NOVELTY - Substituted pyrene compounds (I), in which pyrene group is optionally substituted by group R1, are new.    USE - (I) are useful as emitting compounds in an emitting layer of electronic devices, preferably organic electroluminescent devices (preferred), 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 and organic laser diodes (all claimed).    ADVANTAGE - (I) exhibit small width of emission band and high temperature stability.    DETAILED DESCRIPTION - Substituted pyrene compounds of formula (I), in which pyrene group is optionally substituted by group R1, are new.    Ar1=(hetero)aromatic ring with 6-30 aromatic ring atoms (optionally substituted by at least one group R3), where at least one Ar1 which is part of N(Ar1)2 is bonded with another Ar1 which is part of another N(Ar1)2, through X, and Ar1 is optionally bonded through X;    X=single bond or divalent group, preferably (hetero)aryl with 6-20 aromatic ring atoms (optionally substituted by at least one group R2), BR2, C(R2)2, -R2C=CR2, C(=O), Si(R2)2, NR2, PR2, P(=O)R2, O, S, S(=O), S(=O)2 or combination of 2, 3, 4 or 5 divalent groups; either    R1=1-20C alkyl or 1-20C alkoxy (both linear) or 3-20C alkyl or 3-20C alkoxy (both branched or cyclic) or 2-20C alkenyl or 2-20C alkynyl (in all groups at least one CH2 group is optionally replaced by -R4C=CR4-, -CC-, Si(R4)2, C=O, C=NR4, -C(=O)O-, -C(=O)NR4-, NR4, P(=O)(R4), -O-, -S-, SO or SO2) or (hetero)aromatic ring with 5-30 aromatic ring atoms (all optionally substituted by at least one group R4), H, D, F, C(=O)R4, CN, Si(R4)3, N(Ar1)2, N(R4)2, P(=O)(R4)2 , OAr1, S(=O)R4 or S(=O)2R4; or    at least 2 R1=ring; either    R2, R3=1-20C alkyl or 1-20C alkoxy (both linear) or 3-20C alkyl or 3-20C alkoxy (both branched or cyclic) or 2-20C alkenyl or 2-20C alkynyl (in all groups at least one CH2 group is optionally replaced by -R4C=CR4-, -CC-, Si(R4)2, C=O, C=NR4, -C(=O)O-, -C(=O)NR4-, NR4, P(=O)(R4), -O-, -S-, SO or SO2) or (hetero)aromatic ring with 5-30 aromatic ring atoms (all optionally substituted by at least one group R4), H, D, F, C(=O)R4, CN, Si(R4)3, N(R4)2, P(=O)(R4)2, S(=O)R4 or S(=O)2R4; or    at least 2 R2=ring; or    at least 2 R3=ring; either    R4=aliphatic or (hetero)aromatic 1-20C organic group (in which at least H is optionally replaced by D or F), H, D or F; or    at least 2 R4=ring.    INDEPENDENT CLAIMS are also included for:    (1) an oligomer, polymer or dendrimer comprising (I) having bonds to the polymer, oligomer or the dendrimer at any positions substituted with the groups R1, R2 and R3, which are optionally localized;    (2) a formulation comprising (I) and at least one solvent; and    (3) preparing (I).