TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The organic layer comprises at least one metal selected from organic metal of Group 1, Group 2, 4th period and 5th period transition metals, lanthanide metals and d-transition elements in the Periodic Table of elements.    TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Device: The organic electroluminescent device is an organic electroluminescent display comprising a compound having the electroluminescent peak with wavelength of 480-560 nm, or compound having the electroluminescent peak with wavelength of not less than 560 nm, in addition to the organic electroluminescent compound (I).    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation: No general preparation of the compound (I) is given. Preferred Components: The organic layer comprises at least one compound selected from arylamine compounds and styrylarylamine compounds; a charge generating layer as well as the electroluminescent layer. In the organic electroluminescent device, a mixed region of reductive dopant and organic substance, or mixed region of oxidative dopant and organic substance is placed on the inner surface of one or both electrode(s) among the pair of electrodes. Preferred Definitions:    ring A1,A2=pyrrolidin-2,3,4,5-tetra-yl (substituted at position 1 by R33), tetrahydro-thiophene-2,3,4,5-tetra-yl, silolan-2,3,4,5-tetra-yl (disubstituted at position 1 by R34 and R35), phospholan-2,3,4,5-tetra-yl (substituted at position 1 by R36), tetrahydro-furan-2,3,4,5-tetra-yl, piperidin-2,3,5,6-tetra-yl (substituted at position 1 by R33 and disubstituted at position 4 by R31 and R32), azepan-2,3,6,7-tetra-yl (substituted at position 1 by R33), 2,3,6,7-tetrahydro-1H-azepin-2,3,6,7-tetra-yl (substituted at position 1 by R33), morpholin-2,3,5,6-tetra-yl (substituted at position 4 by R33), thiomorpholin-2,3,5,6-tetra-yl (substituted at position 4 by R33), piperazin-2,3,5,6-tetra-yl (substituted at positions 1 and 4 by R33 respectively) or (1,4)azasilinane-2,3,5,6-tetra-yl (disubstituted at position 4 by R34 and R35 and substituted at position 1 by R33);    R31-R36=(1-60C)alkyl, (6-60C)aryl or (3-60C)heteroaryl (all optionally substituted by halo, (1-60C)alkyl (optionally substituted by halo), (3-60C)heteroaryl (optionally substituted (6-60C)aryl), (6-60C)aryl, 5- or 6-membered heterocycloalkyl containing at least one heteroatom selected from N, O or S, (3-60C)cycloalkyl, tri(1-60C)alkylsilyl, di(1-60C)alkyl(6-60C)arylsilyl, tri(6-60C)arylsilyl, adamantyl, (7-60C)bicycloalkyl, (2-60C)alkenyl, (2-60C)alkynyl, (1-60C)alkoxy, cyano, (1-60C)alkylamino, (6-60C)arylamino, (6-60C)ar(1-60C)alkyl, (6-60C)aryloxy, (6-60C)arylthio, (1-60C)alkoxycarbonyl, carboxyl, nitro or OH).    R31 and R32 or R34 and R35 may be linked via (3-60C)alkylene or (3-60C)alkenylene with or without a fused ring to form alicyclic ring, or monocyclic or polycyclic aromatic ring. Provided when both A1 and A2 represent pyrrolidin-2,3,4,5-tetra-yl (substituted at position 1 by R33), then R33 does not represent (1-5C)alkyl.    SPECIFIC COMPOUNDS - 725 Compounds are disclosed as the compound (I) e.g. 3-((E)-2-(9,9-dimethyl-7-((E)-2-(9-phenyl-9H-carbazol-3-yl)vinyl)-9H-fluoren-2-yl)vinyl)-9-((3E,5Z)-hepta-1,3,5-trien-4-yl)-9H-carbazole (IA); 3-((E)-2-(9,9-dimethyl-7-((E)-2-(9-phenyl-9H-carbazol-3-yl)vinyl)-9H-fluoren-2-yl)vinyl)-9-((3E,5Z)-hepta-1,3,5-trien-4-yl)-9H-carbazole; (Z)-9-(2-(buta-1,3-dienyl)-3-methylphenyl)-3-(4-(9,9-dimethyl-7-(4-(9-(naphthalen-1-yl)-9H-carbazol-3-yl)phenyl)-9H-fluoren-2-yl)phenyl)-9H-carbazole; 3,3'-(4,4'-(9,9-dimethyl-9H-fluorene-2,7-diyl)bis(4,1-phenylene))bis(9-(phenanthren-9-yl)-9H-carbazole) and 9-(9,9-dimethyl-9H-fluoren-1-yl)-3-(4-(7-(4-(9-(9,9-dimethyl-9H-fluoren-2-yl)-9H-carbazol-3-yl)phenyl)-9,9-dimethyl-9H-fluoren-2-yl)phenyl)-9H-carbazole.    