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

authors

  • Mariscal Jimenez, Antonio
  • Tarazaga Martin Luengo, Aitana
  • GALIANA BLANCO, BEATRIZ
  • BALLESTEROS PEREZ, CARMEN INES
  • Bonanni, Alberta
  • Martin Sanchez, Javier
  • Serna, Rosalia

publication date

  • July 2020

start page

  • 15434

end page

  • 15439

issue

  • 28

volume

  • 124

International Standard Serial Number (ISSN)

  • 1932-7447

Electronic International Standard Serial Number (EISSN)

  • 1932-7455

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.