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Structure and photoluminescence of di-amidosil nanohybrids incorporating europium triflate

S. C. Nunes ; V. D. Bermudez ; J. Cybinska ; R. A. S. Ferreira ; L. D. Carlos ; J. Legendziewicz ; M. M. Silva ; M. J. Smith ; Denis Ostrovskii (Institutionen för teknisk fysik)
JOURNAL OF ALLOYS AND COMPOUNDS Vol. 451 (2006), 1-2, p. 510-515.
[Konferensbidrag, refereegranskat]

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.

Nyckelord: alkyl/siloxane hybrids, amide cross-links, europium triflate, photoluminescence

Denna post skapades 2009-10-27.
CPL Pubid: 100877


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