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Synthesis, photoluminescence and thermal properties of laponite-X (X = Eu, Tb) phosphors  

Kim, Pyo-Ra (Department of Chemistry and Institute of Basic Science, DanKook University)
Son, Dong-Min (Department of Chemistry and Institute of Basic Science, DanKook University)
Lee, Han-Na (Department of Chemistry and Institute of Basic Science, DanKook University)
Kim, You-Hyuk (Department of Chemistry and Institute of Basic Science, DanKook University)
Publication Information
Journal of the Korean Crystal Growth and Crystal Technology / v.19, no.4, 2009 , pp. 196-201 More about this Journal
Abstract
In order to give emission functionality for laponite the laponite-X (x = Eu, Tb) phosphors were prepared by calcination of cryogels which were prepared through Na ion exchange reaction with Eu and Tb ions. Thermal stability and emission properties of new laponite-X (X = Eu, Tb) phosphors were investigated by X-ray diffractormeter and UV/VUV spectrofluorometer. The phosphors were stable around up to $600^{\circ}C$ and new crystalline phases were observed at $700^{\circ}C$. Red and green emissions of phosphors under UV/VUV excitation were also identified at $300^{\circ}C$ and $500^{\circ}C$ as emission peaks of $Eu^{3+}$ and $Tb^{3+}$, respectively.
Keywords
Laponite; $Eu^{3+}$ and $Tb^{3+}$; Thermal stability; Emission spectrum; XRD;
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