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

Influence of Plasmonic Effect on the Upconversion Emission Characteristics of NaYF4 Hexagonal Microrods.

Author information

1
Department of Applied Physics , The Hong Kong Polytechnic University , Hong Kong , China.
2
College of Materials Science and Engineering , Kunming University of Science and Technology , Kunming Yunnan China.
3
University Research Facility in Materials Characterization and Device Fabrication , The Hong Kong Polytechnic University , Hong Kong , China.
4
Institute of Materials Research and Engineering, A*STAR , 2 Fusionopolis Way, Innovis , Singapore 138634 , Singapore.
5
Shenzhen Research Institute , The Hong Kong Polytechnic University , Shenzhen , P. R. China.

Abstract

The influence of plasmonic effect on the upconversion emission characteristics of Yb3+-Er3+-Tm3+ tridoped β-NaYF4 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.

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