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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Enhanced luminescence in ZnAlEu layered double hydroxides with interlamellar carboxylate and beta-diketone ligands

Full text
Author(s):
Morais, A. F. [1] ; Machado, F. O. [1] ; Teixeira, A. C. [1] ; Silva, I. G. N. [1] ; Breynaert, E. [2] ; Mustafa, D. [1]
Total Authors: 6
Affiliation:
[1] Univ Sao Paulo, Inst Fis, BR-05508090 Sao Paulo, SP - Brazil
[2] KULeuven, Ctr Surface Chem & Catalysis, B-3001 Leuven - Belgium
Total Affiliations: 2
Document type: Journal article
Source: Journal of Alloys and Compounds; v. 771, p. 578-583, JAN 15 2019.
Web of Science Citations: 1
Abstract

The physico-chemical properties of layered double hydroxides (LDHs) can be tailored to a large extent by exploiting the flexibility of their chemical composition. This report describes the synthesis and the detailed quantitative characterization of the luminescence properties of novel Eu3+-containing LDHs intercalated by carboxylate and beta-diketonate anionic ligands. To prepare the samples, Zn2+, Al3+ and Eu3+ were coprecipitated in a ligand-rich solution containing 1,3,5-benzenetricarboxylate (BTC), acetylacetonate (ACAC), and thenoyltrifluoroacetonate (TTA). Powder X-ray diffraction is supportive for the intercalation of BTC and ACAC. The presence of TTA is revealed by CHN quantification and by the photoluminescence results. Detailed spectroscopic investigation of these materials demonstrates quantum efficiencies (eta) of 15-17% emerging from the symmetry reduction engendered by the organic ligands in the vicinity of Eu3+. Due to (i) the metal-to-ligand proximity provided by the layered structure, (ii) the existence of quasi-resonant electronic states between ligand and metal and (iii) the relaxation of the f-f selection rules caused by the distorted symmetry around Eu3+, these LDHs present enhanced luminescence in comparison to inorganic LDHs intercalated with nitrate. (c) 2018 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 15/19210-0 - Nanostructured double layered hydroxides with up e down-conversion properties for applications as sensitizers in solar cells
Grantee:Danilo Mustafa
Support Opportunities: Research Grants - Young Investigators Grants