370256 Plasmon-Enhanced Upconversion Emission of Hexagonal Er3+, Yb3+ Co-Doped Lutetium Oxyfluoride Using Silver Nanoparticles

Thursday, November 20, 2014: 5:23 PM
International 8 (Marriott Marquis Atlanta)
Zhaofeng Wang1, Xiaoming Ji2, Lemer Maxime1, Huidan Zeng2 and Luyi Sun1, (1)Department of Chemical & Biomolecular Engineering and Polymer Program, Institute of Materials Science, University of Connecticut, Storrs, CT, (2)Key Laboratory for Ultrafine Materials of Ministry of Education, East China University of Science and Technology, Shanghai, China

In this work, Ag@LuOF: Er3+, Yb3+ micro-hexagonal composites were prepared. X-ray diffraction, energy dispersive spectroscopy, and high-resolution transmission electron microscopy results confirm that Ag nanoparticles with size around 30 nm have been uniformly immobilized on the surface of LuOF: Er3+, Yb3+ hexagons. Upconversion spectra under near-infrared laser excitation suggest that the emission intensity of LuOF: Er3+, Yb3+ is significantly enhanced by combining with Ag nanoparticles. Possible mechanisms for the plasmon-enhancement on upconversion have been proposed based on the analysis of absorption spectra and decay lifetime curves. Because of the near-infrared excitation, high upconversion intensity, and pure red emission, the Ag@LuOF: Er3+, Yb3+ composites exhibit promising applications in solid-state lighting, biological labeling, and imaging.

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