A new class of laser dyes: Benzoxazinone derivatives

Spectroscopic properties and amplified spontaneous emission of fluorescein laser dye in ionic liquids as green media

“…7. This decrease in the gain with increasing in dye concentration beyond optimum concentrations (1 Â 10 À4 , 1Â 10 À4 , 8 Â 10 À2 mol/L for fluorescein in BMIM AlCl 4 , BMIM BF 4 and EtOH) respectively because of the dye molecules quenching and aggregation [41][42][43]. In case of BMIM Cl, fluorescence intensity of fluorescein dye increased gradually with increasing dye concentration till 1 Â 10 À2 mol/L without getting optimum concentration so, its optimum gain may be at concentration higher than 1 Â 10 À2 mol/L.…”

Optical, photo-physical properties and photostability of pyrromethene (PM-597) in ionic liquids as benign green-solvents

“…5. This decrease in gain with increasing PM-597 dye concentration beyond optimum concentration (1 Â 10 À 3 , 7 Â 10 À 4 and 3.5 Â 10 À 4 mol/L for PM-597 in BMIM Cl, BMIM BF 4 and EtOH, respectively) is because of the dye molecules quenching and aggregation effects [34][35][36] Under optimum concentration, the gain value of PM-597 increased because of the presence of the higher protonated form of PM-597.…”

Photophysical Properties of The DCM and DFSBO Styryl DyesConsequence for Their Laser Properties

“…The other dye, DFSBO which belongs to the benzoxazinone family also possesses an electron donor group (dimethylamino) and an electron acceptor group (carbonyl). 37,38 Le Bris et al have analyzed the shift of the fluorescence spectrum induced by the solvent polarity using the solvent polarity-polarizability parameter r* of Taft and Kamlet. 37 A good correlation was found between the wavenumber of the fluorescence maximum and r* in aprotic solvents.…”