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Photoluminescence and stoichiometry correlation in nanocrystalline EuOx thin films: Tunable colour emission

AuthorsMariscal, A. ; Tarazaga Martín-Luengo, A.; Galiana, Beatriz ; Ballesteros, Carmen; Bonanni, A.; Martín-Sánchez, Javier; Serna, Rosalía
Europium oxide
Tunable emission
Issue Date16-Jun-2020
PublisherAmerican Chemical Society
CitationJournal of Physical Chemistry C 124(28): 15434-15439 (2020)
AbstractThe development of broadband and ultra-compact optoelectronic devices relies on the possibility of fabricating bright and tunable emitters at the nanoscale. Here we show emission from EuOx (1 ≤ x < 1.4) thin films on Silicon formed by nanocrystals with average sizes in the range of 5 nm. The photoluminescence emission of the nano-EuOx films is tunable as a function of the oxygen concentration changing from a green broadband Eu2+−related emission to a narrow red Eu3+−related emission. To achieve these results has been instrumental the use of a new methodology specially designed to achieve high quality europium oxide films whose compositional properties are controlled by the growth base pressure and preserved thanks to a chemically stable and transparent cover layer of Al2O3. Our findings confirm the outstanding p otential of nanostructured EuOx films as “onecompound” optical elements with tunable emission properties for their implementation in integrated silicon-based devices
Publisher version (URL)https://doi.org/10.1021/acs.jpcc.0c03052
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(CFMAC-IO) Artículos
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