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Issue 38, 2012
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Low driving voltage characteristics of triphenylene derivatives as electron transport materials in organic light-emitting diodes

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Abstract

Triphenylene-based electron transport materials (ETMs), designated Bpy-TP1-4, with a coplanar molecular structure and a large electron affinity were designed and synthesized for use in organic light-emitting diodes (OLEDs). Spectroscopic ellipsometry measurements clarified that the deposited thin films of these ETMs have optical anisotropy, indicating that the molecules in the deposited thin films tend to be mostly oriented parallel to the substrate. Green OLEDs containing these ETMs allowed a lower driving voltage than that for OLEDs containing tris(8-hydroxyquinolinato)aluminum (Alq3) with a random orientation. In particular, the OLED containing Bpy-TP2 showed a significantly lower driving voltage, achieving lower power consumption when compared with conventional ETMs such as Alq3 and 1,3,5-tris(2-phenyl-1H-benzo[d]imidazol-1-yl)benzene (TPBi). Also, the operational lifetime of a blue OLED containing Bpy-TP2 is equivalent to that of an OLED with TPBi. The increased driving voltage of the device containing Bpy-TP2 is significantly suppressed compared to that of the OLED containing TPBi.

Graphical abstract: Low driving voltage characteristics of triphenylene derivatives as electron transport materials in organic light-emitting diodes

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Publication details

The article was received on 07 Jun 2012, accepted on 19 Aug 2012 and first published on 31 Aug 2012


Article type: Paper
DOI: 10.1039/C2JM33669C
Citation: J. Mater. Chem., 2012,22, 20689-20695
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    Low driving voltage characteristics of triphenylene derivatives as electron transport materials in organic light-emitting diodes

    K. Togashi, S. Nomura, N. Yokoyama, T. Yasuda and C. Adachi, J. Mater. Chem., 2012, 22, 20689
    DOI: 10.1039/C2JM33669C

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