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The luminescence of ion-exchangeable defect pyrochlore KNbWO 6 ·H 2 O:xEu 3
KNbWO 6 ·H 2 O: x Eu 3+ is prepared by ion exchange under hydrothermal conditions. Three K + ions of KNbWO 6 ·H 2 O are exchanged for one Eu 3+ ion and KNbWO 6 ·H 2 O: x Eu 3+ keeps its defect pyrochlore structure. Thermal analysis results indicate that the Eu 3+ ion incorporates into the channels o...
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| Published in: | RSC advances 2014, Vol.4 (46), p.24142-24146 |
|---|---|
| Main Authors: | , , , , , |
| Format: | Article |
| Language: | English |
| Citations: | Items that this one cites Items that cite this one |
| Online Access: | Get full text |
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| Summary: | KNbWO
6
·H
2
O:
x
Eu
3+
is prepared by ion exchange under hydrothermal conditions. Three K
+
ions of KNbWO
6
·H
2
O are exchanged for one Eu
3+
ion and KNbWO
6
·H
2
O:
x
Eu
3+
keeps its defect pyrochlore structure. Thermal analysis results indicate that the Eu
3+
ion incorporates into the channels of the defect pyrochlore structure in the form of the aqueous ion [Eu(H
2
O)
n
]
3+
. [Eu(H
2
O)
n
]
3+
in the channel looses water at 450 °C, which is much higher than that of KNbWO
6
·H
2
O. The hydration of the Eu
3+
ion in the pyrochlore structure has significant influence on the luminescence properties of KNbWO
6
·H
2
O:
x
Eu
3+
. The emission intensity increases 10 times when the as-prepared KNbWO
6
·H
2
O:
x
Eu
3+
is annealed at 450 °C for 2 h. |
|---|---|
| ISSN: | 2046-2069 2046-2069 |
| DOI: | 10.1039/C4RA02722A |