6533b862fe1ef96bd12c606b
RESEARCH PRODUCT
Crystallization and upconversion luminescence of distorted fluorite nanocrystals in Ba2+ containing oxyfluoride glass ceramics
Anatolijs SarakovskisGuna Kriekesubject
Materials scienceDopingMineralogy02 engineering and technology010402 general chemistry021001 nanoscience & nanotechnology01 natural sciencesFluoritePhoton upconversion0104 chemical scienceslaw.inventionTetragonal crystal systemchemistry.chemical_compoundCrystallographyNanocrystalchemistrylawMaterials ChemistryCeramics and CompositesCrystallization0210 nano-technologyLuminescenceFluoridedescription
Abstract In this study novel Er 3+ -doped transparent glass ceramics were prepared from melt-quenched glasses with general composition of Na 2 O-NaF-BaF 2 -YF 3 -Al 2 O 3 -SiO 2 . The phase composition of the annealed glass ceramics strongly depends on the BaF 2 content in glass matrix. Crystallization of β-NaYF 4 , cubic fluorite type, tetragonal nanocrystals and rhombohedral Ba 4 Y 3 F 17 was observed. An introduction of BaF 2 in the glass matrix suppresses the crystallization of β-NaYF 4 , promotes the formation of Ba 2+ containing fluoride phases and reduces the cross-relaxation between Er 3+ ions in fluoride crystals. Small rate of the nonradiative processes and low local symmetry of rhombohedrally disordered Ba 4 Y 3 F 17 enables an efficient upconversion luminescence surpassing that of the glass ceramics containing β-NaYF 4 nanocrystals.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2016-06-01 | Journal of the European Ceramic Society |