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We have observed that the  fluorescence colors of the ground samples are stable below respective Tcc(Tcc -20 ¡æ), but recover rapidly upon annealing above respective Tcc (Tcc + 10¡æ). Thus Tcc can be regarded as the critical thermal recovering temperature of ground FCn. The spontaneous recovery behaviour of ground FC10 and FC12 at room temperature could be ascribed to the low Tcc. It could be thought that long alkyl chain should not be in favor of molecular close packing and endow the materials with a low thermal transition temperature and easilydestroyed packing structure. Unfortunately, the single crystals of FCn are still unobtainable at present, and this impedes the discovery of the real reason. Overall, we can endow these PFC cruciforms with a tunable heat-recovering temperature, which could better satisfy various applications.

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