TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The metal complex comprises more than one central metal atom. The central metal atom is chromium, molybdenum or tungsten.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The organic compound comprises a hetero aromatic compound, which is conjugated with aromatic compound over a C-C bond. The organic compound is a benzene derivative of formula (I). The organic compound (I) is 2,6,2',6'-tetraphenyl-(4,4')bipyridinyl, 2,9-dimethyl-4,7-diphenyl-(1,10)phenanthroline, 4,7-diphenyl-(1,10)phenanthroline, 6,6'-bis-(5-biphenyl-4-yl-(1,3,4)oxadiazol-2-yl)-(2,2')bipyridinyl, 4-naphthalen-1-yl-3,5-diphenyl-4H-(1,2,4)triazole, 2,9-di-naphthalen-2-yl-4,7-diphenyl-(1,10)phenanthroline, 2,5-di-pyridin-4-yl-pyrimidine, 1,4-bis(2-pyridin-4-yl)pyrimidin-5-yl)benzene, 2,2',6,6'-tetraphenyl-4,4'-bipyridine,1,3,5-tris(1-phenyl-2,3dihydro-1H-benzo(d)imidazol-2-yl)benzene, 1,2,3,4,5,6-hexaphenyl-pyridine, 2,3,5,6-tetraphenyl-(4,4')bipyridinyl, 2,4,6-tri-pyridin-4-yl-pyrimidine, 2-(biphenyl-4-yl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole, 1,3-bis(5-(2,2'-bipyridin-6-yl)-1,3,4-oxadiazol-2-yl)benzene, 5,6'-(4-phenyl-4H-1,2,4-triazole-3,5-diyl)di-2,2'-bipyridine, 5,5'-(9,9'-dimethyl-9H-fluorene-2,7-diyl)bis(2,2'-bipyridin-6-yl)-1,3,4-oxadiazole), 1,3-bis(5-(4-tert-butylphenyl)-1,3,4-oxadiazol-2-yl)benzene, 1,4-bis(2-phenylpyrimidin-5-yl)benzene, 1,4-bis(2-methylpyrimidin-5-yl)benzene, 1,4-di(1,10-phenanthrolin-3-yl)benzene, 1,4-bis(2,3,5,6-tetraphenylpyridin-4-yl)benzene, 1,4-di(benzo(h)quinidin-3-yl)benzene and 3,3'-bis(5-(biphenyl-4-yl)-1,3,4-oxadiazol-2-yl)biphenyl. At least a part of the organic compounds is bridged together with two metal complexes so that a chain like structure of the metal complex is formed and/or at least a part of the organic compounds is bridged together with more than two metal complexes so that a network structure of the metal complex is formed.A1-F1 = C;n = 2-8, where the free valencies of the ends can be saturated by H, methyl, phenyl, 2-pyridyl, 3-pyridyl or 4-pyridyl; andR1-R4 = H, methyl, phenyl, 2-pyridyl, 3-pyridyl or 4-pyridyl.Where: one or two of A1-F1 is N; and R1 and R2 or R3 and R4 can be interconnected by butadiene or azabutadiene units and can also be interconnected between the nth and (n+1)th ring by ethylene or azomethine units, to form phenanthrene or azaphenanthrene units. Preferred Method: At the time of evaporation, the organic compound is coordinated to the metal complex in the gas phase. The degree of cross linking of electron conducting layer is controlled by the ratio between metal complexes and organic compound during evaporation. The organic compound prior to the evaporation is not coordinated to the metal complex.