1. 宁波大学 信息科学与工程学院, 浙江 宁波 315211
2. 南京大学 固体微结构国家实验室, 江苏 南京 210093
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解凯贺, 张晓伟, 束俊鹏等. Tb<sup>3+</sup>离子与SnO<sub>2</sub>纳米晶体共掺杂SiO<sub>2</sub>薄膜荧光增强[J]. 发光学报, 2018,39(8): 1100-1106
XIE Kai-he, ZHANG Xiao-wei, SHU Jun-peng etc. Enhanced Photoluminescence of Tb<sup>3+</sup> Ions andSnO<sub>2</sub> Nanocrystals Codoped Silica Thin Films[J]. Chinese Journal of Luminescence, 2018,39(8): 1100-1106
解凯贺, 张晓伟, 束俊鹏等. Tb<sup>3+</sup>离子与SnO<sub>2</sub>纳米晶体共掺杂SiO<sub>2</sub>薄膜荧光增强[J]. 发光学报, 2018,39(8): 1100-1106 DOI: 10.3788/fgxb20183908.1100.
XIE Kai-he, ZHANG Xiao-wei, SHU Jun-peng etc. Enhanced Photoluminescence of Tb<sup>3+</sup> Ions andSnO<sub>2</sub> Nanocrystals Codoped Silica Thin Films[J]. Chinese Journal of Luminescence, 2018,39(8): 1100-1106 DOI: 10.3788/fgxb20183908.1100.
为了提高Tb,3+,离子在硅基薄膜中的吸收截面与光发射效率,本文通过在硅基薄膜中引入具有更大吸收截面的SnO,2,纳米晶体,利用共振能量转移机制,大幅提高了Tb,3+,离子的光发射效率。首先,利用限制性晶化原理,采用基于旋涂技术的溶胶凝胶法制备了Tb,3+,离子与SnO,2,纳米晶体共掺杂非晶SiO,2,薄膜。然后,通过选择最佳掺杂浓度的SnO,2,纳米晶体作为敏化剂,Tb,3+,离子掺杂SiO,2,薄膜在541 nm处的特征荧光发射强度增大了2个数量级。荧光激发谱与瞬态荧光寿命谱测试结果表明,Tb,3+,离子与SnO,2,纳米晶体之间存在着有效的非辐射复合能量传递过程,1 000℃高温退火后,部分Tb,3+,离子进入纳米晶体内部,导致共振能量转移效率大幅提高。以上研究表明:SnO,2,纳米晶体是一种潜在的Tb,3+,离子敏化剂,可有效提高稀土Tb,3+,离子掺杂SiO,2,薄膜的光发射效率。
In order to improve the absorption cross section and increase the photoluminescence efficiency of Tb,3+, ions doped silica thin film, SnO,2, nanocrystals with larger absorption cross sections were introduced into the silica thin films, and the greatly enhanced photoluminescence intensity was obtained because of resonant energy transfer mechanism. Firstly, Tb,3+, and SnO,2, nanocrystals codoped silica thin films were fabricated by use of sol-gel and spin coating methods according to the restrictive crystallization principle. The characteristic photoluminescence emission intensity of Tb,3+, ions at 541 nm was enhanced by two orders of magnitude for the film sensitized by SnO,2, nanocrystals with the optimized Sn,4+, concentration. The photoluminescence excitation spectra indicate the non-radiative energy transfer process that takes place between Tb,3+, ions and surface of SnO,2, nanocrystals. Meanwhile, the photoluminescence intensity decay curves suggest the partial incorporation of Tb,3+, ions into the SnO,2, sites, which explains the greatly improving energy transfer efficiency. All these results indicate that SnO,2, nanocrystals could be benefit for enhanced photoluminescence of Tb,3+, ions doped silica thin film as a potential sensitizer.
薄膜纳米晶体稀土离子溶胶凝胶制备光致发光
thin filmnanocrystalrare-earth ionsol-gel preparationphotoluminescence
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