PHOTOPHYSICAL AND LASING PROPERTIES OF PYRROMETHENE-567 DYE IN LIQUIDSOLUTION - ENVIRONMENT EFFECTS

The photophysical and lasing properties of the laser dye pyrromethene5 67 (PM567) have been studied by UV/VIS absorption, fluorescence (stead y-state and time-correlated), and laser techniques as a function of so lvent polarity, dye concentration, and temperature. UV/VIS absorption, fluorescence, and lasing bands of PM567 are mainly affected by the so lvent polarity, while the H-bond donor and acceptor ability of the sol vents has only a minor influence. These influences are analyzed in ter ms of the solvent stabilization on the resonance structures of the pyr romethene chromophore. Good correlations between fluorescence and lasi ng properties of PM567 have been observed, the dye showing the highest lasing efficiencies and fluorescences quantum yields in very polar pr otic solvents. (C) 1998 Elsevier Science B.V. All rights reserved.