关键词: Li₂Mg₃TiO₆：Eu³⁺; 白光LED; 高温固相法; 红色荧光粉; 光学性能

Abstract: Li₂Mg₃TiO₆：Eu³⁺ red phosphor was synthesized by high-temperature solid-phase method. The phase structure was analyzed by X-ray diffractometer (XRD); the microscopic morphology was characterized by scanning electron microscope (SEM); the optical properties of the powders were tested by fluorescence spectrometer (PL). The results show that the crystal structure of Li₂Mg₃TiO₆：Eu³⁺ did not change after Eu³⁺ doping; the sample particles are uniformly distributed with an average particle size of 2.8 μm; the optimal excitation peak of Li₂Mg₃TiO₆：Eu³⁺ is located at 398 nm, the strongest emission peak is located at 617 nm, and the optimal doping concentration is 7%. The luminescence intensity maintained 60% of its initial intensity at 500 K due to its stable thermal ability. CIE chromatic coordinate of (0.327 4, 0.328 8),and a color rendering index (CRI) of 80. Combined with commercially available phosphors in a certain ratio to obtain light-emitting diode (LED) devices, Li₂Mg₃TiO₆：Eu³⁺ red phosphors have potential applications in white LED.This red phosphor can be applied to the LED devices excited by near-ultraviolet chip.

Key words: Li₂Mg₃TiO₆：Eu³⁺; white LED; high-temperature solid-phase method; red phosphor; optical property