eprint/6717