Optical and luminescence study of Sm3+/Tb3+ co-doped Sr5(PO4)3F halophosphate phosphors synthesized via combustion method
摘要
The synthesis of Sm³⁺/Tb³⁺ doped and co-doped Sr₅(PO₄)₃F halophosphate-based phosphors was synthesized using the combustion process. The phase purity and hexagonal crystal structure were confirmed by X-ray diffraction (XRD). The surface morphology and elemental composition of the samples were examined using scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS). Luminescence behavior was studied using photoluminescence (PL) spectroscopy. Under 405 nm excitation, the emission of Sm3+ doped Sr5(PO4)3F host at 602 nm (orange-red) corresponds to the 4G5/2→6H7/2 transition. Under 233 nm excitation, Tb3+ -doped Sr5(PO4)3F phosphor emits green light, with the highest emission at 551 nm (5D4→7F5). The Sm3+/Tb3+ co-doped Sr5(PO4)3F phosphors at excitation wavelength 235 nm are obtain emission peaks at 491 nm, 551 nm, 588 nm, 602 nm, and 627 nm. The calculated crystallite diameter is 61.10 nm. The critical transfer distance (Rc) of the Sm3+/Tb3+ co-doped Sr5(PO4)3F phosphor was 33.55 Å, with a decay period of τ = 2.0823 ms at 0.3 mol%. The main emission’s chromaticity coordinates were determined to be high color purity. The Sr5(PO4)3F: Sm3+/Tb3+ halophosphate-based phosphor is suitable for multicolour lighting applications.