TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation: No general preparation given. Preferred Definitions:    Ar7-Ar18=phenyl, biphenyl, terphenyl, stilbenyl, naphthyl, anthracenyl, phenanthrenyl, pyrenyl, perylenyl, thiophenyl, furanyl, pyrrolyl, imidazolyl, thiazolyl, oxazolyl, oxadiazolyl, triazolyl, pyridinyl, pyridazinyl, quinolinyl, isoquinolinyl, acrylidinyl, imidazopyridinyl, imidazopyrimidinyl or benzoquinolinyl;and    Ar1-Ar6=phenylene, biphenylene, terphenylene, stilbenylene, naphthylene, anthracenylene, phenanthrenylene, pyrenylene or perylenylene.    SPECIFIC COMPOUNDS - The aromatic ring-containing compound is chosen from 31 specifically claimed compounds e.g. 4-(3-(2,6-diphenylpyridin-4-yl)-5-(4,6-diphenylpyrimidin-2-yl)phenyl)-2,6-diphenylpyrimidine of formula (A), 4-(3-(2,6-diphenylpyridin-4-yl)-5-(6-(naphthalen-1-yl)-2-phenylpyrimidin-4-yl)phenyl)-6-(naphthalen-1-yl)-2-phenylpyrimidine, 4-(3-(2,6-diphenylpyridin-4-yl)-5-(2-(naphthalen-2-yl)-6-phenylpyrimidin-4-yl)phenyl)-2-(naphthalen-2-yl)-6-phenylpyrimidine, 4-(3-(4,6-diphenylpyridin-2-yl)-5-(2,6-diphenylpyrimidin-4-yl)phenyl)-2,6-diphenylpyrimidine and 4-(3-(4,6-bis(naphthalen-2-yl)pyridin-2-yl)-5-(2,6-diphenylpyrimidin-4-yl)phenyl)-2,6-diphenylpyrimidine.    EXAMPLE - (In g) 4-(3,5-bis-(4,4,5,5-tetramethyl-(1,3,2)dioxaborolan-2-yl)-phenyl)-2,6-diphenyl-pyridine (8) and 2,4-dichloro-6-phenyl-pyrimidine (8.04) were reacted in presence of tetrakis(triphenylphosphine)palladium catalyst, potassium carbonate and tetrahydrofuran to obtain an intermediate with yield of 67.4%. The intermediate (6.6), phenyl boronic acid (4.42), tetrakis(triphenylphosphine)palladium (0.7) and tetrahydrofuran were reacted at 80 degrees C for 12 hours. The obtained solid was separated and purified to obtain 4-(3-(2,6-diphenylpyridin-4-yl)-5-(4,6-diphenylpyrimidin-2-yl)phenyl)-2,6-diphenylpyrimidine (5.8) with yield of 78.3%. The photoelectric device containing the obtained compound had low drive voltage and high luminous efficiency.