Photophysical properties and TPA optical limiting of two new organic compounds

The emission and optical limiting properties of two new organic compounds h ave been experimentally investigated. Pumping by picosecond and nanosecond lasers, respectively, these two compounds possess strong two-photon absorpt ion and optical limiting effects. The results of time-resolved fluorescence of them in DMF solvent at the different concentrations and small quantum y ields indicate that the non-radiation process and reabsorption result in th e low emission efficiency of these new molecules with large two-photon abso rption (TPA) cross-sections. (C) 2001 Elsevier Science B.V. All rights rese rved.