Synthesis, Luminescence and Energy Transfer of Dy3+ and Eu3+ Co-doped LiGd(MoO4)2 Single-Phase Phosphors

Series of Dy3+, Eu3+ co-doped LiGd (MoO4)(2) phosphors were prepared via sol-gel method, the samples were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and fluorescence spectrometer. The results show that the scheelite structured LiGd (MoO4)(2):Dy3+, Eu3+ fluorescent powder is irregular and the particle diameter is 1.8 mu m. Photoluminescence spectra show that the phosphors exhibit yellow and blue emission of Dy3+ and red emission of Eu3+ upon 354 nm near ultraviolet light excitation. The critical distance of Dy3+ and Eu3+ is calculated to be 1.383 nm. The mechanism of energy transfer from Dy3+ to Eu3+ is dipole-quadrupole interaction. By adjusting the concentration of Dy3+ and Eu3+, the phosphor can realize the warm-white-light emitting. Moreover, the relationship between the value of correlated color temperature and the rare earth ions (Dy3+, Eu3+) doped concentration was studied in detail.