Structural Dependent Eu³⁺ Luminescence, Photoelectric and Hysteresis Effects in Porous Strontium Titanate

Eu³⁺ doped porous nanostructured SrTiO₃ films and powder fabricated by sol-gel route without using any precursor template are characterized by different morphology and phase composition. The films show red and yellow luminescence with the most intensive photoluminescence (PL) bands at 612 nm and 588 nm, respectively. Raman, secondary ion mass spectrometry (SIMS), and X-ray diffraction (XRD) analysis of undoped nanostructured porous SrTiO₃ films showed the presence of TiO₂, SrO, and SrTiO₃ phases and their components. The undoped porous SrTiO₃ films are photosensitive and demonstrate resistive switching. The capacitance-voltage hysteresis loops with the width of about 6 V in the frequency range of 2 kHz-2 MHz were observed.