Abstract
Eu-doped calcium aluminosilicate glass-ceramics have been successfully prepared from the initial calcium aluminosilicate glass, containing 50 wt% of silica, under heat-treatment. Structural and optical properties of glass and obtained glass-ceramics were investigated. Control of crystallization using X-ray diffraction and Raman spectroscopy allowed to identify two main crystalline phases: anorthite [CaAl2Si2O8] as the major phase and melilite [Ca2Mg0.75Al0.5Si1.75O7] as the minor phase. Luminescent properties were investigated by emission spectra, lifetime measurements and color point analysis. The Eu3+ ion emission was used as an environment probe in the initial glass and glass-ceramics. Additionally, the broad band emission due to 4f65 d1→4f7 showed that Eu2+ is incorporated into the crystalline phases after reduction of Eu3+ during annealing. This incorporation, increasing with time of heat-treatment, enhanced Eu2+ luminescence.
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