Luminescent ZnO-Al₂O₃-SiO₂ Glasses and Glass Ceramics

Abstract:

Glasses in the composition range in mol% 35-50 ZnO – 10-15 Al2O3 – 40-55 SiO2 were prepared, undoped and doped with 1 x 1019 and 1 x 1020 Sm3+ per cm3 glass as luminescent species for the visible region, especially for blue and red emission. Phase separation occurs in glass samples with high SiO2 content. SiO2-rich droplets in a Zn2+- Al3+- enriched matrix were formed. Sm3+ ions prefer the Zn2+-Al3+-rich glass matrix. By thermal treatment glass samples were transformed into glass ceramics with the main crystal phases: Zn2SiO4 (willemite), ZnAl2O4 (gahnite) and SiO2-mixed crystals. XRD, SEM and TEM measurements were carried out. The luminescent Sm3+ ions are concentrated in the glass matrix. Photoluminescence excitation and emission spectra were recorded in the UV-VIS-region and the time resolved emission behavior was measured by excitation with a N2-laser at 337 nm. The glasses and glass ceramics have interesting chemical and physical properties, high Tg around 700°C, low coefficient of thermal expansion ~ 4 ppm/K, and high chemical stability.

• Periodical: Advanced Materials Research (Volumes 39-40)
• Pages: 231-236
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.39-40.231
• Online since: April 2008
• Authors: Doris Ehrt, H.T. Vu, A. Herrmann, Günter Völksch
• Keywords: Ceramic, Optical Property, Photoluminescence (PL), Samarium, Thermal Property, Zinc Silicate

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