Abstract
Microemulsion-gel glasses doped with 7-amino—4-methyl coumarin (coumarin 120) and 7-dimethylamino—4-methyl coumarin (coumarin 311) were produced to study the luminescent properties of the resultant materials. The values of the fluorescent quantum yields, the emission wavelength maximum, the excitation wavelength maximum and the photostability were obtained as the gels dried and aged. The quantum yield values were observed to fluctuate with time, eventually settling on relatively stable values after 8 weeks. The samples which used only formamide as the initial solvent resulted in the material with the highest quantum yield values. The changing values of the emission wavelength maximum and the quantum yields indicated a hydrogen bond between the dye and the silicate network, i.e., silanols.
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