Dielectric, electrical conductivity, and photoluminescence properties of CaGa2S4:Eu2+ added high-density polyethylene

Dielectric permittivity, electrical conductivity, and photoluminescence properties of high-density polyethylene with the additive of CaGa2S4:Eu+2 are studied. It was shown that dielectric permittivity and electric conductance increase with increasing filler concentration at all temperatures. In this case, conductivity has a hopping mechanism described by the Josher theory. The corresponding exponent parameter and activation energy slightly decrease with increasing filler concentration. The experimental data of dielectric permittivity are compared with the Maxwell-Garnett theory. It is also shown that the position of maximum of photoluminescence does not change with an increase in the concentration of Eu2+ ions and equals to about 550 nm. In this case, its intensity is maximal at the concentration of the filler is 5 mol. %.