The luminescence of ion-exchangeable defect pyrochlore KNbWO sub(6).H sub(2)O:xEu super(3+)

KNbWO sub(6).H sub(2)O:xEu super(3+) is prepared by ion exchange under hydrothermal conditions. Three K super(+) ions of KNbWO sub(6).H sub(2)O are exchanged for one Eu super(3+) ion and KNbWO sub(6).H sub(2)O:xEu super(3+) keeps its defect pyrochlore structure. Thermal analysis results indicate tha...

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Bibliographic Details
Published in:RSC advances 2014-06, Vol.4 (46), p.24142-24146
Main Authors: Han, Yong Nam, Jiao, Shihui, Xu, Man, Xu, Yaohua, Pang, Guangsheng, Feng, Shouhua
Format: Article
Language:English
Subjects:
Channels
Defects
Emission
Exchanging
Hydration
Ion exchangers
Luminescence
Pyrochlores
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Summary:KNbWO sub(6).H sub(2)O:xEu super(3+) is prepared by ion exchange under hydrothermal conditions. Three K super(+) ions of KNbWO sub(6).H sub(2)O are exchanged for one Eu super(3+) ion and KNbWO sub(6).H sub(2)O:xEu super(3+) keeps its defect pyrochlore structure. Thermal analysis results indicate that the Eu super(3+) ion incorporates into the channels of the defect pyrochlore structure in the form of the aqueous ion [Eu(H sub(2)O)n] super(3+). [Eu(H sub(2)O)n] super(3+) in the channel looses water at 450 degree C, which is much higher than that of KNbWO sub(6).H sub(2)O. The hydration of the Eu super(3+) ion in the pyrochlore structure has significant influence on the luminescence properties of KNbWO sub(6).H sub(2)O:xEu super(3+). The emission intensity increases 10 times when the as-prepared KNbWO sub(6).H sub(2)O:xEu super(3+) is annealed at 450 degree C for 2 h.
ISSN:2046-2069
DOI:10.1039/c4ra02722a