Pulsed laser deposition and structural evolution of BaF2 nanolayers in Eu-doped BaF2/Al2O3 layered optical nanocomposite thin films

Jin, Yu; Bond, Charles W.; Gomez-Rodrigue, Pilar; Nieto-Pinero, Eva; Leonard, Russell L.; Gosztola, David J.; Johnson, Jacqueline A.; Gonzalo, Jose; Serna, Rosalia; Petford-Long, Amanda K.

doi:10.1016/j.tsf.2022.139298

Title: Pulsed laser deposition and structural evolution of BaF₂ nanolayers in Eu-doped BaF₂/Al₂O₃ layered optical nanocomposite thin films

Journal Article · Fri May 13 00:00:00 EDT 2022 · Thin Solid Films

DOI:https://doi.org/10.1016/j.tsf.2022.139298· OSTI ID:1906381

^[1]; Bond, Charles W. ^[2]; Gomez-Rodrigue, Pilar ^[3];

^[3];

^[2];

^[4];

^[2];

^[3]; Serna, Rosalia ^[3]; Petford-Long, Amanda K. ^[1]

Northwestern Univ., Evanston, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
Univ. of Tennessee Space Inst. (UTSI), Tullahoma, TN (United States)
Consejo Superior de Investigaciones Cientificas (CSIC), Madrid (Spain). Instituto de Optica
Argonne National Lab. (ANL), Argonne, IL (United States). Center for Nanoscale Materials

Here, we have developed a pulsed laser deposition (PLD) geometry for the growth of uniform BaF₂ nanoscale thin films, through control of the deposition conditions. Our goal is to use the BaF₂ layers with controllable structure as component layers in layered optical nanocomposites. The structure of the BaF₂ nanolayer evolves as a function of the layer thickness: BaF₂ grows via a layer-by-layer growth mode on Al₂O₃; the layers are amorphous for a thickness < 3 nm, and then become nanocrystalline as the layer thickness increases. The BaF₂ nanocrystals have an FCC crystal structure with a weak < 111 > texture that becomes stronger for thicker films. We then demonstrate that our BaF2 films can be introduced into layered Al₂O₃/BaF₂/EuO_x nanocomposite films, which allows for control of the relative position of the Eu ions and the BaF₂ layer. Cross-section samples of the multilayered films show interfacial intermixing between the layers, which is related to implantation during the PLD process. This intermixing enables the incorporation of Eu ions into BaF₂ layers and form a thin Eu-doped BaF₂ nanolayer at the interface. The layered nanocomposite films show photoluminescence (PL) emission from Eu³⁺ ions, and the PL intensity changes can be correlated with the crystallinity and crystal size changes in the BaF₂ layer. Our results provide guidance for achieving thin film nanocomposite materials with controllable structure and photoluminescence behavior for light emitting diodes, photovoltaics and other optical applications.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES); Consejo Superior de Investigaciones Cientificas (CSIC); Community of Madrid; Spanish Ministry of Science and Innovation (MICINN); European Regional Development Fund (ERDF)

Grant/Contract Number:: AC02-06CH11357; DMR 160078; DMR 1600837; RTI 2018-096498-B-I00; E-28-2019-0767805; E-28-018-309435

OSTI ID:: 1906381

Journal Information:: Thin Solid Films, Vol. 754; ISSN 0040-6090

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Pulsed laser deposition and structural evolution of BaF₂ nanolayers in Eu-doped BaF₂/Al₂O₃ layered optical nanocomposite thin films