Table of Contents Author Guidelines Submit a Manuscript
Journal of Nanomaterials
Volume 2010, Article ID 238792, 5 pages
http://dx.doi.org/10.1155/2010/238792
Research Article

The Influence of SiO2 Shell on Fluorescent Properties of LaF3:Nd3+ /SiO2 Core/Shell Nanoparticles

Cui Kai,1,2 Gao Chao,1 Peng Bo,1,3 and Wei Wei3

1State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Science (CAS), Xi'an Shaanxi 710119, China
2Graduate School of the Chinese Academy of Sciences, Beijing 100039, China
3Institute of Advanced Materials, Nanjing University of Posts and Telecommunications, Nanjing 210003, China

Received 1 July 2010; Accepted 1 October 2010

Academic Editor: Hongchen Chen Gu

Copyright © 2010 Cui Kai 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

Distinct effects of the Si shell on fluorescence properties of La :N /Si core/shell nanoparticles were demonstrated by annealling the nanoparticles at different temperatures. Emission spectra, excitation spectra, and decay curves of the nanoparticles were measured. A significant improvement of fluorescence intensity was observed for La :N /Si core/shell nanoparticles annealed at 900 . The phenomenon is ascribed to the change of environment of La :N core which is imposed by Si shell. And the change is confirmed by the excitation spectra. It provides a useful way to improve fluorescent intensity of the Si -coated La :N nanoparticles. The lifetime for nanoparticles annealed at 900 shows a slight decrease contrast with nanoparticles annealed at 400 and 600 . This is caused by the higher phonon energy of Si than that of La .