稀土(Gd^3+,La^3+)对Eu(p-MOBA)3phen/PMMA荧光及温敏特性的影响

Effects of Rare Earths(Gd^3+,La^3+)on Fluorescence and Temperature Sensitivity of Eu(p⁃MOBA)3phen/PMMA

以稀土氧化物(Eu2O3,Gd2O3,La2O3)、对甲氧基苯甲酸(p-MOBA)、菲咯啉(phen)为原料制备了不同稀土离子(Gd3+,La3+)掺杂的Eu(p-MOBA)3phen探针分子。将所合成的探针分子与甲基丙烯酸甲酯(MMA)混合,以过氧化苯甲酰(BPO)为引发剂引发聚合,制得不同稀土(Gd3+,La3+)掺杂的Eu(p-MOBA)3phen/PMMA温敏漆样品。利用扫描电镜、紫外-可见吸收光谱、红外光谱和荧光光谱对探针分子的形貌、结构、发光性能及温敏漆的荧光温度猝灭特性进行表征。红外光谱、紫外可见吸收光谱及扫描电镜能谱分析表明,Eu3+与配体p-MOBA、phen成功配位,且掺入的稀土离子(Gd3+,La3+)未改变Eu(p-MOBA)3phen结构,说明掺入的稀土离子(Gd3+,La3+)部分取代了Eu3+。荧光光谱表明,稀土离子(Gd3+,La3+)的掺入对Eu(p-MOBA)3phen的发光均具有增益作用,并且相应的温敏漆在50~100℃温度范围内都具有良好的荧光温度猝灭特性。而且相比于镧掺杂的Eu(p-MOBA)3phen/PMMA,钆掺杂的Eu(p-MOBA)3phen/PMMA具有更强的荧光发射和更高的测温灵敏度。可见,不同的稀土(Gd3+,La3+)对Eu(p-MOBA)3phen/PMMA的荧光及温敏特性影响是不同的。

The different rare earth(Gd3+, La3+) doped Eu( p-MOBA)3 phen probe molecules were prepared by using rare earth oxides(Eu2O3, Gd2O3, La2O3), p-methoxybenzoic acid( p-MOBA) and phenanthroline(phen). The different rare earth(Gd3+, La3+) doped Eu(p-MOBA)3 phen/PMMA temperature sensitive paints(TSPs) were fabricated by mix-ing the probe molecules with methyl methacrylate(MMA) and initiating polymerization with benzoyl peroxide(BPO). The morphology, structure, luminescence properties of the probe molecules, and the fluorescence tempera-ture quenching property of the TSPs were characterized by scanning electron microscopy, UV-Vis absorption spec-tra, infrared spectrometer and fluorescence spectra. The infrared spectrum, UV-Vis absorption spectra and scanning electron microscopy spectra show that Eu3+was successfully coordinated with the ligands p-MOBA and phen, and the structure of Eu(p-MOBA)3 phen was not changed when doped with rare earth ions(Gd3+, La3+), indicating that the doping of rare earth ions(Gd3+, La3+) partially replaced Eu3+. The fluorescence spectrum shows that the addition of rare earth ions(Gd3+, La3+) have a gain effect on the luminescence of Eu( p-MOBA)3 phen, and the corresponding TSPs have good fluorescence temperature quenching property in the temperature range of 50~100 ℃. Compared with La3+doped Eu(p-MOBA)3 phen/PMMA, Gd3+doped Eu( p-MOBA)3 phen/PMMA has stronger fluorescence emis-sion and higher temperature sensitivity. It can be seen that different rare earths(Gd3+, La3+) have different effects on the fluorescence and temperature sensitivity properties of Eu(p-MOBA)3 phen/PMMA.