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Efficient red AIEgens based on tetraphenylethene: Synthesis, structure, photoluminescence and electroluminescence

Abstract

Red emitters are very important for the colour display and white lighting devices. However, efficient remitters are relatively rare because they often suffer from aggregation-caused quenching problem. In this work, a series of robust red molecules consisting of tetraphenylethene, benzo-2,1,3-thiadiazole, phenanthro[9,10-d]imidazole and triphenylamine moieties are synthesized and fully characterized. The photophysical property, transient fluorescence decay, thermal stability, and electrochemical behaviors and electronic structures are thoroughly investigated. The results show that these molecules have high thermal and electrochemical stabilities. They show aggregation-induced emission (AIE) property and emit strong red fluorescence in the aggregated state, which can be well modulated by functional groups. Nondoped OLEDs are fabricated by using these red molecules as light-emitting layers, offering red electroluminescence at 650 nm (CIEx,y = 0.665, 0.334) and high luminance and external quantum efficiency of up to 6277 cd m−2 and 2.17%, respectively. Moreover, a solution-processed red OLED with good performance is also achieved. This work not only present efficient red emitters for nondoped OLEDs, but also provide useful structure-property relationship insights for further development of efficient red luminescent materials.

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Publication details

The article was accepted on 30 Apr 2018 and first published on 01 May 2018


Article type: Paper
DOI: 10.1039/C8TC01612G
Citation: J. Mater. Chem. C, 2018, Accepted Manuscript
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    Efficient red AIEgens based on tetraphenylethene: Synthesis, structure, photoluminescence and electroluminescence

    Y. Li, W. Wang, Z. Zhuang, Z. Wang, G. Lin, P. Shen, S. Chen, Z. Zhao and B. Z. Tang, J. Mater. Chem. C, 2018, Accepted Manuscript , DOI: 10.1039/C8TC01612G

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