Application of wide-energy-gap material 3,4-di(9H-carbazol-9-yl)benzonitrile in organic light-emitting diodes

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Article

Tanaka, Yuya¹  Takahashi, Takehiro²  Nishide, Junichi³  Hiraga, Yasuhide³  Nakanotani, Hajime⁴  Adachi, Chihaya^4,5 

[1] Japan Display Inc, Ctr Res & Dev, Minato Ku, Tokyo 1050003, Japan

[2] Hodogaya Chem Co Ltd, Res & Dev Dept, Tsukuba, Ibaraki 3050841, Japan

[3] Hirata Corp, Kita Ku, Kumamoto 8610198, Japan

[4] Kyushu Univ, Ctr Organ Photon & Elect Res OPERA, Nishi Ku, Fukuoka 8190395, Japan

[5] Kyushu Univ, Int Inst Carbon Neutral Energy Res WPI I2CNER, Nishi Ku, Fukuoka 8190395, Japan

关键词: Organic light-emitting diode;    Thermally activated delayed fluorescence;    Pure blue emission;    Wide-energy-gap material;    Charge carrier transport;   

DOI  :  10.1016/j.tsf.2016.11.016

来源: Elsevier

【 摘 要 】

A material with a wide energy gap, 3,4-di(9H-carbazol-9-yl) benzonitrile (2CzBN), was synthesized and applied in organic light-emitting diodes (OLEDs). Pure blue electroluminescence with a peak wavelength of 436 nm and Commission Internationale de l'Eclairage (CIE) coordinate of (0.160, 0.084) were obtained for an OLED containing 2CzBN as an emitter, although its external emission efficiency was limited to around 1% because of the lack of thermally activated delayed fluorescence (TADF) activity. In contrast, a highly efficient TADF-based OLED was obtained when 2CzBN was used as a host instead of an emitter by taking advantage of the high triplet energy (2.92 eV) and unexpected electron transport capability of 2CzBN. (C) 2016 Elsevier B.V. All rights reserved.

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