Furthermore, it is found that the emission of PLVP-3 is almost independent of the solvent circumstances (Figure and Table ), implying that the emission is not attributed to the intermolecular charge transfer (ICT), nor the formation of polymer/solvent complex. Moreover, the lifetimes of emission bands at 350 nm were around 6 ns for PLVPs with various MLA/2VP ratios, suggesting that the emission of PLVP is fluorescence, rather than phosphorescence (Figure and Table ). The ΦF of PLVP-1 to PLVP-5 in solution are measured as 20.6%, 21.8%, 20.5%, 19.5% and 20.1%, respectively. As a non-conjugated polymer, PLVPs give a fairly high ΦF value in solution, which is comparable to some traditional luminophores. assigned to the 0-0 and 0-1 vibrionic transition, respectively. Figure shows the normalized absorption and PL spectra of PMLA, P2VP, and the blend of PMLA and P2VP (w/w = 1/1) in ACN solution. The absorption peaks in P2VP and the blend at around 260 nm are ascribed to the intrinsic absorption of pyridine rings. For PMLA, no characteristic absorption peak can be observed. As shown in Figure , normalized PL peaks of PLVPs exhibit a slight red-shift from 400 to 412 nm as the MLA/2VP ratios varied from 5:1 to 1:5. More importantly, it is found that the wavelength of PLVP emission is very close to that of P2VP, despite the emission of P2VP is very weak (Figure ). Therefore, it implies that the emission of PLVPs is attributed to the induced/enhanced emission of pyridines by copolymerizing with lactone rings. nm. In addition, the emission intensity reduced with the increased high concentration.