Pyrene-naftylamide bifluorophore for spectra-converting media

New bifluorophore containing pyrene as an excitation energy donor and naphtylamide as an acceptor is synthesized and its optical properties are studied. It is founded that excitation spectrum of the bifluorophore is almost the sum of its constituents--pyrene and naftylamide. At the same time, in the luminescence spectrum there only the peak of acceptor luminescence is observed, which indicates the effective radiationless energy transfer from the donor to the acceptor. This is also proved by time resolved measurements of bifluorophore decay. The decay rate was calculated from decay curve and appear to be 0.25 HC(-1). The same value obtained from the Förster's theory is almost by an order as high. It indicates that Förster's does not applicable in this particular case. Instead, we have to use the electron excitation density functions approach.