Here, we report two europium(III) complexes (Eu1 and Eu2) with high photoluminescence quantum yield, based on tridentate isoquinoline derivatives (HL1 and HL2). The single crystal structures of Eu1 and Eu2 show that three ligands coordinate with an Eu(III) ion through diphenylphosphoryl oxygen, pyridyl nitrogen and carboxyl oxygen atoms (O^N^O) with no solvent in the first coordination sphere. An appropriate triplet energy level (about 20 000 cm⁻¹) ensures efficient energy transfer from the ligands to the Eu(III) ion. As a result, the two complexes exhibited significantly high quantum yields in the solid state (94% and 87% for Eu1 and Eu2, respectively) with excitation bands extending to 350 nm.

中文翻译：

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基于三齿异喹啉配体的发光euro（III）络合物，具有极高的量子产率

在这里，我们报告基于三齿异喹啉衍生物（HL1和HL2）的两个具有高光致发光量子产率的euro（III）配合物（Eu1和Eu2）。Eu1和Eu2的单晶结构表明，三个配体通过二苯基磷酰氧，吡啶氮和羧基氧原子（O ^ N ^ O）与Eu（III）离子配位，而在第一配位球中没有溶剂。适当的三重态能级（约20000 cm ^-1）可确保从配体到Eu（III）离子。结果，这两种配合物在固态下表现出显着高的量子产率（Eu1和Eu2分别为94％和87％），激发带延伸至350 nm。