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Issue 1, 2015
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Synthesis and optical properties of phenanthromidazole derivatives for organic electroluminescent devices

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Abstract

Five phenanthromidazole derivatives, namely 2-(naphthalen-1-yl)-1H-phenanthro[9,10-d]imidazole (1), 2-(naphthalen-1-yl)-1-phenyl-1H-phenanthro[9,10-d]imidazole (2), 2-(naphthalen-1-yl)-1-p-tolyl-1H-phenanthro[9,10-d]imidazole (3), 1-(4-methoxyphenyl)-2-(naphthalen-1-yl)-1H-phenanthro[9,10-d]imidazole (4) and 1-(3,5-dimethylphenyl)-2-(naphthalen-1-yl)-1H-phenanthro[9,10-d]imidazole (5), were synthesised using the TiO2 (R) nanosemiconductor as the catalyst under solvent free conditions and characterised by NMR and single crystal XRD techniques. Their photophysical, electrochemical and electroluminescent properties were carefully analysed. Highly efficient Alq3-based organic light emitting devices have been developed using phenanthromidazoles as functional layers between NPB [4,4-bis(N-(1-naphthyl)-N-phenylamino)biphenyl] and Alq3 [tris(8-hydroxyquinoline)aluminium] layers. Using the device of ITO/NPB/4/Alq3/LiF/Al, a maximum luminous efficiency of 5.99 cd A−1 was obtained with a maximum brightness of 40 623 cd m−2 and a power efficiency of 5.25 lm W−1.

Graphical abstract: Synthesis and optical properties of phenanthromidazole derivatives for organic electroluminescent devices

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Publication details

The article was received on 08 Sep 2014, accepted on 09 Oct 2014 and first published on 16 Oct 2014


Article type: Paper
DOI: 10.1039/C4NJ01515K
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New J. Chem., 2015,39, 142-154

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    Synthesis and optical properties of phenanthromidazole derivatives for organic electroluminescent devices

    J. Jayabharathi, P. Ramanathan and V. Thanikachalam, New J. Chem., 2015, 39, 142
    DOI: 10.1039/C4NJ01515K

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