Issue 35, 2008
From the journal:

Journal of Materials Chemistry

Photoluminescence of Eu(iii)-doped lamellar bridged silsesquioxanes self-templated through a hydrogen bonding array†

Sónia S. Nobre,ab   Carlos D. S. Brites,a   Rute A. S. Ferreira,a   Verónica de Zea Bermudez,c   Carole Carcel,b   Joël J. E. Moreau,b   J. Rocha,d   Michel Wong Chi Man*b  and  Luís D. Carlos*a  

* Corresponding authors

a Department of Physics, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal
E-mail: lcarlos@ua.pt
Fax: +351 234 378197
Tel: +351 234 370946

b Architectures Moléculaires et Matériaux Nanostructurés, ICG Montpellier (UMR 5253) CNRS-ENSCM-UMI-UMII, 8 rue de l'école, normale 34296 Montpellier CEDEX 05, France
E-mail: michel.wong-chi-man@enscm.fr
Fax: +33 467 144 353
Tel: +33 467 147 219

c Department of Chemistry, CQ-VR, University of Trás-os-Montes e Alto Douro, 5001-801Vila Real, Portugal

d Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal

Abstract

An organic molecule, (EtO)3Si(CH2)3NH(C[double bond, length as m-dash]O)NH–(CH2)12–NH(C[double bond, length as m-dash]O)NH(CH2)3Si(OEt)3, combining urea functionalities and a 12-carbon alkyl chain, underwent sol–gel reactions in the presence of an acid catalyst, a large excess of water and variable amounts of EuCl3, giving rise to the formation of crystalline hybrids through a self-directed organization process in which hydrogen bonding interactions play a key role. Three photoluminescent lamellar Eu3+-doped silsesquioxane hybrids incorporating 1.01, 1.83 and 15.04% Eu3+ were prepared and fully characterized. The lamellar hybrids are room temperature multi-wavelength emitters due to the convolution of the hybrid's emitting centres and the Eu3+ intra-4f6 transitions. Their emission colour can be easily tuned along the Commission Internationale d'Eclairage chromaticity diagram from the bluish-purple region to the pink area, either by changing the excitation wavelength or the Eu3+ amount. The Eu3+ first coordination shell is very similar for the three photoluminescent lamellar Eu3+-doped silsesquioxane hybrids incorporating oxygen atoms of the carbonyl group, Cl atoms and water molecules, despite the minor variations found in the 5D0 quantum efficiency (16.3–19.2), number of water molecules (1.7–2.0) and experimental intensity Ω2 parameter (8.9–10.1 × 10−20 cm2) with the increase of Eu3+ content.

Graphical abstract: Photoluminescence of Eu(iii)-doped lamellar bridged silsesquioxanes self-templated through a hydrogen bonding array

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Article information

DOI
https://doi.org/10.1039/B807262K
Article type
Paper
Submitted
29 Apr 2008
Accepted
18 Jun 2008
First published
28 Jul 2008

J. Mater. Chem., 2008,18, 4172-4182

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Photoluminescence of Eu(III)-doped lamellar bridged silsesquioxanes self-templated through a hydrogen bonding array

S. S. Nobre, C. D. S. Brites, R. A. S. Ferreira, V. de Zea Bermudez, C. Carcel, J. J. E. Moreau, J. Rocha, M. Wong Chi Man and L. D. Carlos, J. Mater. Chem., 2008, 18, 4172 DOI: 10.1039/B807262K

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