磷光
联苯
咔唑
有机发光二极管
三氟甲基
光化学
化学
无定形固体
材料科学
萘
蓝光
结晶学
有机化学
烷基
光电子学
物理
光学
荧光
图层(电子)
作者
Pamela Schrögel,Aušra Tomkevičienė,Peter Strohriegl,Sebastian T. Hoffmann,Anna Köhler,Christian Lennartz
摘要
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.
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