Luminescence properties of sol-gel derived Sr2(Ce1-xSnx)O4 blue phosphors
Journal
Journal of Alloys and Compounds
Journal Volume
489
Journal Issue
2
Pages
445-450
Date Issued
2010
Author(s)
Abstract
Monophasic Sr2(Ce1-xSnx)O4 phosphors (x = 0-0.07) were prepared via the sol-gel process. A broad excitation band ascribed to the Ce4+-O2- transition was observed in the range of 200-450 nm. With doping Sn4+ ions into the host, the intensity of the low-energy peak enhanced remarkably due to a decrease in crystal field. The intensity ratio of the low-energy peak to the high-energy peak increased with the amount of Sn4+ ions doped. Moreover, the red shift of the excitation peaks was observed due to an increase in the bond length of Ce-O. Upon excitation at around 346 nm, the intensity of the blue emission peak peaking at 483 nm was enhanced with doping Sn4+ ions. The doping of tin ions was found to significantly improve the luminescence characteristics of the prepared phosphors when they were excited under UV light. ? 2009 Elsevier B.V. All rights reserved.
Subjects
LED
Luminescence
Sn4+ ion
Sol-gel
Sr2CeO4
Type
journal article