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https://hdl.handle.net/1822/7747
Título: | Structure and photoluminescence of di-amidosil nanohybrids incorporating europium triflate |
Autor(es): | Nunes, Sílvia Zea Bermudez, V. de Cybinska, J. Ferreira, R. A. Sá Carlos, Luís Legedziewicz, J. Silva, Maria Manuela Smith, Michael John Ostrovskii, David |
Palavras-chave: | Alkyl/siloxane hybrids Amide crosslinks Europium triflate Photoluminescence |
Data: | 2008 |
Editora: | Elsevier 1 |
Revista: | Journal of Alloys and Compounds |
Citação: | "Journal of Alloys and Compounds". ISSN 0925-8388 .451 (2008) 510-515. |
Resumo(s): | 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-4f6 5D0 → 7F0–4 transitions. Photoluminescence data suggest that in the dilute di-amidosil with n = 100 the Eu3+ ions occupy the same type of chemical local environment. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/7747 |
DOI: | 10.1016/j.jallcom.2007.04.134 |
ISSN: | 0925-8388 |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: | CDQuim - Artigos (Papers) |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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JAC.pdf | main article with figures | 2,22 MB | Adobe PDF | Ver/Abrir |