As another stimuli-responsive manner, heat stimulation was applied to explore the fluorescence properties and morphological change of DCzPy. The thermal behavior was firstly investigated by thermogravimetric analysis (TGA). DCzPy showed a high thermal stability and degraded at 683 K (Fig. ). The powders of DCzPy were then dissolved in chloroform and casted on the glass slide to fabricate a film. As shown in Fig. , a fluorescent film with green emission was obtained after evaporation of solvent at room temperature. Upon heating up to 323K, the edge of the film began to turn from green to blue, but the morphology of the film showed minor change (Fig. ). Further raising the temperature to 473K, the whole film emitted blue fluorescence and many microcrystals formed on the surface of glass (Figs. ), suggesting that the hypsochromic-shifted emission came from the recrystallization of DCzPy at high temperature. Their nanostructure change was also confirmed by the scanning electron microscopy (SEM) (Figs. ). There were many bubbles on the amorphous film at 298K (Fig. ). With increasing the temperature to 473K, many rod-like crystals were observed (Fig. and), which is in accordance with the fluorescent images. The PL spectral information was collected to record the variation of the fluorescence signals. The maximum emission wavelength was blue-shifted from 505 nm to 463 nm by the heating process (Fig. ). The PXRD measurement of DCzPy revealed that the fluorescent film crystallized from amorphous state during heating process (Fig. ).