TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: The organic layer is light-emitting layer, comprising (I) as fluorescent or phosphorescent host material. The organic layer further comprises hole injection layer, hole-transport layer, hole blocking layer and electron-transport layer.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (Claimed): The preparation of (A) comprises performing Suzuki coupling and aryl amination of 4,9-dibromo-pyrene to obtain p-substituted 4-bromo-pyrene compound of formula (III), performing Suzuki coupling of (III) with 3-halo-phenylboronic acid compounds of formula (IV), preferably 3-bromo-phenylboronic acid to obtain 4-(3-bromo-phenyl)-pyrene compounds of formula (V), and performing aryl amination of (V) to obtain 3-pyren-4-yl-phenylamine compounds of formula (VI) (a representative of (I)).A3 = 5-50C aryl or 5-50C heteroaryl or amino (optionally substituted);A4, A5 = 5-50C aryl or 5-50C heteroaryl; andX3 = Cl, Br or I. Preferred Definitions:    A1 = phenyl (optionally substituted), naphthyl, anthranyl, pyrenyl, perylenyl, pentacenyl, biphenylyl, terphenylyl, fluorenyl, phenylfluorenyl, dimethylfluorenyl, spiro-fluorenyl or phenylcarbazolyl group;    X1 = phenyl (optionally substituted), biphenylyl, naphthyl, phenylcarbazolyl, diphenylfluorenyl, quinolyl, spiro-fluorenyl or diphenylbenzimidazolyl;    Y1, Y2 = phenyl, naphthyl or biphenylyl;    A2 = phenyl, naphthyl, anthranyl, pyrenyl, perylenyl, pentacenyl, biphenylyl, terphenylyl, fluorenyl, phenylfluorenyl, dimethylfluorenyl or phenylcarbazolyl group;    Y3, Y4 = phenyl (optionally substituted), naphthyl, biphenylyl, pyrazolyl, carbazolyl; and    Y5, Y6 = phenyl, naphthyl or biphenylyl.    SPECIFIC COMPOUNDS - 14 Compounds (A) are specifically claimed, e.g. naphthalen-1-yl-naphthalen-2-yl-(3-(9-naphthalen-1-yl-pyren-4-yl)-phenyl)-amine (Ia), N-(3-(9-(9,9'-spirobi(fluorene)-2-yl)pyren-4-yl)phenyl)-N-(biphenyl-4-yl)naphthalen-2-amine, (3-(9-(4-tert-butyl-phenyl)-pyren-4-yl)-phenyl)-naphthalen-2-yl-phenyl-amine, naphthalen-1-yl-naphthalen-2-yl-(9-(3-(naphthalen-1-yl-naphthalen-2-yl-amino)-phenyl)-pyren-4-yl)-amine and naphthalen-1-yl-(9-(3-(naphthalen-1-yl-naphthalen-2-yl-amino)-phenyl)-pyren-4-yl)-phenyl-amine.    EXAMPLE - 2 g 4-Bromo-9-(naphthalen-1-yl)-1,6-dihydropyrene, 1.23 g 3-bromophenyl boronic acid and 0.28 g tetrakis(triphenylphosphine)palladium(0) were mixed with 5.18 g aqueous sodium carbonate and 100 ml anhydrous dimethylformamide under nitrogen atmosphere and stirred under reflux condition at 110 degrees C for 24 hours and then worked up and 1.07 g 4-(3-bromophenyl)-1,6-dihydro-9-(naphthalen-1-yl)pyrene was obtained. 1 g 4-(3-Bromophenyl)-1,6-dihydro-9-(naphthalen-1-yl)pyrene, 0.67 g N-(naphthalen-6-yl)naphthalen-1-amine, 0.093 g tris(dibenzylideneacetone)dipalladium(0), 0.99 g sodium butoxide, 0.05 ml tri-tert-butylphosphine and 30 ml anhydrous toluene were reacted under nitrogen atmosphere under reflux condition at 110 degrees C 24 hours and the reaction solution was worked up to obtain 0.85 g naphthalen-1-yl-naphthalen-2-yl-(3-(9-naphthalen-1-yl-pyren-4-yl)-phenyl)-amine (Ia).