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

Kazunori Togashi, Shintaro Nomura, Norimasa Yokoyama, Takuma Yasuda, Chihaya Adachi

研究成果: ジャーナルへの寄稿記事

70 引用 (Scopus)

抜粋

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.

元の言語英語
ページ(範囲)20689-20695
ページ数7
ジャーナルJournal of Materials Chemistry
22
発行部数38
DOI
出版物ステータス出版済み - 10 14 2012

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Chemistry

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