Exploring luminescence quenching on lanthanide-doped nanoparticles through changing the spatial distribution of sensitizer and activator  

作　　者：Jiwei Li Yao Xie Renrui Sun Junxun Zhou Lining Sun 

机构地区：[1]Department of Chemistry,College of Sciences,Shanghai University,Shanghai 200444,China [2]Department of Physics,College of Sciences,Shanghai University,Shanghai 200444,China [3]School of Medicine,Shanghai University,Shanghai 200444,China

出　　处：《Nano Research》2024年第5期4517-4524,共8页纳米研究（英文版）

基　　金：support from the National Natural Science Foundation of China(No.22275120);the Science and Technology Commission of Shanghai Municipality(No.22520711600).

摘　　要：Luminescence quench is common in overdoped upconversion nanoparticles.Various methods have been proposed to counteract the adverse effects of concentration quenching on luminescence,but in upconversion nanoparticles that are highly doped with both sensitizers and activators,the factors that contribute to the diminishing of the emission cannot be summarized by a single cause.Herein,a core-shell design is used to spatially separate the sensitizer(Yb^(3+))and activator(Er^(3+))and to modulate the emission by changes in the distribution position as well as the concentration of the dopant ions in order to probe the factors affecting the luminescence.When the sensitizer ions are located in the core,the luminescence intensity of the nanoparticles is significantly weaker than that of the other distribution,which implies that the effect of sensitizer and activator on luminescence in the highly doped state has a different and more complex mechanism.The intensity of the emission is more affected by Yb^(3+)than Er^(3+),which includes not only the self-quenching of Yb^(3+),but also the dominance in the Yb^(3+)-Er^(3+)cross-relaxation.In this finding may provide new ideas for revealing the reasons for the diminished luminescence of highly doped upconversion nanoparticles and thus for enhancing luminescence.

关 键 词：upconversion luminescence lanthanide ion core-shell nanoparticles concentration quenching CROSS-RELAXATION 

分 类 号：O61[理学—无机化学]