TECHNOLOGY FOCUS - ELECTRONICS - Preferred Components: The organic layer comprises an electroluminescent layer and a charge generating layer. A mixed region of reductive dopant and organic substance or a mixed region of oxidative dopant and organic substance is placed on the inner surface of one or both electrodes among the pair of electrodes.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Materials: The organic layer comprises Group 1, Group 2, fourth period and fifth period transition metals, lanthanide metals, or d-transition elements from the Periodic Table of Elements.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (disclosed): The (hetero)arylene-containing compound of formula Ar5-(AR6)N-Ar1-CC-Ar2-N(Ar4)-Ar3 is prepared by converting dibromo(hetero)arylene into bromo(hetero)arylene-containing aldehyde; reacting with an amine of formula Ar5-(Ar6)NH to produce an amine of formula Ar5-(Ar6)N-Ar1-CCH; and reacting with a bromo(hetero)arylene-containing compound of formula Br-Ar2-N(Ar4)-Ar3. Preferred Compounds: The organic layer comprises arylamine or styrylarylamine compounds. Preferred Property: The (hetero)arylene-containing compound has an electroluminescent peak with wavelength 500-560 nm. SPECIFIC COMPOUNDS - 2771 New organic electroluminescent (hetero)arylene-containing compounds of formula Ar5-(AR6)N-Ar1-CC-Ar2-N(Ar4)-Ar3 are disclosed, e.g. a diphenylaminofluorene-containing compound of formula (1), a dinaphthylaminofluorene-containing compound of formula (3), a dipyridylaminofluorene-containing compound of formula (37), a biphenylfluorene-containing compound of formula (8), and a methylphenylaminofluorene-containing compound of formula (12).    EXAMPLE - 2,6-Dibromofluorene (53.0 g) was dissolved in tetrahydrofuran (350 mL) and n-butyllithium (1.6 M in hexane, 63.2 mL) was added dropwise at - 78 degrees C. The mixture was added with N,N-dimethylformamide (16.3 mL). The temperature was slowly raised and the reaction mixture was stirred for 2 hours to give a bromofluorene-containing aldehyde. The aldehyde compound (20.9 g), diphenylamine (12.5 g), cesium carbonate (24.1 g), and palladium acetate (332 mg) were suspended in toluene (800 mL). After adding tri-t-butylphosphine (0.60 g), the resultant mixture was stirred at 120 degrees C for 4 hours to give diphenylaminofluorene-containing aldehyde. The diphenylaminofluorene-containing aldehyde (5 g) was added to a phosphine complex (19.8 g) and potassium t-butoxide (4.3 g) dissolved in tetrahydrofuran (250 mL). After stirring at room temperature for 10 minutes, potassium t-butoxide (11.5 g) was added and the mixture was stirred at room temperature for 2 hours to give a diphenylaminofluorene-containing acetylene compound (Compound C). Compound C (10 g), 7-bromo-9,9-dimethyl-N,N-diphenyl-9H-fluoren-2-amine (12.7), palladium dibenzylideneacetone (Pd(dba)2; 0.2 g), triphenylphosphine (0.8 g) and copper(I) iodide (0.5 g) were dissolved in triethylamine (260 mL) and the solution was stirred under reflux for 24 hours. Work up gave diphenylaminofluorene-containing compound of formula (1) (16 g; 72%).