Eu3+配合物掺杂聚合物的制备与光谱性能研究

以噻吩甲酰三氟丙酮(2-thenoyltrifluoroacetone , TTFA), 六氟乙酰丙酮(hexafluoro- acetylacetone, HFA)和甲基联苯甲酰(dibenzoylmethide, DBM) 分别为配体合成了Eu3+的三种β-二酮类配合物Eu(TTFA)3、Eu(HFA)3和 Eu(DBM)3,以及掺杂这三种配合物的聚合物（聚甲基丙烯酸甲酯,PMMA）,并用分光光度计对它们的荧光光谱特性进行了分析研究.结果表明,三种配合物中Eu(TTFA)3荧光强度最强,并分析了其原因,发现能级匹配、配体取代基、配体结构对称性等均对配合物发光效率有重要的影响.通过比对,证明了TTFA是Eu3+发红色荧光的优良配体.进一步研究还发现,Eu(TTFA)3掺杂PMMA中稀土离子的荧光强度和荧光寿命均随掺杂浓度（质量分数为0.08～0.5）的增加而增大.

Fabrication and Fluorescence Properties of Eu(TTFA)3-doped PMMA

Eu3+ chelates with thenoyltrifluoroacetylacetone(TTFA),Hexafluoroacetylacetone(HFA) and dibenzoyl-methide (DBM) as the ligands and PMMA doped with these chelates were synthesized,respectively. Fluorescence properties of the chelates Eu (TTFA)3,Eu (HFA)3,Eu (DBM)3 in benzene solution and in PMMA matrix were investigated. It was found that the fluorescence intensity of Eu (TTFA)3 was the topmost. The effect factors on the fluorescence intensity of complexes were analyzed. It was testified that TTFA was a good ligand of Eu3+ for red fluorescence emission. Finally,the dependence of Eu (TTFA)3 doping concentrations (0.08 wt.% ～ 0.5wt.%) on the fluorescence intensity and the fluorescence lifetimes were investigated. The results showed that the fluorescence intensity and the lifetimes increased within the doping concentrations investigated. The fluorescence lifetimes were between 280～400 μs. Such fluorescing PMMA might have extensive prospect of applications in optical devices,such as polymer optical fibers,lasers,amplifiers and waveguides.