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  • 1
    Electronic Resource
    Electronic Resource
    Photostability of the laser dye DCM in various inorganic-organic host matrices (1995)
    Springer
    Journal of sol gel science and technology 4 (1995), S. 67-73 
    Details
    ISSN: 1573-4846
    Keywords: photostability of laser-dye ; inorganic-organic matrix ; optical solid material ; fluorescence decay ; mobility of dye
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The laser dye, 4-dicyanomethylene-2-methyl-6-p-dimethylaminostyryl-4H-pyran (DCM) was incorporated in various inorganic-organic host matrices by the sol-gel technique. The photostability of the DCM-doped materials under CW argon laser irradiation was investigated. The absorption of DCM monomer ar 480 nm decreased with increasing irradiation time and was accompanied by an increase in the absorption at 352 nm by inactive photoproducts. Photostability was estimated by measuring the decay rates of DCM fluorescences in different host matrices. The rates exhibited two components; a rapid decay within the first several tens of seconds followed by a slower luminescence decay. The rapid decay depended upon the DCM content in the matrix while the slow decay component was related to the mobility of the DCM in the different matrices. The silica host matrix containing phenyl and a small amount of epoxy groups exhibited the best photostability of the materials examined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00486704
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Preparation of high homogeneity BaO-TiO2-SiO2 gel (1994)
    Springer
    Journal of sol gel science and technology 2 (1994), S. 387-391 
    Details
    ISSN: 1573-4846
    Keywords: BaO-TiO2-SiO2 gel ; homogeneity effect ; crystallization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract In BaO-TiO2-SiO2 system, crystallization from various gel by heating depended on the sol-gel processes and gel homogeneity. Through the condensation reaction of Si(OAc)4 and TiAcAc(O i Pr)3 in tetrahydrofuran solvent, homogeneous TiO2-SiO2 sol with oligomers of relatively large molecular weight was obtained. The gel prepared by mixing the binary sol, Ba(OAc)2, and Si(OMe)4 was the most homogeneous in term of suppression of crystallization. By heating the above gel, only Ba2TiSi2O8 crystal appeared, which was observed in a melt quenched glass. In the case of the gels made by other sol-gel processes, TiO2 or BaTiO3 crystal was first observed from the heated gels prior to the precipitation of Ba2TiSi2O8.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00486276
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    Paper (German National Licenses)
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