关键词: La₂MgTiO₆, 荧光粉, 红光发射, 光敏色素, Mn⁴⁺, Pr³⁺, 植物照明

Abstract: La₂MgTiO₆∶Mn⁴⁺, La₂MgTiO₆∶Pr³⁺, La₂MgTiO₆∶Pr³⁺, Mn⁴⁺ single-doped and co-doped phosphors were synthesized by high-temperature solid-state method. The phase structure, morphology, and luminescence properties of the phosphors were characterized and analyzed by means of X-ray diffraction, scanning electron microscopy, and fluorescence spectrophotometer. The results show that, La₂MgTiO₆∶Mn⁴⁺, La₂MgTiO₆∶Pr³⁺, La₂MgTiO₆∶Pr³⁺, Mn⁴⁺ phosphors with pure phase were successfully synthesized. The particle size of the samples is 1~2 μm. The red emission of La₂MgTiO₆∶Mn⁴⁺ at 650~750 nm is attributed to the ²E_g→⁴A_2g transition of Mn⁴⁺. La₂MgTiO₆∶Pr³⁺ exhibits strong emission in the red light range between 600 nm and 660 nm, which is attributed to the ³P₀→³H₆ and ³P₀→³F₂ transition of Pr³⁺. Because of the different red light emission regions of Mn⁴⁺and Pr³⁺, when they are co-doped in La₂MgTiO₆, the emission spectra of the co-doped phosphors closely match with the absorption spectra of phytochromes P_r and P_fr. The results indicate that, compared to the single-doped phosphors, the red light emission region of the Mn⁴⁺, Pr³⁺ co-doped phosphors are widely extended. The red light emission region of the co-doped phosphors are more tally with the needs for plants grow. The La₂MgTiO₆∶Pr³⁺, Mn⁴⁺ phosphors has potential application in LED plant illumination.

Key words: La₂MgTiO₆, phosphor, red light emission, phytochrome, Mn⁴⁺, Pr³⁺, plant illumination