``Excimer'' and ``Defect'' Structure for Anthracene and Some Derivatives in Crystals, Thin Films, and Other Rigid Matrices

Abstract

The emission lifetimes of matrix‐stabilized dimers of anthracene and its derivatives were observed. The two principal conformations considered were the sandwich excimers and the 55° dimers. The excimer lifetimes may be of use in establishing wavefunctions for these transient states. A comparison of the lifetimes and emission structure from the dimers in rigid solvents with the time and wavelength structure of emission from strained crystals permits identification of a crystal defect in anthracene. The variable structure of anthracene thin films was demonstrated and partially identified.