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Issue 7, 2011
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A series of CBP-derivatives as host materials for blue phosphorescent organic light-emitting diodes

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Abstract

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.

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

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Article information


Submitted
02 Oct 2010
Accepted
15 Nov 2010
First published
14 Dec 2010

J. Mater. Chem., 2011,21, 2266-2273
Article type
Paper

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

P. Schrögel, A. Tomkevičienė, P. Strohriegl, S. T. Hoffmann, A. Köhler and C. Lennartz, J. Mater. Chem., 2011, 21, 2266
DOI: 10.1039/C0JM03321A

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