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Abstract
Various photophysical parameters of three substituted 7-diethylamino benzimidazo quinolines (I, II, and III) have been evaluated in three solvents: DMSO, DMF and chloroform. Based on these parameters, the probability of lasing action by the dyes is predicted and is confirmed from the preliminary laser investigations. Dye I (-CN Substitution in 3-position) and Dye III, which has an extended conjugated system in 3-position , have been found to be potential laser dyes, while Dye II (-CHO substitution in 3-position) is not.