关键词: Y₂MgTiO₆, Dy³⁺、Eu³⁺共掺杂, 溶胶-凝胶法, 发光性能, 热稳定性, LED

Abstract: A series of Y_2(0.97-x)Dy_0.06MgTiO₆∶2xEu³⁺(YMT∶0.06Dy³⁺,2xEu³⁺) phosphors were successfully synthesized by sol-gel method. The effect of Dy³⁺, Eu³⁺ co-doping on phase, microstructure and fluorescence properties of samples was investigated. The results show that the prepared YMT∶0.06Dy³⁺,2xEu³⁺ phosphors are double perovskite structure (crystallized in monoclinic space group P2₁/n) and the particle size is 1~2 μm. Under the excitation of 262 nm ultraviolet light, the emission spectra show a typical linear characteristic spectra of Dy³⁺ and Eu³⁺. The main emission peaks are located at 483(⁴F_9/2→⁶H_15/2), 579(⁴F_9/2→⁶H_13/2) and 619 nm (⁵D₀→⁷F₂), respectively. There is a significant energy transfer between Dy³⁺and Eu³⁺, which is mediated by electric dipole-electric dipole (d-d) interaction. The luminescence intensity of the obtained phosphors at 423 K could remain 74.36% of that at room temperature, showing excellent thermal stability. By changing the concentration of Eu³⁺, the luminescence color of phosphors shift from yellow region to orange-red spectral region. YMT∶0.06Dy³⁺,2xEu³⁺ phosphors are expected to be candidate materials for solid-state LED lighting.

Key words: Y₂MgTiO₆, Dy³⁺, Eu³⁺ co-doping, sol-gel method, luminescence property, thermal stability, LED