Photoluminescent Layered Y(III) and Tb(III) Silicates Doped with Ce(III)

The synthesis and structural characterization of new layered rare-earth silicates K3[M1 - a Ce a Si3O8(OH)2], M = Y3+, Tb3+, a ≪ 1 (AV-22 materials), have been reported. These materials combine the properties of layered silicates, such as intercalation chemistry, and photoluminescence and may find a...

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Bibliographic Details
Published in:The journal of physical chemistry. B 2006-08, Vol.110 (31), p.15312-15316
Main Authors: Kostova, Mariya H, Sá Ferreira, Rute A, Ananias, Duarte, Carlos, Luís D, Rocha, João
Format: Article
Language:English
Subjects:
Cerium - chemistry
Luminescence
Photochemistry
Silicates - chemistry
Terbium - chemistry
Time Factors
Yttrium - chemistry
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Summary:The synthesis and structural characterization of new layered rare-earth silicates K3[M1 - a Ce a Si3O8(OH)2], M = Y3+, Tb3+, a ≪ 1 (AV-22 materials), have been reported. These materials combine the properties of layered silicates, such as intercalation chemistry, and photoluminescence and may find applications in new types of sensor devices. For mixed Tb/Ce-AV-22, evidence has been found for the energy transfer from the large Ce3+ 4f 1 → 5d broad band to the sharp Tb3+ 4f 8 lines. This energy transfer allows the fine-tuning of the color emission in the blue-green region of the chromaticity diagram. Upon Ce3+ excitation (342 nm), the radiance of Tb/Ce-AV-22 is approximately 2 times higher than that measured under direct Tb3+ excitation, which reinforces the existence of effective room-temperature Ce3+-to-Tb3+ energy transfer.
ISSN:1520-6106
1520-5207
DOI:10.1021/jp062758w