EXAMPLE - A reaction vessel was charged with 2,7-dibromofluorene (30.2 g) and potassium hydroxide (45 g). After drying under reduced pressure, the vessel was filled with nitrogen gas. Dimethylsulfoxide (550 ml) was added, and the resultant mixture was stirred for 30 minutes. After 30 minutes, water was added thereto in a double water boiler. Iodomethane (57 g) was slowly added, and the mixture was stirred for 14 hours. The reaction mixture was washed with water (300 ml), and after workup, 2,7-dibromo-9,9-dimethyl-9H-fluorene (A1) was obtained. (A1) (20 g) was dissolved in tetrahydrofuran (1000 ml), and the solution was chilled to -78 degrees C. Then 2.5 M butyllithium (n-BuLi) (56.81 ml) was slowly added dropwise to it. After stirring for 30 minutes, N,N-dimethylformamide (DMF) (13.19 ml) was added. The mixture was stirred for 2 hours while slowly raising the temperature and the reaction was quenched by adding aqueous NH4Cl solution (800 ml) and distilled water (800 ml). After workup, 9,9-dimethyl-9H-fluorene-2,7-dicarbaldehyde (A2) (11.09 g) was obtained. A reaction vessel was charged with (A2) (11.09 g) and NaBH4 (2.5 g). After removing the air under reduced pressure, the vessel was filled with nitrogen gas. Tetrahydrofuran solvent (600 ml) was added, and the resultant mixture was stirred. While stirring, methanol (350 ml) was slowly added dropwise. After workup, (7-hydroxymethyl-9,9-dimethyl-9H-fluoren-2-yl)-methanol (A3) was obtained. A reaction vessel was charged with (A3) (5 g). After removing air from it under reduced pressure, the vessel was filled with nitrogen gas. Then 5 ml portion of triethylphosphite (10.15 ml) was added to obtain complete dissolution. Another reaction vessel was charged with remaining triethylphosphite (5.15 ml), which was stirred at 0 degrees C for 30 minutes while slowly adding I2 (9.98 g) with the lid open. After workup, compound of formula (Ia), was obtained. A reaction vessel was charged with N,N-dimethylformamide (26.62 ml). After drying under reduced pressure, the vessel was filled with nitrogen gas. Phosphorus oxychloride (16.09 ml) was slowly added dropwise at 0 degrees C. Then the temperature was raised to 25 degrees C, and stirring continued. After 2 hours, N-phenylcarbazole (14 g) was directly added in solid state. After 30 minutes, the mixture was heated and distilled at 90 degrees C with stirring for 18 hours. After workup, 9-phenyl-9H-carbazole-3-carbaldehyde (A5) was obtained. A reaction vessel was charged with compound (Ia) (5.1 g) and (A5) (5.8 g), and dried under reduced pressure. Under nitrogen atmosphere, tetrahydrofuran solvent (200 ml) was added, and the mixture stirred. Solution of potassium tert-butoxide (tert-BuOK) (4.14 g) dissolved in tetrahydrofuran (30 ml) was slowly added dropwise at 0 degrees C, and the temperature was slowly raised to ambient temperature. After stirring for 4 hours and the reaction was completed, water (500 ml) was poured, and the solid produced was filtered. After work up, 3-((E)-2-(9,9-dimethyl-7-((E)-2-(9-phenyl-9H-carbazol-3-yl)vinyl)-9H-fluoren-2-yl)vinyl)-9-((3E,5Z)-hepta-1,3,5-trien-4-yl)-9H-carbazole (5 g; yield: 68%).