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Article Dans Une Revue Chemistry Année : 2021

Yb to Tb Cooperative Upconversion in Supramolecularly Assembled Complexes in a Solution

Résumé

The podand-type ligand L, based on a tertiary amine substituted by three pyridyl-6-phosphonic acid functions, forms hydrated complexes with Ln3+ cations. The luminescence properties of the YbL complex were studied in D2O as a function of the pD and temperature. In basic conditions, increases in the luminescence quantum yield and the excited state lifetime of the Yb centered emission associated with the 2F5/2 → 2F7/2 transition were observed and attributed to a change in the hydration number from two water molecules in the first coordination sphere of Yb at acidic pH to a single one in basic conditions. Upon the addition of TbCl3 salts to a solution containing the YbL complex in D2O, heteropolynuclear Yb/Tb species formed, and excitation of the Yb at 980 nm resulted in the observation of the typical visible emission of Tb as a result of a cooperative upconversion (UC) photosensitization process. The UC was further evidenced by the quadratic dependence of the UC emission as a function of the laser power density.

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Chimie
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Dates et versions

hal-03388717 , version 1 (22-10-2021)

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Lohona Soro, Cyrille Charpentier, Frédéric Przybilla, Yves Mély, Aline Nonat, et al.. Yb to Tb Cooperative Upconversion in Supramolecularly Assembled Complexes in a Solution. Chemistry, 2021, 3 (3), pp.1037-1046. ⟨10.3390/chemistry3030074⟩. ⟨hal-03388717⟩
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