Preparation of Y2O3:Eu3+, Tb3+ nanopowders with tunable luminescence by ammonium bicarbonate co-precipitation method

Y2O3: Eu3+, Tb3+ nanopowders were prepared by co-precipitation method with NH4HCO3 as precipitant. The nanopowders with different calcined temperatures and Eu3+/Tb3+ doped ratio were characterized by X-ray Diffraction (XRD), scanning electron microscopy (SEM) and fluorescence spectrophotometer. The results showed that the nanopowders calcined at 1100 degrees C for 2 h had a uniform distribution, high purity and good dispersibility. The particle size was in the range of 60-80 nm. The excitation spectra of Eu3+/Tb3+ co-doped phosphors were wide. The phosphors could emit the green light at the peak of 543 nm and the red light at the peak of 611 nm simultaneously under 276 nm or 300 nm excited. Because of the energy transfer between Tb3+ and Eu3+, the 543 nm emission of Tb3+ ion was weakened while the 611 nm emission of Eu3+ enhanced. The emissive colors of Y2O3:Eu3+, Tb3+ nanopowders could be adjusted from yellow-green to orange-red by changing the Eu3+/Tb3+ doping ratio.