Abstract: A series of Dy³⁺ doped Y₂M_gTiO₆ phosphors (YMT∶Dy³⁺) were synthesized by sol-gel method. The morphology, crystal structure and luminescence properties of these phosphors were characterized and analyzed by XRD, SEM and fluorescence analyzer. The results show that YMT∶Dy³⁺ phosphor has a double perovskite structure, and Dy³⁺ doping does not change the crystal structure of the sample. Under the excitation of near UV light (352 nm), the emission spectrum of the sample shows typical Dy³⁺characteristic emission, which is located at 485 nm in blue light region, 578 nm in yellow region and 650~700 nm in red region respectively. The concentration quenching occurred when the molar concentration of Dy³⁺ x=0.03 for YMT∶Dy³⁺phosphor and its mechanism is ascribed to dipole-dipole interaction (d-d). The CIE color coordinates of YMT∶Dy³⁺ phosphors are significantly affected by the concentration of Dy³⁺. Among them, the CIE color coordinate for YMT∶0.02Dy³⁺ phosphor is (0.406, 0.407), which is located in the warm white light region, and shows potential application for the n-UV excited warm white light emitting diodes (w-LEDs).

Key words: sol-gel method, Dy³⁺doping, Y₂MgTiO₆, double perovskite structure, warm white light, w-LEDs