Structural optimization and efficient red luminescence performance regulation of Eu3+-Doped SrTiO3 perovskite

A series of rare earths elements Eu 3+ doped (0–7 mol%) SrTiO 3 nanocrystals were successfully synthesized via the hydrothermal method. X-ray diffraction (XRD) analysis confirmed that after calcination at 600 °C, impurities were eliminated, resulting in a pure perovskite structure. When the doping concentration of Eu 3+ ions reached 7 mol%, the material exhibited optimal luminescent performance. Under an excitation wavelength of 395 nm, it displayed characteristic Eu 3+ emissions, with primary peaks at 612 nm ( 5 D 0 - 7 F 2 ) corresponding to electric dipole transitions and secondary peaks at 591 nm ( 5 D 0 - 7 F 1 ) attributed to magnetic dipole transitions. Additionally, a blue-green emission peak ( 4 f 6 5 d 1 - 4 f 7 ) originating from Eu 2+ was observed. Through the collaborative optimization of hydrothermal synthesis, calcination process, and theoretical calculation (DFT), a red fluorescent material of SrTiO 3 :Eu 3+ was developed with excellent luminescence performance and stable luminescence efficiency. Its excellent color purity and luminescence efficiency indicate the potential application in white light LEDs. This research provides an important reference for the design of rare-earth-doped perovskite fluorescent materials.