Shape control over microwave hydrothermally grown Y2O3:Eu by europium concentration adjustment

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.

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）9（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）9（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℃in the air,which results in oxidation of Eu2+ ions and crystallization of small number of cubic Eu2O3 nanocrystals.Characterization of obtained materials was performed using XRD,SEM,TEM,EDX,CL,Raman and photoluminescence spectroscopy.