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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
- 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.
- Subjects :
- Photoluminescence
010405 organic chemistry
Chemistry
[CHIM.ORGA]Chemical Sciences/Organic chemistry
Doping
Rare earth
Phosphor
Electron
Crystal structure
[CHIM.INOR]Chemical Sciences/Inorganic chemistry
010402 general chemistry
01 natural sciences
0104 chemical sciences
[SPI.MAT]Engineering Sciences [physics]/Materials
Inorganic Chemistry
Crystallography
Polymorphism (materials science)
[CHIM.CRIS]Chemical Sciences/Cristallography
Physical and Theoretical Chemistry
Luminescence
ComputingMilieux_MISCELLANEOUS
Subjects
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⟩