Broadband NIR photoluminescence from Ni2+-doped nanocrystalline Ba–Al titanate glass ceramics (original) (raw)
* Corresponding authors
a Institute of Glass and Ceramics, Department of Materials Science, University of Erlangen-Nuremberg, Martensstrasse 5, Erlangen, Germany
E-mail: lothar.wondraczek@ww.uni-erlangen.de
Fax: +49 (0)9131 28311
Tel: +49 (0)9131 85 27553
b Center for Nanoanalysis and Electron Microscopy (CENEM), Department of Materials Science, University of Erlangen-Nuremberg, Germany
c Institute of Optical Communication Materials & State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou, China
Abstract
Nanocrystalline Ba–Al titanate precipitates from supercooled TiO2–BaO–SiO2–Al2O3 melts by catalyzed volume nucleation in the presence of Ni2+, forming a BaAl2Ti6O16 hollandite-type lattice. Ni2+-species are incorporated into the crystalline environment in octahedral coordination. Hollandite formation is accompanied by precipitation of tetrahedrally distorted BaTiO3 as a secondary crystal phase, where crystal species and habitus can be clearly distinguished by dark-field transmission electron microscopy. Resulting photoluminescence due to spin-allowed relaxation of 3T2g(3F) to 3A2g(3F) in VINi2+ occurs from three distinct emission centers. It spans the spectral range of 1.0 to 1.6 μm and exhibits a lifetime of about 60 μs, which suggests applications in tunable lasers and broadband optical amplifiers. Besides red and IR laser excitation, NIR photoemission can be excited with conventional near UV light sources, i.e. in the spectral range of 350–420 nm. Decay kinetics as well as position and shape of the emission band can be adjusted by dopant concentration and synthesis conditions.
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Article information
DOI
https://doi.org/10.1039/C1JM14292E
Article type
Paper
Submitted
31 Aug 2011
Accepted
21 Nov 2011
First published
21 Dec 2011
Download Citation
J. Mater. Chem., 2012,22, 2582-2588
Permissions
Broadband NIR photoluminescence from Ni2+-doped nanocrystalline Ba–Al titanate glass ceramics
G. Gao, S. Reibstein, E. Spiecker, M. Peng and L. Wondraczek,J. Mater. Chem., 2012, 22, 2582DOI: 10.1039/C1JM14292E
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