TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Compounds: The anthracene derivative is preferably of formula (2-6). Alternately, the organic light emitting medium contains diaminopyrene derivative of formula (1') and an anthracene derivative of formula (2'), which is preferably of formula (2-6)'.Ar5,Ar6=6-50C aryl, 5-50C heterocyclic group, 1-50C alkyl, 3-50C cycloalkyl, 1-50C alkoxy or 7-50C aralkyl, preferably optionally substituted phenyl or optionally substituted 10-20C aryl;R21'-R24'=H, 3-20C silyl or R21, preferably H and group chosen from phenyl, methyl, isopropyl, t-butyl, cyclohexyl and trimethylsilyl, each optionally having substituent;n1'-n4'=1-5;Ra',Rb'=optionally substituted 6-50C aryl, preferably naphthyl or phenyl;Ar11',Ar12'=6-50C optionally substituted aryl or 5-50C optionally substituted heterocyclic group, preferably optionally substituted 2-naphthyl, 9-phenanthrenyl, fluoranthenyl or 1-naphthyl;andR1'-R8'=H, group chosen from 5-50C heterocyclic group, 1-50C alkyl, 3-50C cycloalkyl, 7-50C aralkyl, 6-50C aryloxy, 6-50C arylthio, alkoxycarbonyl and silyl, each optionally having substituent, carboxy, halo, cyano, nitro or 2-50C optionally substituted hydroxy. Preferred Definitions:    Ar11,Ar12=optionally substituted 2-naphthyl, 9-phenanthrenyl or 1-naphthyl;and    R1-R8=H.    SPECIFIC COMPOUNDS - 171 Anthracene compounds, such as 9,10-bis(phenanthren-9-yl)anthracene compound of formula (EM1), 9,10-bis(naphthalen-2-yl)anthracene, 9,10-bis(naphthalen-1-yl)anthracene, 9-(naphthalen-1-yl)-10-(naphthalen-2-yl)anthracene and 9-(naphthalen-1-yl)-10-(2-phenylphenyl)anthracene, and 135 diaminopyrene compounds, such as 3,8-dimethyl-1-N,1-N,6-N,6-N-tetraphenylpyrene-1,6-diamine compound of formula (DM-1-1), 3,8-dimethyl-1-N,6-N-bis(3-methylphenyl)-1-N,6-N-diphenylpyrene-1,6-diamine, 3,8-dimethyl-1-N,1-N,6-N,6-N-tetrakis(3-methylphenyl)pyrene-1,6-diamine, 1-N,6-N-bis(3,5-dimethylphenyl)-3,8-dimethyl-1-N,6-N-bis(3-methylphenyl)pyrene-1,6-diamine and 3,8-dimethyl-1-N,1-N,6-N,6-N-tetrakis(4-methylphenyl)pyrene-1,6-diamine are disclosed.    EXAMPLE - A glass substrate was cleaned with isopropyl alcohol, and ozone cleaning was carried out for 30 minutes. A substrate holder was installed with glass substrate, and a transparent electrode was formed. A primary and secondary films were sequentially formed using diamine compounds of formulae (A-1,A-2). A host material and a dopant material were formed on film (A-2), and blue light emitting layer was formed. Organic electroluminescent element was formed using light emitting layer. The element had excellent luminous efficiency.