LAUSR

ABSTRACT The structural and optical behaviors of the undoped Gd2O3 and doeped with Er3+ and Yb3+singly as well as codoped sample were compared. Also the samples prepared by solid state reaction method and combustion synthesis method are also compared and obtained variation is discussed. Comparision of XRD data shows all the phosphors prepared by solid state reaction method have cubic phase whereas for solution combustion method have monoclinic phase. no change in the phase of the prepared phosphors have been observed due to presence of dopants. Photoluminescence behaviour of the phosphors was studied under 275 nm and 980 nm excitations. By changing the dopant the phosphors shows different photoluminescence behavior of downconversion as well as upconversion behavior. The CIE coordinates were compared for specific colour emitted by different phosphors for both 275 nm and 980 nm excitations. The CIE coordinates shows gradual variation in emitted colour as per dopent as well as the excitation wavelength.