Ag@SiO_(2)核壳纳米颗粒对Eu-PMMA薄膜的发光增强效应  

Luminescence enhancement effect of Ag@SiO_(2) coreshell nanoparticles on Eu-PMMA films

作　　者：龙江迷 陈晓波[1] 赵国营 李永良[1] 郭敬华[1] 王杰亮[1] 李崧[1] 刘泉林[3] LONG Jiang-mi;CHEN Xiao-bo;ZHAO Guo-ying;LI Yong-liang;GUO Jing-hua;WANG Jie-liang;LI Song;LIU Quan-lin(Applied Optics Beijing Area Major Laboratory,Department of Physics,Beijing Normal University,Beijing 100875,China;School of Materials Science and Engineering,Shanghai Institute of Technology,Shanghai 200235,China;School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]北京师范大学应用光学北京重点实验室与物理学系,北京100875 [2]上海应用技术大学材料科学与工程学院,上海200235 [3]北京科技大学材料科学与工程学院,北京100083

出　　处：《中国光学》2021年第6期1341-1347,共7页Chinese Optics

基　　金：国家自然科学基金项目(No.51972020,No.51472028);中央高校基本科研业务费专项资金(No.017TZ01)。

摘　　要：为了提高稀土离子的发光性能,在稀土发光材料中引入了贵金属纳米颗粒。金属等离子体共振可以产生局域电场,作用于稀土离子的发光过程,能达到发光增强的效果。Ag@SiO_(2)核壳结构纳米颗粒可以有效控制金属Ag与稀土离子之间的距离,既能达到等离子体共振增强的效果,又可以避免与发光中心距离过近时产生非辐射能量传递导致的荧光淬灭。用滴铸法先将不同浓度的Ag@SiO_(2)纳米颗粒滴在石英片上,再将Eu(dbm)_(3)phen:PMMA:二氯甲烷混合溶液旋涂制备得到Eu-PMMA复合薄膜。对样品进行形貌表征和发光测量,发现Ag@SiO_(2)纳米颗粒的引入使薄膜的发光强度得到增强,测量的激发光谱的最大增强因子为2.50倍,发射光谱的最大增强因子为2.15倍。同时荧光寿命测量结果显示,含有Ag@SiO_(2)纳米颗粒的薄膜样品的发光寿命也得到延长。在稀土发光材料中引入Ag@SiO_(2)纳米颗粒展现了良好的发光增强效果,且实验方法可操作性强,具有良好的应用潜力。In order to improve the luminescent properties of rare earth ions,precious metal nanoparticles were doped into rare earth luminescent materials.Metal plasma resonance can produce local electric field,which acts on the luminescence process of rare earth ions,and can achieve the luminescence enhancement.Ag@SiO_(2) core-shell nanoparticles can effectively control the distance between metal Ag and rare earth ions,which can not only enhance the plasmonic resonance effect,but also avoid the fluorescence quenching caused by non-radiation energy transfer when they are too close to the emission center.Firstly,the Ag@SiO_(2) nanoparticles with different concentrations were dropped on the quartz wafers by drop-casting method.Then,the Eu(dbm)_(3)Phen:PMMA:dichloromethane mixed solution was spin-coated to prepare the Eu-PMMA com-posite film.The morphology characterization and luminescence measurement of the samples showed that the luminescence intensity of the film doped with Ag@SiO_(2) nanoparticles was enhanced,and the maximum en-hancement factor of the measured excitation spectrum was 2.50 times,and the maximum enhancement factor of the emission spectrum was 2.15 times.The results of the fluorescence lifetime measurement of the sample indicated that the luminescence lifetime of the film containing Ag@SiO_(2) nanoparticles was also prolonged.The doping of Ag@SiO_(2) nanoparticles in the rare earth luminescent materials shows a good enhancement,and the experimental method is highly operable.It is a promising method to enhance the luminescent intens-ity of rare earth luminescent materials.

关 键 词：稀土离子发光 等离子体增强 Ag@SiO_(2)核壳结构 聚甲基丙烯酸甲酯 

分 类 号：O433.1[机械工程—光学工程]