NOVELTY - A pyrenylamine derivative (I), is new.    USE - New pyrenylamine derivative is used for forming light-emitting layer material e.g. fluorescent blue dopant material of organic electroluminescence devices for electronic apparatus e.g. organic integrated circuits, organic field-effect transistors, organic thin film transistors, organic light-emitting transistors, organic solar cells, organic optical detectors, organic photoreceptors, organic field-quench devices, light-emitting electrochemical cells, organic laser diodes and organic light-emitting diodes (all claimed).    ADVANTAGE - The pyrenylamine derivative provides organic electroluminescent device with excellent luminous efficiency, luminescent brightness, high chromatic purity and improved lifetime.    DETAILED DESCRIPTION - A pyrenylamine derivative of formula (I), is new.    Ar1,Ar2=phenyl, pyridyl, pyrimidyl, triazinyl or naphthyl (all optionally substituted by 1-10C alkyl,3-10C cycloalkyl or 1-10C alkoxy (all optionally substituted), H, D, halo, CN, Si(CH3)3, CF3 or nitro);    or Ar1+Ar2=3-5C cycloalkyl;    or Ar1+Ar2+C=spiro structure;    R1-R4=1-40C alkyl, 5-40C aryl, 4-40C heteroaryl, 3-40C cycloalkyl or heterocycloalkyl 3-40C alkyl (all optionally substituted by D, halo, CN, Si(CH3)3, CF3, nitro, optionally substituted 1-10C alkyl, optionally substituted 3-10C cycloalkyl or optionally substituted 1-10C alkoxy), H, D, halo, CN, Si(CH3)3, CF3 or nitro;    Z=1-5C alkyl or 2-5C alkenyl (both optionally substituted by 1-40C alkyl, 5-40C aryl, 4-40C heteroaryl or 3-40C cycloalkyl), single bond, Si(CH3)2 or 2-amino;    R5,R6=1-40C alkyl, 2-40C alkenyl, 5-40C aryl, 6-40C arylalkyl, 5-40C heteroaryl, 3-40C cycloalkyl or 3-40C heterocycloalkyl (all optionally substituted by H, halo, CN, Si(CH3)3, CF3, nitro, optionally substituted 1-10C alkyl, optionally substituted 3-10C cycloalkyl, optionally substituted 1-10C alkoxy, phenyl, pyridyl, pyridinyl, naphthyl, dibenzo furanoid, dibenzo thiophenyl or anthracenyl (all optionally substituted by 10-10C alkyl));    or hetero atom of R5+C or R6+C adjacent to linker attached through pyrenyl structure X or R5+R6+C+X=single bond, 1-40C alkyl, 5-40C aryl, optionally substituted 5-40C heteroaryl optionally substituted fused 5-6-membered ring;    X=N(Y1) or C(Y2)(Y3);and    Y1-Y3=H, 1-10C alkyl, 5-10C aryl, hetero atom, heteroaryl, heteroalkyl, heteroarylene or heteroalkylene (in which hetero atom is chosen from N, O, S, Se and Si).