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Molecularly engineered electroplex emission for an efficient near-infrared light-emitting electrochemical cell (NIR-LEC)

机译:用于高效近红外发光电化学电化学电池(NIR-LEC)的分子工程化电量排放

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摘要

Electroplex emission is rarely seen in ruthenium polypyridyl complexes, and there have been no reports from light-emitting electrochemical cells (LECs) to date. Here, for the first time, near-infrared (NIR) emission via the electroplex mechanism in a LEC based on a new blend of ruthenium polypyridyl complexes is described. The key factor in the design of the new complexes is the 0.4 V decrease in the oxidation half-potential of Ru(ii)/Ru(iii) in [Ru(DPCO)(bpy)(2)]ClO4 (DPCO = diphenylcarbazone, bpy = 2,2 bipyridine), which is about one-third of the value for benchmark [Ru(bpy)(3)](ClO4)(2), as well as the long lifetime of excited states of 350-450 ns. The LEC based on the new blend with a narrow band gap (approximate to 1.0 eV) of a Ru(DPCO) complex and Ru(bpy)(3)(2+) can produce an electroluminescence spectrum centred at about 700 nm, which extends to the NIR region with a high external quantum efficiency (EQE) of 0.93% at a very low turn-on voltage of 2.6 V. In particular, the very simple LEC structure was constructed from indium tin oxide (anode)/Ru(DPCO):Ru(bpy)(3)(2+)/Ga:In (cathode), avoiding any polymer or transporting materials, as well as replacing Al or Au by a molten alloy cathode. This system has promising applications in the production of LECs via microcontact or inkjet printing.
机译:电致发光是很少见的钌多吡啶配合物,并没有出现过,从发光电化学电池(LEC)迄今报告。这里,对于第一次,通过基于对钌多吡啶配合新的共混物在一个LEC的电致机构近红外(NIR)发射进行说明。在新的复合物的设计中的关键因素是在钌(II)/钌(III)中的[Ru(DPCO)(联吡啶)(2)] CLO4(DPCO =二苯卡巴腙的氧化半电位0.4伏下降,联吡啶= 2,2联吡啶),它是约三分之一的值的基准为的[Ru(联吡啶)(3)](CLO4)(2),以及350-450纳秒激发态的寿命长。基于新的共混物具有窄的带隙的钌(DPCO)的(近似1.0电子伏特)络合物和Ru的LEC(BPY)(3)(2+)能够产生在约700nm为中心的电致发光光谱,其延伸用的0.93%在高的外部量子效率(EQE)的NIR区域非常低的导通2.6 V.在特定的电压,非常简单的LEC结构从氧化铟锡(阳极)构造/钌(DPCO) :吡啶钌(3)(2 +)/ GA:在(阴极),以避免任何聚合物或传输材料,以及由熔融合金阴极替换的Al或Au。该系统具有广阔的通过微或喷墨印刷生产的LEC的应用。

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  • 来源
    《RSC Advances》 |2020年第24期|共8页
  • 作者单位

    Univ Zanjan Chem Dept Grp Mol Engn Adv Funct Mat GMA Zanjan Iran;

    Univ Zanjan Chem Dept Grp Mol Engn Adv Funct Mat GMA Zanjan Iran;

    Univ Zanjan Chem Dept Grp Mol Engn Adv Funct Mat GMA Zanjan Iran;

    Univ Zanjan Chem Dept Grp Mol Engn Adv Funct Mat GMA Zanjan Iran;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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