Improvement of roll-off in power efficiency for mixed single layer organic light emitting devices by co-doping

Yanhui Lou, Zhenduo Geng, Zhaokui Wang*, Shigeki Naka, Hiroyuki Okada

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Roll-off phenomena in power efficiency for rubrene-based mixed single layer organic light emitting devices is investigated. The evaluation of operational temperature demonstrates that Joule heating is not the main reason for roll-off in power efficiency with current density. Co-doping method through rubrene co-doping with some additive dopant, C6, DCJTB and Nile red, in mixed single layer are proposed for suppressing the roll-off in power efficiency. By co-doping suitable Nile red with rubrene, the efficiency roll-off is found to be largely improved in whole range of current density. Moreover, improved device performance is also realized even if with a 3 wt% fluorescent doping concentration. The improved performance is ascribed that there exists a competitive emission mechanism with respect to different dopant.

Original languageEnglish
Pages (from-to)1204-1209
Number of pages6
JournalSynthetic Metals
Volume162
Issue number13-14
DOIs
StatePublished - 2012/08

Keywords

  • Efficiency roll-off
  • Mixed single layer
  • Organic light emitting device

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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