NOVELTY - Substituted pyridine containing polycyclic compounds (I) are new.    USE - (I) are useful in an oligomer, polymer or dendrimer or at least one composition which is useful: as a hole injection material, hole transport material, hole-blocking material, electron injection material, electron-blocking material and/or emitter material, in an electronic device; as emitting compound and/or as a matrix material in at least one emitting layer, preferably in combination with a further matrix material and/or a further emitting compound; as the electron conductive compound in at least one electron-conducting layer; and as hole-conducting compound in at least one hole-conducting layer, where the electronic device is organic electroluminescent devices, organic laser diodes, organic light-emitting transistors, organic LEDs, organic light-emitting electrochemical cells, organic integrated circuits, organic FETs, organic thin film transistors, organic solar cells, organic optical detectors, organic photoreceptors or organic field-quench devices (all claimed).    ADVANTAGE - (I): provide improved properties including efficiency, operating voltage, service life, color coordinates and/or color purity, for devices; are easy to process; exhibit good solubility, very high stability, excellent thermal stability, and excellent glass film formation; and provide devices in a cost effective manner with an excellent performance and consistent quality.    DETAILED DESCRIPTION - Substituted pyridine containing polycyclic compounds (I) of formulae (II) and (III) are new.    Either E1 = divalent bridge; or    C+E1 = 5- or 6-membered ring;    Y1 = divalent bridge comprising O, S, C(R1)2, C(R1)=CR1, N(R1), B(R1), Si(R1)2, C(=O), C(=NR1), C=C(R1)2, S(=O), SO2, C(R1)2-C(R1)2, P(R1) or P(=O)R1; either    R1 = 1-20C straight chain alkyl, 1-20C straight chain alkoxy, 1-20C straight chain thioalkoxy, 2-20C alkenyl, 2-20C alkynyl, 3-20C branched or cyclic alkyl, 3-20C branched or cyclic alkoxy, 3-20C branched or cyclic thioalkoxy (all optionally substituted by at least one R11, where at least one nonadjacent CH2 group is optionally replaced by R1C=CR1, CC, Si(R11)2, C(O), NR11, O, S or COR1, and at least one H is optionally replaced by D, F, Cl, Br, I or CN), diaryl, diheteroarylamino, arylheteroarylamino (all having 10-40 aromatic ring atoms and all optionally substituted by at least one R11), aromatic or heteroaromatic rings (both having 5-60 aromatic ring atoms and both optionally substituted by at least one R11), aryloxy, heteroaryloxy (both having 5-40 aromatic ring atoms and both optionally substituted by at least one R11), aralkyl, heteroaralkyl (having 5-40 aromatic ring atoms and both optionally substituted by at least one R11), H, D, F, Cl, Br, I, N(R11)2, CN, NO2, OH, COOH, C(=O)N(R11)2, Si(R11)3, B(OR11)2, C(=O)R11, P(=O)(R11)2, S(=O)R11, S(=O)2R11 or OSO2R11; or    R1+R1 = mono- or poly- cyclic, aliphatic, aromatic or heteroaromatic ring system; either    R11 = 1-20C straight chain alkyl, 1-20C straight chain alkoxy, 1-20C straight chain thioalkoxy, 2-20C alkenyl, 2-20C alkynyl, 3-20C branched or cyclic alkyl, 3-20C branched or cyclic alkoxy, 3-20C branched or cyclic thioalkoxy (all optionally substituted by at least one R2, where at least one nonadjacent CH2 is optionally replaced by R2C=CR2, CC, Si(R2)2, C=O, NR2, O, S or CONR2, and at least one H is optionally replaced by D, F, Cl, Br, I, CN or NO2), diarylamino, diheteroarylamino, arylheteroarylamino (all having 10-40 aromatic ring atoms and all optionally substituted by at least one R2), aromatic or heteroaromatic rings (both having 5-60 aromatic ring atoms and both optionally substituted by at least one R2), aryloxy, heteroaryloxy (both having 5-40 aromatic ring atoms and both optionally substituted by at least one R2), aralkyl, heteroaralkyl (both having 5-40 aromatic ring atoms and both optionally substituted by at least one R2), H, D, F, Cl, Br, I, N(R2)2, CN, NO2, Si(R2)3, B(OR2)2, C(=O)R2, P(=O)(R2)2, S(=O)R2, S(=O)2R2 or OSO2R2; or    R11+R11 = mono- or poly- cyclic, aliphatic, aromatic or heteroaromatic ring system; either    R2 = aliphatic, aromatic and/or heteroaromatic hydrocarbyl having 1-20C (where at least one H may be replaced by F), H, D or F; or    R2+R2 = mono- or poly- cyclic, aliphatic ring system; and    X1 = CR1 or N.    INDEPENDENT CLAIMS are also included for:    (1) an oligomer, dendrimer or polymer comprising at least one of (I), where at least one bond from (I) to the polymer, oligomer or dendrimer is present;    (2) a composition comprising at least one of (I) and/or oligomer, polymer or dendrimer, and at least one further organic functional material comprising fluorescent emitters, phosphorescent emitters, host materials, matrix materials, electron transport materials, electron injection materials, hole conductor materials, hole injection materials, electron-blocking materials or hole-blocking materials;    (3) a formulation comprising at least one of (I), an oligomer, polymer or dendrimer and/or at least one of the compositions and at least one solvent; and    (4) preparing (I).