Identification and optical features of the Pb4Ln2O7 series (Ln = La, Gd, Sm, Nd); genuine 2D-van der Waals oxides - Le Mans Université Accéder directement au contenu
Article Dans Une Revue Chemical Communications Année : 2019

Identification and optical features of the Pb4Ln2O7 series (Ln = La, Gd, Sm, Nd); genuine 2D-van der Waals oxides

Résumé

We report on the identification and survey of the Pb 4 Ln 2 O 7 series (Ln = La, Gd, Sm and Nd) which turn out to be real van der Waals 2D oxides. In the neutral layers, strong covalent Pb-O bonds together with external stereoactive Pb 2+ lone pairs, which act as sensitizers, lead to an ideal matrix for enhanced and tunable luminescence by lanthanide emitters, tested here for Sm 3+ and Eu 3+ doping. DFT calculations and preliminary ex-solution experiments validate the weak bonding between the layers separated by 3.5 Å and suggest a indirect to direct crossover realized by isolating the layers.
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hal-03098282 , version 1 (22-11-2021)

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Marie Colmont, Kévin Lemoine, Pascal Roussel, Houria Kabbour, Jacob Olchowka, et al.. Identification and optical features of the Pb4Ln2O7 series (Ln = La, Gd, Sm, Nd); genuine 2D-van der Waals oxides. Chemical Communications, 2019, 55 (20), pp.2944-2947. ⟨10.1039/C8CC07707J⟩. ⟨hal-03098282⟩
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