Phosphors of the SrY2(MoO4)4 series co-doped with Pr3+ and Tb3+ ions were synthesized and investigated for optical temperature sensing applications. Their structure, morphology, and photoluminescent properties were thoroughly characterized using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), UV-vis absorption spectroscopy, and photoluminescence (PL) analysis. The intense dual-mode color-tunable emission revealed prominent transition bands corresponding to 5D4 → 7F j (j = 6, 5, 4, 3) for Tb3+ and 3P0 → 3H6 and 3P0 → 3F2 for Pr3+ ions under UV excitation at 450 nm. Chromaticity parameters for both doped and co-doped phosphors were also investigated, demonstrating emissions concentrated in the green and white regions. These properties highlight their potential for applications in solid-state lighting. The synthesized phosphors were further evaluated for their potential in optical temperature sensing based on the fluorescence intensity ratio (FIR) principle. The SrY2(MoO4)4: 0.1 Pr3+/0.4 Tb3+ phosphors demonstrated strong red emission with a color purity of 85% and achieved a high relative sensitivity of 1.9% K-1 for the 488 nm and 648 nm emission ratio, exceeding several reported molybdate-based thermometers, confirming their potential as multifunctional materials for efficient red component generation in solid-state lighting and precise, non-contact optical temperature sensing.
Bahrouni et al. (2025) studied this question.