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Small organic molecules : building blocks of functional materials

Gantenbein, Markus. Small organic molecules : building blocks of functional materials. 2015, PhD Thesis, University of Basel, Faculty of Science.

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Official URL: http://edoc.unibas.ch/diss/DissB_11455

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Abstract

The potential of phosphorescent organic light emitting diodes (phOLEDs) in full-color flat-panel display solid state lighting devices is fueling the interest in high triplet energy materials. 4,4′-Bis(9-carbazolyl)–biphenyl is one of the most widely used host material in phOLEDs. Because of its triplet energy of 2.56 eV, it is a suitable hole transporting material for green phosphorescent emitters, such as tris(2-phenylpyridine)iridium(III). However, the commonly used dye bis[(4,6-difluorophenyl)-pyridinato-N,C2]-picolinateiridium(III) in blue phOLEDs exhibits a triplet energy of 2.65 eV. Therefore, new high-triplet energy host materials are required to allow for efficient OLED-devices.
The design of blue pixel host materials is based on the idea of reducing the level of conjugation between the carbazole subunit and the biphenyl backbone. Therefore, a series of CBP derivatives was synthesized and studied with spatially restricted degrees of freedom in their biphenyl-N-carbazole junctions by introducing spatial demanding methyl moieties either in positions 1 and 8 of the carbazole unit or in positions 3,5,3’,5’ of the biphenyl backbone. Moreover, the electronic features of the carbazole synthons were investigated by attaching electron-withdrawing or electron-donating groups in the positions 3 and 6 or positions 2 and 7 of the carbazole subunits.
Advisors:Mayor, Marcel
Committee Members:Constable, Edwin C.
Faculties and Departments:05 Faculty of Science > Departement Chemie > Chemie > Molecular Devices and Materials (Mayor)
Item Type:Thesis
Thesis no:11455
Bibsysno:Link to catalogue
ISBN:978-3-8439-2167-1
Number of Pages:163 S.
Language:English
Identification Number:
Last Modified:30 Jun 2016 10:58
Deposited On:02 Nov 2015 13:48

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