Study of Optical Properties Blue Emitting Co2+ Doped Zn2SiO4 Phosphor

This study presents the synthesis and optical characterization of a blue-emitting Co2+-doped Zn2SiO4 phosphor, prepared via an economical solid-state reaction method. Co2+ doping concentrations were systematically varied (1, 2, 4, 6, 8, and 10 mol%) to explore their effect on the phosphor's properties. Powder X-ray diffraction (PXRD) analysis confirmed the orthorhombic crystal structure (ICCD No. 00-001-1975) of Zn2SiO4, with an average crystallite size of approximately 34.79 nm calculated using the Debye-Scherrer formula. Photoluminescence (PL) measurements revealed a prominent blue emission peak at 460 nm, attributed to the 4A2 → 4T1 (4P) + transition of Co2+ ions under 334 nm excitation. Additionally, the color coordinates and correlated color temperature (CCT) of the emission were determined, underscoring the phosphor's potential as a robust, efficient blue emitter suitable for optoelectronic and lighting applications.