100% phosphorescence quantum efficiency of Ir(III) complexes in organic semiconductor films

• Kawamura, Yuichiro

  CREST Program, Japan Science and Technology Agency (JST)

• Goushi, Kenichi

  Department of Photonics Materials Science, Chitose Institute of Science and Technology (CIST)

• Brooks, Jason

  Universal Display Corporation (UDC)

• Brown, Julie J.

  Universal Display Corporation (UDC)

• Sasabe, Hiroyuki

  CREST Program, Japan Science and Technology Agency (JST) | Department of Photonics Materials Science, Chitose Institute of Science and Technology (CIST)

• Adachi, Chihaya

  CREST Program, Japan Science and Technology Agency (JST) | Department of Photonics Materials Science, Chitose Institute of Science and Technology (CIST)

Abstract

We demonstrate that three Ir(III) complexes used as principal dopants in organic electrophosphorescent diodes have very high photoluminescence quantum efficiency (ηPL) in a solid-state film. The green emitting complex, fac-tris(2-phenylpyridinato)iridium(III) [Ir(ppy)3], the red-emitting bis[2-(2′-benzothienyl)pyridinato-N,C3′] (acetylacetonato)iridium(III) [Btp2Ir(acac)], and the blue complex bis[(4,6-difluorophenyl)pyridinato-N,C2](picolinato)iridium(III) (FIrpic) were prepared as codeposited films of varying concentration with 4,4′-bis(N-carbazolyl)-2,2′-biphenyl, a commonly used host material. The maximum ηPL values for Ir(ppy)3, Btp2Ir(acac), and FIrpic were, respectively, 97%±2% (at 1.5 mol%), 51%±1% (at 1.4 mol%), and 78%±1% (at 15 mol%). Furthermore, we also observed that the maximum ηPL of FIrpic reached 99%±1% when doped into the high triplet energy host, m-bis(N-carbazolyl)benzene, at an optimal concentration of 1.2 mol%.

Journal

• Applied Physics Letters

  Applied Physics Letters 86 (7), 2005-05-05

  American Institute of Physics

Details

• CRID: 1050017057728388096
• NII Article ID: 120002893745
• NII Book ID: AA00543431
• HANDLE: 2324/19453
• Text Lang: en
• Article Type: journal article
• Data Source:
  • IRDB
  • CiNii Articles