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Issue 29, 2015
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Benzobisoxazole-based electron transporting materials with high Tg and ambipolar property: high efficiency deep-red phosphorescent OLEDs

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Abstract

Two new benzobisoxazole-based compounds, namely, 4,8-bis(3,5-di(pyridin-3-yl)phenyl)-2,6-dimethylbenzo[1,2-d:4,5-d′]bis(oxazole) (3Py-DBBO) and 4,8-bis(4-yl-triphenylphosphine oxide)-2,6-dimethylbenzo[1,2-d:4,5-d′]bis(oxazole) (TPO-DBBO), were synthesized and characterized. The steric effect of the ortho hydrogens on the phenyl ring at 4,8-positions of benzobisoxazole resulted in out-of-plane twisting, and consequently a decrease of the intermolecular π–π interaction. The two new compounds showed excellent thermal stabilities with high glass-transition temperatures (Tg) of 248 °C for 3Py-DBBO and 142 °C for TPO-DBBO. The two compounds exhibited ambipolar transport properties, with both electron and hole mobilities of 10−6–10−5 cm2 V−1 s−1. Using the compounds as electron-transport materials, the deep-red phosphorescent organic light-emitting devices achieved a maximum external quantum efficiency up to 19.3%.

Graphical abstract: Benzobisoxazole-based electron transporting materials with high Tg and ambipolar property: high efficiency deep-red phosphorescent OLEDs

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Publication details

The article was received on 13 May 2015, accepted on 24 Jun 2015 and first published on 25 Jun 2015


Article type: Paper
DOI: 10.1039/C5TC01353D
J. Mater. Chem. C, 2015,3, 7589-7596

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    Benzobisoxazole-based electron transporting materials with high Tg and ambipolar property: high efficiency deep-red phosphorescent OLEDs

    X. Yin, T. Zhang, Q. Peng, T. Zhou, W. Zeng, Z. Zhu, G. Xie, F. Li, D. Ma and C. Yang, J. Mater. Chem. C, 2015, 3, 7589
    DOI: 10.1039/C5TC01353D

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