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Issue 24, 2018
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Sulfur-bridged tetraphenylethylene AIEgens for deep-blue organic light-emitting diodes

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Abstract

Pure color deep-blue organic light-emitting diodes (OLEDs) with electroluminescence emission peaks in the range of 450–460 nm and high external quantum efficiency are rare. Sulfur-bridged tetraphenylethylene (TPE) was selected as a fluorophore core to develop new materials that exhibit pure color deep-blue emission and aggregation-induced emission (AIE) characteristics. Four compounds introducing carbazole and diphenylamine groups as hole-transporting units were designed and synthesized. The synthesized AIE-active materials are highly thermally stable and exhibit wide band gaps with blue fluorescence emissions positioned at 434–473 nm in the solid state. The use of the diphenylamine substituted sulfur-bridged TPE molecule in a non-doped OLED and in its doped OLED results in similarly good device performances, in which all doped OLED devices show pure color of deep-blue emissions with narrow full width at half maxima (56–65 nm) and electroluminescence peaks at 452–454 nm. Its best external quantum efficiency is 2.75% with the largest and practical luminance of 4277 cd m−2, which is among the best pure color deep-blue OLEDs based on AIE materials.

Graphical abstract: Sulfur-bridged tetraphenylethylene AIEgens for deep-blue organic light-emitting diodes

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Publication details

The article was received on 31 Mar 2018, accepted on 16 May 2018 and first published on 18 May 2018


Article type: Paper
DOI: 10.1039/C8TC01509K
J. Mater. Chem. C, 2018,6, 6534-6542

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    Sulfur-bridged tetraphenylethylene AIEgens for deep-blue organic light-emitting diodes

    Y. Cai, C. Shi, H. Zhang, B. Chen, K. Samedov, M. Chen, Z. Wang, Z. Zhao, X. Gu, D. Ma, A. Qin and B. Z. Tang, J. Mater. Chem. C, 2018, 6, 6534
    DOI: 10.1039/C8TC01509K

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