Nucleation and Growth of Bipyramidal Yb:LiYF4 Nanocrystals─Growing Up in a Hot Environment

J.T. Mulder, Kellie Jenkinson, Stefano Toso, Mirko Prato, W.H. Evers, Sara Bals, Liberato Manna, A.J. Houtepen*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

Lanthanide-doped LiYF4 (Ln:YLF) is commonly used for a broad variety of optical applications, such as lasing, photon upconversion and optical refrigeration. When synthesized as nanocrystals (NCs), this material is also of interest for biological applications and fundamental physical studies. Until now, it was unclear how Ln:YLF NCs grow from their ionic precursors into tetragonal NCs with a well-defined, bipyramidal shape and uniform dopant distribution. Here, we study the nucleation and growth of ytterbium-doped LiYF4 (Yb:YLF), as a template for general Ln:YLF NC syntheses. We show that the formation of bipyramidal Yb:YLF NCs is a multistep process starting with the formation of amorphous Yb:YLF spheres. Over time, these spheres grow via Ostwald ripening and crystallize, resulting in bipyramidal Yb:YLF NCs. We further show that prolonged heating of the NCs results in the degradation of the NCs, observed by the presence of large LiF cubes and small, irregular Yb:YLF NCs. Due to the similarity in chemical nature of all lanthanide ions our work sheds light on the formation stages of Ln:YLF NCs in general.
Original languageEnglish
Pages (from-to)5311-5321
JournalChemistry of Materials
Volume35
Issue number14
DOIs
Publication statusPublished - 2023

Funding

This project has received funding from the European Union’s Horizon 2020 research and innovation program under Grant Agreement No. 766900 (Testing the large-scale limit of quantum mechanics).

Keywords

  • Lanthanides
  • LiYF4
  • YLF
  • Ytterbium
  • Nanocrystals
  • nucleation and growth
  • Doping
  • Phosphors

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