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Babu, P.,Jang, Kyoung Hyuk,Kim, Eun Sik,Shi, Liang,Vijaya, R.,Laví,n, V.,Jayasankar, C.K.,Seo, Hyo Jin Elsevier 2010 Journal of non-crystalline solids Vol.356 No.4
<P><B>Abstract</B></P><P>Dysprosium-doped oxyfluoride glasses and nanocrystalline glass–ceramics have been synthesized and studied by X-ray diffraction, transmission electron microscope, optical spectroscopy and time-resolved decay curves measurements. From the absorption spectra, Judd–Ofelt intensity parameters have been obtained and are used to predict radiative properties for the excited states of Dy<SUP>3+</SUP> ions. From the visible emission spectra, yellow to blue intensity ratios have been calculated and their relative variations have been discussed based on the concentration of Dy<SUP>3+</SUP> ions and the heat treatment conditions used to prepare the glass–ceramics. Luminescence decay curves of the <SUP>4</SUP>F<SUB>9/2</SUB> emitting level are found to be single exponential for 0.01mol% Dy<SUP>3+</SUP>-doped glass and non-exponential for the remaining samples. The nature of energy transfer processes between Dy<SUP>3+</SUP> ions, responsible for the non-exponential behavior of the decay curves, has been analyzed in the frame work of the Inokuti–Hirayama model. Lifetimes of the <SUP>4</SUP>F<SUB>9/2</SUB> level are found to decrease with the concentration of Dy<SUP>3+</SUP> ions as well as with the time of heat treatment.</P>
Babu, P,Jang, Kyoung Hyuk,Rao, Ch Srinivasa,Shi, Liang,Jayasankar, C K,Laví,n, Ví,ctor,Seo, Hyo Jin Optical Society of America 2011 Optics express Vol.19 No.3
<P>The radiative emission properties of the Dy<sup>3+</sup> ions in an oxyfluoride glass and glass-ceramics have been studied for the generation of white light. The x-ray diffraction pattern of the glass-ceramics shows the formation of CaF<sub>2</sub> fluorite-type nanocrystals in the glass matrix after a suitable thermal treatment of the precursor glass, whereas time-resolved optical measurements show the incorporation of the Dy<sup>3+</sup> ions in the CaF<sub>2</sub> nanocrystals. Intense white light has been observed when the samples are excited with 451 nm laser light. From the visible emission spectra, yellow to blue intensity ratios and the chromaticity color coordinates have been determined. All the color coordinates are found to lie in the white light region of the chromaticity color diagram.</P>