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  • 1
    Electronic Resource
    Electronic Resource
    Effect of Pr3+ Doping on the OH Content of Silica Xerogels (1998)
    Springer
    Journal of sol gel science and technology 13 (1998), S. 599-603 
    Details
    ISSN: 1573-4846
    Keywords: silica xerogel ; Pr3+ ; OH contents ; luminescence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Pr2O3-SiO2 xerogels doped with different Pr/Si concentrations were annealed at 900°C for 120 h and then investigated by FTIR, NIR absorption, Raman and luminescence spectroscopies. It is observed that the content of surface silanol groups is lower for higher Pr3+ concentrations. Luminescence measurements indicate that the amount of the residual OH plays an important role in the spectroscopic properties of the Pr3+ ion and in particular the quantum yield of the emission from the 3P0,1 and 1D2 states.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008699412259
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Site selection spectroscopy of SiO2:Eu3+ gels (1994)
    Springer
    Journal of sol gel science and technology 2 (1994), S. 783-786 
    Details
    ISSN: 1573-4846
    Keywords: optical spectroscopy ; fluorescence line narrowing ; Eu3+ ; silica xerogel
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Silica gels doped with Eu3+ ions were studied at temperatures between 10 K and 300 K by site selection spectroscopy in samples heated up to 200°C. The 5D0 → 7F0 transition shows internal structures due to the different environments of the europium ions. Lifetimes, energy levels and homogeneous linewidths are site dependent. In the wet gel the Eu3+ ions prefer a liquid-like environment and only when the liquid is removed by heat treatment, the ion is linked more strongly to the silica network.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00486350
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    Paper (German National Licenses)
    Fulltext
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