纳米Ag颗粒表面等离子激元对上转换材料光致发光性能影响的研究

本文采用共烧结工艺将纳米Ag颗粒引入Yb³⁺, Er³⁺共掺的NaYF₄上转换材料中, 利用X射线衍射及扫描电子显微镜技术对制备的NaYF₄材料进行结构特性和表面形貌的表征, 通过吸收谱及荧光光谱测试技术对NaYF₄材料光吸收及光发射特性进行表征. 通过对纳米Ag颗粒引入量的优化, 获得了Yb³⁺, Er³⁺共掺的NaYF₄上转换材料荧光发射峰的增强, 300—800 nm全光谱范围内增益达28%, 在544 nm处获得最大增益55%, 具有显著的荧光增强效果. 同时分析了不同数量纳米Ag颗粒的引入对NaYF₄材料吸收谱及光致发光特性影响, 指出了表面等离子激元的光猝灭及共振吸收增强作用机理.

Effect of surface plasmon polariton of Ag nanoparticles on the photoluminescence property of up-conversion materials

Silver nanoparticles are added into Yb³⁺ and Er³⁺ co-doped NaYF₄ up-conversion materials using co-sintering process.Changes in diffraction intensity and surface morphology are inspected by X-ray diffraction and scanning electron microscope measurement, respectively.The optical absorption and Photoluminescence spectra are measured using UV/visible spectrophotometer and photoluminescence measurements.By optimizing the quantity of Ag nanoparticles,we obtain obvious enhancements of the photoluminescence intensities of Yb³⁺ and Er³⁺ co-doped NaYF₄ materials,which shows a 28%enhancement in 300—800 nm wavelength range and a 55%enhancement at 544 nm.Different mechanisms are proposed for light quenching and surface plasmon enhanced absorption with Ag nanoparticles adjustment.