Luminescence and energy transfer in the columbite structure
The luminescence properties of undoped and Eu/sup 3 +/- and Dy/sup 3 +/doped CdNb/sub 2/O/sub 6/ and CaNb/sub 2/O/sub 6/ are reported and discussed in connection with the luminescence of niobates and tungstates with wolframite and columbite structure. It is shown that these structures lead in principle to highly efficient luminescent materials. However, disorder between the metal ions reduces the efficiency considerably. In CdNb/sub 2/O/sub 6/ the niobate excitation energy is more mobile than in CaNb/sub 2/O/sub 6/. This has important consequences for the rare-earth activated materials. At 300 K the amount of rare-earth emission from the CdNb/sub 2/O/sub 6/-based samples is high. This is due to energy migration in the host lattice and efficient transfer to the activator (R /SUB c/ approx. = 7A).
- OSTI ID:
- 6086054
- Journal Information:
- Mater. Res. Bull.; (United States), Vol. 20:9
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CADMIUM COMPOUNDS
CRYSTAL LATTICES
ENERGY TRANSFER
ION IMPLANTATION
LUMINESCENCE
CALCIUM COMPOUNDS
NIOBATES
ACTIVATION ENERGY
CRYSTAL DOPING
CRYSTALLOGRAPHY
DYSPROSIUM IONS
EUROPIUM IONS
MEDIUM TEMPERATURE
MINERALS
TUNGSTATES
ALKALINE EARTH METAL COMPOUNDS
CHARGED PARTICLES
CRYSTAL STRUCTURE
ENERGY
IONS
NIOBIUM COMPOUNDS
OXYGEN COMPOUNDS
REFRACTORY METAL COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
360202* - Ceramics
Cermets
& Refractories- Structure & Phase Studies