TECHNOLOGY FOCUS - ELECTRONICS - Preferred Component: Each of the organic material layers includes an electron injection layer and/or an electron transport layer (6); and an organic light emitting layer (5).    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (Disclosed): (I) is prepared by reacting a fluorene compound with naphthylboronic acid or phenylthiophenylboronic acid, in toluene solvent and in presence of tetrakistriphenylphosphino palladium catalyst; or reacting a fluorene compound with bromoanthracene or bromonaphthalene in tetrahydrofuran solvent. Preferred Definitions:    Ar1, Ar2=aryl selected from Ph, naphthyl, binaphthyl, anthracenyl, biphenyl, pyrenyl, or perylenyl; or heteroaryl selected from pyridyl, bipyridyl, triazinyl, thienyl, imidazolyl, oxazolyl, thiazolyl, triazolyl, quinolyl, or isoquinolyl.    SPECIFIC COMPOUNDS - 7 Compounds (I) are specifically disclosed, e.g. a group of formulae (1-5), (1-23), (2-5), (3-5), or (6-2).    EXAMPLE - A benzimidazole-containing dibromofluorene compound (2.5 g) of Formula (1-C-1) and naphthyl-2-boronic acid (1.6 g) were added to toluene (30 ml), ethanol (10 ml), and 2 M potassium carbonate aqueous solution (20 ml). The mixture was added with tetrakistriphenylphosphino palladium (150 mg), and heating and agitation were performed for 15 hours. Then, water layer was removed and drying was performed by using anhydrous magnesium sulfide. Concentration was conducted at a reduced pressure to perform recrystallization with petrol ether to obtain benzimidazole-containing naphthalene-fluorene compound of formula (1-5) (2.6 g, yield 90%). Compound (1-5) was deposited on a light emitting layer in a vacuum to a thickness of 200 Angstrom , to form an electron injection layer and an electron transport layer. Lithium fluoride and aluminum were sequentially deposited on the electron injection layer and the electron transport layer to a thickness of 12 and 2000 Angstrom to form a cathode. Deposition rate of the organic substance was maintained at 0.4-0.7 A/sec; the lithium fluoride of the cathode at 0.3 Angstrom /sec; and the aluminum at 2 Angstrom /sec. Degree of vacuum was maintained at 2x 10-7 to 5x 10-8 torr during deposition. When a forward electric field of 7.1 V was applied to the manufactured organic light emitting device to emit light, an intensity of 10.31 cd/A was obtained at a current density of 100 mA/cm2, and green light corresponding to x-y coordinate of (0.33, 0.52) on 1931 CIE color coordinate was observed.