Photoluminescence and Stoichiometry Correlation in Nanocrystalline EuOx Thin Films: Tunable Color Emission
Open Access
- 16 June 2020
- journal article
- research article
- Published by American Chemical Society (ACS) in The Journal of Physical Chemistry C
- Vol. 124 (28), 15434-15439
- https://doi.org/10.1021/acs.jpcc.0c03052
Abstract
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.Funding Information
- North Atlantic Treaty Organization (984735)
- European Regional Development Fund (RTI2018-096498-B-I00)
- Austrian Science Fund (P24471, P26830)
- Ministerio de Econom?a y Competitividad (BES-2013-062593, RYC2018-026196-I)
- Horizon 2020 Framework Programme (645776)
- European Social Fund (RYC2018-026196-I))
- Agencia Estatal de Investigaci?n (RTI2018-096498-B-I00)
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