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Identification and optical features of the Pb₄Ln₂O₇ series (Ln = La, Gd, Sm, Nd); genuine 2D-van der Waals oxides
- Colmont, Marie, Lemoine, Kévin, Roussel, Pascal, Kabbour, Houria, OlchowkaCurrent address: CNRS, Université Bordeaux, Bordeaux INP, ICMCB UMR 5026, Pessac F-33600, France., Jacob, Henry, Natacha, Hagemann, Hans, Mentré, Olivier
- Chemical communications 2019 v.55 no.20 pp. 2944-2947
- chemical bonding, chemical reactions, europium, gadolinium, lead, luminescence, oxides, samarium, surveys, van der Waals forces
- We report on the identification and survey of the Pb₄Ln₂O₇ 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 Pb²⁺ lone pairs, which act as sensitizers, lead to an ideal matrix for enhanced and tunable luminescence by lanthanide emitters, tested here for Sm³⁺ and Eu³⁺ 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.