Rare-Earth Sulfide Nanocrystals from Wet Colloidal Synthesis: Tunable Compositions, Size-Dependent Light Absorption, and Sensitized Rare-Earth Luminescence

  • Guillaume Gouget
    Guillaume Gouget
    Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
  • Morgane Pellerin
    Morgane Pellerin
    Research and Innovation Center Paris, Solvay, F-93308 Aubervilliers, France
  • Rabih Al Rahal Al Orabi
    Rabih Al Rahal Al Orabi
    Design and Development of Functional Materials Department, Solvay, Axel’One, 87 avenue des Frères Perret, 69192 Cedex Saint Fons, France
  • Lauriane Pautrot-D’Alençon
    Lauriane Pautrot-D’Alençon
    Research and Innovation Center Paris, Solvay, F-93308 Aubervilliers, France
  • Thierry Le Mercier
    Thierry Le Mercier
    Research and Innovation Center Paris, Solvay, F-93308 Aubervilliers, France
  • , and 
  • Christopher B. Murray*
    Christopher B. Murray
    Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
    *Email: [email protected]
Cite this: J. Am. Chem. Soc. 2021, 143, 9, 3300–3305
Publication Date (Web):March 2, 2021
https://doi.org/10.1021/jacs.0c13433
Copyright © 2021 American Chemical Society
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Abstract

We report the synthesis of colloidal EuS, La2S3, and LaS2 nanocrystals between 150 and 255 °C using rare-earth iodides in oleylamine. The sulfur source dictates phase selection between La2S3 and LaS2, which are stabilized for the first time as colloidal nanocrystals. The indirect bandgap absorption of LaS2 shifts from 635 nm for nanoellipsoids to 365 nm for square-based nanoplates. Er3+ photoluminescence in La2S3:Er3+ (10%) is sensitized by the semiconducting host in the 390–450 nm range. The synthetic route yields tunable compositions of rare-earth sulfide nanocrystals. Interaction of light with these novel semiconducting nanostructures hosting rare-earth emitters should be attractive for applications that require broadband sensitization of RE emitters.

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