稀土配合物分子内能量传递和弛豫过程的光声和荧光光谱研究

Study on Intramolecular Energy Transfer and Relaxation Processes of Rare Earth Complexes by Photoacoustic and Fluorescence Spectroscopy

将光声光谱和荧光光谱两种互补的手段结合起来 ,从无辐射跃迁和辐射跃迁两个角度讨论了固态稀土配合物的激发 弛豫过程。测定了稀土配合物 (Tb(AA) 3·2H2 O、Tb(AA) 3bpy和Tb(AA) 3phen)固体粉末的光声光谱和荧光光谱。与荧光光谱相结合 ,光声光谱反映了不同配合物发光效率的变化 ,Tb(AA) 3phen、Tb(AA) 3·2H2 O和Tb(AA) 3bpy的发光效率依次增强。研究了配合物的分子内能量传递和弛豫过程 。

The excitation-relaxation processes of the solid Tb( III ) complexes (Tb(AA)(3) . 2H(2)O, Tb(AA)(3) bpy and Tb(AA)(3) phen) have been studied by photoacoustic spectroscopy (PAS) with the conjunction of fluorescence spectroscopy. The relaxation processes are studied from two aspects: nonradiative process and radiative process. The photoacoustic amplitude spectra and luminescence spectra of the complexes have been measured. Combined with the luminescence spectra,the PA amplitude spectra reflect the variation of the luminescence efficiency. According to the variation of the luminescence efficiency, the intramolecular energy transfer and relaxation processes of the complexes were studied. The suitability of the energy gap between the lowest triplet level of ligand and resonance energy level of rare earth ion is critical for efficient energy transfer.