INTRODUCTION Recently, fluorescence-based polymers [1] [2] [3] have attracted great attention due to their intrinsic advantages including excellent biocompatibility, low toxicity, long-term stability and facile conjugation with functional molecules. In particular, polyurethane is one of the most popular polymers based on its enormous diversity of chemical compositions and properties 4-6 . The fluorescence-based polyurethane can be applied not only in textiles, moldings, films, coating materials

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... and paper making, but also in organic light emitting diodes, medical devices and fluorescent probes [7] [8] [9] [10] . 1,8-Naphthalimide derivatives are interesting compounds due to their useful photophysical and biological properties that offer promise for medical applications as free radical scavengers, potential photoredox anticancer agents, fluorescent labels, photosensitizers and imaging agents [11] [12] [13] [14] . Additionally, they are particularly attractive as fluorophores because they can demonstrate high quantum yields, good photostability and their fluorescence can be tuned throughout a wide spectral range from blue to red 15 . The attractive properties of the 1,8naphthalimide fluorophore have led to its incorporation into numerous polymers so as to tailor solubility, self-association and molecular size to suit a particular application 16, 17 . However, the direct application of 1,8-naphthalimide derivatives is unfavorable, as it is difficult to immobilization, easy