Structure and photoluminescence of di-amidosil nanohybrids incorporating europium triflate
Paper i proceeding, 2006

The sol-gel process was used to prepare amorphous di-amide cross-linked alkyl/siloxane hybrid materials (di-amidosils) incorporating europium triflate (Eu(CF3SO3)(3)). Samples with 200 <= n <= 8 (where n is the molar ratio of carbonyl oxygen atoms per Eu3+ ion) were studied. The conformations of the alkyl chains of the host matrix in the doped di-amidosils (essentially gauche) are not affected by the presence of the salt. The Eu3+ ions bond to the C=O groups of the amide cross-links in the whole range of salt concentration examined. "Free" and weakly coordinated triflate ions were detected in all the samples analyzed. At n = 8 an ionic aggregate of unknown nature is formed. The hybrids introduced are room temperature white light emitters due to the convolution of the hybrid host emitting centers (amide cross-linkages and siliceous nanodomais) and the Eu3+ intra-4f(6) D-5(0) -> F-7(0-4) transitions. Photoluminescence data suggest that in the dilute di-amidosil with n = 100 the Eu3+ ions occupy the same type of chemical local environment. (C) 2007 Elsevier B.V. All rights reserved.

alkyl/siloxane hybrids

europium triflate

photoluminescence

amide cross-links

Författare

S. C. Nunes

Universidade de Tras-os-Montes e Alto Douro

V. D. Bermudez

Universidade de Tras-os-Montes e Alto Douro

J. Cybinska

University of Wroclaw

Centro de Investigacao em Materiais Ceramicos e Compositos

R. A. S. Ferreira

Centro de Investigacao em Materiais Ceramicos e Compositos

L. D. Carlos

Centro de Investigacao em Materiais Ceramicos e Compositos

J. Legendziewicz

University of Wroclaw

M. M. Silva

Universidade do Minho

M. J. Smith

Universidade do Minho

Denis Ostrovskii

Chalmers, Teknisk fysik

Journal of Alloys and Compounds

0925-8388 (ISSN)

Vol. 451 1-2 510-515

Ämneskategorier

Annan teknik

DOI

10.1016/j.jallcom.2007.04.134

Mer information

Senast uppdaterat

2018-02-28