Emitting Behaviors of 1-Acetylaminopyrene Dispersed in Poly(vinyl acetate) Film

Abstract

In order to create a new stimuli-responsible emitting system, we have investigated the thermal phase behaviors and emitting properties of the film of 1-acetylaminopyrene (AAPy) dispersed in poly(vinyl acetate) (PVAc). By heating the amorphous film obtained by spincoating method, crystallization took place at ca. 130 °C followed by melting and/or resolution to recover the homogeneous film over 200 °C. Both crystalline and amorphous phases could be reversibly obtained at room temperature by annealing the film at 130 °C and 245 °C, respectively. Such phase transition to control the state of the film at room temperature allowed the reversible fluorescence color change of the film due to the difference of emission spectra between amorphous and crystalline phases.