|
Z. Naturforsch. 2014,
69b, 159 – 164
doi:10.5560/ZNB.2014-3277
Preparation and Characterization of Transparent, Photoluminescent MgAl2O4:Eu2+ Ceramics
Fraunhofer IKTS, Institute of Ceramic Technologies and Systems, Winterbergstrasse 28, 01277 Dresden, Germany
Reprint requests to Dr. Katja Waetzig. Fax: 0049 351 2554305. E-mail:
katja.waetzig@ikts.fraunhofer.de
Received July 17, 2013 / published online February 17, 2014
The influence of 0.1 mol-% Eu2+ doping in a transparent MgAl2O4 ceramic on the optical properties has been investigated. The goal was to prepare first an Eu3+-doped spinel by a conventional sintering process for a transparent ceramic followed by a reductive densification step yielding an Eu2+-doped product. Commercially available spinel powder was doped with 0.1 mol-% europium using a nitrate salt and afterwards compacted into green bodies. In the following process the specimens were pre-sintered and post-densified using hot isostatic pressing (HIP) in an argon atmosphere. The transparency of the disks was measured optically using UV/Vis and fluorescence spectroscopy. After optimization of the sintering conditions the resulting Eu2+-doped spinel showed a transparency of
77.4 % and a conversion of the UV light with a wavelength of 260 nm into blue light with a wavelength of 450 nm.
Key words: Optical Ceramic, Transparent Ceramic, Spinel, Photoluminescence, Ceramic