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Structural study and luminescence of TlSrLa(AsO4)2 |
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| Authors: | M. LafjijN. El Jouhari A. BenabadG. Wallez P. GravereauA. Garcia G. LeFlem |
| Affiliation: | a Laboratoire de Chimie du Solide Appliquée, Département de Chimie, Faculté des Sciences, Université Mohammed V, Av. Ibn. Batouta, B.P. 1014, Rabat, Morocco b Laboratoire de Cristallochimie du Solide, Université Pierre et Marie Curie, 4 Place Jussieu, 75252 Paris Cédex 05, France c Institut de Chimie de la Matière Condensée de Bordeaux, UPR CNRS 90948, Château Brivazac, Av. du Docteur, A. Schweitzer 33600, Pessac, France |
| Abstract: | This work presents the crystal structure and luminescent properties of TlSrLa(AsO4)2. In this phase Tl+ ions are located in large tunnels delimited by chains of alternating (AsO4) and (Sr,La)O8 polyhedra. Thallium atoms are eightfold coordinated with C1 symmetry. Large TlO distances are observed revealing a low stereochemical activity of the 6s2 lone pair. Excitation and emission spectra of Tl+ in TlSrLa(AsO4)2 showed broad bands at lower energy than those observed in previous works. Excitation spectra are decomposed into multiple Gaussian bands and a theoretical analysis is made to explain the number of observed components. Two Gaussian components are revealed for emission spectra. |
| Keywords: | A. Inorganic compounds B. Chemical synthesis C. X-ray diffraction D. Luminescence |
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