NDLI: Broadband NIR photoluminescence from Ni<sup>2+</sup>-doped nanocrystalline Ba

Content Provider	Royal Society of Chemistry (RSC)
Author	Spiecker, Erdmann Peng, Mingying Reibstein, Sindy Gao, Guojun Wondraczek, Lothar
Copyright Year	2012
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.
Starting Page	2582
Ending Page	2588
Page Count	7
File Format	HTM / HTML PDF
ISSN	09599428
Volume Number	22
Issue Number	6
Journal	Journal of Materials Chemistry
DOI	10.1039/c1jm14292e
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	NIR Supercooling Crystal growth Crystal structure Hollandite Barium titanate Morphology (biology) Transmission electron microscopy Photoluminescence Micrometre Laser Photoelectric effect Dopant
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry

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