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Lecture

WEB Enhanced upconversion efficiency in LiYF4:Yb+3,Tm+3 nanocrystals by using anhydrous molecular precursors

Thursday (24.09.2020)
10:55 - 11:10 Z: Special Symposia I
Part of:


A major challenge in the field of up-conversion nanomaterials (UC) is the search for improved up-conversion luminescence. Compared to conventional luminophores, the quantum yields of lanthanide-doped nanoparticles are extremely low (typically <1%) and, in general, about an order of magnitude lower than those of corresponding up-conversion bulk materials [1]. It is well known that OH defects in nanocrystals are the main cause of up-conversion quenching [2]. Although SiO2@UCNP core-shell architectures are an established approach of increasing the efficiency of upconversion luminescence, this strategy cannot be universally used for all types of applications. We used anhydrous molecular precursors as a synthesis strategy to improve the up-conversion efficiency in lanthanide-doped nanocrystals (NCs). These well-defined molecular precursors allow to obtain different morphologies of LiYF4:Yb+3,Tm+3 nanocrystals under different conditions, which exhibit up-conversion efficiency comparable to that of UC bulk material. This work will describe the synthesis and full characterization of new lanthanide precursors and LiYF4:Yb+3,Tm+3 NCs as well as a comparative up-conversion study of nanocrystals and single crystals.

 

References:

[1] G. Tessitore, G. A. Mandl, M. G. Brik, W. Park, J. A. Capobianco, Recent insights into upconverting nanoparticles: spectroscopy, modeling, and routes to improved luminescence, Nanoscale (2019) 11, 12015–12029.

[2] Z. Wang, A. Meijerink, Concentration Quenching in Upconversion Nanocrystals, J. Phys. Chem. C (2018) 122, 26298−26306.

Speaker:
Bhagyesh Purohit
University Claude Bernard Lyon 1
Additional Authors:
  • Dr. Shashank Mishra
    Université Claude Bernard Lyon 1
  • Dr. Gilles Ledoux
    Université Claude Bernard Lyon 1
  • Dr. Erwann Jeanneau
    Centre de Diffractométrie Henri Longchambon
  • Dr. Yannick Guyot
    Université Claude Bernard Lyon 1
  • Dr. Benoit Mahler
    Université Claude Bernard Lyon 1
  • Dr. David Amans
    Université Claude Bernard Lyon 1
  • Dr. Marie-France Joubert
    Université Claude Bernard Lyon 1
  • Dr. Christophe Dujardin
    Université Claude Bernard Lyon 1
  • Dr. Stephane Daniele
    ESCPE-Lyon

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