We report on the exploitation of a new tetrazole-substituted 1,10-phenanthroline and a 2,2′-bipyridine (bpy) ancillary ligand modified with an electron-donating group in cationic ruthenium complexes. This complex, placed in between two electrodes without any polymer, demonstrates high efficiency near-infrared (NIR) electroluminescence (EL). The comparison between bpy and its methyl-substituted ancillary ligand shows that the cationic Ru tetrazolate complex containing methyl groups exhibits a red shift in the EL wavelength from 620 to 800 nm compared to [Ru(bpy)₃]²⁺ and an almost twofold reduction in the turn-on voltage, i.e., from 5 to 3 V, with respect to 5-tetrazole-1,10-phenanthroline. An external quantum efficiency of 0.95% for the dimethyl derivative is demonstrated, which is a remarkable result for non-doped NIR light electrochemical cells based on ruthenium polypyridyl.

中文翻译：

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基于钌四唑配合物的高效近红外光电化学电池

我们报告了在阳离子钌络合物中利用电子给体基团修饰的新的四唑取代的1,10-菲咯啉和2,2'-联吡啶（bpy）辅助配体的利用情况。这种复合物置于两个电极之间，没有任何聚合物，证明了高效率的近红外（NIR）电致发光（EL）。bpy及其甲基取代的辅助配体之间的比较表明，与[Ru（bpy）₃ ] ²⁺相比，含甲基的阳离子Ru四唑酸酯配合物在EL波长范围内显示从620到800 nm的红移，并且减少了将近两倍。在开启电压，即相对于5-四唑-1,10-菲咯啉为5至3V。已证明二甲基衍生物的外部量子效率为0.95％，对于基于钌聚吡啶基的非掺杂NIR光电化学电池而言，这是一个了不起的结果。