Photoluminescence of zinc sulfide doped with Mn-=SUP=-2+-=/SUP=- and Eu-=SUP=-3+-=/SUP=- ions in dodecane medium

Abstract

Photoluminescence (PL) of zinc sulfide powder synthesized and doped with Mn2+ and Eu3+ ions by the method of emerging reagents in a dodecane medium was investigated. In the absorption and excitation spectra of the PL samples ZnS and ZnS : Mn2+(Eu3+), bands corresponding to the transitions of electrons from the valence band to the conduction band and to the levels of structural defects of ZnS, as well as bands of transition of 4f-electrons of Eu3+ ions from the ground 7F0 to excited electronic states were recorded. A wide band associated with recombination processes at the energy levels of defects on the surface of ZnS particles is observed in the PL spectra. Narrow bands of PL are attributed to 5D0->7Fj and 4T1->6A1 electronic transitions in Eu3+ and Mn2+ ions. They are associated with the intra-zone glow centers formed by these ions in the ZnS structure. Energy transfer from ZnS defect levels to excited energy levels of Eu3+ ions was registered. Assumptions are made about the mutual influence of ZnS and alloying ions, as well as about the influence of synthesis conditions on the spectral properties of substances. Keywords: non-aqueous synthesis, dodecane, zinc sulfide, alloying, manganese (II) ions, europium (III) ions, photoluminescence.