NOVELTY - Benzo(c)phenanthrene derivatives (I) are new.    USE - (I) or the oligomers, polymers or dendrimers are useful: in electronic devices, preferably organic electroluminescent devices comprising organic field-effect transistors, organic thin film transistors, organic light-emitting transistors, organic integrated circuits, organic solar cells, organic field-quench devices, light-emitting electrochemical cells, organic laser diodes and organic photoreceptors; and as emitting materials (dopants), host materials for fluorescent or phosphorescent dopants, hole transport materials, hole injection materials, electron transport materials in organic electroluminescent devices (all claimed).    ADVANTAGE - (I) exhibits high thermal stability and high glass transition temperature and thus undergoes sublimation without decomposition. The electroluminescent device comprising (I) exhibits high efficiency and long life.    DETAILED DESCRIPTION - Benzo(c)phenanthrene derivatives of formula (I) are new.    Either R2-R11 = A1, N(A1)2, H, D, halo, CHO, N(R13)2, C(=O)A1, P(=O)(A1)2, S(=O)A1, S(=O)2A1, CR13=CR13A1, CN, NO2, Si(R13)3, B(OR13)2, OSO2R13, straight chain 1-40C alkyl, 1-40C alkenyl, 1-40C alkoxy or 1-40C thioalkoxy, branched, mono- or polycyclic 3-40C alkyl, 3-40C alkenyl, 3-40C alkoxy or 3-40C thioalkoxy (optionally substituted by at least one residue R13), where at least one non adjacent CH2 can be replaced by T1, and at least one H can be replaced by T2, aromatic or heteroaromatic ring with 5-40 aromatic ring atoms (optionally substituted by at least one residue R13), and/or aryloxy or heteroaryloxy with 5-40 aromatic ring atoms (optionally substituted by at least one residue R13); or    R2R11 = mono- or polycyclic, aliphatic or aromatic ring;    T1 = R13C=CR13, CC, Si(R13)2, Ge(R13)2, Sn(R13)2, C=O, C=S, C=Se, C=NR13, P(=O)(R13), SO, SO2, NR13, O, S or CONR13;    T2 = D, halo, CN or NO2;    A1 = aromatic or heteroaromatic ring with 5-40 aromatic ring atoms (optionally substituted by at least one residue R13), where two A1 binds to same N or P and two A1 can be linked with each other by covalent single bond or bivalent group T3;    T3 = BR13, C(R13)2, Si(R13)2, C=O, C=NR13, C=C(R13)2, O, S, S=O, SO2, NR13, PR13 or P(=O)R13; either    R1, R12 = H or D; or    R1R12 = bivalent group T3; either    R13 = H, D, halo, CHO, N(R14)2, CN, NO2, Si(R14)3, B(OR14)2, OSO2R14, straight chain 1-40C alkyl, 1-40C alkenyl, 1-40C alkoxy or 1-40C thioalkoxy, branched, mono- or polycyclic 3-40C alkyl, 3-40C alkenyl, 3-40C alkoxy or 3-40C thioalkoxy (optionally substituted by at least one residue R14), where at least one non adjacent CH2 can be replaced by T4, and at least one H can be replaced by T2, aromatic or heteroaromatic ring with 5-40 aromatic ring atoms (optionally substituted by at least one residue R14) and/or aryloxy or heteroaryloxy with 5-40 aromatic ring atoms (optionally substituted by at least one residue R14); or    two R13 = mono- or polycyclic, aliphatic or aromatic ring;    T4 = R14C=CR14, CC, Si(R14)2, Ge(R14)2, Sn(R14)2, C=O, C=S, C=Se, C=NR14, P(=O)(R14), SO, SO2, NR14, O, S or CONR14; either    R14 = H, aliphatic 1-20C hydrocarbon (at least one H can be replaced by F); or    two R14 = mono- or polycyclic ring.    Provided that: at least one group in R2-R11 is A1, N(A1)2, P(A1)2, P(=O)A12 or C(=O)A1; A1 when directly bonded to aromatic backbone of (I), is different from triarylamine; (I) does not comprise 2-phenyl-benzo(c)phenanthrene, 2-(2-chloro-phenyl)-benzo(c)phenanthrene, 2-(2,6-dichloro-phenyl)-benzo(c)phenanthrene, 5,6-diphenyl-benzo(c)phenanthrene, 2-phenyl-benzo(c)phenanthren-4-ol, 6-phenyl-benzo(c)phenanthrene, 22-(tetracyclo(8.8.0.0(2,7).0(13,18))octadeca-1,3,5,7,9,11,13,15,17-nonaen-4- yl)octacyclo(22.6.2.0(2,19).0(3,16).0(4,13).0(5,10).0(21,31).0(28,32))dotriaconta-1,3,5,7,9,11,13,15,17,19,21,23,25,27,29,31-hexadecaene, 3-Phenyl-benzo(c)phenanthrene and 1,3,5-tri(benzo(c)phenanthren-5-yl)benzene. INDEPENDENT CLAIMS are also included for    (1) an oligomer, polymer or dendrimer comprising (I) (where R1-R12 does not comprise A1, N(A1)2, P(A1)2, P(=O)A12 or C(=O)A1 and represents a bond to the polymer, oligomer or dendrimer or one of the residues of R1-R12 additionally exhibits a bond to the polymer, oligomer or dendrimer; and    (2) preparation of (I).