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Issue 4, 2017
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Pyrene-centered cyanophenyl end-capped starbursts: design, synthesis, stabilized blue electroluminescence and lasing properties

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Abstract

A novel class of monodisperse starburst molecules (T1–T3), which are comprised of a pyrene core, four short oligofluorene arms and cyanophenyl end-cappers, were designed and synthesized to explore the influence of electron-withdrawing moieties on their optoelectronic properties. The resulting materials demonstrated high fluorescence yields and excellent thermal stability with a high degradation temperature (Td) of over 400 °C. Non-doped electroluminescent devices with the configuration of ITO/PEDOT:PSS/T1–T3/TPBI/LiF/Al exhibited highly efficient and stabilized blue electroluminescence (EL). Among all these solution-processed devices, T1 possessed the best performance with a maximum luminous efficiency (LE) of 3.52 cd A−1 at 25 mA cm−2 and a maximum brightness of 9194 cd m−2 at 10 V, resulting from the improved electron affinity due to the large content of electron-withdrawing cyanophenyl moieties in the starbursts. Notably, the net gain coefficients reached 46–55 cm−1. Moreover, the amplified spontaneous emission (ASE) threshold value remained detectable upon thermal annealing temperatures up to 230 °C for T1 and 280 °C for T2–T3. 1D DFB lasing (50% fill factor, pumped source at 375 nm) was thus obtained, demonstrating a low lasing threshold. The results confirm that the incorporation of cyanophenyl moieties as end cappers can enhance the electrical properties of pyrene-centered starbursts without substantially sacrificing their great optical gain properties, which makes this series of materials very promising for electrically pumped organic lasers.

Graphical abstract: Pyrene-centered cyanophenyl end-capped starbursts: design, synthesis, stabilized blue electroluminescence and lasing properties

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Publication details

The article was received on 20 Jul 2016, accepted on 16 Sep 2016 and first published on 28 Sep 2016


Article type: Research Article
DOI: 10.1039/C6QM00133E
Citation: Mater. Chem. Front., 2017,1, 668-676
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    Pyrene-centered cyanophenyl end-capped starbursts: design, synthesis, stabilized blue electroluminescence and lasing properties

    M. Fang, J. Huang, Y. Zhang, X. Guo, X. Zhang, C. Liu, W. Lai and W. Huang, Mater. Chem. Front., 2017, 1, 668
    DOI: 10.1039/C6QM00133E

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