Luminescence studies of the rare earth ions-doped CaF2 and MgF2 films for wavelength conversion

The rare earth (RE) Eu, Yb ions-doped CaF2 and MgF2 films were prepared by the vacuum deposition and sol-gel methods. In the sol-gel method, the trifluoroacetic acid (TFA, CF3000H) was used as a source of fluorine. The RE doped CaF2 and MgF2 films were characterized by photoluminescence (PL), photol...

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Bibliographic Details
Published in:Journal of alloys and compounds 2006-02, Vol.408-412, p.838-841
Main Authors: Hong, Byung-Chul, Kawano, Katsuyasu
Format: Article
Language:English
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Summary:The rare earth (RE) Eu, Yb ions-doped CaF2 and MgF2 films were prepared by the vacuum deposition and sol-gel methods. In the sol-gel method, the trifluoroacetic acid (TFA, CF3000H) was used as a source of fluorine. The RE doped CaF2 and MgF2 films were characterized by photoluminescence (PL), photoluminescence excitation (PLE), the X-ray diffraction (XRD) and the atomic force microscopy (AFM) measurements. By the vacuum deposition, the strong luminescence due to the electric dipole allowed 4fn-4fn-15d1 transitions of Eu2+ and Yb2+ ions were observed similar with those of the crystalline bulks. The AFM surface images of sol-gel films revealed the formation of the nano-particles for alkaline earth fluorides.
ISSN:0925-8388
DOI:10.1016/j.jallcom.2005.01.133