J. Phys. Chem. B,103 (17), 3361 -3365, 1999.
Copyright © 1999 American Chemical Society

Sonochemical Preparation and Characterization of Eu2O3 and Tb2O3 Doped in and Coated on Silica and Alumina Nanoparticles

A. Patra, E. Sominska, S. Ramesh, Yu. Koltypin, Z. Zhong, H. Minti, R. Reisfeld, and A. Gedanken

Department of Inorganic and Analytical Chemistry, The Hebrew University of Jerusalem, 91940 Israel, and Department of Chemistry, Bar-Ilan University, Ramat-Gan 52900, Israel

Received: December 17, 1998

In Final Form: February 24, 1999


Submicron size spheres of silica and alumina prepared by well-known methods were coated sonochemically by nanoparticles of oxides of europium and terbium using the same concentration of ions. We have also used sonochemistry to prepare nanoparticles of silica and alumina doped by the same rare-earth ions for comparison. The highest luminescence intensities were observed for europium and terbium doped in nanoparticles of alumina of dimension 20-30 nm. The intensities are comparative or higher than in commercial phosphors.