间甲基和邻氯苯甲酸稀土配合物发光性能的研究

本文研究了间甲基苯甲酸稀土配合物REL3(RE=Eu,Tb;HL=m-CH2C6H4CO2H)和邻氯苯甲酸稀土配合物REL3·H2O(RE=EU·Tb;HL=ClC6H4CO2H)的荧光性能,测量了配合物的激发和荧光光谱及其寿命,讨论了晶体结构对能级匹配、能量传递等光谱性质的影响.

LUMINESCENCE OF RARE EARTH COMPLEXES WITH m-METHYL AND o-CHLOROBENZOIC ACIDS

The luminescence properties of rare earth complexes with m-methylbenzoic acid REL3 (RE=Eu, Tb; HL=m-CH3C6H4CO2H) and with o-chlorobenzoic acid REL3 H2O RE=Eu, Tb; HL=o-ClC6H4CO2H) are reported in this paper. The influence of the coordination environment on energy transfer; the luminescence intensity and life time has been discussed.For Tb ions when the ligand in the complexes is changed, the position of the maximum of the excitation wavelength is displaced lightly, the emission of Tb-mm is much stronger than that of Tb--Cl, and Tb-mm has a longer decay. The luminescence phenomenon of Eu-mm and Eu-Cl, however, is contrary, both Eu-mm and Eu-Cl showstronger 5D0→7F2 transition of Eu3+, but Eu-Cl has a stronger emission intensity and longer lifetime. The reason for these results is believed to be due to the coordination environment of the complexes.Although there exist O-H bonds with high vibrational energy in Eu-Cl, the formation of hydrogen bonds may reduce the vibrational energy by increasing the rigidity of the complex. So the energy transmission can occur efficiently from ligand to Eu3+ and the emission of Eu-Cl is stronger than that of Eu-mm. The deactivation via vibronic coupling is, however, less efficient for Tb3+, and the emission of Tb-mm is stronger than that of Tb-Cl.