Back to Search Start Over

Pure and RE 3+ -Doped La 7 O 6 (VO 4 ) 3 (RE = Eu, Sm): Polymorphism Stability and Luminescence Properties of a New Oxyvanadate Matrix

Pure and RE 3+ -Doped La 7 O 6 (VO 4 ) 3 (RE = Eu, Sm): Polymorphism Stability and Luminescence Properties of a New Oxyvanadate Matrix

Authors :
Marielle Huvé
María Alejandra Gómez Torres
Valérie Dupray
Pascal Roussel
Lina Yuan
Anastasiya Zadoya
Gilles H. Gauthier
Marie Colmont
Anna M. Kaczmarek
Université de Laval - Département d'information et de communication
Université Laval [Québec] (ULaval)
Université d’Opole
Unité de Catalyse et Chimie du Solide - UMR 8181 (UCCS)
Centrale Lille Institut (CLIL)-Université d'Artois (UA)-Centrale Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Lille
Sciences et Méthodes Séparatives (SMS)
Université de Rouen Normandie (UNIROUEN)
Normandie Université (NU)-Normandie Université (NU)
Collaboration
Université d'Artois (UA)-Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)
Universidad Industrial de Santander [Bucaramanga] (UIS)
Universiteit Gent = Ghent University (UGENT)
Source :
Inorganic Chemistry, Inorganic Chemistry, American Chemical Society, 2020, 59 (9), pp.5929-593. ⟨10.1021/acs.inorgchem.9b03689⟩, Inorganic Chemistry, 2020, 59 (9), pp.5929-593. ⟨10.1021/acs.inorgchem.9b03689⟩
Publication Year :
2020
Publisher :
HAL CCSD, 2020.

Abstract

International audience; Two polytypes of the new oxyvanadate matrix La7O6(VO4)3 were identified and deeply characterized. The crystal structure of the α-polytype was solved using a combination of precession electron diffraction and powder X-ray diffraction (XRD) techniques. It crystallizes in a monoclinic unit cell with space group P21, a = 13.0148(3) Å, b = 19.1566(5) Å, c = 7.0764(17) Å, and β = 99.87(1)°. Its structure is built upon [La7O6]9+ polycationic units at the origin of a porous 3D network, evidencing rectangular channels filled by isolated VO4 tetrahedra. An in situ high-temperature XRD study highlights a number of complex phase transitions assorted with the existence of a β-polytype also refined in a monoclinic unit cell, space group P21/n, a = 13.0713(4) Å, b = 18.1835(6) Å, c = 7.1382(2) Å, and β = 97.31(1)°. Thus, during the transitions, while the polycationic networks are almost identical, the vanadate’s geometry is largely modified. The use of Eu3+ and Sm3+ at different concentrations in the host lattice is possible using solid-state techniques. The photoluminescence (PL), PL excitation (PLE) spectra, and luminescence decay times were recorded and discussed. The phosphors present an emission light, being bright and reddish orange after excitation under UV. This is mainly due to the V–O band and f–f transitions. Whatever the studied polytype, the final luminescence properties are retained during the heating/cooling process.

Details

Language :
English
ISSN :
00201669 and 1520510X
Database :
OpenAIRE
Journal :
Inorganic Chemistry, Inorganic Chemistry, American Chemical Society, 2020, 59 (9), pp.5929-593. ⟨10.1021/acs.inorgchem.9b03689⟩, Inorganic Chemistry, 2020, 59 (9), pp.5929-593. ⟨10.1021/acs.inorgchem.9b03689⟩
Accession number :
edsair.doi.dedup.....1fc1085751af67f96bc5e66fc9d577fd
Full Text :
https://doi.org/10.1021/acs.inorgchem.9b03689⟩