- Solution-processible fluorinated carbazole derivative for phosphorescent organic light-emitting diodes
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A fluorinated carbazole, 9,9′-[2,2′-bis(trifluoromethyl) biphenyl-4,4′-diyl]bis(9H-carbazole) (6FCBP) was prepared, which exhibited better solubility compared to the well-known hole-transporting material 4,4′-bis(carbazol-9-yl)biphenyl (CBP). 6FCBP was employed to fabricate OLEDs by spin coating or vacuum deposition with excellent performance. Copyright
- Ge, Ziyi,Hayakawa, Teruaki,Ando, Shinji,Ueda, Mitsuru,Akiike, Toshiyuki,Miyamoto, Hidetoshi,Kajita, Toru,Kakimoto, Masa-Aki
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Read Online
- A series of CBP-derivatives as host materials for blue phosphorescent organic light-emitting diodes
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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. The Royal Society of Chemistry.
- Schroegel, Pamela,Tomkeviciene, Ausra,Strohriegl, Peter,Hoffmann, Sebastian T.,Koehler, Anna,Lennartz, Christian
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experimental part
p. 2266 - 2273
(2011/10/12)
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- Novel compounds, their preparation and use
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A novel class of dicarboxylic acid derivatives, the use of these compounds as pharmaceutical compositions, pharmaceutical compositions comprising the compounds and methods of treatment employing these compounds and compositions. The present compounds may be useful in the treatment and/or prevention of conditions mediated by Peroxisome Proliferator-Activated Receptors (PPAR).
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- DICARBOXYLIC ACID DERIVATIVES AS PPAR-AGONISTS
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A novel class of dicarboxylic acid derivatives, the use of these compounds as phar-maceutical compositions, pharmaceutical compositions comprising the compounds and meth-ods of treatment employing these compounds and compositions. The present compounds may be useful in the treatment and/or prevention of conditions mediated by Peroxisome Prolifera-tor-Activated Receptors (PPAR).
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- Monomers containing bis(trifluoromethyl)biphenylene radicals
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A class of polyesters comprising recurring units having certain bis(trifluoromethyl)biphenylene radicals is disclosed. The polyesters exhibit favorable solubility properties in certain organic solvents so as to facilitate the production of the polyesters via polycondensation methods to film- and fiber-forming molecular weights. Monomeric compounds comprising a bis(trifluoromethyl)biphenylene radical and useful for the production of the polyesters are also disclosed.
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