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Open AccessFeature PaperArticle

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

Faculty of Physics, University of Belgrade, Studentski trg 12-16, 11000 Belgrade, Serbia
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Coatings 2019, 9(12), 819; https://doi.org/10.3390/coatings9120819
Received: 16 November 2019 / Revised: 22 November 2019 / Accepted: 25 November 2019 / Published: 3 December 2019
Plasma electrolytic oxidation (PEO) of aluminum in electrolytes containing CeO2 and Eu2O3 powders in various concentrations was used for creating Al2O3 coatings doped with Ce3+ and Eu2+ ions. Phase and chemical composition, surface morphology, photoluminescence (PL) properties and energy transfer from Ce3+ to Eu2+ were investigated. When excited by middle ultraviolet radiation, Al2O3:Ce3+/Eu2+ coatings exhibited intense and broad emission PL bands in the ultraviolet/visible spectral range, attributed to the characteristic electric dipole 4f05d1→4f1 transition of Ce3+ (centered at about 345 nm) and 4f65d1→4f7 transition of Eu2+ (centered at about 405 and 500 nm). Due to the overlap between the PL emission of Al2O3:Ce3+ and the PL excitation of Al2O3:Eu2+, energy transfer from Ce3+ sensitizer to the Eu2+ activator occurs. The energy transfer is identified as an electric dipole–dipole interaction. The critical distance between Eu2+ and Ce3+ ions in Al2O3 was estimated to be 8.6 Å by the spectral overlap method. View Full-Text
Keywords: plasma electrolytic oxidation; Al2O3; energy transfer; photoluminescence; Ce3+/Eu2+ plasma electrolytic oxidation; Al2O3; energy transfer; photoluminescence; Ce3+/Eu2+
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Stojadinović, S.; Ćirić, A. Ce3+/Eu2+ Doped Al2O3 Coatings Formed by Plasma Electrolytic Oxidation of Aluminum: Photoluminescence Enhancement by Ce3+→Eu2+ Energy Transfer. Coatings 2019, 9, 819.

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