The excitation energy transfer between molcculars of laser dye dimethyl-POPOP and DCM in solution has been studied by measuring the fluorescence emission and decay kinetics. The results obtained show that the fluorescence of photoexcited dimethyl-POPOP was quenched by added DCM with the increase of the concentration of DCM. Though the fluorescence lifetime of DCM increased with the increase in dimethyl-POPOP's fluorescence quenching adding DCM did not change the fluorescence lifetime of dimethyl-POPOP anyway. The similar effect was also observed in the case of increasing the concentration of dimethyl-POPOP

when the DCM in solution was kept at constant concentration. These results convincingly indicate that there is an excitation transfer from photoexcited dimethyl-POPOP to DCM via radiative transfer mechanism. As a consequence the wavelength of incident radiation can be converted directly from UV into spectral region above 600nm. In addition

the possible approac-es to improve the efficiency of this process are discussed in brief.