The main purpose of this study is to synthesis a series of coumarin laser dyes which containing 3-benzothiazolyl group. These dyes were obtained by the condensing ethyl 2-benzothiazoly1 acetic acid with salicylaldehyde, 2,3-dihydroxybenzaldehyde, 2,4-dihydroxybenzaldehyde, 2,3,4-trihydroxybenzaldehyde or 2,4,6-trihydroxybenzaldehyde inthe present of piperidine. These laser dyes were then compared with coumarin 1. The results show the dye C and dye F having the relatively excellent fluorescence value, high quantum yield and low decay rate. It might be concluded that dye C and dye F were suitable for laser dyes.
