TECHNOLOGY FOCUS - ELECTRONICS - Preferred Components: The organic LED comprises an anode (An) and a cathode (Ka) and at least one light-emitting layer E arranged between the anode (An) and the cathode (Ka), and optionally at least one further layer comprising at least one blocking layer for holes/excitons, at least one blocking layer for electrons/excitons, at least one hole injection layer, at least one hole conductor layer, at least one electron injection layer or at least one electron conductor layer, where (III) or (I) is present in the electron conductor layer and/or light-emitting layer E and/or in at least one of the further layers. (III) or (I) is present in the electron conductor layer and/or in the light-emitting layer and/or in the at least one blocking layer for holes/excitons.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (Claimed): Preparation of (III) comprises introducing at least one carbazolyl radical of formula (IV) and the optionally substituted five-membered nitrogen heterocycle C into a base skeleton of formula (V) by: (a1) preparation of a precursor compound suitable for introduction of the carbazolyl radical (IV), and optionally of the R2 radical(s) and of the C radical(s), (a2) introduction of the carbazolyl radical(s) (IV), (a3) introduction of the C radical(s) or its precursor and optionally introduction of the R2 radical(s), and (a4) if appropriate, conversion of the precursor of C to the C radical; or step (a1) as above per se, (b2) introduction of the C radical(s) or its precursor, (b3) introduction of the carbazolyl radical(s) (IV), and, if present, introduction of the R2 radical(s), and (b4) if appropriate, conversion of the precursor of C to the C radical. Preferred Definitions:    R1 = aryl comprising phenyl, naphthyl, anthracenyl, phenanthrenyl, indenyl or fluorenyl or heteroaryl comprising pyridinyl, pyrimidinyl, pyrrolyl, furanyl, pyrazolyl, imidazolyl, thiophenyl, oxazolyl, thiazolyl, triazolyl, benzofuryl, benzothienyl, benzopyrrolyl, dibenzofuryl, phenanthrolinyl, carbazolyl, azacarbazolyl or diazacarbazoyl (all optionally substituted);    n = 1;    m = 0;    X = O; and    at least one of Ra1, Rc1, Re1 or Rg1 = phenyl (optionally substituted).    Provided that (I) is not 1-(8-(2,5-dimethylpyrrol-1-yl)dibenzothiophen-2-yl)-2,5-dimethyl-pyrrole.    SPECIFIC COMPOUNDS - The use of 54 compounds (I) is specifically claimed e.g. 1-dibenzofuran-2-yl-2-(3-(1-dibenzofuran-2-ylimidazol-2-yl)phenyl)imidazole of formula (Ia), 1-dibenzofuran-2-yl-2-(3-(1-dibenzofuran-2-ylbenzimidazol-2-yl)phenyl)benzimidazole, 2-phenyl-1-(8-(3-(8-(2-phenylimidazol-1-yl)dibenzofuran-2-yl)phenyl)dibenzofuran-2-yl)imidazole, 2-phenyl-1-(8-(3-(8-(2-phenylbenzimidazol-1-yl)dibenzofuran-2-yl)phenyl)dibenzofuran-2-yl)benzimidazole and 2-phenyl-1-(8-(8-(2-phenylimidazol-1-yl)dibenzofuran-2-yl)dibenzofuran-2-yl)imidazole. 20 Compounds (III) are specifically claimed e.g. 9-(8-(2-phenyl-imidazol-1-yl)-dibenzofuran-2-yl)-9H-carbazole of formula (IIIa), 9-(8-(2-(3-carbazol-9-ylphenyl)imidazol-1-yl)dibenzofuran-2-yl)carbazole, 9-(8-(2-phenyl-benzoimidazol-1-yl)-dibenzofuran-2-yl)-9H-carbazole, 9-(6-(2-phenyl-imidazol-1-yl)-dibenzothiophen-2-yl)-9H-carbazole and 9-(8-(2-phenyl-imidazol-1-yl)-dibenzothiophen-4-yl)-9H-carbazole.    EXAMPLE - 2-Carbazolyl-8-imidazol-1-yldibenzofuran (2 g) was combined with palladium acetate (56 mg), copper iodide (1.93 g) and iodobenzene (2.08 g) in dimethylformamide (30 ml) under argon. The reaction was degassed with argon and heated to 140 degrees C. The reaction was stirred at 140 degrees C for 24 hours. The mixture was cooled to room temperature and precipitated with demineralized water, filtered with suction, washed with demineralized water and dried under reduced pressure overnight. The solid was dissolved in methylene chloride and repeatedly extracted by shaking with a 10% sodium thiosulfate solution. The organic phase was washed with water, removed and concentrated to give 2-carbazolyl-8-(2-phenylimidazol-1-yl)dibenzofuran (1.41 g, 59.2%).