Research on Chemical Intermediates

, Volume 18, Issue 1, pp 87–103 | Cite as

Multiple fluorescence spectra and stable encapsulation of 7-hydroxy-4-methylcoumarin and rhodamine 6g in silicate glasses by the sol-gel method

  • T. Fujii
  • Y. Murata
  • M. Matsui


7-Hydroxy-4-methylcoumarin(4-methylumbelliferone, HMC) and Rhodamine 6G(R6G) were encapsulated into silicate polymeric glass prepared by the sol-gel method under acidic, basic, and neutral conditions from tetraethyl orthosilicate. The fluorescence spectra of these molecules encapsulated into the xerogel state depend on the used catalysts. Three types of fluorescence emissions having peak wavelengths of ca. 390 nm, 470 nm, and 550 run, respectively, were observed simultaneously in the xerogel state composed of HMC and R6G which were prepared by acid catalysts. The encapsulated HMC remains stable for more than one year in the prepared xerogel. The results open the way to the development of simultaneous three-band laser emissions. The observation of the fluorescence spectrum of HMC is useful for a molecular level photophysical probe elucidating the structural changes oftetraethyl orthosilicate during sol to gel to xerogel transitions.


Fluorescence Spectrum Tetraethyl Orthosilicate Zink Fluorescence Band Fluorescent Component 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer 1992

Authors and Affiliations

  • T. Fujii
    • 1
  • Y. Murata
    • 1
  • M. Matsui
    • 2
  1. 1.Department of Chemistry and Material Engineering, Faculty of EngineeringShinshu UniversityWakasato, NaganoJapan
  2. 2.Fundamental Research Department, Central Research LaboratoryMitsubishi Cable Ind., Ltd.Amagasaki, HyogoJapan

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