Employing anhydrous molecular precursors as a strategy to enhance up-conversion efficiency in Ln -3+ doped MM'F (M = Li, Na; M' = Y, Gd) - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2021

Employing anhydrous molecular precursors as a strategy to enhance up-conversion efficiency in Ln -3+ doped MM'F (M = Li, Na; M' = Y, Gd)

S. Mishra
B. Purohit
  • Fonction : Auteur
  • PersonId : 1053465
E. Jeanneau
  • Fonction : Auteur
G. Ledoux
M.-F. Joubert
  • Fonction : Auteur
C. Dujardin
  • Fonction : Auteur
Y. Guyot
D. Amans
  • Fonction : Auteur
B. Mahler

Résumé

A major challenge in the field of upconverting (UC) nanomaterials is to enhance upconversion luminescence. In comparison to conventional luminophores, quantum yields of lanthanide-doped UC nanoparticles are extremely low (typically less than 1%) and, in general, about an order of magnitude lower than those of corresponding UC bulk materials. It is well-known that –OH defects in the nanocrystals are the primary cause of upconversion quenching. We have employed designed anhydrous molecular precursors as a synthetic strategy to enhance upconversion efficiency in Yb and Tm co-doped MM'F nanocrystals (M = Li, Na; M' = Y, Gd). The bottom-up synthesis not only facilitates a better control over the composition, structure and morphology of the nanomaterials, but anhydrous conditions also minimize –OH functionality on the surface of the upconverting NPs. A detailed up-conversion studies reveal that the uniform nanoparticles obtained from these anhydrous single source precursors had i) superior up-conversion intensity than the UC materials produced from the hydrated inorganic salts, and ii) a comparable efficiency with bulk materials of the same composition. The applications of these nanomaterials in the field of photocatalysis will be described.
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Dates et versions

hal-03349246 , version 1 (20-09-2021)

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  • HAL Id : hal-03349246 , version 1

Citer

S. Mishra, B. Purohit, E. Jeanneau, G. Ledoux, M.-F. Joubert, et al.. Employing anhydrous molecular precursors as a strategy to enhance up-conversion efficiency in Ln -3+ doped MM'F (M = Li, Na; M' = Y, Gd). Materials Challenges in Alternative and Renewable Energy (MCARE 2021), Jul 2021, Bellevue, United States. ⟨hal-03349246⟩
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