Eu, Dy codoped Y2Zr2O7 powders with white light luminescence

Eu, Dy codoped Y2Zr2O7 crystalline powders have been prepared by a simple sol-gel-combustion method. The lumincescence excitation and emission spectra of the products were measured, and the CIE chromaticity was introduced to characterize the color of the phosphor. It was found that the emission color of the Eu, Dy codoped Y2Zr2O7 powders depends on the doping concentration of Eu, Dy ions and the excitation wavelength. White light emission has been observed for Y2Zr2O7: 1.5%Eu 3+ , 2.0%Dy 3+ under 350nm excitation, for which the calculated chromaticity coordinate is (0.37, 0.32).