Enhancement of the PL Intensity of Silica Based Polymer Electret after Electro-Thermo-Polarization

Abstract

In this study, the influence of electro-thermo-polarization (ETP) on the charge state and luminescence properties of polymer nanocomposites based on PP and nanoparticles of amorphous silicon dioxide nanoparticles were investigated. By comparing the results of the charge state and the intensity of the PL spectra of nanocomposites, it was determined that polarized composites with a 3% mass content of SiO₂ nanoparticles have relatively high luminescence. For the same composites PP + 3% SiO₂, relatively high values of the spatial space charge density, the intensity of the internal local field, and the thickness of the interphase layer are observed. Space charges create a large internal local field that stimulates the already existing oxygen deficiency centers in amorphous silica nanoparticles. This leads to the activation of the luminescence centers, which is the cause of the increase in the PL emission intensity in this nanocomposite after the ETP.

Keywords:

• Luminescence
• electro-thermo-polarization
• silica
• dielectric
• charge state