TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: The organic electroluminescent device comprises a cathode, an anode and at least one organic layer containing (I).    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (Claimed): The preparation of (I), comprises reacting substituted phenanthrene compound having a leaving group in 1- and/or 4-position with a diarylamine compound or substituted triarylamine compound having leaving group in a coupling reaction to obtain (I). Preferred Definitions:    Ar1 = benzene, naphthalene, phenanthrene, fluoranthene, biphenyl, terphenyl, quaterphenyl, fluorene, spirobifluorene, furan, benzofuran, isobenzofuran, dibenzofuran, thiophene, benzothiophene, isobenzothiophene, dibenzo thiophene, indole, isoindole, carbazole, indolocarbazole, indenocarbazol, pyridine, quinoline, isoquinoline, acridine, phenanthridine, benzimidazole, pyrimidine, pyrazine or triazine.    SPECIFIC COMPOUNDS - 84 Compounds (I) are disclosed, e.g. N-(biphenyl-4-yl)-N-(phenanthren-4-yl)dibenzo(b,d)furan-4-amine of formula (Ia), N-(biphenyl-4-yl)-N-(9,9-dimethyl-9H-fluoren-2-yl)phenanthren-4-amine, N-(biphenyl-2-yl)-N-(9,9-dimethyl-9H-fluoren-2-yl)phenanthren-4-amine, N-(9,9-dimethyl-9H-fluoren-2-yl)-N-(phenanthren-4-yl)-9,9'-spirobi(fluoren)-4-amine and N-(9,9-dimethyl-9H-fluoren-2-yl)-N-(phenanthren-4-yl)-9,9'-spirobi(fluoren)-2-amine.    EXAMPLE - 29.4 g Trifluoromethanesulfonic acid phenanthrene-4-yl ester and 32.6 g N-(biphenyl-4-yl)dibenzo(b,d)furan-4-amine were dissolved in 340 ml toluene to obtain a solution, the solution was degassed and saturated with nitrogen, 2.2 g 2-dicyclohexylphosphino-2',6'-dimethoxybiphenyl, 4.13 g tris(dibenzylideneacetone)dipalladium(0) and 7.3 g sodium tert-butoxide were added to obtain a reaction mixture. Then the reaction mixture was heated to 85 degrees C for 4 hours under inert atmosphere, distributed between toluene and water, the organic phase washed three times with water, dried over sodium sulfate, evaporated, filtered, crude product was passed over silica gel with toluene, residue was recrystallized from heptane/toluene and then sublimed in high vacuum to obtain 38 g N-(biphenyl-4-yl)-N-(phenanthren-4-yl)dibenzo(b,d)furan-4-amine with 86% yield.