Fluorescence Studies on Photo-Induced Structure Changes in Purified Biphenyl Crystals

Abstract

Fluorescence spectra of pure biphenyl crystals were measured over a wide temperature range. In contrast to the sharp peaks near 530, nm observed in crystals grown from methyl alcohol solution, a new broad band around 500, nm was found in zone-refined crystals at 5.0, K when the intense exciting laser was employed. From the temperature dependent behavior and the fluorescence decay characters, it is suggested that the new excimer-like band is related to photo-induced structural deformation in biphenyl crystals.