Host-Sensitized Luminescence of Dy[sup 3+] in Nanocrystalline β-Ga[sub 2]O[sub 3] Prepared by a Pechini-Type Sol-Gel Process

Nanocrystalline undoped and -doped were prepared through a Pechini-type sol-gel process. All the samples began to crystallize at 600°C, and the crystallinity increased with the increase of annealing temperatures until 1000°C. Field emission-scanning electron microscopy study revealed that the sample is composed of aggregated particles with sizes ranging from 40 to 80 nm and spherical morphology. Undoped sample shows a strong blue emission peaking at 438 nm. The mainly occupied the octahedral sites in shows its characteristic emissions in the blue 460-505 nm and yellow 570-0600 nm regions due to an efficient energy transfer from the host lattices. The optimum concentration for the luminescence is determined to be 2 atom % of in host. © 2004 The Electrochemical Society. All rights reserved.