化学
光诱导电子转移
发光
电子转移
铕
猝灭(荧光)
光化学
光谱学
循环伏安法
量子产额
激发态
天线效应
氧化还原
荧光
物理化学
无机化学
离子
光电子学
原子物理学
电化学
材料科学
光学
电极
有机化学
量子力学
物理
作者
Dániel Kovács,Émilie Mathieu,Salauat R. Kiraev,J.A. Wells,Ellen Demeyere,Agnès Sipos,K. Eszter Borbas
摘要
The quenching of sensitized Eu(III) luminescence by photoinduced electron transfer from the excited light-harvesting antenna to Eu(III) was investigated. A series of complexes incorporating different metal binding sites and thus having varying Eu(III)/Eu(II) reduction potentials were prepared. The complexes were fully characterized using a combination of single-crystal X-ray crystallography and paramagnetic 1H NMR spectroscopy, the results of which support the structural similarity of the complexes. The redox and photophysical behavior of the Eu(III) center and the light-harvesting antenna were studied using cyclic voltammetry and steady-state and time-resolved emission spectroscopy on the nanosecond and millisecond time scales. The contribution of photoinduced electron transfer to the overall reduction of the Eu(III) luminescence quantum yield was found to be comparable and, in many cases, larger than the quenching caused by well-established processes such as coupling to X–H oscillators. These results suggest that the elimination or mitigation of photoinduced electron transfer could substantially improve the emissive properties of the widely used Eu(III)-based emitters.
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