Photoluminescence of epoxy resin modified by carbazole and its halogen derivative at 82K

The spectra and relative quantum yield of fluorescence and phosphorescence were measured for 9-(2,3epoxypropyl)carbazole (EPK) added to epoxy resin (R) (R5EPK – 5% weight content of the carbazole group in a polymer) and its mono and dihalogen derivative (Cl and Br). The materials under study have excellent mechanical properties. At 82 K photoluminescence (PL) spectra of these materials are composed of fluorescence (FL) and phosphorescence (PH) components while at 280 K, PH component is not observed. The vibrational frequencies of fluorescence and phosphorescence for R5EPK were determined using Gaussian deconvolution. A decrease in the fluorescence and an increase in the phosphorescence quantum efficiency were observed after chemical bonding of heavy atoms Cl and Br.