Investigation of Optical Characteristics in Sr3SiO5:Ce3+ Phosphor for High-Power White LEDs

A Sr3SiO5:Ce3+ phosphor was synthesized via a solid-state reaction and systematically characterized for its structural and optical properties. XRD analysis confirmed phase purity and tetragonal crystallinity, with slight peak shifts indicating successful Ce3+ substitution at Sr2+ sites, which also enhanced crystallinity and reduced defects. Diffuse reflectance spectra revealed an absorption edge at 275–300 nm, corresponding to a host band gap of 3.62 eV, suitable for UV excitation. Photoluminescence studies showed broad excitation (330–416 nm) and strong yellow-green emission centered at 530 nm due to Ce3+ 5d → 4f transitions. The phosphor exhibited an average decay lifetime of 46.2 ns, CIE coordinates of (0.42, 0.39), and a color purity of ~67%, highlighting its potential as a warm-white light-emitting material for LED applications.