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Research Letters in Materials Science
Volume 2007, Article ID 23643, 4 pages
http://dx.doi.org/10.1155/2007/23643
Research Letter

Photoluminescent Spectra of Nd3+ Codoped CaAl2O4:Eu2+ Blue Phosphor

1Energy Materials Research Centre, Korea Research Institute of Chemical Technology, P.O. Box 107, Yuseong, Daejeon 305-600, South Korea
2Laser Materials Development and Devices Division, Raja Ramanna Centre for Advanced Technology, Indore 452 013, India

Received 10 July 2007; Accepted 5 September 2007

Academic Editor: Pavel Lejcek

Copyright © 2007 Hojin Ryu and K. S. Bartwal. 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

Phosphor material CaAl2O4:Eu2+ codoped with varying concentrations of Nd3+ was prepared by solid-state reaction method. Prepared materials with 1 mol% Eu2+ and Nd3+ (0.5 to 5 mol%) show high brightness and long persistent luminescence. The phase and crystallinity of the synthesized materials were investigated by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Photoluminescence excitation and emission spectra were taken to investigate the luminescence characteristics. Broadband UV excited luminescence of the CaAl2O4:Eu2+, Nd3+ was observed in the blue region (λmax = 440 nm) due to transitions from 4f65d1 to the 4f7 configuration of the Eu2+ ion. The Nd3+ ion doping in the phosphor generates deep traps which result in long afterglow phosphorescence.