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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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Publication details

The article was received on 02 Oct 2010, accepted on 15 Nov 2010 and first published on 14 Dec 2010


Article type: Paper
DOI: 10.1039/C0JM03321A
Citation: J. Mater. Chem., 2011,21, 2266-2273
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    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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