Direct Observation of Efficient Triplet--Triplet Energy Transfer in Phosphorescent Organic Light-Emitting Diode

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概要

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• We report on the energy transfer mechanism between the host and the iridium dopant in phosphorescent organic light-emitting diodes (PHOLEDs). The excited-state energies of the host and the dopant are carefully defined to discuss the energy transfer. The PHOLED using bis(benzo[h]quinolin-10-olato-kN,kO)beryllium(II) (Bebq<inf>2</inf>) as the host and bis(4-pentafluorophenyl-2-phenylpyridine)(acetylacetonate)iridium(III) (m-PF-py) as the dopant shows a maximum external quantum efficiency (\eta_{\text{ext}}) of about 15%, whereas the photoluminescence quantum yield of the emitting layer film is only 19%. The high \eta_{\text{ext}} of the PHOLED implies efficient triplet--triplet energy transfer from Bebq<inf>2</inf>to m-PF-py.

• 2013-05-25

著者

• YAMAMOTO Toshihiro

  Japan Atomic Energy Agency

• Shimidzu Naoki

  Japan Broadcasting Corporation (NHK), Science and Technology Research Laboratories, Setagaya, Tokyo 157-8510, Japan

• Fukagawa Hirohiko

  Japan Broadcasting Corporation (NHK), Science and Technology Research Laboratories, Setagaya, Tokyo 157-8510, Japan

• Shimizu Takahisa

  Japan Broadcasting Corporation (NHK), Science and Technology Research Laboratories, Setagaya, Tokyo 157-8510, Japan

• Osada Yoshichika

  Tokyo University of Science, Shinjuku, Tokyo 162-8610, Japan

• Kamada Taisuke

  Tokyo University of Science, Shinjuku, Tokyo 162-8610, Japan

• Kiribayashi Yukihiro

  Tokyo University of Science, Shinjuku, Tokyo 162-8610, Japan

• SHIMIDZU Naoki

  Japan Broadcasting Corporation (NHK), Science and Technology Research Laboratories

• OSADA Yoshichika

  Tokyo University of Science

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• Modified Quasi-Steady-State Method to Evaluate the Mean Power Profiles of Nuclear Excursions in Fissile Solution
• Direct Observation of Efficient Triplet--Triplet Energy Transfer in Phosphorescent Organic Light-Emitting Diode
• Direct Observation of Efficient Triplet-Triplet Energy Transfer in Phosphorescent Organic Light-Emitting Diode

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