Sm-doped CaTiO3 phosphor: Synthesis, structure, and photoluminescent properties

Photoluminescent properties of samarium-doped calcium titanate for near ultra-violet excitation were studied. CaTiO₃:Sm³⁺ phosphor was synthesized by using the solid-state reaction method. The structure and properties of the phosphor were characterized by using X-ray diffractometer, scanning electron microscope, UV-visible spectrophotometer, high-resolution secondary ion mass spectrometer, and X-ray photoelectron spectrometer. The photoluminescent properties were studied by taking excitation and emission spectra. A strong red-orange luminescence corresponding to ⁴G_5/2 → ⁶H_7/2 transition of Sm³⁺ for near ultra-violet excitation was observed. It was found that CaTiO₃:Sm³⁺ was a red-orange emitting phosphor and had higher efficiency for the operation with near ultra-violet excitation.