Sol-gel processed Eu2+-doped alkaline earth aluminates

被引:74
作者
Aitasalo, T
Hölsä, J
Jungner, H
Lastusaari, M
Niittykoski, J [1 ]
机构
[1] Turku Univ, Dept Chem, Inorgan Chem Lab, FIN-20014 Turku, Finland
[2] Grad Sch Mat Res, Turku, Finland
[3] ENSCP, CNRS, UMR7574, Lab Chim Appl Etat Solide, F-75231 Paris 05, France
[4] Univ Helsinki, Dating Lab, FIN-00014 Helsinki, Finland
关键词
persistent luminescence; sol-gel; Eu2+; calcium aluminate;
D O I
10.1016/S0925-8388(02)00068-3
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Sol-gel preparation, structure and luminescence of Eu2+ doped calcium aluminate (CaAl2O4:Eu2+) was studied. The reaction threshold temperature was about 500degreesC, when using the sol-gel method. Unusual metastable hexagonal CaAl2O4:Eu2+ (lattice parameters a=8.74 and c=8.08 Angstrom), was obtained with the sol-gel method. The broad band UV excited luminescence of the hexagonal CaAl2O4:Eu2+ was observed at the blue region (lambda(max) = 448 nm) due to transitions from the 4f(6)5d(1) to the 47 configuration of the Eu2+-ion. The afterglow band position, shape and width were the same as those in the UV excited spectrum indicating the same luminescent Eu2+ centre. The thermoluminescence curve of the hexagonal modification contained several high temperature peaks, which explain the slow decay of the afterglow. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:76 / 78
页数:3
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