Electrophoretic deposition and photoluminescent properties of Eu-doped BaTiO3 thin film from a suspension of monodispersed nanocrystallites

Abstract Monodispersed Eu-doped BaTiO3 nanocrystallites with a pseudo-cubic perovskite phase were successfully prepared using highly concentrated alkoxide solution under hydrothermal conditions at temperatures <100 °C. The obtained nanoparticles had a very narrow particle size distribution and the average value was about 10 nm. By dispersing a piece of BaTiO3 bulk gel into mixed solvent of 2-methoxyethonal and acetylacetone, we obtained well-dispersed and stable suspensions of Eu-doped BaTiO3 nanocrystallites with a high transmittance. Using these suspensions, nanostructured thin films with a low porosity and a smooth surface were synthesized on Pt/Ti/SiO2/Si substrate by electrophoretic deposition. The obtained Eu-doped BaTiO3 thin films showed strong, visible room temperature photoluminescence (PL) associated with Eu ions. The PL spectra had typical ones for Eu3+ band corresponding to 5Do–7Fj electronic transitions with a maximum intensity at 613 nm.

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