TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Component: The organic photoelectric device comprises organic layer provided between anode and cathode. The organic layer comprises biphenyl compound (I). The organic layer comprises light-emitting layer, hole-transport layer, hole implant layer, electron-transport layer and/or electron injection layer. Preferred Definitions:    Ar1=aryl or arylene chosen from phenyl, biphenyl, terphenyl, stilbene, naphthyl, anthracenyl, phenanthrenyl, pyrenyl and perylenyl, or heteroaryl or heteroarylene chosen from thiophene, furan, pyrrole, imidazole, thiazolyl, oxazolyl, oxadiazolyl, triazolyl, pyridinyl, pyradazine, quinolinyl, isoquinolinyl, acridinyl imidazopyridinyl, imidazopyrimidinyl, benzo quinolinyl and phenanthrolidinyl, preferably phenyl, pyridinyl, pyrazinyl, isoquinolinyl, quinolinyl, quinazolinyl, pyrimidinyl, pyrazolyl, triazolyl, phenanthrenyl, anthracenyl, 4,7-phenanthrolinyl, 1,10-phenanthrolinyl, pyridoquinolinyl, benzoquinolinyl or phenanthridine;    Ar2-Ar5=aryl chosen from phenyl, biphenyl, terphenyl, stilbene, naphthyl, anthracenyl, phenanthrenyl, pyrenyl and perylenyl, heteroaryl chosen from thiophene, furan, pyrrole, imidazole, thiazolyl, oxazolyl, oxadiazolyl, triazolyl, pyridinyl, pyradazine, quinolinyl, isoquinolinyl, acridinyl imidazopyridinyl, imidazopyrimidinyl, benzo quinolinyl and phenanthrolidinyl, or amine chosen from diphenylamine, dinaphthylamine, phenylamine, phenyl naphthyl amine, phenyl diphenyl amine, ditolyl amine, phenyl tolyl amine, carbazole and triphenylamine, preferably fluoro, trifluromethyl or aromatic groups of formulae (3-66);and    X1-X6=pyridyl, phenyl, pyrimidinyl or 1,3,5-triazinyl.    SPECIFIC COMPOUNDS - 22 biphenyl compounds are specifically claimed e.g. 3-(3-(3-(3,5-bis(pyridin-3-yl)phenyl)phenyl)-5-(pyridin-3-yl)phenyl)pyridine of formula (2), 3-(3-(4-(3,5-bis(pyridin-3-yl)phenyl)phenyl)-5-(pyridin-3-yl)phenyl)pyridine, 4-(4-(2,6-bis(pyridin-3-yl)pyridin-4-yl)phenyl)-2,6-bis(pyridin-3-yl)pyridine, 2-(4-(4,6-bis(pyridin-3-yl)pyrimidin-2-yl)phenyl)-4,6-bis(pyridin-3-yl)pyrimidine and 2-(4-(4,6-bis(pyridin-3-yl)-1,3,5-triazin-2-yl)phenyl)-4,6-bis(pyridin-3-yl)-1,3,5-triazine.