Dresden 2011 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
DF: Fachverband Dielektrische Festkörper
DF 11: Glasses I (Joint Session of DY, DF, CPP)
DF 11.10: Vortrag
Mittwoch, 16. März 2011, 12:30–12:45, KÖN Farb
Optical and structural properties of fluorozirconate-based glass ceramics doped with divalent and trivalent europium. — •Christian Passlick1, Bastian Henke1,2, Jacqueline Anne Johnson3, and Stefan Schweizer1,2 — 1Centre for Innovation Competence SiLi-nano®, Martin Luther University of Halle-Wittenberg, Karl-Freiherr-von-Fritsch-Str. 3, 06120 Halle (Saale) — 2Fraunhofer Center for Silicon Photovoltaics, Walter-Hülse-Str. 1, 06120 Halle (Saale) — 3Department of Materials Science and Engineering, University of Tennessee Space Institute, Tullahoma, TN 37388, USA
Eu-doped fluorozirconate-based glass ceramics can be used for x-ray detection in medical diagnostics as well as for down-converting top layers in photovoltaics. A modified ZBLAN composition consisting of a mixture of Zr, Ba, La, Al, and Na fluorides was additionally doped with chlorine ions to initiate the formation of BaCl2 nanocrystals upon thermal treatment of the as-poured glasses. During annealing some of the Eu2+ ions are incorporated into the nanocrystals enabling a strong blue fluorescence upon ultraviolet excitation or x-ray irradiation. In this work, focus is put on the amount of divalent and trivalent Eu fluoride and chloride additives since it is known that the expensive Eu2+ can be produced by melting the cheaper Eu3+ raw material. Influences of the different Eu oxidation states on the BaCl2 crystallization and the optical response of the glass ceramics are presented.