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Highly efficient blueish-green fluorescent OLEDs based on AIE liquid crystal molecules: From ingenious molecular design to multifunction materials

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Author(s)

  • Yafei Wang
  • Yuanwei Liao
  • Christopher P. Cabry
  • Di Zhou
  • Guohua Xie
  • Zuoming Qu
  • Duncan W. Bruce
  • Weiguo Zhu

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Publication details

JournalJournal of Materials Chemistry C
DateAccepted/In press - 20 Mar 2017
DateE-pub ahead of print - 20 Mar 2017
DatePublished (current) - 28 Apr 2017
Issue number16
Volume5
Number of pages10
Pages (from-to)3999-4008
Early online date20/03/17
Original languageEnglish

Abstract

In order to seek the balance point between liquid crystallinity and high efficiency emission, two novel aggregation-induced emission-based (AIE) liquid crystal materials of TPE-PBN and TPE-2PBN, which contain a tetraphenylethene derivative as the emission core and a 4-cynobiphenyl moiety as the mesogenic unit, were designed and prepared. Both simple molecules showed a mesophase at high temperature as evidenced by polarised optical microscopy (POM), differential scanning calorimetry (DSC) and temperature-dependent X-ray diffraction (XRD). Simultaneously, TPE-PBN and TPE-2PBN presented clear AIE characteristics in the blueish-green region and achieved a high emission quantum efficiency of 71% and 83% in the solid state, respectively. Due to the self-assembly properties of thermotropic liquid crystals, both compounds showed higher hole mobilities in the annealed films than in pristine films. Employing TPE-PBN and TPE-2PBN as the emitting materials, both non-doped devices and doped devices were fabricated. The TPE-PBN-based doped OLEDs showed a better device performance with an external quantum efficiency (EQE) of 4.1% which is among the highest EQEs of blue AIE fluorescent OLEDs.

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