TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Process: In the process: the metal complex comprises at least two anchor groups of a first anchor group species for the covalent incorporation of the metal complex in the polymeric matrix, as the first reactant; and a second reactant to form the polymeric matrix comprises at least one anchor group of a second anchor group species, where the cross-linking of the metal complex in the polymeric matrix takes place by reaction of the at least two anchor groups of the metal complex, each with a second anchor group of the second reactant species. In the process, the shift in the given geometry is the change of tetrahedral coordination to a square-planar coordination. Preferred Components: The metal complex: is a mononuclear metal complex of formula (I) or a dinuclear metal complex of formula (II); and exhibits optionally an anchor group for covalent binding of the metal complex in the polymeric matrix, where the binding of the anchor groups to the organic ligand of the metal complex takes place in any position of the organic ligand of the metal complex, preferably not in the ortho-position of the metal-centre coordinating atom. The anchor groups are complementary anchor groups. The metal complex exhibits: an emission lifetime, in the electronic excited state, of maximum 20 mu s; and an quantum efficiency emission in the solid material of greater than 30%. The emission wavelength of the metal complex, after the embedding step, is shifted to at least 10 nm. The emission spectrum of the metal complex by embedding into the polymeric matrix is widened to at least 10 nm. The embedded metal complex emits white light.M = Cu, Ag or Au;L-L3 = ligand, which is a monodentate, bidentate, neutral or negatively charged ligands, preferably monodentate or bidentate phosphine ligands and arsane ligands with at least one N-donor atom;X = anion, preferably Cl, Br, I, SCN, CN, RS, RSe, R2N, R2P or RCC;R = alkyl (e.g. CH3, C2H5, n-propyl, isopropyl, n-butyl, tert-butyl or adamantyl), aryl (e.g. phenyl, tolyl, naphthyl or C6F5), alkenyl (e.g. CR=CR2aCR3a), alkynyl (-CCR1a), OR1a, N(R1a)2 (all deuterated, halogenated or optionally substituted by another alkyl, aryl, alkenyl or alkynyl groups), heteroaryl (e.g. furyl, thienyl, pyridyl or pyrimidyl), R1a, R2a or R3a; andR1a-R3a = H or R.