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Issue 41, 2005
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Hexaphenylphenylene dendronised pyrenylamines for efficient organic light-emitting diodes

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Abstract

A series of blue-emitting triarylamines containing pyrene and hexaphenylbenzene dendrons were successfully synthesized by employing the Diels–Alder and palladium catalyzed C–N coupling reactions. They display high glass transition temperatures (>140 °C) in differential scanning calorimetry and facile reversible oxidation couple in cyclic voltammetry. They are also thermally stable exhibiting decomposition temperature above 385 °C. Efficient blue-emitting electroluminescent devices were fabricated using these novel amines as the hole transporting layer and 1,3,5-tris(N-phenylbenzimidazol-2-yl)benzene (TPBI) as the electron transporting layer. Colour mixing or green emission was observed when tris(8-hydroxyquinoline)aluminium (Alq3) was used as the electron transporting layer. However insertion of a thin layer of TPBI or 1,3,5-tris(4-tert-butylphenyl-1,3,4-oxadiazolyl)benzene (TPOB) in between the HTL and Alq3 layers led to pure blue emission owing to the confinement of recombination inside the HTL layer containing the compounds.

Graphical abstract: Hexaphenylphenylene dendronised pyrenylamines for efficient organic light-emitting diodes

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Publication details

The article was received on 01 Jul 2005, accepted on 15 Aug 2005 and first published on 07 Sep 2005


Article type: Paper
DOI: 10.1039/B509325B
Citation: J. Mater. Chem., 2005,15, 4453-4459
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    Hexaphenylphenylene dendronised pyrenylamines for efficient organic light-emitting diodes

    K. R. J. Thomas, M. Velusamy, J. T. Lin, C. H. Chuen and Y. Tao, J. Mater. Chem., 2005, 15, 4453
    DOI: 10.1039/B509325B

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