NOVELTY - Substituted benz(a)anthracene derivatives (Q) are new, where (Q) excludes 8-phenyl-benzo(a)anthracene, 7,8-di-naphthalen-1-yl-benzo(a)anthracene, 8-naphthalen-1-yl-benzo(a)anthracene, 7,11-di-naphthalen-1-yl-benzo(a)anthracene, 9-phenyl-benzo(a)anthracene, 11-naphthalen-1-yl-benzo(a)anthracene, 9-(2,6-dimethyl-phenyl)-benzo(a)anthracene and 9-(2,5-dimethyl-phenyl)-benzo(a)anthracene.    USE - (Q1) is useful for the preparation of (Q). (Q) is useful: in electronic devices, preferably electroluminescent device, which is organic-LED, polymeric LED, organic field-effect transistors, organic thin-film transistors, organic light-emitting transistors, organic integrated circuit, organic solar cell, organic field-quench devices, light-emitting electrochemical cell, organic laser diode or organic photoreceptors; and as host material for fluorescent dopants, where the fluorescent dopants are monostyrylamine, distyrylamine, tristyrylamine, tetrastyrylamine, styrylphosphine, styrylether, arylamine, preferably arylamine containing condensed aromatic group or condensed aromatic hydrocarbons, an emitting dopant, hole transport material, hole injection material or electron transport material (all claimed).    ADVANTAGE - (I): exhibit high thermal stability; and provide electronic devices with high quality and durability.    DETAILED DESCRIPTION - Substituted benz(a)anthracene derivatives (Q) of formula (I) and (II) are new, where (Q) excludes 8-phenyl-benzo(a)anthracene, 7,8-di-naphthalen-1-yl-benzo(a)anthracene, 8-naphthalen-1-yl-benzo(a)anthracene, 7,11-di-naphthalen-1-yl-benzo(a)anthracene, 9-phenyl-benzo(a)anthracene, 11-naphthalen-1-yl-benzo(a)anthracene, 9-(2,6-dimethyl-phenyl)-benzo(a)anthracene and 9-(2,5-dimethyl-phenyl)-benzo(a)anthracene.    Ar1 = a bivalent mono- or polycyclic (hetero)aryl ring system with 5-40 aromatic ring atoms (optionally substituted by R);    X, Y1 = a mono-, bi-, tri-, tetra-, penta- or hexa-valent mono- or polycyclic (hetero)aryl ring system with 5-40 aromatic ring atoms (optionally substituted by R), N(Ar2)2 (when p and q are 0), or a single bond, C=O, O, S, SO2, NR1, Ar2, (P=O)Ar2, OB(Ar2)-O, OBR1-O, 1-20C-alkylene or alkylidene (optionally substituted by R1) (when p and q are 1, where one or more non-adjacent CH2 groups are optionally replaced by R1C=CR1, C?=C, Si(R1)2, Ge(R1)2, Sn(R1)2, C=O, C=S, C=Se, C=NR1, P(=O)(R1), SO, SO2, NR1, O, S or CONR1 and one or more H atoms are replaced by D, F, Cl, Br, I, ON or NO2), or N or P=O (when p and q are 2);    R = 1-40C-alkyl, 1-40C-alkoxy, 1-40C-thioalkyl, cyclic 3-40C-alkyl, 3-40C-alkoxy, 3-40C-thioalkyl, 2-40C-alkenyl (all optionally substituted by R1, where one or more non-adjacent CH2 group are optionally replaced by R1C=CR1, C?=C, Si(R1)2, Ge(R1)2, Sn(R1)2, C=O, C=S, C=Se, C=NR1, P(=O)(R1), SO, SO2, NR1, O, S or CONR1 and one or more H atoms are replaced by D, F, Cl, Br, I, CN or NO2), a mono- or polycyclic (hetero)aryl ring system with 5-60 aromatic ring atoms (optionally substituted by non-aromatic residue R), (hetero)aryloxy with 5-60 aromatic ring atoms (optionally substituted by non-aromatic R), H, D, F, Cl, Br, I, CHO, N(R1)2, N(Ar2)2, C(=O)Ar2, P(=O)(Ar2)2, S(=O)Ar2, S(=O)2Ar2, CR1=CR1Ar2, ON, NO2, Si(R1)3, B(OAr2)2, B(OR1)2, OSO2R1 or OH, where two or more adjacent R together forms a bivalent or polyvalent aliphatic unit; either    Ar2 = a mono- or polycyclic (hetero)aryl ring system with 5-30 aromatic ring atoms (optionally substituted by non-aromatic residue R); or    2Ar2N, 2Ar2NP = a single bond or a bridge comprising B(R1), C(R1)2, Si(R1)2, C=O, C=NR1, C=C(R1)2, O, S, S=O, SO2, N(R1), P(R1) or P(=O)R1; either    R1 = H, D or an aliphatic or (hetero)aryl 1-20C-hydrocarbon, in which one or more H atoms are replaced by F; or    2R1 = a mono- or polycyclic aliphatic or aromatic ring system;    k, l, m, n = 0 or 1; and    p, q = 0-4.    Where the group Ar1, X and/or Y1 are respectively bonded to 8, 9 or 11 positions of the benz(a)anthracene and correspondingly there is no residue R bonded at this position. INDEPENDENT CLAIMS are included for:    (1) the preparation of (Q);    (2) substituted benz(a)anthracene derivatives (Q1) of formula (Q1a) or (Q1b), where (Q1) excludes 8-bromo-7,12-bis-iodomethyl-benzo(a)anthracene, 8-bromo-7,12-dimethyl-benzo(a)anthracene, acetic acid 8-bromo-benzo(a)anthracen-7-yl ester, 8-chloro-7-methyl-benzo(a)anthracene, 8,10-dichloro-9,11-difluoro-benzo(a)anthracene, 8,10-dichloro-9,11-difluoro-7,12-dimethyl-benzo(a)anthracene, 9-bromo-benzo(a)anthracene, 9-bromo-7,12-dimethyl-benzo(a)anthracene, 9-chloro-benzo(a)anthracene, 9-chloro-7-methyl-benzo(a)anthracene, 11-bromo-7-methyl-benzo(a)anthracene, 7,11-dibromo-benzo(a)anthracene, acetic acid 11-bromo-benzo(a)anthracen-12-yl ester, 9,11-dichloro-benzo(a)anthracene, 9,11-dichloro-8,10-difluoro-benzo(a)anthracene and 9,11-dichloro-8,10-difluoro-7,12-dimethyl-benzo(a)anthracene;    (3) an oligomer, polymer or dendrimer containing (Q), where R, R2, Ar1, X and/or Y1 of (Q) is bonded to the oligomer, polymer or dendrimer;    (4) use of (Q), (Q1) and oligomers, polymers or dendrimers in electronic devices, preferably electroluminescent device; and    (5) a solution or formulation comprising (Q) and at least a solvent.    R3, R4 = Cl, Br, I, B(OR1)2 or B(OAr2)2.    Where R3 is bonded to 8, 9 or 11 position of the benz(a)anthracene and correspondingly to this position no group R is bonded.