Amorphous silica films doped with porphine derivatives were prepared by the sol-gel method with a dip-coating technique. The films doped with tetrakis(1-methylpyridinium-4-yl)-porphine p-toluenesulfonate (TMPyP) or tetraphenylporphine tetrasulfonic acid (TPPS) were heat treated at various temperatures, and the changes in the optical spectra were observed as a function of temperature. It was found that the porphins in the films could be heat treated up to ˜.200°C. A photochemical hole was formed in the lowest transition of the Q band of TMPyP in the silica film at ˜20 K.
© 1992 Optical Society of America
Hiroyuki Inoue, Takashi Iwamoto, Kazuyuki Horie, Akio Makishima, and Makoto Ikemoto, "Preparation and properties of sol-gel thin films with porphins," J. Opt. Soc. Am. B 9, 816-818 (1992)