TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Layer: The organic thin film layer is light emitting layer. Preferred Definitions:    Ar11=optionally substituted 5-50C heterocyclic group, phenyl, 6-30C aryl, 10-50C condensed aryl (all optionally substituted), preferably 9-phenanthrenyl group, 2-naphthyl, 1-naphthyl, fluoranthenyl and pyrenyl (all optionally substituted);    Ra,Rb=phenyl, naphthyl or fluorenyl (all optionally substituted);    Ar1-Ar4=phenyl, naphthyl, fluorenyl or dibenzofuranyl (all optionally substituted), where at least one of Ar1-Ar4 is optionally substituted fluorenyl;and    R21-R24=phenyl, methyl, ethyl, isopropyl, tert-butyl, cyclopropyl, cyclopentyl, cyclohexyl and trimethylsilyl (all optionally substituted), or cyano.    SPECIFIC COMPOUNDS - 152 Diaminopyrene derivatives are disclosed. E.g. 1-N,1-N,3,6-N,6-N,8-hexaphenylpyrene-1,6-diamine of formula (A), 1-N,1-N,6-N,6-N-tetrakis(3-methylphenyl)-3,8-diphenylpyrene-1,6-diamine, 1-N-(4-ethylphenyl)-1-N,3,6-N,8-tetraphenyl-6-N-(4-(propan-2-yl)phenyl)pyrene-1,6-diamine, 1-N-(4-tert-butylphenyl)-1-N,3,6-N,8-tetraphenyl-6-N-(4-(propan-2-yl)phenyl)pyrene-1,6-diamine and 1-N,1-N,6-N,6-N-tetrakis(3,4-dimethylphenyl)-3,8-diphenylpyrene-1,6-diamine. 522 Anthracene derivatives are disclosed. E.g. 1,5-bis(naphthalen-1-yl)-9,10-diphenylanthracene, 1-(1,5-bis(naphthalen-1-yl)-10-(pyren-4-yl)anthracen-9-yl)pyrene, 3-(10-(fluoranthen-3-yl)-1,5-bis(naphthalen-1-yl)anthracen-9-yl)fluoranthene, 2-(1,5-bis(naphthalen-1-yl)-10-(triphenylen-2-yl)anthracen-9-yl)triphenylene and 9,10-bis(naphthalen-2-yl)-2,6-diphenylanthracene of formula (B).    EXAMPLE - 2-Amino-9,9-dimethyl fluorene (in g) (7.66), tris-di-benzylideneacetone dipalladium (0.25), 2,2'-bis(diphenylphosphino)-1,1'-binaphthyl (0.35) and sodium tert-butoxide (3.61) were mixed. Then, toluene (30 ml) and 3,4,5-trimethyl bromobenzene (3.74) were added to resulting solution, filtered and dried to obtain N-(9,9-dimethyl-9H-fluoren-2-yl)-N-(3,4,5-trimethylphenyl)amine. Then, obtained N-(9,9-dimethyl-9H-fluoren-2-yl)-N-(3,4,5-trimethylphenyl)amine (3.7), 1,6-dibromo-3,8-di(2'-naphthyl)pyrene (3.1), palladium acetate (0.11), sodium tert-butoxide (0.98), toluene (60 ml) and tri(t-butyl)phosphine (0.1) were mixed and reacted at 80 degrees C for 8 hours, filtered, washed and dried to obtain diaminopyrene derivative. An organic light emission medium was obtained using obtained diaminopyrene derivative and 9,10-bis(naphthalen-2-yl)-2,6-diphenylanthracene.