Key words: polymer nanocomposite, supercritical carbon dioxide, quantum dots, photoluminescence, polytetrafluoroethylene, low-density polyethylene, diffusion embedding
Luminescence of composites based on quantum dots CdSe embedded into low-density polyethylene (LDPE) and polytetrafluoroethylene (PTFE) powders using supercritical carbon dioxide is studied. It is shown that thermal treatment of the resulting powders in air in the case of LDPE causes the CdSe photoluminescence band shift to shorter wavelengths, but in the case of PTFE — to longer wavelengths with simultaneous decrease of integral luminescence intensity. The behavior of photoluminescence bands under near UV radiation in both cases is determined by photo-oxidation processes on the CdSe nuclei.