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Issue 17, 2011
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Theoretical design of a hole-transporting molecule: hexaaza[16]parabiphenylophane

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Abstract

We theoretically propose a hole-transporting molecule, hexaaza[16]parabiphenylophane (HAPBP), on the basis of vibronic coupling density (VCD). We calculate vibronic coupling constants (VCCs) of HAPBP and compare them with those of other well-known hole-transporting materials, N,N′-bis(3-methylphenyl)-N,N′-diphenyl[1,1′-biphenyl]-4,4′-diamine (TPD), N,N,N′,N′-tetraphenylbenzidine (TAD), and N,N′-di(1-naphthyl)-N,N′-diphenyl[1,1′-biphenyl]-4,4′-diamine (α-NPD). HAPBP has smaller VCCs than TPD, TAD, and α-NPD. Employing VCD analysis, we reveal the reason for the small VCCs of HAPBP. To investigate their single molecular hole-transporting properties, we calculate current–voltage characteristics and power loss using the non-equilibrium Green's function (NEGF) method taking into account inelastic scatterings due to the vibronic couplings. HAPBP, because of its small VCCs, exhibits more efficient hole-transporting properties and lower power loss than TPD, TAD, and α-NPD. Furthermore, as a hole-transporting material, HAPBP has more suitable highest occupied and lowest unoccupied molecular orbital energies than TPD, TAD, and α-NPD. HAPBP is a promising candidate for a hole-transporting material in organic light-emitting diodes (OLEDs).

Graphical abstract: Theoretical design of a hole-transporting molecule: hexaaza[16]parabiphenylophane

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Publication details

The article was received on 05 Nov 2010, accepted on 16 Feb 2011 and first published on 17 Mar 2011


Article type: Paper
DOI: 10.1039/C0JM03802D
Citation: J. Mater. Chem., 2011,21, 6375-6382
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    Theoretical design of a hole-transporting molecule: hexaaza[16]parabiphenylophane

    K. Shizu, T. Sato, A. Ito, K. Tanaka and H. Kaji, J. Mater. Chem., 2011, 21, 6375
    DOI: 10.1039/C0JM03802D

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