Fourier transform infrared (FTIR) measurements (Figure ) document a band between 3000 to 3600 cm -1 linked to the O-H stretching vibrations of the PVA. This band broadens and shifts hypsochromically in the drop-cast 1 wt% TPA-CO2H doped film in PVA, which corroborates the proposed reorganization of the H-bonding network in the film. The resonances of the phenyl rings of TPA-CO2H in the 1 H NMR spectrum (Figure ) slightly shift upfield when mixed with PVA in DMSO-d6, along with the disappearance of the resonance of the carboxyl hydrogen at 12.8 ppm. From these studies, we conclude that the observed RTP in the doped film in PVA is due to the suppression of non-radiative decay resulting from the hydrogen bonding between TPA-CO2H and PVA.