It is found that only a very weak PL can be observed in PMLA@2VP (Figure ). In addition, almost no significant PL signal is detected in the blend of PMLA and P2VP homopolymers in solution (w/w = 1/1). All the above results confirm that the emission of PLVP is not due to any luminescent impurity or byproduct. Also, it implies that the intrinsic PL of PLVP is attributed to the copolymerization of two monomers, and the covalent linkage of MLA and 2VP along the main chains is critical to the intrinsic emission of PLVP (see below).