Electrofluorochromic materials have gained much exposure in recent years due to their reversible switching of fluorescence intensity upon electrical potentials. 1 The electrofluorochromic property can be generated from the interplay between electroactive moiety and fluorescence emission moiety. Recently, many electrofluorochromic materials have been prepared and used in photoelectric conversion devices, biological information storage, chemical sensors, and intelligent displays. 2,3 So far, electrofluorochromic materials can be broadly divided into four types: molecular dyads, 4-6 intrinsically switchable fluorophores, 7-9 switchable fluorescent polymers, [10][11][12][13][14][15][16] and switchable fluorescent composites. [17][18][19][20][21][22] Among those, electrofluorochromic polymers are highly desirable for their fast switching speed, facile molecular design and good processability. There are currently a variety of strategies to construct the electrofluorochromic polymers using different electroactive units and fluorescence emission units. For example, Xu and coworkers designed and synthesized a novel alternating conjugated polymer based on thiophene and tetraphenylethene derivatives, which exhibited an aggregation-enhanced fluorescent emission, electrochromic, and electrofluorochromic dualswitching behavior. 10 Kawabata and Goto reported a series of fluorescent conjugated polymers through electrochemical polymerization. The resultant polymer nanofibers showed an interesting electrofluorochromic performance in polarized photoluminescence. 23 Fluorescent polytriphenylamines was also prepared and reported as electroflorochromic materials. [24][25][26][27][28][29] Approving electrofluorochromic performance was displayed, ascribing to effective mitigation of aggregation-caused quenching effect benefiting from unique propeller starburst structure of triphenylamine. For better understanding of electrofluorochromic mechanism and expansion of practical applicability, electrofluorochromic polymers need to be further explored.As the model compounds of polyaniline, oligoanilines have drawn much attention in recent years due to their well-defined structure, good electro-optical properties, and facile molecular design. In light of their reversible electroactivity and relatively low redox potentials, oligoanilines have also been employed as electroactive moiety to construct electrofluorochromic polymers coupled with fluorescent triphenylamine derivatives. 30,31 Expected electrofluorochromic behavior has been revealed through several of electrochemical measurements with the assistance of spectrometric techniques. Due to the coexistence of two types of electroactive moieties (oligoaniline and triphenylamine), the energy transfer could between each other, resulting in an unclear electrofluorochromic mechanism for these system.In this work, we designed and synthesized a new electroactive polymer bearing oligoaniline, carbazole, and polyhedral oligomeric silsesquioxane (POSS) pendants (POCP). Its electrochemical properties, i...