Hydrothermal Preparation and Luminescence Properties of NaGd (MoO4)2 : Dy3+, Eu3+ White-light Phosphors

Dy, Eu co-doped NaGd(MoO4)(2) white-light phosphors were prepared by a simple glutamic acid-assisted hydrothermal method. X-Ray diffraction( XRD) patterns show that the samples are tetragonal phase NaGd(MoO4)(2). Scanning electron microscopy(SEM) images show that the as-prepared particles have an octagonal shape with each side length of about 2 mu m. In the fluorescence spectra of NaGd(MoO4)(2) Dy,Eu, it is found that the emission intensity of Eu3+ increased and the emission intensity of Dy3+ decreased with increasing the amount of Eu3+ and maintaining the concentration of Dy3+. The energy transmission of Dy3+-Eu3+ is observed. From Commission Internationale de L' Eclairage (CIE) chromaticity diagram, it is noted that white light can be achieved in NaGd(MoO4)(2) : 4% Dy3+, 0. 9% Eu3+ phosphor, the CIE color coordinates (0. 338, 0. 281) are near to the standard color coordinates(0. 33, 0. 33).