Abstract
We used spectral line narrowing techniques (site selection spectroscopy and persistent spectral hole-burning) to investigate the vibronic visible spectra of different porphyrins included in various sol-gel matrices. Also, quinizarin and a quinizarin derivative have been studied. The main aim of this work is to compare pure inorganic matrices and hybrid (organic-inorganic) matrices in which organic groups are permanently attached to the inorganic squeleton.
© 1994 Optical Society of America
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