Carbon nanotube modified electrodes for enhanced brightness in organic light emitting devices

A. R. Inigo, J. M. Underwood, S. R. P. Silva

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Acid oxidised multiwall carbon nanotubes (COOH-MWCNT) have been introduced as a hole injection buffer layer in an organic light emitting diodes (OLED). We show that the OLED with COOH-MWCNT as a buffer layer provides higher brightness with lower operating voltages. The addition of a COOH-MWCNT buffer layer has enabled a further increase in the brightness of our OLED devices operating in excess of 20,000 cd/m(2) due to enhanced hole injection by several orders of magnitude. The increase in current injection and brightness does not alter the optical emission spectrum at different operating voltages in these devices. A model is proposed to explain this increase in current injection and brightness based on the modified electron energy band alignment. (C) 2011 Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)4211-4217
Number of pages7
JournalCarbon
Volume49
Issue number13
DOIs
Publication statusPublished - Nov 2011

Keywords

  • carbon nanotube
  • modified electrodes
  • enhanced brightness
  • organic
  • light emitting devices

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