Photoluminescence measurement of poly (ethylene terephthalate) films

The poly(ethylene terephthalate)-PET is widely used in dielectric insulation, so the study on its luminescence characters is valuable. The Photoluminescence-PL intensity and spectra of PET films were detected by the home-made set-up. Experiment shows: The PL intensity with exponential decay along with the time. There are emitting peaks about 300-400 nm, 500-600 nm and nearby 700 nm in the PL accumulative spectra, and the peak region nearby 700 nm is a little higher. The absorption spectra were tested by TU-1901 double beam UV-Vis spectrophotometer. The calculation shows that energy gap of PET films is about 3.96 eV according to the absorption edge of the spectra. The results we obtained from the PL measurement indicate that this method will contribute to understanding the trap distribution and luminescent micro-mechanism of Insulation Polymers.