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Proceedings Paper

Upconversion, size analysis, and fiber filling of NaYF4: Ho3+, Yb3+ crystals and nanocolloids
Author(s): Darayas Patel; Ashley Lewis; Donald Wright; Maucus Velentine; Danielle Lewis; Ruben Valentine; Sergey Sarkisov
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Paper Abstract

Nano-colloids and nano-crystals doped with ions of rare-earth elements have recently attracted a lot of attention in the scientific community. This attention is due to unique physical, chemical and optical properties attributed to nanometer size of the particles. They have great potential of being used in applications spanning from new types of lasers, especially blue and UV ones, phosphorous display monitors, optical communications, and fluorescence imaging. In this paper we investigate the near-infrared upconversion luminescence in bulk crystals and nanocolloid filled photonic crystal fiber with ytterbium and holmium co-doped NaYF4 phosphor. The phosphor is prepared by using simple co-precipitation synthetic method. The initially prepared phosphor has very week upconversion fluorescence. The fluorescence significantly increased after the phosphor was annealed at a temperature of 600 °C. Nanocolloids of this phosphor were obtained using 1-propanol as solvent and they were utilized as laser filling medium in photonic crystal fibers. Under 980 nm diode laser excitation very strong upconversion signals were obtained for ytterbium and holmium co-doped phosphor at 541 nm, 646 nm and 751 nm. Pump power emissions, laser ablation and size analysis of the particles was conducted to understand the upconversion mechanisms. The particle sizes of the nanocolloids were analyzed using Atomic Force Microscope and Malvern Zetasizer instrument. The reported nanocolloids are good candidates for fluorescent biosensing applications and also as a new laser filling medium in fiber laser.

Paper Details

Date Published: 7 March 2014
PDF: 6 pages
Proc. SPIE 8982, Optical Components and Materials XI, 898221 (7 March 2014); doi: 10.1117/12.2039897
Show Author Affiliations
Darayas Patel, Oakwood Univ. (United States)
Ashley Lewis, Oakwood Univ. (United States)
Donald Wright, Oakwood Univ. (United States)
Maucus Velentine, Oakwood Univ. (United States)
Danielle Lewis, Oakwood Univ. (United States)
Ruben Valentine, Oakwood Univ. (United States)
Sergey Sarkisov, SSS Optical Technologies, LLC (United States)

Published in SPIE Proceedings Vol. 8982:
Optical Components and Materials XI
Michel J. F. Digonnet; Shibin Jiang, Editor(s)

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