TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The columnar oligomer structure is of formulae (-K1-K2-K1-K2-) (A) or (K1-K2-K3-K1-K2-K3-K1) (B). The oligomer comprises at least two, preferably at least five positively charged complexes and/or at least two, preferably at least five negatively charged metal complexes. (I) is: 78 platinum complexes e.g. (2,2')bipyridinyl platinate(II) complex of formula (a), phosphanylmethyl-boranyl-methyl-phosphanyl platinate(II) complex of formula (b); (3-imino-propenylamine) platinate(II) complex of formula (c); bis((1,8)naphthyridine) platinate(II) of formula (d) and bis(ethane-1,2-diimine) platinate(II) complex of formula (e); 5 palladium complexes i.e. N-containing heterocyclic palladium(II) complex of formula (f), (1-carbocycle substituted-2,3-dihydro-1H-imidazol-2-yl) palladium(II) complex of formula (g), (2,2')bipyridinyl palladium(II) complex of formula (h), (2,2';6',2'')terpyridine palladium(II) complex of formula (i) and (1,3-di(1H-imidazol-2-yl)benzene) palladium(II) complex of formula (j); 5 iridium complexes i.e. N-containing heterocyclic iridium(I) complex of formula (k), (1-heterocycle substituted-2,3-dihydro-1H-imidazol-2-yl) iridium(I) complex of formula (l), (2,2')bipyridinyl iridium(I) complex of formula (m), tetrakis(cyano) iridium(I) complex of formula (n), phosphanylmethyl-silylmethyl-phosphanyl iridium(I) complex of formula (o); and 4 rhodium complexes i.e. N-containing heterocyclic rhodium(I) complex of formula (p), (1-heterocycle substituted-2,3-dihydro-1H-imidazol-2-yl) rhodium(I) complex of formula (q), (2,2')bipyridinyl rhodium(I) complex of formula (r) and tetrakis(cyano) rhodium(I) complex of formula (s). (II) is: 26 platinate complexes e.g. ethene-1,2-dithiol platinate(II) complex of formula (t), (2-amino-benzenethiol) platinate(II) complex of formula (u), tetrakis(ethynyl) platinate(II) complex of formula (v), bis(quinoxaline-2,3-dithiol) platinate(II) complex of formula (w) and biphenyl-2,2'-platinate(II) complex of formula (x); 3 palladium complexes i.e. heterocyclic, carbocyclic conjugated palladium(II) complex of formula (y), (2-phenyl-pyridine) palladium(II) complex of formula (z) and (ethene-1,2-dithiol) palladium(II) complex of formula (aa); 10 iridium complexes e.g. (ethene-1,2-dithiol) iridium(I) complex of formula (ab), phosphanylmethyl-silylmethyl-phosphanyl iridium(I) complex of formula (ac), (2,6-diphenyl-pyridine) iridium(I) complex of formula (ad), (1,3-di(1H-imidazol-2-yl)benzene) iridium(I) complex of formula (ae) and (1-phenyl-2,3-dihydro-1H-imidazole) iridium(I) complex of formula (af); and 9 rhodium complexes e.g. (ethene-1,2-dithiol) rhodium(I) complex of formula (ag); (1,3-di(1H-imidazol-2-yl)benzene) rhodium(I) complex of formula (ah), (2,6-diphenyl-pyridine) rhodium(I) complex of formula (ai), (2-biphenyl-3-yl-pyridine)rhodium(I) complex of formula (aj) and ligand attached rhodium(I) complex of formula (ak). (II) is preferably tetracyanoplatinate(II), tetrachloroplatinate(II), tetrabromoplatinate(II), tetraiodoplatinate(II), bis(oxalato)platinate(II), bis(2,3-dimercaptomaleonitrilo)platinate (II) and bis(ethane-1,2-dithiol) platinate(II). In the oligomer, all the metal complexes exhibit the same central atom. The metal complexes used for doping is present at a molar ratio of 1:10000-1:3, based on the oligomer-matrix-forming metal complexes. The metal (M1) is at least partially different from the metal (M2). A first metal center comprising iridium (Ir), rhodium (Rh), platinum (Pt), palladium (Pd) or gold (Au) is present at 1-99%, preferably 10-90% in the oligomer and at a metal different from the first metal comprising Ir, Rh, Pt, Pd or Au is present at 1-99%, preferably 10-90%. The oligomer preferably comprises at least 3 metal central ions. The oligomer comprises at least one double-complex salt of the formulae ((L1L2L3L4M1)(n+)(L5L6L7L8M1)(n-)1-x(L5L6L7L8M2)(n-)x) (III) and ((L1L2L3L4M1)(n+)1-x(L1L2L3L4M2)(n+)x(L5L6L7L8M1)(n-)) (IV). The oligomer exhibits at least one further metal complex having a further central atom is used for doping. In formula (A),either K1 = single positively charged complex; andK2 = single negatively charged complex; orK1 = double positively charged complex; andK2 = double negatively charged complex.In formula (B),either K1 = double positively charged complex; andK2, K3 = single negatively charged complex; orK1 = double negatively charged complex; andK2, K3 = positively charged complex; orK1 = triple-positively charged complex;K2 = double negatively charged complex; andK3 = single negatively charged complex; orK1 = triple-positively charged complex;K2 = single negatively charged complex; andK3 = double negatively charged complex.R1-R14 = H, halo, -OR, -NR2 or SiR3;R = 1-30C (preferably 6-20C) hydrocarbon, alkyl, alkenyl, aryl or 1-5 heteroatoms (O, N, or S) containing heteroaryl (all optionally substituted by halo, 1-30C alkyl;NL1, NL2 = CO, CN, NC or oxazole; andAL1, AL2 = cyanide, chloride, bromide, iodide, RS, RO-, SCN-, OCN-, aryl, alkenyl, alkynyl or borate.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The oligomers are present at 2-100, (preferably 30-100) wt.% in the absorption layer of the light-absorbing device, based on the total weight of the absorption layer. EXAMPLE - Dichlorobis(acetonitrile) platinum(II) (0.3 g) was suspended in dry acetonitrile (50 ml) under nitrogen and silver tetrafluoroborate (0.336 g) was added to it. Then the reaction mixture was refluxed for 20 hours. The formed silver chloride was filtered off to obtain tetrakis(acetonitrile)platinum(IV) bis(tetrafluoroborate) (C). Then 4,4'-dinonyl-2,2'-dipyridyl (0.705 g) was added to the reaction mixture and worked up to obtain bis(4,4'-dinonyl-2,2'-dipyridyl) platinum(II) bis(tetrafluoroborate) (D). Then (D) (0.0209 g) and bis(tetrabutylammonium)tetracyanoplatinate (II) (0.0138 g) were dissolved separately in dichloromethane (4 ml). Then the two solutions were mixed. Then the reaction mixture was worked up to obtain bis(4,4'-dinonyl-2,2'-dipyridyl)platinum(II) tetracyanoplatinate(II).