Interface control by surface-initiated deposition polymerization and its application to organic light-emitting devices

Akira Kawakami*, Kiyoi Katsuki, Rigoberto C. Advincula, Kuniaki Tanaka, Kenji Ogino, Hiroaki Usui

*この研究の対応する著者

研究成果: Article査読

21 被引用数 (Scopus)

抄録

Surface-initiated deposition polymerization was applied to the preparation of a hole transport layer (HTL) on an indium-tin oxide (ITO) electrode. A silane-based self-assembled monolayer (SAM) that has an azo terminal group was prepared on an ITO surface on which a vinyl monomer of carbazole (CPA) or tetraphenyldiaminobiphenyl (vTPD) was deposited by physical vapor deposition. The polymerization of the HTL was achieved by electron-assisted deposition. UV irradiation, as well as conventional evaporation, was not capable of growing polymer films on the SAM. Organic light-emitting diodes (OLEDs) were prepared by depositing tris(8-quinolinolato) aluminum (Alq3) on the HTL. The surface-initiated deposition polymerization was effective in markedly increasing device current flow and reducing turn-on voltage. However, luminescence efficiency was not improved by this method owing to improper carrier balance under excessive hole injection. Nevertheless, surface-initiated deposition polymerization was effective in improving film morphology, stability, and hole injection characteristics.

本文言語English
ページ(範囲)3156-3161
ページ数6
ジャーナルJapanese Journal of Applied Physics
47
4 PART 2
DOI
出版ステータスPublished - 2008 4 25
外部発表はい

ASJC Scopus subject areas

  • 工学(全般)
  • 物理学および天文学(全般)

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