TECHNOLOGY FOCUS - ELECTRONICS - Preferred Component: The organic electroluminescent device consists of an organic layer, which is provided between cathode and anode. The organic layer comprises a host material and the pyrene derivative (I).    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (claimed): The pyrene derivative (I) is prepared by performing bromination of a pyrene derivative, isolating the desired isomer by optionally carrying out separation process, performing a Buchwald-Hartwig coupling reaction with an arylamine, and carrying out a bromination and cyanation of diamino pyrene derivative. Preferred Process: The bromination of the pyrene derivative is carried out, to obtain pyrene-2,7-bis(boronate)ester. Preferred Component: The pyrene derivative (I) is preferably of formula (II), (III), (IV), (V), (VI), or (VII). Preferred Definitions:    n=1;    X=cyanide, or fluorine;and    Y=-N(Ar)2, -P(Ar)2, -OAr, or SAr.    SPECIFIC COMPOUNDS - 50 Pyrene derivatives e.g. 2,7-dicyano-N,N,N,N-tetrakis-(2,4-dimethylphenyl)pyrene-1,6-diamine of formula (VIII), 1,6-bis((2-fluorophenyl)(phenyl)amino)pyrene-2,7-dicarbonitrile, 1-N,1-N,6-N,6-N-tetrakis(2,4-dimethylphenyl)-2,7-difluoropyrene-1,6-diamine, 2,7-difluoro-1-N-(2-methylphenyl)-1-N,6-N,6-N-triphenylpyrene-1,6-diamine, 1-N-(2,4-dimethylphenyl)-2,7-difluoro-1-N,8-N,8-N-tris(4-methylphenyl)pyrene-1,8-diamine, and 1-((9,9-dimethyl-9H-fluoren-2-yl)(2,4-dimethylphenyl)amino)-6-((9,9-dimethyl-9H-fluoren-2-yl)(4-methylphenyl)amino)pyrene-2,7-dicarbonitrile are disclosed.    EXAMPLE - 2,7-Dibromo-N,N,N,N-tetrakis-(2,4-dimethylphenyl)pyrene-1,6-diamine was introduced into dimethylformamide, to obtain a mixture. 5 ml Pyrimidine and 5.16 g copper cyanide were added into the mixture. The reaction mixture was heated under reflux at 150 degrees C for 20 hours, and cooled. 200 ml of 10% Ammonium hydroxide solution, 500 ml heptane, and 100 ml water were added into the cooled mixture, to separate precipitated solid. The precipitated solid was filtered, and dried at 40 degrees C under vacuum. The obtained solid was recrystallized with toluene, and sublimed in vacuum, to obtain the 2,7-dicyano-N,N,N,N-tetrakis-(2,4-dimethylphenyl)pyrene-1,6-diamine as colorless solid, with purity of 99.9%.