等离子体效应对六方相 NaYF4 微米棒上转换发光特性的影响。

Influence of Plasmonic Effect on the Upconversion Emission Characteristics of NaYF Hexagonal Microrods.

机构信息

Department of Applied Physics , The Hong Kong Polytechnic University , Hong Kong , China.

College of Materials Science and Engineering , Kunming University of Science and Technology , Kunming Yunnan China.

出版信息

Inorg Chem. 2018 Jul 16;57(14):8200-8204. doi: 10.1021/acs.inorgchem.8b00690. Epub 2018 Jun 25.

DOI:10.1021/acs.inorgchem.8b00690

PMID:29939734

Abstract

The influence of plasmonic effect on the upconversion emission characteristics of Yb-Er-Tm tridoped β-NaYF hexagonal microrods is studied. Upconversion spontaneous emission can be improved by 10 times if the microrod is deposited on an Ag-coated substrate. The enhancement is also dependent on the emission wavelength and the polarization of the excitation source. Furthermore, upconversion lasing is supported by the geometry of the microrods via the formation of whispering gallery modes. The corresponding excitation threshold can also be reduced by 50% through the influence of plasmonic effect, the coupling between the whispering gallery modes and the surface plasmonic resonance modes.

摘要

研究了等离子体效应对 Yb-Er-Tm 三掺杂β-NaYF 六方微米棒上转换发射特性的影响。如果将微米棒沉积在镀银基底上，上转换自发发射可以提高 10 倍。增强效果还取决于发射波长和激发光源的偏振。此外，通过 whispering gallery 模式的形成，微米棒的几何形状支持上转换激光。通过等离子体效应的影响， whispering gallery 模式和表面等离子体共振模式之间的耦合，也可以将相应的激发阈值降低 50%。