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A series of CBP-derivatives as host materials for blue phosphorescent organic light-emitting diodes

Title data

Schrögel, Pamela ; Tomkevičienė, Aušra ; Strohriegl, Peter ; Hoffmann, Sebastian T. ; Köhler, Anna ; Lennartz, Christian:
A series of CBP-derivatives as host materials for blue phosphorescent organic light-emitting diodes.
In: Journal of Materials Chemistry. Vol. 21 (2011) . - pp. 2266-2273.
ISSN 0959-9428
DOI: https://doi.org/10.1039/C0JM03321A

Official URL: Volltext

Abstract in another language

We report a series of CBP-derivatives with superior thermal and electronic properties for the use as host materials for blue electrophosphorescent organic light emitting diodes. We applied a systematic variation of the substitution pattern in the 2- and 2′-position of the biphenyl unit and the 3- and 6-position of the carbazole moieties. In contrast to the crystalline parent compound CBP, all methyl and trifluoromethyl substituted derivatives show amorphous behaviour. Substitution in the 2- and 2′-position of the biphenyl causes a twisting of the phenyl rings. Hence, the degree of conjugation of the molecules is limited which leads to enlarged triplet energies of approximately 2.95 eV compared to 2.58 eV for CBP. The methyl substitution at the active 3- and 6-position of the pendant carbazole units yields materials with an electrochemically stable behaviour against oxidation.

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: 13 Feb 2015 12:36
Last Modified: 13 Feb 2015 12:36
URI: https://eref.uni-bayreuth.de/id/eprint/6725