Photoluminescence of zinc sulfide doped with Mn$^{2+}$ and Eu$^{3+}$ ions in dodecane medium

Photoluminescence (PL) of zinc sulfide powder synthesized and doped with Mn$^{2+}$ and Eu$^{3+}$ 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 : Mn$^{2+}$ (Eu$^{3+}$), 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 4$f$-electrons of Eu$^{3+}$ ions from the ground $^7F_0$ 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 $^5D_0\to^7F_j$ and $^4T_1\to^6A_1$ electronic transitions in Eu$^{3+}$ and Mn$^{2+}$ 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 Eu$^{3+}$ 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.