Crystal Structure and Luminescent Properties of Eu3+-Doped A-La2Si2O7 Tetragonal Phase Stabilized by Spray Pyrolysis Synthesis

Autor:	Manuel Ocaña, Alberto J. Fernández-Carrión, Matthew R. Suchomel, Eugenio Cantelar, Pierre Florian, Ana I. Becerro, Andrew N. Fitch, Jorge García-Sevillano
Rok vydání:	2013
Předmět:	Materials science Doping Phosphor Crystal structure Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention NMR spectra database Tetragonal crystal system Crystallography General Energy law Phase (matter) Calcination Physical and Theoretical Chemistry Luminescence
Zdroj:	The Journal of Physical Chemistry C. 117:20876-20886
ISSN:	1932-7455 1932-7447
DOI:	10.1021/jp407172z
Popis:	Pure A-La2Si2O7 powder has been synthesized through a spray pyrolysis method followed by calcination at 1100 °C for 15 h. The crystallographic structure, refined from the synchrotron powder diffraction pattern of the sample, showed tetragonal symmetry with space group P41, a = 6.83565(1) A, and c = 24.84133(1) A. The 29Si and 139La NMR spectra have been described here for the first time in the literature and could be simulated with four Si and four La resonances, respectively, in good agreement with the presence of four Si and four La crystallographic sites in the unit cell. The same synthesis method was successful for the synthesis of Eu3+-doped A-La2Si2O7 (%Eu = 3– 40). The analysis of the unit cell volumes indicated that Eu3+ replaces La3+ in the unit cell for all Eu3+ substitution levels investigated. However, anomalous diffraction data indicated that the La/Eu substitution mechanism was not homogeneous, but Eu much prefers to occupy the RE3 sites. The Eu-doped A-La2Si2O7 phosphors thus synthesized ex...
Databáze:	OpenAIRE
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