Abstract

Photochemical hole-burning(PHB) is a good tool for understanding the dynamics of host polymers as well as for realizing a high performance optical storage. The quantum efficiency for persistent hole formation, ϕ, is one of the essential parameters for the PHB phenomenon. If one is aware of some kinds of application, its value is preferable to be large. This is why the quantum efficiencies for several series of substances are measured and the efforts to find out the dominant factor for controlling these values are continued.¹⁾ As ever, these values are measured near the peaks of the lowest energy absorption bands. However, we noticed recently very large difference in quantum efficiencies of hole formation, ϕ, between the cases when the hole is burnt on the higher frequency slope or on the lower frequency slope of the lowest energy inhomogeneous absorption peak in the Q band of free base tetraphenylporphin derivatives.²⁾ We also found out the wavelength dependences of the formation rate of satellite holes, which originate from the vibronic excitations of the dye molecules accompanied by the electronic excitation. These facts suggest that the lowest energy inhomogeneous absorption band is actually composed of several kinds of vibronic dye transitions, and the 0-0 absorption component is one of the portion of this absorption band.

© 1992 Optical Society of America