TECHNOLOGY FOCUS - ELECTRONICS - Preferred Components: The organic material layer is an electron injecting and transporting layer, light-emitting layer, hole-transporting layer, or a layer simultaneously performing electron injection/transportation and light emission; and the layer comprises (I).    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (claimed): Preparation of (I) involves: process A: introducing each of an amino group having R7 and an amino group (NH2), respectively, at the 2- and the 3-carbon position of a optionally substituted naphthoquinone and introducing R8 at the amino group (NH2); b) forming an imidazole group by linking chains of the portions at which R7 and R8 are introduced, of the compound obtained in (a); c) converting the compound obtained in (b) to a dialcohol derivative; and d) reducing the compound obtained in (c) to form a naphthalene group; or process B: e) introducing each of an amino group having R7 and an amino group (NH2), respectively, at the 2- and the 3-carbon position of an optionally substituted naphthoquinone and introducing R8 at the amino group (NH2); f) forming an imidazole group by linking chains of the portions at which R7 and R8 are introduced, of the compound obtained in (e); g) reducing the compound obtained in (e) to form a naphthalene group; h) introducing a bromo group at the 8- or the 9-carbon position of the compound obtained in (g); and i) introducing a substituent at the position of the compound obtained in (h), in which a bromo group is introduced, with boronic acid. Preferred Definitions:    R1, R2 and R8=aryl or heterocyclic;    R3 - R6=H;and    R7=alkyl or aryl.    SPECIFIC COMPOUNDS - 51 Compounds are specifically claimed as (I) e.g. 4,9-di-naphthalen-2-yl-1-phenyl-2-(4'-(1-phenyl-1H-benzoimidazol-2-yl)-biphenyl-4-yl)-1H-naphtho(2,3-d)imidazole (IA).    EXAMPLE - 4,9-Di-naphthalen-2-yl-1-phenyl-2-(4'-(1-phenyl-1H-benzoimidazol-2-yl)-biphenyl-4-yl)-4,9-dihydro-1H-naphtho(2,3-d)imidazole-4,9-diol (2.2 g) was mixed with acetic acid (60 ml), potassium iodide (4.3 g) and NaH2PO2 (sodium hypophosphite) (5.2 g), and the reaction mixture was stirred at 120degreesC for 5 hours. After cooling the reaction solution and work-up, 4,9-di-naphthalen-2-yl-1-phenyl-2-(4'-(1-phenyl-1H-benzoimidazol-2-yl)-biphenyl-4-yl)-1H-naphtho(2,3-d)imidazole (IA) was obtained. On the light-emitting layer, (IA) was coated to a thickness of 200 Angstrom by vacuum deposition to form an electron-injecting/transporting layer. Next, on the electron-injecting/transporting layer, lithium fluoride (LiF) and aluminum were sequentially vacuum-deposited to a thickness of 12 Angstrom and 2000 Angstrom , respectively, to form a cathode. In the above process, deposition rate of each organic material was maintained at 1 Angstrom /sec and deposition rates of lithium fluoride and aluminum were maintained at 0.2 Angstrom /sec and 3 - 7 Angstrom /sec, respectively. When a forward electric field of 7.7 V was applied, green light emission of 3.9 cd/A was observed at a current density of 100 mA.