Effects of water molecules on luminescence in europium and terbium coordination polymers with p-fluorobenzoic acid as ligand  

作　　者：Xiaoqi Zhao Puyan Hao Yami Ling Mengzhen Jia Rui Zhu Jiawen Liu Qiang Xu Jianhong Zhou 

机构地区：[1]Collaborative Innovation Center of Rare-Earth Optical Functional Materials and Devices Development,Baoji Key Laboratory of Micro-Nano Optoelectronics and Terahertz Technology,School of Physics and Opto-Electronic Technology,Baoji University of Arts and Sciences,Baoji,721016,China

出　　处：《Journal of Rare Earths》2024年第7期1258-1264,I0003,共8页稀土学报（英文版）

基　　金：Project supported by the Natural Science Foundation of Shaanxi Province(2021JQ-799);Key Scientific Research Plan of Shaanxi Provincial Department of Education(22JC001)。

摘　　要：Our previous experimental observations show that the crystal structure of lanthanide luminescent complexes synthesized in aqueous solution usually contains a large number of coordination water molecules or free water molecules.In order to probe the influence of water molecules on luminescent processes of lanthanide complexes,the photoluminescence properties of Ln-FBA(Ln=Eu and Tb,FBA=p-fluorobenzoic acid)coordination polymers at different ambient temperatures,in different solvents and aqueous DMSO solutions with different volume concentrations were systematically investigated.The experiment results show that the presence of water molecules can promote the energy transfer from FBA ligand to Ln3+,at the same time,can cause luminescent non-radiation quenching of lanthanide ions.In addition,the variation of emission intensity ratio of 615 nm/591 nm peaks of Eu^(3+)with increasing the volume concentration of H_(2)O can be potentially used for the quantitatively detection of water traces in organic solvents.In order to suppress the non-radiation quenching caused by the water molecules,Ln-FBA(Ln=Eu and Tb)coordination polymers were embedded into the PVP matrix to prepare Ln-FBA@PVP hybrid materials.The photoluminescence investigation indicates that PVP can not only block the quenching effect of water molecules on luminescence,but also effectively sensitize Eu^(3+)and Tb^(3+)luminescence.These experimental conclusions are useful for probing the influence of water molecules on luminescent processes of lanthanide complexes,quantitatively detecting water traces in organic solvents and enhancing the photoluminescence intensity in lanthanide complexes.

关 键 词：Lanthanide complexes Photoluminescence Luminescent quenching Rare earths 

分 类 号：O641.4[理学—物理化学]