Based on the synthesis of three novel dyes with blue color emission, the photo-physical behaviors of these compounds in solution have been studied in details. It was found that the fluorescence emission of these compounds can be quenched strongly by the aluminum tris(8- hydroxyquinoline), and simultaneously a new emissive band which was assigned to the exciplex formation appeared in the long wavelength region of fluorescence spectrum. Several experiments such as the measurement of fluorescence quenching constants of these compounds and the calculation of Gibbs' free energy changs of these processes indicated that the process studied in this work possesses electron transfer characteristic. The influence of photoinduced electron transfer and the exciplex formation between different components in device on the behavior of OLED and the comparison of these compounds used as blue emission dye were discussed preliminary. The compound DPF was thought to have the best emission characteristic.

Key words: HYDROXY QUINOLINES, ALUMINIUM COMPOUNDS, PHOTOINDUCED, CHARGE TRANSFER REACTION, CHARACTERISTICS OF LUMINESCENCE, FLUORESCENCE QUENCHER