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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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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container_issue 20
container_start_page 2944
container_title Chemical communications (Cambridge, England)
container_volume 55
creator Colmont, Marie
Lemoine, Kévin
Roussel, Pascal
Kabbour, Houria
Olchowka, Jacob
Henry, Natacha
Hagemann, Hans
Mentré, Olivier
description 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.
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subjects Bonding strength
Chemical Sciences
Crossovers
Crystal structure
Crystallography
Emitters
Gadolinium
Inorganic chemistry
Lanthanum
Lead
Material chemistry
Samarium
title Identification and optical features of the Pb4Ln2O7 series (Ln = La, Gd, Sm, Nd); genuine 2D-van der Waals oxides
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