Spin-assembled nanolayer of a hyperbranched polymer on the anode in organic light-emitting diodes: The mechanism of hole injection and electron blocking

Tae Woo Lee, Jong Jin Park, Young Kwon, Teruaki Hayakawa, Tae Lim Choi, Jong Hyeok Park, Rupasree Ragini Das, Masa Aki Kakimoto

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

We introduced a spin-assembled nanolayer of hyperbranched poly(ether sulfone) with sulfonic acid terminal on top of an indium-tin oxide anode in organic light-emitting diodes. This results in great improvement in luminous efficiency, better than that of devices using a commercially available conducting polymer composition as a holeinjection layer. The effect of the nanolayer was investigated by impedance spectroscopy, photovoltaic measurement for built-in-potential, and transient electroluminescence. We concluded that the high luminous efficiency resulted from the efficient electron-blocking by the nanolayer and hole-injection assisted by the accumulation of electrons at the interface. This result implies that, for an efficient hole-injection layer, the electron-blocking capability should be incorporated in addition to the hole-injection and -transport capability.

Original languageEnglish
Pages (from-to)12704-12709
Number of pages6
JournalLangmuir
Volume24
Issue number21
DOIs
Publication statusPublished - 2008 Nov 4

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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