Particle and Aerosol Research Vol. 2, No. 1, March 2006 |
ISSN : 1738-8716 (Print) ISSN : 2287-8130 (Online) |
Preparation of LaPO4 :Re/LaPO4 (Re=Er, Yb) core/shell nanoparticles and NIR-photoluminescence properties
¿ÀÀç¼®∙¼®»óÀÏ∙°ûÁßÇù∙Á¤ÇϱÕ*
Abstracts
Some inorganic materials doped with Er have been used in optical amplifier at 1,540 nm due to the transition of
4I13/2 to 4I15/2 state of Er3+ ion. In recent, lots of studies on Er-doped nanoscale materials have carried out for
applications such as EDWA. However, the nanoscale particles have a very small size and large surface area, so that
they can easily adsorb O-H groups on their surface. Especially, the adsorption of O-H groups to Er3+ ions being on
the surfaces of nanoparticles leads to quenching of the 1,540 nm emission. In this study, LaPO4 : Er/LaPO4
core/shell nanoparticles were synthesized in solution system using a high-boiling coordinating solvent and their
properties were investigated through various spectroscopic techniques. The core/shell nanoparticles were identified
to take a single phase of monazite structure and to have about 8 nm of particles size with narrow size distribution.
In addition, it was confirmed by the FT-IR analysis that the surfaces of nanoparticles were coordinated with the
solvent molecules and hydroxyl group. In the NIR emission spectrum of LaPO4 : Er/LaPO4 core/shell nanoparticles,
both the increase of peak intensity at the emission spectra and the extension of lifetime were clearly observed. On
the other hand, the longest lifetime in the synthesized core/shell nanoparticles was obtained at 1% activator
concentration.
File
4-Er(27-34).pdf
Download