TECHNOLOGY FOCUS - ELECTRONICS - Preferred Layer: The organic layer is formed by solution process. The organic layer is hole implant layer (103), hole transport layer (104), light-emitting layer (105), electron transport layer (106), or electron injection layer (107). The organic layer is provided between electrodes (102,108).    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation: No general preparation given. Preferred Compound: Compound (I) is preferably of formula (II or III).R3,R4=R1,R2, respectively. Preferred Definitions:    L=group of formula (ii).    SPECIFIC COMPOUNDS - 28 Compounds (I) are specifically claimed e.g. Nasterisk3asterisk,Nasterisk3asterisk,Nasterisk3'asterisk,Nasterisk3'asterisk-tetraphenyl-5,5'-bis-(9-phenyl-9H-carbazol-3-yl)-biphenyl-3,3'-diamine of formula (IA), 5,5'-bis-(9-methyl-9H-carbazol-3-yl)-Nasterisk3asterisk,Nasterisk3asterisk,Nasterisk3'asterisk,Nasterisk3'asterisk-tetraphenyl-biphenyl-3,3'-diamine, 5,5'-bis-(9-ethyl-9H-carbazol-3-yl)-Nasterisk3asterisk,Nasterisk3asterisk,Nasterisk3'asterisk,Nasterisk3'asterisk-tetraphenyl-biphenyl-3,3'-diamine, 5,5'-bis-(9-naphthalen-2-yl-9H-carbazol-3-yl)-Nasterisk3asterisk,Nasterisk3asterisk,Nasterisk3'asterisk,Nasterisk3'asterisk-tetraphenyl-biphenyl-3,3'-diamine, and 5,5'-bis-(9-naphthalen-1-yl-9H-carbazol-3-yl)-Nasterisk3asterisk,Nasterisk3asterisk,Nasterisk3'asterisk,Nasterisk3'asterisk-tetraphenyl-biphenyl-3,3'-diamine.    EXAMPLE - 3-Bromo-N,N-diphenyl-5-(9-phenyl-9H-carbazol-3-yl)aniline, N,N-diphenyl-3-(9-phenyl-9H-carbazol-3-yl)-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)aniline, tetrakis(triphenylphosphine)palladium, and sodium hydroxide were added to tetrahydrofuran and distilled water, and refluxed for 12 hours at 90 degrees C. The reaction mixture was extracted, the organic layer was filtered and dried, and the residue was purified to obtain Nasterisk3asterisk,Nasterisk3asterisk,Nasterisk3'asterisk,Nasterisk3'asterisk-tetraphenyl-5,5'-bis-(9-phenyl-9H-carbazol-3-yl)-biphenyl-3,3'-diamine with the yield of 53%.