香豆素、罗丹明衍生物和DCM激光染料分子间的激发能传递

通过考察香豆素4-DCM、香豆素481-DCM、否豆素540A-罗丹明6G、香豆素540A-罗丹明640在乙醇、乙二醇等极性溶剂中的激发光谱和荧光发射光谱,研究了它们之间的激发能传递过程。

EXCITATION TRANSFER BETWEEN COUMARIN,RHODAMINE DERIVATIVES AND LASER DYE DCM MOLECULES

The excitation and fluorescence emission spectra of Coumarin 4-DCM, Coumarin 481-DCM, Coumarin 540A-Rhodamine 6G and Coumarin 540A -Rhodamine 640 systems in alcoholic solvents have been measured. The results obtained clearly show the occurance of intermolecular excitation transfer between the donor and acceptor molecules in each system examined. However, the fuorescence intensity of acceptor is increased by excitation transfer from the donor molecule. Such as in the Coumarin 4 and 481-DCM systems, the emission of coumarins is quenched by addition of DCM, but no enhancement of DCM emission is observed in these cases, and the emission intensity of DCM even becomes reduced as compared with that observed in the absence of added coumarins as a donor.