Comparative study of Ca4Y6(SiO4)6O:a phosphors prepared by sol-gel and dry methods (A = Pb2+, +Eu3+, Tb3+, +Dy3+)
- 1 January 1995
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of Materials Chemistry
- Vol. 5 (4) , 603-606
- https://doi.org/10.1039/jm9950500603
Abstract
Ca4Y6(SiO4)6O:A (A = Pb2+, Eu3+, Tb3+, Dy3+) phosphors have been prepared by two methods: the sol-gel method and the conventional dry method. The crystallization processes and the luminescence characteristics of the phosphors were studied. The sol-gel method features low-temperature formation of the phosphor, leading to successful preparation of Pb2+-activated phosphors which could not be prepared by the dry method at high temperature. The (4f)8–(4f)7(5d)1 absorption band of Tb3+ and the charge-transfer (CT) band of Eu3+ have higher energies and narrower half-widths in the sol-gel-derived phosphors than in the phosphors prepared by the dry method, respectively. The Tb3+ and Dy3+ ions show stronger emission in the former than in the latter. Both the yellow-to-blue intensity ratio (Y: B) of Dy3+ and the red-to-orange intensity ratio (R : O) of Eu3+ in the sol-gel-derived phosphors are smaller than those for the phosphors derived by the dry method.Keywords
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