Luminescence and Laser Properties of the 10-Phenyl-9-acetoxyanthracene Derivatives

Abstract

Absorption and fluorescence spectra, fluorescence quantum yield and decay time have been measured for eight new 10-phenyl-9-acetoxyanthracene derivatives. It is found that the strength of the absorption transition is independent of the phenyl and anthracene substitution, whereas the strength of the fluorescence transition depends more on the functional groups substituted in the anthracene ring then in the phenyl ring. The loss of mirror symmetry between the absorption and emission spectra and the large values of the Stokes shift suggest that, due to perturbation of the functional groups, the molecular geometries of the S0 and S* 1 states are different. The investigated compounds show laser action. The relative value of the absorption threshold power, the gain spectra and the lasing region have been determined. It is found that the amplified spontaneous emission and gain spectra depend on the interaction of the substituted phenyl ring with the π-electrons of the anthracene ring