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Title: | Photoluminescence properties of Eu<sup>3+</sup> doped HfO<inf>2</inf> coatings formed by plasma electrolytic oxidation of hafnium | Authors: | Stojadinović, Stevan Tadić, N. Ćirić, Aleksandar Vasilić, Rastko |
Keywords: | Eu 3+;HfO 2;Photoluminescence;Plasma electrolytic oxidation | Issue Date: | 1-Mar-2018 | Journal: | Optical Materials | Abstract: | Plasma electrolytic oxidation was used for synthesis of Eu3+ doped monoclinic HfO2 coatings on hafnium substrate. Results of photoluminescence (PL) measurements show the existence of two distinct regions: one that is related to the blue emission originating from oxygen vacancy defects in HfO2 and the other one characterized with a series of sharp orange-red emission peaks related to f–f transitions of Eu3+ from excited level 5D0 to lower levels 7FJ (J = 0, 1, 2, 3, and 4). PL peaks appearing in excitation spectra of obtained coatings are attributed either to charge transfer state of Eu3+ or to direct excitation of the Eu3+ ground state 7F0 into higher levels of the 4f-manifold. PL of formed coatings increases with PEO time due to an increase of oxygen vacancy defects and the content of Eu3+. Acquired experimental data suggest that hypersensitive electrical dipole transition is much more intense than the magnetic dipole transition, indicating that Eu3+ ions occupy a non-inversion symmetry sites. |
URI: | https://physrep.ff.bg.ac.rs/handle/123456789/1032 | ISSN: | 0925-3467 | DOI: | 10.1016/j.optmat.2018.01.014 |
Appears in Collections: | Journal Article |
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