Semiconducting material comprising (i) in elemental form, an electropositive element selected from alkali metals, alkaline earth metals, rare earth metals, and transition metals of the fourth period of the Periodic table having proton numbers 22, 23, 24, 25, 26, 27, 28, 29, and (ii) at least one first compound which is a compound comprising at least one polar group selected from phosphine oxide group or diazole group, wherein the first compound is a covalent compound which is free of a conjugated system of delocalized electrons or comprises a conjugated system of delocalized electrons having less than 10 conjugated delocalized electrons, characterized in that the reduction potential of the first compound, if measured by cyclic voltammetry under the same conditions, has the value which is more negative than the value obtained for tris(2-benzo[dltbiazol-2-yl)phenoxyaluminum, preferably more negative than for 9,9',10,10'-tetraphenyl-2,2'-bianthracene or 2,9-di([1,1'-biphenyl]-4-yl)-4,7-diphenyl-1,10-phenanthroline, more preferably more negative than for 2,4,7,9-tetraphenyl-1,10-phenanthroline, even more preferably more negative than for 9,10-di(naphthalen-2-yl)-2-phenylanthracene, even more preferably more negative than for 2,9-bis(2-methoxyphenyl)-4,7-diphenyl-1,10-phenanthroline, even more preferably more negative than for 9,9'-spirobi[fluorene]-2,7-diylbis(diphenylphosphine oxide), even more preferably more negative than for 4,7-diphenyl-1,10-phenanthroline, even more preferably more negative than for 1,3,5-tris(1-phenyl-1H-benzimidazol-2-yl)benzene, most preferably more negative than for pyrene and still preferably more negative than the value obtained for [1,1'-binaphthalen]-2,2'-diylbis(diphenylphosphine oxide). (i) in elemental form, an electropositive element selected from alkali metals, alkaline earth metals, rare earth metals, and transition metals of the fourth period of the Periodic table having proton numbers 22, 23, 24, 25, 26, 27, 28, 29, and (ii) at least one first compound which is a compound comprising at least one polar group selected from phosphine oxide group or diazole group, wherein the first compound is a covalent compound which is free of a conjugated system of delocalized electrons or comprises a conjugated system of delocalized electrons having less than 10 conjugated delocalized electrons, characterized in that the reduction potential of the first compound, if measured by cyclic voltammetry under the same conditions, has the value which is more negative than the value obtained for tris(2-benzo[dltbiazol-2-yl)phenoxyaluminum, preferably more negative than for 9,9',10,10'-tetraphenyl-2,2'-bianthracene or 2,9-di([1,1'-biphenyl]-4-yl)-4,7-diphenyl-1,10-phenanthroline, more preferably more negative than for 2,4,7,9-tetraphenyl-1,10-phenanthroline, even more preferably more negative than for 9,10-di(naphthalen-2-yl)-2-phenylanthracene, even more preferably more negative than for 2,9-bis(2-methoxyphenyl)-4,7-diphenyl-1,10-phenanthroline, even more preferably more negative than for 9,9'-spirobi[fluorene]-2,7-diylbis(diphenylphosphine oxide), even more preferably more negative than for 4,7-diphenyl-1,10-phenanthroline, even more preferably more negative than for 1,3,5-tris(1-phenyl-1H-benzimidazol-2-yl)benzene, most preferably more negative than for pyrene and still preferably more negative than the value obtained for [1,1'-binaphthalen]-2,2'-diylbis(diphenylphosphine oxide). <EOS>