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Optical properties of CaF2:Eu3+ nanocrystals embedded in transparent oxyfluoride glass ceramic

S. POLOSAN1,* , C. E. SECU1

Affiliation

  1. National Institute of Materials Physics, Bucharest-Magurele 077125, ROMANIA

Abstract

Transparent oxyfluoride glass ceramic in the system SiO2–Al2O3–CaF2–EuF2 containing CaF2:Eu3+ nanocrystals were produced by annealing of the initial glasses slightly above the CaF2 phase crystallisation peak. The relative good transparency of these materials was due to the small, 65 nm, nucleated CaF2 nanocrystallites. X-ray diffraction data have shown an increase of the cell parameters for CaF2:Eu3+ compared with CaF2 which was attributed to the substitution of Ca2+ ions with Eu3+ ions in the CaF2 nanoparticles. Optical investigations using UV–VIS-NIR absorption and luminescence spectroscopy have shown an increase of the splitting of the Eu3+-ion associated luminescences and small shifts of the Eu3+- ion characteristic IR absorption peaks. These effects have been attributed to the Eu3+ environment evolving from the glass to the crystalline-like one..

Keywords

Glass ceramic, CaF2 nanocrystals, Optical absorption, Luminescence.

Submitted at: Feb. 20, 2008
Accepted at: July 10, 2008

Citation

S. POLOSAN, C. E. SECU, Optical properties of CaF2:Eu3+ nanocrystals embedded in transparent oxyfluoride glass ceramic, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 8, pp. 2134-2137 (2008)