Dresden 2020 – wissenschaftliches Programm
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CPP 4.5: Vortrag
Montag, 16. März 2020, 10:45–11:00, ZEU 255
Controlled crystallisation of luminescent borate-based glasses — •Marc Bürger1, A. Charlotte Rimbach1, and Stefan Schweizer1,2 — 1Faculty of Electrical Engineering, South Westphalia University of Applied Sciences, Lübecker Ring 2, 59494 Soest — 2Fraunhofer Application Center for Inorganic Phosphors, Branch Lab of Fraunhofer Institute for Microstructure of Materials and Systems IMWS, Lübecker Ring 2, 59494 Soest
Luminescent borate glasses and glass ceramics offer a broad spectrum of optical applications. Here, the optical properties of the glass as well as the glass ceramic strongly depend on their composition and the production process. In this work, two different glass systems and their crystallization processes therein are analysed: (i) Lithium borate glass comprised of Li2O-Al2O3-B2O3 and (ii) barium borate glass with BaO-B2O3. For optical activation, the lanthanide ion Dy3+ is added in the form of Dy2O3 to enable for a bright green-yellowish luminescence. To initiate the crystallization process in the glass, the samples are thermally-processed at a temperature above the glass transition temperature. The number and size as well as the phase of the grown crystallites depend significantly on annealing temperature and time as well as the heating rate. The crystallite growth is investigated and analysed in detail by differential scanning calorimetry and in situ x-ray diffractometry. In addition, the samples are optically characterized for transmittance, reflectance and scattering.