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Photoluminescence and Stoichiometry Correlation in Nanocrystalline EuOx Thin Films: Tunable Color Emission

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2020-07-16
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American Chemical Society (ACS)
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The development of broadband and ultracompact 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 reach these results has been instrumental through 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 potential of nanostructured EuOx films as “one-compound” optical elements with tunable emission properties for their implementation in integrated silicon-based devices.
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Color, Ions, Thin Films, Transmission Electron Microscopy, Nanocrystals
Bibliographic citation
Mariscal-Jiménez, A., Tarazaga Martín-Luengo, A., Galiana, B., Ballesteros, C., Bonanni, A., Martín-Sánchez, J., & Serna, R. (2020). Photoluminescence and Stoichiometry Correlation in Nanocrystalline EuOx Thin Films: Tunable Color Emission. In The Journal of Physical Chemistry C (Vol. 124, Issue 28, pp. 15434–15439). American Chemical Society (ACS).