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Stable, Glassy, and Versatile Binaphthalene Derivatives Capable of Efficient Hole Transport, Hosting, and Deep-Blue Light Emission

Authors

  • Bin Wei,

    1. Key Laboratory of Advanced Display and System Applications Ministry of Education, Shanghai University, P. O. B. 143, 149 Yanchang Road, Shanghai 200072 (China)
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  • Ji-Zhong Liu,

    1. Key Laboratory of Advanced Display and System Applications Ministry of Education, Shanghai University, P. O. B. 143, 149 Yanchang Road, Shanghai 200072 (China)
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  • Yong Zhang,

    1. Key Laboratory of Advanced Display and System Applications Ministry of Education, Shanghai University, P. O. B. 143, 149 Yanchang Road, Shanghai 200072 (China)
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  • Jian-Hua Zhang,

    1. Key Laboratory of Advanced Display and System Applications Ministry of Education, Shanghai University, P. O. B. 143, 149 Yanchang Road, Shanghai 200072 (China)
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  • Hua-Nan Peng,

    1. Department of Chemistry, School of Science, Nanchang University, 999 Xue-Fu Road, Hong-Gu-Tan New District, Nanchang 330031 (China)
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  • He-Liang Fan,

    1. Department of Chemistry, School of Science, Nanchang University, 999 Xue-Fu Road, Hong-Gu-Tan New District, Nanchang 330031 (China)
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  • Yan-Bo He,

    1. Department of Chemistry, School of Science, Nanchang University, 999 Xue-Fu Road, Hong-Gu-Tan New District, Nanchang 330031 (China)
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  • Xi-Cun Gao

    Corresponding author
    1. Department of Chemistry, School of Science, Nanchang University 999 Xue-Fu Road, Hong-Gu-Tan New District, Nanchang 330031 (China) and State Key Lab of Silicon Materials, Zhejiang University, Hangzhou 310027 (China)
    2. Department of Chemistry, School of Science, Nanchang University, 999 Xue-Fu Road, Hong-Gu-Tan New District, Nanchang 330031 (China)
    • State Key Lab of Silicon Materials, Zhejiang University, Hangzhou 310027 (China).
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Abstract

Organic light-emitting diodes (OLEDs) have great potential applications in display and solid-state lighting. Stability, cost, and blue emission are key issues governing the future of OLEDs. The synthesis and photoelectronics of a series of three kinds of binaphthyl (BN) derivatives are reported. BN1–3 are “melting-point-less” and highly stable materials, forming very good, amorphous, glass-like films. They decompose at temperatures as high as 485–545 °C. At a constant current density of 25 mA cm−2, an ITO/BN3/Al single-layer device has a much-longer lifetime (>80 h) than that of an ITO/NPB/Al single-layer device (8 h). Also, the lifetime of a multilayer device based on BN1 is longer than a similar device based on NPB. BNs are efficient and versatile OLED materials: they can be used as a hole-transport layer (HTL), a host, and a deep-blue-light-emitting material. This versatility may cut the cost of large-scale material manufacture. More importantly, the deep-blue electroluminescence (emission peak at 444 nm with CIE coordinates (0.16, 0.11), 3.23 cd A−1 at 0.21 mA cm−2, and 25200 cd m−2 at 9 V) remains very stable at very high current densities up to 1000 mA cm−2.

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