关键词: Eu³⁺, 溶胶-凝胶法, Y₂MgTiO₆, 红色荧光粉, 热稳定性, LED

Abstract: A series of novel red-emitting phosphors of Y_2-2xMgTiO₆∶2xEu³⁺(YMT∶2xEu³⁺,0≤x≤0.11) were synthesized by sol-gel method. Phase purity was examined by X-ray diffractometer (XRD) and the results show that the obtained YMT∶Eu³⁺ phosphors crystallize in the monoclinic space group P2₁/n and no other peaks are observed.The SEM images show that the obtained particles exhibit the non-uniform shapes with an average size of 2 μm. The photoluminescence spectrum under the excitation of 264 nm reveals four narrow bands at 591, 619, 657 and 698 nm, which correspond to the ⁵D₀→⁷F₁, ⁵D₀→⁷F₂, ⁵D₀→⁷F₃ and ⁵D₀→⁷F₄ transitions of Eu³⁺, respectively. The energy transfer mechanism among Eu³⁺ ions is identified as dipole-dipole (d-d) interactions.The phosphor of YMT∶0.14Eu³⁺ exhibits a chromaticity coordinates of (0.645, 0.332),which is close to the standard red color coordinates (0.67, 0.33).The temperature-dependent PL spectra were analyzed, and the calculated activation energy indicates the acceptable thermal stability of the phosphor. Hence, the red-emitting phosphors of YMT∶Eu³⁺ can be potentially applied to LED.

Key words: Eu³⁺, sol-gel method, Y₂MgTiO₆, red-emitting phosphor, thermal stability, LED