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Ternane, R.
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article
Luminescent properties of Eu-doped calcium aluminosilicate glass-ceramics: A potential tunable luminophore
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 Eu<sup>3+</sup> ion emission was used as an environment probe in the initial glass and glass-ceramics. Additionally, the broad band emission due to 4f<sup>6</sup>5 d<sup>1</sup>→4f<sup>7</sup> showed that Eu<sup>2+</sup> is incorporated into the crystalline phases after reduction of Eu<sup>3+</sup> during annealing. This incorporation, increasing with time of heat-treatment, enhanced Eu<sup>2+</sup> luminescence.