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

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)3156-3161
Number of pages6
JournalJapanese Journal of Applied Physics
Volume47
Issue number4 PART 2
DOIs
Publication statusPublished - 2008 Apr 25
Externally publishedYes

Fingerprint

polymerization
Polymerization
Self assembled monolayers
Tin oxides
Indium
indium oxides
tin oxides
injection
Physical vapor deposition
Organic light emitting diodes (OLED)
Silanes
Polymer films
carbazoles
Luminescence
Evaporation
silanes
Monomers
Irradiation
Aluminum
light emitting diodes

Keywords

  • Deposition polymerization
  • OLED
  • Organic EL
  • Organic light-emitting diode
  • SAM
  • Self-assembled monolayer
  • Surface-initiated polymerization

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

Interface control by surface-initiated deposition polymerization and its application to organic light-emitting devices. / Kawakami, Akira; Katsuki, Kiyoi; Advincula, Rigoberto C.; Tanaka, Kuniaki; Ogino, Kenji; Usui, Hiroaki.

In: Japanese Journal of Applied Physics, Vol. 47, No. 4 PART 2, 25.04.2008, p. 3156-3161.

Research output: Contribution to journalArticle

Kawakami, Akira ; Katsuki, Kiyoi ; Advincula, Rigoberto C. ; Tanaka, Kuniaki ; Ogino, Kenji ; Usui, Hiroaki. / Interface control by surface-initiated deposition polymerization and its application to organic light-emitting devices. In: Japanese Journal of Applied Physics. 2008 ; Vol. 47, No. 4 PART 2. pp. 3156-3161.
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