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Photoluminescence of Eu3+ activated Ba2SnO4 under ultraviolet–vacuum ultraviolet excitation

Published online by Cambridge University Press:  01 July 2006

Hui Gao  and
Yuhua Wang
Hui Gao
Affiliation:
Department of Materials Science, Lanzhou University, Lanzhou 730000, People's Republic of China
Yuhua Wang*
Affiliation:
Department of Materials Science, Lanzhou University, Lanzhou 730000, People's Republic of China
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

A novel red emitting phosphor, Eu3+-doped Ba2SnO4, has been synthesized by solid-state reaction. Photoluminescence (PL) excitation spectrum of Ba2Sn0.925Eu0.075O4 shows the strongest broad band from 220 to 280 nm due to the charge transfer (CT) band of Eu3+–O2−, and the band centered at 180 nm could be caused by the CT band of Ba2+–O2−. The band (110–130 nm) could be attributed to SnO68− octahedron band absorption. It is found that under 254 nm excitation, Ba2Sn1−xEuxO4 (0.025 ≤ x ≤ 0.125) exhibits a strong emission at around 592 nm, and with the increase in Eu3+, the phosphors present orange to red luminescence due to the decreasing of the site symmetry of Eu3+. The maximum PL intensity has been obtained for 7.5 mol% concentration of Eu3+ in Ba2SnO4. On the other hand, under 147 nm excitation, the phosphors do not emit effectively because of inefficient absorption in vacuum ultraviolet (VUV) region.

Keywords

Luminescence
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 7 , July 2006 , pp. 1857 - 1861
Copyright
Copyright © Materials Research Society 2006

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