High efficiency red organic light-emitting diodes using a phosphorescent iridium complex doped into a hole-blocking material

Hsin Hsuan Huang, Sheng Yuan Chu, Po Ching Kao, Cheng Hsien Yang, I. Wen Sun

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

We demonstrate high-efficiency red electrophosphorescent organic light-emitting devices (OLEDs) by doping a red-emitting iridium complex, Bis[7-methyl-1-p- tolyisoquinolinato-N,C2′]-iridium(III)(acetylacetonate) [(7-mtiq)2Ir(acac)], into a hole-blocking material, 4-biphenyloxolato aluminum(III)bis(2-methyl-8- quinolinato)4-phenylphenolate. Both the phosphorescent characteristics of (7-mtiq)2Ir(acac) and the electroluminescence mechanisms of OLEDs are investigated in this study. The Commission Internationale de L'Eclairage coordinates of (0.66, 0.34) is very close to the National Television System Committee standard red point (0.66, 0.33). With a dopant concentration of about 4%, a maximum luminance of 31317 cd/m2 and a luminous efficiency of 21.6 cd/A have been obtained.

Original languageEnglish
Pages (from-to)3788-3791
Number of pages4
JournalThin Solid Films
Volume517
Issue number13
DOIs
Publication statusPublished - 2009 May 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

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