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Luminescence and structural characterization of transparent nanostructured Eu3+-doped LaF3–SiO2 glass–ceramics prepared by sol–gel method

✍ Scribed by A.C. Yanes; J. Del-Castillo; J. Méndez-Ramos; V.D. Rodríguez; M.E. Torres; J. Arbiol

Publisher
Elsevier Science
Year
2007
Tongue
English
Weight
481 KB
Volume
29
Category
Article
ISSN
0925-3467

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✦ Synopsis

Glass-ceramics with composition of 89.9SiO 2 -10LaF 3 -0.1EuF 3 (mol%) were prepared by sol-gel method. LaF 3 nanocrystals, precipitated by heat-treatments, were identified by X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM). Besides the well-known red emission of Eu 3+ ions, higher energy emissions coming from upper-lying levels 5 D 1 and 5 D 2 can be observed at room temperature due to the very low phonon energies of the LaF 3 matrix. Moreover, from site selective excitation and emission spectra in the temperature range from 13 to 300 K, it is concluded that the fraction of Eu 3+ ions partitioned into LaF 3 nanocrystals, substituting La 3+ ions, is comparable to the one staying in the SiO 2 glassy phase.

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