Enhanced luminescence of rare-earthTb (III) by Tm (III) in bis(benzoylmethyl) sulfoxide complexes and intra-molecular energy transfer |
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Authors: | Lei Guo Wen-Xian Li Xiao-Yan Shi Xue-Lian Sun |
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Institution: | a College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot 010021, PR China b Department of Chemistry, Tongji University, Shanghai 200092, PR China |
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Abstract: | Rare-earth complexes (TbxTmy)L5(ClO4)2](ClO4)·3H2O(x:y=1.000:0.000, 0.999:0.001, 0.995:0.005, 0.990:0.010, 0.950:0.050, 0.900:0.100, 0.800:0.200, 0.700:0.300; L=C6H5COCH2SOCH2COC6H5) were synthesized and characterized with elemental analysis, infrared spectra (IR) and 1H NMR. The photophysical properties of these complexes were studied in detail with ultraviolet absorption spectra, fluorescent spectra and lifetimes. The fluorescence spectra and decay curves of complexes indicated that the fluorescence emission intensity was enhanced and the fluorescence lifetime was prolonged by Tm (III), which may be due to the intra-molecular energy transfer between inert rare-earth ions and active rare-earth ions. The complexes showed the best properties when the mole ratio of Tb (III) to Tm (III) is 0.995:0.005. The intensity of fluorescence can be increased to 208%. Additionally, the energy-transfer mechanisms between the ligand and the central Tb (III) ions were discussed. |
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Keywords: | Rare-earth complex Fluorescence Luminescence enhancement Energy transfer |
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