1. Influence of Ag nanoparticles on luminescent performance of SiO2:Tb3+ nanomaterials
- Author
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Zhang, Dekai, Hu, Xiaoyun, Ji, Ruonan, Zhan, Suchang, Gao, Jianhua, Yan, Zhiyun, Liu, Enzhou, Fan, Jun, and Hou, Xun
- Subjects
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SILVER nanoparticles , *SILICA , *TERBIUM , *RARE earth ions , *DOPED semiconductors , *PHOTOLUMINESCENCE , *SCANNING electron microscopy , *MICROSTRUCTURE - Abstract
Abstract: Tb3+ single-doped SiO2 (SiO2:Tb3+) and Tb3+, Ag co-doped SiO2 (SiO2:Tb3+–Ag) nanostructured luminescent materials were prepared by a modified Stöber method. Their microstructure and optical property were investigated using scanning electron microscopy, ultraviolet visible absorption and photoluminescence spectrophotometry. Results show that the samples are composed of well-dispersed near-spherical particles with a diameter about 50nm, the highest fluorescence intensity is obtained when the doping concentration of Tb3+ is 4.86mol%, the corresponding internal quantum efficiency is 13.6% and the external quantum efficiency is 8.2%. The experimental results indicate that Ag nanoparticles can greatly enhance the light absorption at 226nm and the light emission at 543nm of SiO2:Tb3+–Ag, and the fluorescence lifetime reduces with increasing Ag concentration in SiO2:Tb3+–Ag. Additionally, the present results indicate that fluorescence enhancement is attributed to the local field enhancement and the increased radiative decay rates induced by Ag nanoparticles. [Copyright &y& Elsevier]
- Published
- 2012
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