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

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 e...

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Bibliographic Details
Published in:Chemical communications (Cambridge, England) England), 2019-03, Vol.55 (20), p.2944-2947
Main Authors: Colmont, Marie, Lemoine, Kévin, Roussel, Pascal, Kabbour, Houria, Olchowka, Jacob, Henry, Natacha, Hagemann, Hans, Mentré, Olivier
Format: Article
Language:English
Subjects:
Bonding strength
Chemical Sciences
Crossovers
Crystal structure
Crystallography
Emitters
Gadolinium
Inorganic chemistry
Lanthanum
Lead
Material chemistry
Samarium
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Summary: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.
ISSN:1359-7345
1364-548X
DOI:10.1039/c8cc07707j