TECHNOLOGY FOCUS - ELECTRONICS - Preferred Element: A light-emitting element comprises quinoxaline derivative between electrodes (102,104).    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (disclosed): Boronic acid of quinoxaline derivative of formula (II) and pyridine derivative (X3-(B)n-Py) are coupled by Suzuki-Miyaura Coupling in presence of base such as potassium carbonate, and solvent such as mixed solvent of toluene and water, to obtain quinoxaline derivative (G11).X3=halo or triflate.Preferred Compounds: The quinoxaline derivative is preferably of formulae (G12-G16) and (G22-G26). Preferred Definitions:    R1=phenyl or biphenyl;and    B=phenylene, naphthalene-diyl or biphenyl-diyl.    SPECIFIC COMPOUNDS - 345 Specific quinoxaline derivatives are disclosed such as 2-phenyl-3-(4-pyridin-2-yl-phenyl)quinoxaline of formula (I), 2,5,8-triphenyl-3-(4-pyridin-2-yl-phenyl)-quinoxaline, 2-phenyl-3-(4-pyridin-3-yl-phenyl)-quinoxaline, 2-phenyl-3-(4-pyridin-4-yl-phenyl)quinoxaline and 2,5,8-triphenyl-3-(4-pyridin-4-yl-phenyl)-quinoxaline.    EXAMPLE - 4-3-(P-phenylquinoxalin-2-yl)phenylboronic acid (in g) (1.3), 2-bromopyridine (0.65), sodium carbonate (1.1), water (5 ml), ethylene glycol dimethyl ether (10 ml) and ethanol (4 ml) were added to flask, and degassed. Tetrakis(triphenylphosphine)palladium (0) (49 mg) was added to the flask and refluxed in presence of nitrogen for 7 hours. Water was added to the resultant mixture, and organic substance was extracted with ethyl acetate from aqueous layer. The extract was washed with saturated aqueous sodium hydrogen carbonate solution and saturated aqueous sodium chloride solution together with organic layer, and organic layer was dried. The obtained mixture was filtered, and filtrate was condensed to obtain a solid. The solid was purified by silica gel column chromatography and recrystallized with chloroform and hexane. Thus, white powder of 2-phenyl-3-(4-pyridin-2-yl-phenyl)quinoxaline (1.1) was obtained with a yield of 77%. Light-emitting element having an electron-transporting layer comprising 2-phenyl-3-(4-pyridin-2-yl-phenyl)quinoxaline, was prepared. The obtained light-emitting element provided blue light emission when luminance was 1040 cd/m2. The current efficiency was 4.1 cd/A, voltage was 6.8 V and power efficiency was 1.91 m/W, when the luminance was 1040 cd/m2.