Influence of crystal structure on the luminescence of tantalates and niobates

Journal Article · Fri Jan 01 00:00:00 EST 1988 · J. Solid State Chem.; (United States)

DOI:https://doi.org/10.1016/0022-4596(88)90010-2· OSTI ID:7078480

Blasse, G

The luminescence of MgTa/sub 2/O/sub 6/ (trirutile structure) and ZnTa/sub 2/O/sub 6/ (tri-..cap alpha..-PbO/sub 2/ structure) are reported and discussed in connection with the luminescence of related compounds, especially the niobates with columbite structure. The maximum of the excitation band of the luminescence of the two tantalates is at 280 nm, a value lower in energy than that for the niobates. The emission band has its maximum at 500 nm (MgTa/sub 2/O/sub 6/) and 450 nm (ZnTa/sub 2/O/sub 6/). The quantum efficiency is low, reaching 15% (MgTa/sub 2/O/sub 6/) and 30% (ZnTa/sub 2/O/sub 6/) at 4.2 K. It is argued that the phenomena observed for these compounds indicate that the excitons, formed upon photoexcitation, are mobile, whereas in the columbite niobates they are localized due to self-trapping.

• Research Organization: Utrecht Univ. (Netherlands)
• OSTI ID: 7078480
• Journal Information: J. Solid State Chem.; (United States), Vol. 72:1
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
MAGNESIUM COMPOUNDS
CRYSTAL STRUCTURE
OPTICAL PROPERTIES
NIOBATES
TANTALATES
ZIRCONIUM COMPOUNDS
EMISSION SPECTROSCOPY
EXPERIMENTAL DATA
LUMINESCENCE
ALKALINE EARTH METAL COMPOUNDS
DATA
INFORMATION
NIOBIUM COMPOUNDS
NUMERICAL DATA
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
REFRACTORY METAL COMPOUNDS
SPECTROSCOPY
TANTALUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
360204* - Ceramics
Cermets
& Refractories- Physical Properties
360202 - Ceramics
Cermets
& Refractories- Structure & Phase Studies