Abstract: Two derivatives of 4-amino-1,8 naphthalimide were synthesized. Their photophysical properties were studied in various solvents. Both of their absorption and emission spectra showed a red shift as the polarity of solvents increased. But due to their different molecular structure, their photophysical properties showed some difference. The possibility of synthesizing colored copolymers by copolymerization with methylmethacrylate and N-vinylcarbazole including naphthalimide luminophores was investigated. The photophysical properties of the copolymers were studied and it showed little change in the fluorescence properties of copolymers compared with monomers. The fluorescence quenching mechanism between the two monomers and C₆₀ were also studied, the strong quenching may be caused by photoinduced charge transfer and π-π conjugated system interaction between luminophores and C₆₀. Further studies of their potential applications in organic electroluminescence fields were going on.

Key words: naphthalimide, photophysics, fluorescence quenching, organic semiconductor materials