钇(Ⅲ)、铽(Ⅲ)、铒(Ⅲ)对氨基苯甲酸配合物共掺杂二氧化硅的光声光谱研究  

Photoacoustic Study of Y^(3+),Tb^(3+) and Er^(3+) Complexes with Aminobenzoic Acid Co-doped Silica Samples

作　　者：杨跃涛[1] 汪海燕[1] 刘晓俊[1] 张淑仪[1] 

机构地区：[1]南京大学近代声学教育部重点实验室,声学研究所,南京210093

出　　处：《高等学校化学学报》2010年第4期657-661,共5页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:10874088;10874087)资助

摘　　要：合成了Tb(p-ABA)3·H2O和Ln(p-ABA)3·H2O(p-ABA:对氨基苯甲酸,Ln:Y或Er)配合物共掺杂的SiO2样品.荧光光谱测定结果表明,Y(p-ABA)3·H2O的引入增强了样品中Tb3+离子的特征发光,而Er(p-ABA)3·H2O的引入使Tb3+的发光减弱.光声光谱结果表明,与Tb3+配合物单掺的样品相比,Tb3+和Y3+配合物共掺样品的光声强度降低;而Tb3+和Er3+配合物共掺的样品则情况相反.实验测定了共掺杂样品的相对量子发光效率和发光寿命,从无辐射跃迁和辐射跃迁的角度提出共发光效应可能的机制.结合对室温下陈化干燥样品的分析发现,只有经适当的热处理过程才能在SiO2凝胶中形成具有多核结构的稀土配合物.Lanthanide complexes Tb（p-ABA） 3 ·H2O and Ln（p-ABA） 3 ·H2 O（p-ABA=p-aminobenzoic acid;Ln=Y or Er） co-doped silica samples were prepared.It was found that the characteristic emissions of Tb 3＋ in the silica samples increase with the addition of Y（p-ABA） 3 ·H2O,while the reverse is true with the addition of Er（p-ABA） 3 ·H2O.Compared with only Tb 3＋ complex doped silica sample,the photoacoustic intensity in the region of the ligand absorption decreases for Tb 3＋ and Y 3＋ complexes co-doped sample,and increases for Tb 3＋ and Er 3＋ complexes co-doped sample.The relative luminescence quantum yields and lifetime for the co-doped samples were determined,and the possible mechanism for the co-luminescence phenomena was interpreted from two aspects：radiative and nonradiative processes.Lanthanide complexes doped wet silica gels,which have undergone aging and drying at room temperature only,were also studied.The results indicate that p-ABA does not coordinate with the lanthanide ions in the silica gels without a suitable heat treatment.The co-luminescence effect found in this work will contribute the better design of new type of luminescence materials.

关 键 词：稀土配合物 光声光谱 硅胶 共发光效应 

分 类 号：O614[理学—无机化学] O657.3[理学—化学]