Abstract
Phosphors of the SrY(2)(MoO(4))(4) series co-doped with Pr(3+) and Tb(3+) 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 (5)D(4) → (7)F (j) (j = 6, 5, 4, 3) for Tb(3+) and (3)P(0) → (3)H(6) and (3)P(0) → (3)F(2) for Pr(3+) 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 SrY(2)(MoO(4))(4): 0.1 Pr(3+)/0.4 Tb(3+) 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.