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Title: | Photoluminescence properties of Er <sup>3+</sup> /Yb <sup>3+</sup> doped ZrO <inf>2</inf> coatings formed by plasma electrolytic oxidation | Authors: | Stojadinović, Stevan Tadić, Nenad B. Vasilić, Rastko |
Keywords: | Down-conversion, up-conversion;Er /Yb 3+ 3+;Photoluminescence;Plasma electrolytic oxidation | Issue Date: | 1-Apr-2019 | Journal: | Journal of Luminescence | Abstract: | In the present work, down- and up-conversion photoluminescence properties of Er 3+ /Yb 3+ doped ZrO 2 coatings formed by plasma electrolytic oxidation of zirconium in electrolyte containing Er 2 O 3 and Yb 2 O 3 particles were investigated. Down-conversion PL analysis shows that emission spectra of ZrO 2 :Er 3+ /Yb 3+ coatings excited with 280 nm radiation are composed of broad PL band related to ZrO 2 host and bands assigned to f-f transitions of Er 3+ . The main PL emission bands of Er 3+ at around 548 nm and 560 nm are related to 4 S 3/2 → 4 I 15/2 transition. PL excitation spectra monitored at 548 nm feature broad band in the region from 250 nm to 350 nm which is associated with the electron transfer transition from 2p orbital of O 2− to 4f orbital of Er 3+ and transitions of ZrO 2 . On the other hand, bands in PL excitation spectra ranging from 350 nm to 535 nm are related to 4f transitions of the Er 3+ from the ground state 4 I 15/2 to higher energy levels. Down-conversion PL intensity decreases with increasing concentration of Yb 3+ in coating due to energy transfer from Er 3+ to Yb 3+ . ZrO 2 :Er 3+ /Yb 3+ coatings show intense green ( 4 S 3/2 → 4 I 15/2 ) and red ( 4 F 9/2 → 4 I 15/2 ) up-conversion PL emission under the excitation with a 980 nm diode laser. With increasing Yb 3+ concentration red up-conversion PL intensity increases more rapidly with respect to green emission, because red up-conversion PL intensity strongly depends on Yb 3+ concentration, i.e. 4 F 9/2 state of Er 3+ is directly excited by energy transfer from excited Yb 3+ . |
URI: | https://physrep.ff.bg.ac.rs/handle/123456789/981 | ISSN: | 0022-2313 | DOI: | 10.1016/j.jlumin.2018.12.067 |
Appears in Collections: | Journal Article |
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