Thermally stimulated luminescence of undoped and Ce3+-doped Gd2SiO5 and (Lu,Gd)2SiO5 single crystals
V. Bondar, L. Grigorjeva, T. Kärner, O. Sidletskiy, K. Smits, S. Zazubovich, A. Zolotarjovs Thermally stimulated luminescence (TSL) characteristics (TSL glow curves and TSL spectra) are investigated in the 4-520 K temperature range for the X-ray irradiated at 4 K, 8 K, or 80 K single crystals of gadolinium and lutetium-gadolinium oxyorthosilicates. The nominally undoped […]
Studies of radiation defects in cerium, europium and terbium activated oxyfluoride glasses and glass ceramics
E. Elsts , U. Rogulis, K. Bulindzs, K. Smits, A. Zolotarjovs, L. Trinkler, K. Kundzins Terbium, cerium and europium activated oxyfluoride glasses and glass ceramics have been studied by thermally stimulated luminescence (TSL) and optical absorption techniques after the X-ray irradiation. A creation of colour centres in oxyfluoride glass matrix and TSL peaks depending on […]
Luminescence of Phosphorus Containing Oxide Materials: Crystalline SiO2-P and 3P2O5·7SiO2; CaO·P2O5; SrO·P2O5 glasses
A. N.Trukhin, K. Smits, J. Jansons, D. Berzins, G. Chikvaidze, D.L.Griscom ABSTRACT. Luminescence of phosphate glasses such as CaO·P2O5 and SrO·P2O5 is compared with that of phosphorus doped crystalline -quartz and phosphosilicate glass with content 3P2O5·7SiO2. Water & OH groups are found by IR spectra in these materials. The spectrum of luminescence contains many bands […]
Characteristic and sinterability of alumina-zirconia-yttria nanoparticles prepared by different chemical methods
GRABIS Janis, JANKOVICA Dzidra, STEINS Ints, SMITS Krisjanis,and SIPOLA Inta Abstract. The characteristics and sinterability of the Al2O3-ZrO2(Y2O3) nanoparticles produced by simple and effective microwave and molten salts methods and processed by using spark plasma sintering were studied and compared. The crystalline powders with the specific surface area in the range of 72–108 m2/g and […]
Luminescence properties of zirconia nanocrystals prepared by solar physical vapor deposition
Krisjanis Smits , Larisa Grigorjeva , Donats Millers , Karlis Kundzins , Reinis Ignatans , Janis Grabis , Claude Monty Zirconia nanocrystals have attracted considerable interest as biolabels, which can be used as probes for medical imaging and biosensor applications. However, zirconia particle agglomeration forms amajor limitation to its use for biolabeling. In this backdrop, for […]
The role of Nb in intensity increase of Er ion upconversion luminescence in zirconia
K. Smits, A. Sarakovskis, L. Grigorjeva, D. Millers, and J. Grabis It is found that Nb co-doping increases the luminescence and upconversion luminescence intensity in rare earth doped zirconia. Er and Yb-doped nanocrystalline samples with or without Nb co-doping were prepared by sol-gel method and thermally annealed to check for the impact of phase transition […]
The role of Nb in intensity increase of Er ion upconversion luminescence in zirconia
K. Smits, A. Sarakovskis, L. Grigorjeva, D. Millers, J. Grabis It is found that Nb co-doping increases the luminescence and upconversion luminescence intensity in rare earth doped zirconia. Er and Yb-doped nanocrystalline samples with or without Nb co-doping were prepared by sol-gel method and thermally annealed to check for the impact of phase transition on […]
Luminescence of rutile structured crystalline silicon dioxide (stishovite)
A.N.Trukhin , K.Smits, G.Chikvaidze, T.I.Dyuzheva, L.M.Lityagina Luminescence spectrum of synthetic mono-crystalline stishovite comprises as low blue band at 400 nm (3.1 eV) and a fast UV band at 260 nm (4.7 eV), as well as some bands in near-infrared range of spectra.The NIR luminescence of stishovite crystal, excited with lasers 532 nm, 248 nm and […]