PHOTOLUMINESCENCE PROPERTIES OF VARIOUS POLYTHIOPHENE DERIVATIVES

Electronic absorption and photoluminescence characteristics of various polythiophene derivatives have been studied. Fluorescence measurement s indicate that fluorescence quantum efficiency of the ester containin g polythiophene derivatives are higher than that of the alkyl containi ng derivatives. Among the ester group substituted polythiophenes, the longer alkyl side chain gives higher quantum efficiency. The quantum y ield of the polythiophene derivatives in solution is compared with the coumarin 500 laser dye. Electronic absorption and emission peak shift to the shorter wavelength are observed with increasing temperature.