The composite material was prepared using the solution-melt technique in a pressure gun equipped with a furnace allowing heating a reaction mixture in the pressure gun body in the temperature range from 20 to 300°C. The maximum pressure of the press plunger was 100 atm. Precursor components for the synthesis were Lotril polymer (ethylene-methyl methacrylate copolymer), zinc acetate, and thiourea. The polymer content in the mixture was 95-80%. The ratio of zinc acetate and thiourea was 2 : 1. The process of formation of zinc sulfide and embedding in a polymer network occurred at T = 210°C. Time of synthesis was ~20 min. The resultant solution-melt was poured into press molds and aircooled to room temperature. The synthesized samples were of white color characteristic of ZnS, unlike a glasslike polymer. The X-ray analysis of the resultant material was performed using a DRON-3.0 linear diffractometer (Fe Ka-radiation, the q-2q technique). The X-ray patterns of the samples exhibit diffraction peaks whose position corresponds to zinc sulfide. However, all the peaks are strongly broadened, which is indicative of a small size (nanoscale) of crystallites; their linear dimensions calculated by the half-widths of X-ray diffraction lines are 2-5 nm [1, 2]. The luminescence of the resultant material ranges from 0.4 to 0.6 mm.