Terbium doped yttrium oxide was prepared with the microwave hydrothermal method. The Y2O3：Tb nanomaterial crystal- lized as needle-like grains. Bright luminescence in the green region was observed. Significant lumine...Terbium doped yttrium oxide was prepared with the microwave hydrothermal method. The Y2O3：Tb nanomaterial crystal- lized as needle-like grains. Bright luminescence in the green region was observed. Significant luminescence intensity increase was obtained after thermal treatment. Reduction of terbium ions was observed after heating in the air atmosphere. Tb4＋ ions were found to be stabilized by crystal impurities. Hydroxyl species were found to have impact on vacancies elimination. The terbium ions were used as optical and magnetic indicator of the material properties.展开更多
Two-step synthesis of Y2O3:Eu nanostructures was performed.It includes microwave driven hydrothermal and calcination stages.Performed route results in crystallization of Y4O(OH)g(NO3):Eu crystals initially,then Y2O3:E...Two-step synthesis of Y2O3:Eu nanostructures was performed.It includes microwave driven hydrothermal and calcination stages.Performed route results in crystallization of Y4O(OH)g(NO3):Eu crystals initially,then Y2O3:Eu crystals after calcination.Arranged Eu contents in relation to overall cation quantity were set to 2 mol%,10 mol%and 20 mol%.Varying europium concentrations influence habit of obtained Y4O(OH)g(NO3):Eu crystals from needle-like to plate-like and as a result,also shapes of final Y2O3:Eu nanostructures.Additionally,certain amount of Eu2+ions was detected in as-grown material using laser spectroscopy and decay kinetics measurements.Obtained material was calcined at 1200°C in the air,which results in oxidation of Eu2+ions and crystallization of small number of cubic EU2 O3 nanocrystals.Characterization of obtained materials was performed using XRD,SEM,TEM,EDX,CL,Raman and photoluminescence spectroscopy.展开更多
基金Project supported by European Union within European Regional Development Fund,through Grant Innovative Economy(POIG.01.01.02-00-008/08)
文摘Terbium doped yttrium oxide was prepared with the microwave hydrothermal method. The Y2O3：Tb nanomaterial crystal- lized as needle-like grains. Bright luminescence in the green region was observed. Significant luminescence intensity increase was obtained after thermal treatment. Reduction of terbium ions was observed after heating in the air atmosphere. Tb4＋ ions were found to be stabilized by crystal impurities. Hydroxyl species were found to have impact on vacancies elimination. The terbium ions were used as optical and magnetic indicator of the material properties.
基金Project supported by National Science Centre(2012/05/E/NZ4/02994,2012/06/A/ST7/00398)
文摘Two-step synthesis of Y2O3:Eu nanostructures was performed.It includes microwave driven hydrothermal and calcination stages.Performed route results in crystallization of Y4O(OH)g(NO3):Eu crystals initially,then Y2O3:Eu crystals after calcination.Arranged Eu contents in relation to overall cation quantity were set to 2 mol%,10 mol%and 20 mol%.Varying europium concentrations influence habit of obtained Y4O(OH)g(NO3):Eu crystals from needle-like to plate-like and as a result,also shapes of final Y2O3:Eu nanostructures.Additionally,certain amount of Eu2+ions was detected in as-grown material using laser spectroscopy and decay kinetics measurements.Obtained material was calcined at 1200°C in the air,which results in oxidation of Eu2+ions and crystallization of small number of cubic EU2 O3 nanocrystals.Characterization of obtained materials was performed using XRD,SEM,TEM,EDX,CL,Raman and photoluminescence spectroscopy.
