Development of Phenylpyridine-Containing Wide-Energy-Gap Electron-Transporters for High Performance OLEDs

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  • SASABE Hisahiro
    Department of Organic Device Engineering, Graduate School of Science and Engineering, Yamagata University Research Center for Organic Electronics (ROEL), Yamagata University

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  • 高性能有機ELデバイスを実現するフェニルピリジン誘導体ワイドギャップ電子輸送材料の開発
  • コウセイノウ ユウキ EL デバイス オ ジツゲン スル フェニルピリジン ユウドウタイ ワイドギャップ デンシ ユソウ ザイリョウ ノ カイハツ

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Abstract

High-efficiency organic light-emitting devices (OLEDs) have received considerable attention as energy-saving next-generation light-sources. So far, we have developed a series of phenylpyridine-containing multifunctional electron-transport materials (ETMs) for realizing high-efficiency phosphorescent OLEDs. These ETMs have high triplet energy (ET1), over 2.75 eV for blue phosphorescent OLEDs, deep electron affinity for high electron-injection efficiency, high electron mobility of up to 10−4 cm2/Vs and high hole-blocking ability (ionization potential around −6.5 ~ −7.0 eV). By using these ETMs, we have successfully developed high-performance phosphorescent OLEDs with 52 lm/W for white, 57 lm/W for sky-blue, 133 lm/W for green at 100 cd/m2 without any outcoupling enhancement. Among these ETMs, a series of pyrimidine-based ETMs shows interesting thermal/optical properties, electron mobilities and molecular orientations, depending on the nitrogen position on the peripheral pyridine rings.

Journal

  • KOBUNSHI RONBUNSHU

    KOBUNSHI RONBUNSHU 70 (8), 360-369, 2013

    The Society of Polymer Science, Japan

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