Synthesis and photoluminescent properties of neodymium-ion doped perovskite oxides

The visible transitions of Nd3+ ions were found in the Ndx(Ca1−x−y−z,Bay,Srz)TiO3 system. All the compositions exhibit a pseudo-cubic structure. Based on the diffused reflectance spectra, the valence-to-conduction band edge for this system appears at 335 nm. A bright red luminescence at 613 nm is formed under excitation at 335 nm for all the compositions with x = 0.002 – 0.005 . With an increase in the dopant concentration of neodymium ions, the excitation and emission intensities both increase up to x = 0.005 of neodymium substitution. There is no shift in the excitation and emission spectra of the samples. This report is believed to be the first one in the literature to demonstrate strong visible emission from neodymium-doped oxide systems.