Journal ArticleDOI
The nature of the silica cage as reflected by spectral changes and enhanced photostability of trapped Rhodamine 6G
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TLDR
Rhodamine 6G was embedded in a matrix of silica gel glass by the sol-to-gel technique as discussed by the authors, and its photostability and non-leachability were discussed in comparison with other solid environments, such as adsorption on powders and within porous glasses, thin films, and doping of plastic matrices.Abstract:
Rhodamine 6G was embedded in a matrix of silica gel glass by the sol to gel technique. The special features of an inorganic oxide glass as a carrier of an organic dye are discussed in comparison with other solid environments, such as adsorption on powders and within porous glasses, thin films, and doping of plastic matrices. Among the advantages mentioned are photostability of the glass matrix, trapping of the dye molecule, and its total isolation from undesired interactions with its neighboring dye molecules, impurities, and photodecomposition products; nonleachability of the dye; the ability to reach stable very high dye concentrations; reduction of translational, rotational, and vibrational degrees of freedom of the trapped dye; good transparency down to the UV. Embedding R6G in the silica glass enables one to reach high concentrations without undesirable dye aggregation. Stokes shift is larger in the glass than in water. Photostability of the dye is higher in the glass than in water. A remarkable front-face fluorescence stability is observed. These observations, and a critical review of the literature, are used to elucidate the nature of the silica glass cage: it is suggested that it is a hydroxylic polar environment, though somewhat less polar than water. The rigidity of the cage is discussed in terms of required reorientation of the environment around an excited state.read more
Citations
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Preparation of a water-soluble oligo-(p-phenylene vinylene) embedded silica composite glass through a novel sol–gel process
TL;DR: In this paper, an improved sol-gel process is described to prepare a water-soluble oligo-(p -phenylene vinylene) (ws-OPV) doped silica composite glass.
Journal ArticleDOI
Mixed Pyridine-phenol Boron Complex Encapsulated in Polymer/Silica Hybrid Sol-gel Matrix
TL;DR: In this article, a novel pyridine-phenol boron complex was encapsulated into polymer/silica composite matrix by sol-gel process and the results of photoluminescence of (dppy)BF in solgel composite film indicate that both fluorescence intensity and photostability are markedly increased using this method compared with other methods.
Journal ArticleDOI
Nanosecond dynamics of phase transitions in chromophoredoped ferroelectric crystals
TL;DR: In this article, the microscopic dynamics of phase transition in ferroelectric crystals were studied using time-resolved fluorescence spectroscopy, which indicated that the order of the phase transition can be recovered using this technique.
Journal ArticleDOI
Luminescent hybrid materials based on organic phosphors and fluorides in the PbF2-LaF3 system
TL;DR: In this article , powder hybrid materials based on 8-hydroxyquinolate lithium organic phosphor and -LaF3 inorganic fluoride matrix PbF2 have been synthesized by co-precipitation from aqueous-alcoholic solutions with ammonium fluoride under various conditions.
References
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Book
Advanced chemical methods for soil and clay minerals research : proceedings of the NATO Advanced Study Institute held at the University of Illinois, July 23 - August 4, 1979
J. W. Stucki,W. L. Banwart +1 more
TL;DR: In this article, the authors discuss the potential of the Mossbauer Effect and its application to Nuclei Other than Iron in the field of NMR and the application of ESR Spectroscopy to Inorganic-Clay.
Journal ArticleDOI
Advanced Chemical Methods for Soil and Clay Minerals Research
J. W. Stucki,W. L. Banwart +1 more
TL;DR: In this paper, the authors discuss the potential of the Mossbauer Effect and its application to Nuclei Other than Iron in the field of NMR and the application of ESR Spectroscopy to Inorganic-Clay.
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