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RESEARCH PRODUCT
Time-Resolved Luminescence of Nanocrystalline Inorganic Complex Oxides
V. PankratovD. MillersL. GrigorjevaW. LojkovskiA. KareivaR.t. Williamssubject
HistoryMaterials scienceDopingchemistry.chemical_elementMineralogyNanoparticlePhotochemistryNanoceramicNanocrystalline materialComputer Science ApplicationsEducationCeriumchemistryNanocrystalddc:530LuminescenceSingle crystaldescription
Two types of complex nanosized oxides – cerium doped Y3Al5O12 (YAG) and CaWO4– have been studied by means of time-resolved luminescence spectroscopy. Comparative study of time-resolve luminescence characteristics of cerium doped YAG single crystal, nanopowders and nanoceramic as well as for CaWO4 macro- and nanocrystals has been done. Two components in the decay kinetic of Ce3+ related emission in YAG nanocrystals were detected and it was suggested that a different energy transfer rate to volume and surface Ce3+ ions takes place. It is shown that the segregation of Ce3+ ions near nanoparticles surface and/or dislocation lines plays a crucial role in degradation of light yield of cerium related luminescence in YAG nanocrystals. Time-resolved properties of sol-gel synthesized CaWO4 nanocrystals depends strongly on the synthesis rout. It was shown that shallow traps have a strong influence on the luminescence decay times of nanosized CaWO4.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2007-12-01 |