Photoluminescence of Ce3+ and Ce3+/Tb3+ ions in Al2O3 host formed by plasma electrolytic oxidation

Ce3+/Eu2+ Doped Al2O3 Coatings Formed by Plasma Electrolytic Oxidation of Aluminum: Photoluminescence Enhancement by Ce3+→Eu2+ Energy Transfer

“…1125.1 eV and 1155.2 eV, from the Eu 2+ oxidation state [19]. These results indicate that interaction between CeO2 and Eu2O3 particles with Al2O3, under environmental conditions set by PEO, causes the reduction of Ce 4+ ions to Ce 3+ ions and the reduction of some of Eu 3+ to Eu 2+ ions in Al2O3 host (e.g., [10,11] and references therein).…”

“…1125.1 eV and 1155.2 eV, from the Eu 2+ oxidation state [19]. These results indicate that interaction between CeO 2 and Eu 2 O 3 particles with Al 2 O 3 , under environmental conditions set by PEO, causes the reduction of Ce 4+ ions to Ce 3+ ions and the reduction of some of Eu 3+ to Eu 2+ ions in Al 2 O 3 host (e.g., [10,11] and references therein). For further investigation of the chemical nature and oxidation state of Ce and Eu in created coatings, we recorded a high-resolution Ce 3d and Eu 3d core-level spectra of Ce and Eu doped Al2O3 coating created in supporting electrolyte with the addition of 4 g/L CeO2 + 4 g/L Eu2O3 particles ( Figure 3).…”

“…Recent investigations have shown that PEO process of aluminum is capable of preparation of Ce 3+ and Eu 2+ doped Al 2 O 3 coatings in electrolyte enriched with CeO 2 and Eu 2 O 3 particles, respectively [10,11]. As ionic radii of Al 3+ (0.53 Å), and Eu 3+ (0.95 Å) and Ce 4+ (0.97 Å) [12] significantly differ, the substitution of Al 3+ by either Eu 3+ or Ce 4+ produces oxygen vacancies that in turn distort the crystal lattice.…”

Oxide coatings with immobilized Ce-ZSM5 as visible light photocatalysts

“…A set of luminescence measurements is performed in order to qualitatively probe the amount of Ce, because it is well known that Ce 3+ doped Al2O3 PEO coatings exhibit an intense PL emission in ultraviolet/visible spectral range with PL maximum positioned around 345 nm under 285 nm excitation due to the transitions of Ce 3+ ions from 5d excited state to the 4f ground state. 20 Emission PL spectra of PEO coatings obtained in electrolyte containing 1 g/L of ZSM5+Ce are presented in Fig. 4.…”

Zeolite-containing photocatalysts immobilized on aluminum support by plasma electrolytic oxidation

“…Al2O3 is an attractive host for rare-earth ions since it has many interesting properties such as high transparency from ultraviolet to near infrared region, excellent mechanical strength, high thermal conductivity, good chemical and photochemical properties, high melting point, etc. Ce 3+ doped Al2O3 PEO coatings exhibit an intense PL emission in ultraviolet/visible spectral range with PL maximum positioned around 345 nm under 285 nm excitation due to the transitions of Ce 3+ ions from 5d excited state to the 4f ground state [40][41][42]. i.e.…”