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Advances in Optical TechnologiesVolume 2012 2012, Article ID 814745, 6 pages

Research ArticleTokyo Institute of Technology, 4259 Nagatsuda, Midori-ku, Yokohama 226-8503, Japan

Received 24 March 2011; Accepted 18 May 2011

Academic Editor: Siu-Fung Yu

Copyright © 2012 Fumitaka Yoshimura et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The optical properties of afterglow nanoparticles were successfully improved by the addition of polyethylene glycol PEG to an afterglow colloidal solution. Afterglow nanoparticles—: , —were prepared by laser ablation in liquid. The quantum yields and the decay curves were measured by a fluorescence spectrophotometer. An increase in the amount of PEG added to the solution increased the quantum yield of the nanoparticles and improved the afterglow property in the initial portion of the decay curve. However, the afterglow property did not change after a substantial amount of time had passed. The afterglow nanoparticles were capped with PEG molecules, and surface defects of the nanoparticles were passivated, which decreased the optical properties.





Autor: Fumitaka Yoshimura, Mika Ishizaki, Fumihiro Wakai, Masahiko Hara, Osamu Odawara, and Hiroyuki Wada

Fuente: https://www.hindawi.com/



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