Research Letters in Materials Science
Volume 2009 (2009), Article ID 475074, 4 pages
doi:10.1155/2009/475074
Research Letter

Effects of Particle Size and Type of Alumina on the Morphology and Photoluminescence Properties of Sr4Al14O25:Eu2+/Dy3+ Phosphor

Hom Nath Luitel, Takanori Watari, Toshio Torikai, and Mitsunori Yada

Department of Applied Chemistry, Faculty of Science and Engineering, Saga University, Honjo-1 Saga 840 8502, Japan

Received 18 November 2008; Accepted 28 January 2009

Academic Editor: Kevin Knowles

Copyright © 2009 Hom Nath Luitel 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

Sr4Al14O25:Eu2+/Dy3+ phosphor with high luminescence intensity and long afterglow duration was synthesized using 1.0 μm (α), 0.1 μm (α), and 0.05 μm (γ) particle sizes of Al2O3. SEM observation results showed that spike-like thin particles were formed when 0.05 μm γ-Al2O3 was used as raw material. Hexagonal thick particles were observed when 0.1 μm α-Al2O3 was used. But irregular, thin particles were observed while using 1 μm α-Al2O3. Photoluminescence measurements showed that both the initial intensity and the long persistency were much higher for the phosphor prepared using γ-Al2O3 of 0.05 μm particle size.