Highly efficient solution-processed red organic light-emitting diodes with long-side-chained triplet emitter

Yu Chiang Chao, Sheng Yang Huang, Chun Yu Chen, Yu Fan Chang, Hsin Fei Meng, Feng Wen Yen, I. Feng Lin, Hsiao Wen Zan, Sheng Fu Horng

Research output: Contribution to journalArticle

25 Citations (Scopus)


Newly synthesized red Ir complexes tris[2-(4-n-hexyl-phenyl)quinoline] iridium(III) and tris[(4-n-hexylphenyl)isoquinoline)]iridium(III) with long alkyl side chains are utilized to demonstrate the high efficiency multi-layer solution-processed red organic light-emitting diodes. Solubilities of these triplet emitters are high which enable them to be uniformly dispersed in the polymer host. Blade coating method is utilized to prepare organic multi-layers without mutual dissolution between different layers. 17 cd/A current efficiency, 10 lm/W power efficiency, and 8.8% external quantum efficiency can be achieved for the device with CsF/Al cathode. 10,000 cd/m2 is reached at 10 V. Similar quantum efficiency is also achieved with an electron-transport layer and LiF/Al cathode.

Original languageEnglish
Pages (from-to)148-152
Number of pages5
JournalSynthetic Metals
Issue number1-2
Publication statusPublished - 2011 Jan 1



  • Ir complexes
  • Polymer light-emitting diodes

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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