TECHNOLOGY FOCUS - ELECTRONICS - Preferred Method: An electric charge carrying layer or light emitting layer of an organic electroluminescent element and electric charge carrying layer or active layer of organic transistor and organic solar cell, are formed using a composition (a).    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (disclosed): A hydroxylated alkyl compound and alkyl halide of 4,4'-bis (9-carbazoyl)-biphenyl are condensed to obtain biphenyl-containing compound (1).    TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: The composition (a) contains a polymeric material such as conjugated polymer, and biphenyl-containing compound (1). Preferred Definitions:    a=2-4, preferably 3.    SPECIFIC COMPOUNDS - 12 Specific biphenyl-containing compounds are disclosed, such as 3-(3-butoxy-propyl)-9-(4'-carbazol-9-yl-biphenyl-4-yl)-9H-carbazole of formula (I), 3,6-bis-(3-butoxy-propyl)-9-(4'-carbazol-9-yl-biphenyl-4-yl)-9H-carbazole, biphenyl bis(3,6-bis-(3-butoxy-propyl)-9H-carbazole), 3,6-bis-(3-butoxy-propyl)-9-(4'-carbazol-9-yl-biphenyl-4-yl)-9H-3,6-dibutyl-9H-carbazole and 9-(4'-carbazol-9-yl-biphenyl-4-yl)-3-(6-ethoxy-hexyl)-9H-carbazole.    EXAMPLE - 3-(9-(4'-Carbazol-9-yl-biphenyl-4-y l)-9H-carbazol-3-yl)-propan-1-ol (in g) (1.63) and N,N-dimethylformamide (16.3) were stir-mixed in a flask. Then, sodium hydride (0.24) was added and stirred for 30 minutes. Brominated n-butyl (0.82) was added and stirred for 18 hours. The obtained reaction liquid was added to water (100 ml), and extracted with chloroform (100 ml). The separated oil layer was washed with water. The obtained residue was purified with silica gel column chromatography, to obtain 3-(3-butoxy-propyl)-9-(4'-carbazol-9-yl-biphenyl-4-yl)-9H-carbazole (1.7) of formula (I) with yield of 94.4%. The obtained 3-(3-butoxy-propyl)-9-(4'-carbazol-9-yl-biphenyl-4-yl)-9H-carbazole had excellent charge transport property. An organic electroluminescent element having light emitting layer formed using composition containing the obtained 3-(3-butoxy-propyl)-9-(4'-carbazol-9-yl-biphenyl-4-yl)-9H-carbazole, had high light emission characteristics.