ISSN:
1662-8985
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Glasses in the composition range in mol% 35-50 ZnO – 10-15 Al2O3 – 40-55 SiO2 wereprepared, undoped and doped with 1 x 1019 and 1 x 1020 Sm3+ per cm3 glass as luminescent speciesfor 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 crystalphases: Zn2SiO4 (willemite), ZnAl2O4 (gahnite) and SiO2-mixed crystals. XRD, SEM and TEMmeasurements 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 thetime 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 around700°C, low coefficient of thermal expansion ~ 4 ppm/K, and high chemical stability
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.39-40.231.pdf
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