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High-Performance All-Polymer White-Light-Emitting Diodes Using Polyfluorene Containing Phosphonate Groups as an Efficient Electron-Injection Layer

机译：使用含膦酸酯基团的聚芴作为高效电子注入层的高性能全聚合物白光发光二极管

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摘要

We report an efficient non-doped all-polymer polymer white-light-emitting diode (PWLED) with a fluorescent three-color, white single polymer as an emissive layer, an ethanol-soluble phosphonate-functionalized polyfluorene (PF-EP) as an electron-injection/electron-transport layer, and LiF/Al as a cathode, respectively. The all-polymer PWLED achieves a peak external quantum efficiency of 6.7%, a forward viewing luminous efficiency of 15.4 cd A~(-1) and a power efficiency of 11.4 Im W~(-1) respectively, at a brightness of 347 cd m~(-2) with Commission Internationale d'Eclairage coordinates of (0.37, 0.42) and color rendering index of 85, which is the best results among the non-doped PWLEDs. Moreover, this kind of PWLED not only shows excellent color stability, but also achieves high brightness at low voltages. The brightness reaches 1000,10000, and 46830 cd m~(-2) at voltages of 4.5, 5.4, and 7.5 V, respectively. The significant enhancement of white-single-polymer-based PWLEDs with PF-EP/LiF/Al to replace for the commonly used Ca/Al cathode is attributed to the more efficient electron injection at PF-EP/LiF/Al interfaces, and the coordinated protecting effect of PF-EP from diffusion of Al atoms into the emissive layer and exciton-quenching near cathode interfaces. The developed highly efficient non-doped all-polymer PWLEDs are well suitable for solution-processing technology and provide a huge potential of low-cost large-area manufacturing for PWLEDs.
机译：我们报告了一种高效的非掺杂全聚合物聚合物白光发光二极管（PWLED），其荧光三色，白色单一聚合物作为发光层，乙醇溶性膦酸酯官能化聚芴（PF-EP）作为电子注入/电子传输层，以及分别作为阴极的LiF / Al。全聚合物PWLED在347 cd的亮度下，峰值外部量子效率为6.7％，前向发光效率为15.4 cd A〜（-1），功率效率为11.4 Im W〜（-1）。 m〜（-2）的国际照明委员会坐标为（0.37，0.42），显色指数为85，这是非掺杂PWLED中最好的结果。而且，这种PWLED不仅显示出优异的色彩稳定性，而且在低电压下也能获得高亮度。在4.5、5.4和7.5 V的电压下，亮度分别达到1000,10000和46830 cd m〜（-2）。用PF-EP / LiF / Al代替常用的Ca / Al阴极，大大增强了基于白单聚合物的PWLED，这归因于PF-EP / LiF / Al界面的电子注入效率更高，并且PF-EP对铝原子扩散到发光层以及阴极界面附近的激子猝灭具有协同保护作用。开发的高效无掺杂全聚合物PWLED非常适合溶液处理技术，并为PWLED的低成本大面积制造提供了巨大潜力。

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  • 来源
    《Advanced Functional Materials》 |2010年第17期|P.2951-2957|共7页
  • 作者

    Baohua Zhang; Chuanjiang Qin; Junqiao Ding; Lei Chen; Zhiyuan Xie; Yanxiang Cheng; Lixiang Wang;

  • 作者单位

    State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022, (P. R. China) Graduate School of the Chinese Academy of Sciences Beijing 100039, (P. R. China);

    rnState Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022, (P. R. China);

    rnState Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022, (P. R. China);

    rnGraduate School of the Chinese Academy of Sciences Beijing 100039, (P. R. China);

    rnState Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022, (P. R. China);

    rnState Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022, (P. R. China);

    rnState Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022, (P. R. China);

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