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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 2:12 |
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Conference: Bucharest University Faculty of Physics 2015 Meeting
Section: Optics, Spectroscopy, Plasma and Lasers
Title:
Crystallization behavior of LaOCl nanocristalline phase in a silica matrix: Optical study using Eu3+ probe ion
Authors:
Damir Victor MLADENOVIC(1), Mihail SECU(2), Corina SECU(3), Marian BAZAVAN(4)
Affiliation:
1)Affiliation Universitatea din Bucuresti, Facultatea de Fizica,Str. Atomistilor, nr. 405, Magurele, Jud. Ilfov
2)Affiliation NATIONAL INSTITUTE OF MATERIALS PHYSICS, Atomistilor Str., No. 105 bis PO Box MG 7, 077125, Magurele, Romania
3)Affiliation NATIONAL INSTITUTE OF MATERIALS PHYSICS, Atomistilor Str., No. 105 bis PO Box MG 7, 077125, Magurele, Romania
4)Affiliation Universitatea din Bucuresti,Facultatea de Fizica,Str. Atomistilor, nr. 405, Magurele, Jud. Ilfov
E-mail
Keywords:
LaOCl, nanocrystals, Eu3+, Judd-Ofelt theory
Abstract:
Glassy nanocomposites containing Eu3+-doped LaOCl nanocrystals of about tens of nm size embedded in a silica matrix have been prepared by using sol-gel route followed by controlled crystallization of the xerogel. Crystallization behavior of LaOCl nanocristalline phase was discussed on the basis of thermal analysis, X-ray diffraction and photoluminescence measurements.
LaOCl nanocrystalline phase precipitation is the result of lanthanum chloride decomposition accompanied by hydrolytic and oxidative reactions. As the annealing temperature increases nanocrystallites size grows up to tens of nm. The structural changes were studied using the Eu3+ as probe ion and its luminescence properties were analysed by using Judd-Ofelt theory.
References:
1)Structural, optical and non-linear investigation
of Eu3+ ions in sol–gel silicate glass
2)S. Hazarika, S. Rai
Free ion and crystal field parameters for REOCl : Eu3+
Jorma Hölsä, Pierre Porcher
3)P. Babu, C.K. Jayasankar, Physica B 279 (2000) 262
4)M.A. Chamarro, R. Cases, R. Aleala, Ann. de. Physique 16 (1991)
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