100% phosphorescence quantum efficiency of Ir(III) complexes in organic semiconductor films
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- Yuichiro Kawamura
- CREST Program, Japan Science and Technology Agency (JST) , 1-32-12 Higashi, Shibuya, Tokyo 150-0011, Japan
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- Kenichi Goushi
- Department of Photonics Materials Science, Chitose Institute of Science and Technology (CIST) , 758-65 Bibi, Chitose, Hokkaido 066-8655, Japan
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- Jason Brooks
- Universal Display Corporation (UDC) , 375 Phillips Boulevard, Ewing, New Jersey 08618
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- Julie J. Brown
- Universal Display Corporation (UDC) , 375 Phillips Boulevard, Ewing, New Jersey 08618
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- Hiroyuki Sasabe
- CREST Program, Japan Science and Technology Agency (JST) , 1-32-12 Higashi, Shibuya, Tokyo 150-0011, Japan and Department of Photonics Materials Science, Chitose Institute of Science and Technology (CIST), 758-65 Bibi, Chitose, Hokkaido 066-8655, Japan
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- Chihaya Adachi
- CREST Program, Japan Science and Technology Agency (JST) , 1-32-12 Higashi, Shibuya, Tokyo 150-0011, Japan and Department of Photonics Materials Science, Chitose Institute of Science and Technology (CIST), 758-65 Bibi, Chitose, Hokkaido 066-8655, Japan
説明
<jats:p>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 1.5mol%), 51%±1% (at 1.4mol%), and 78%±1% (at 15mol%). 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 1.2mol%.</jats:p>
収録刊行物
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- Applied Physics Letters
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Applied Physics Letters 86 (7), 071104-, 2005-02-08
AIP Publishing
