Combustion synthesis and luminescent properties of white light emitting Gd2O3:Dy3+ single phase nanophosphor

A series of Dy3+ doped Gd2O3 nanophosphors was synthesized by combustion method using urea. The crystallite sizes of the samples are found to be in the range of 9-16 nm. Photoluminescence emission spectra of the doped samples show two intense peaks at 487 nm and 575 nm corresponding to F-4(9/2)-H-6(15/2) and F-4(9/2)-H-6(13/2) transitions, respectively. The intensity of the emission spectra increases with the increase of dopant concentration upto 1at% of Dy3+ due to the energy transfer from Gd3+ of the host to Dy3+ and decreases due to concentration quenching. The electric dipole-dipole interaction mechanism is the main mechanism for concentration quenching. The decay curves are well fitted with bi exponential equation. The CIE co-ordinates and CCT values of the doped samples are found to be closed to that of white light.