NOVELTY - Boron-containing compounds containing bicyclic structural units (I) or (II), are new.    USE - The boron-containing compounds are useful in an electronic device as a hole-blocking material, electron injection material, and/or electron transport material (claimed).    ADVANTAGE - The boron-containing compounds: exhibit operating voltage, improved durability, good solubility and film formation; and can be produced in a simple and cost efficient manner.    DETAILED DESCRIPTION - Boron-containing compounds containing bicyclic structural units of formula (I) or (II), are new.    X1-X16 = N, CR2 or C-Z, where at least one X1-X16 is C-Z, and two adjacent X1-X16 is not N;    Y1, Y2 = bond or divalent bridge comprising BR3, O, S, C(R3)2, C(R3)=C(R3), N(R3), Si(R3)2, C=O, C=C(R3)2, S=O, SO2, C(R3)2, C(R3)2 or 1,2-phenylene; either    R1-R3 = straight chain 1-40C alkyl, 1-40C alkoxy, 1-40C thioalkoxy, branched or cyclic 3-40C alkyl, 3-40C alkoxy, 3-40C thioalkoxy (which are respectively substituted by R1, where at least one non-adjacent CH2- is replaced by R4C=CR4, C=C, Si(R4)2, Ge(R4)2, Sn(R4)2, C=O, C=S, C=Se, P(=O)(R4), SO, SO2, O, S or CONR4 and at least one H- is replaced by D, F, Cl, Br, I, CN or NO2), H, D, F, Cl, Br, I, CHO, C(=O)Ar1, P(=O)(Ar1)2, S(=O)Ar1, S(=O)2Ar1, CN, NO2, Si(R4)3, B(OR4)2, OSO2R4, aromatic or heteroaromatic ring system with 5-40 aromatic ring atoms which is substituted with R4, aryloxy- or heteroaryloxy with 5-40 aromatic ring atoms which is substituted with R4; or    R1+R2+R3 = mono- or polycyclic, aliphatic or aromatic ring system; either    R4 = straight chain 1-40C alkyl, 1-40C alkoxy, 1-40C thioalkoxy, branched or cyclic 3-40C alkyl, 3-40C alkoxy, 3-40C thioalkoxy (which are respectively substituted with R5, where at least one non-adjacent CH2- is replaced by R5C=CR5, C=C, Si(R5)2, Ge(R5)2, Sn(R5)2, C=O, C=S, C=Se, P(=O)(R5), SO, SO2, O, S or CONR5 and at least one H- is replaced by D, F, Cl, Br, I, CN or NO2), H, D, F, Cl, Br, I, CHO, C(=O)Ar1, P(=O)(Ar1)2, S(=O)Ar1, S(=O)2Ar1, CN, NO2, Si(R5)3, B(OR5)2, OSO2R5; or    2R4 = mono- or polycyclic, aliphatic or aromatic ring system;    Ar1 = aromatic or heteroaromatic ring system with 5-30 aromatic ring atoms which are substituted with R3, where two Ar1 which bind to the same phosphorus, are bonded together through single bond or bridge comprising B(R5)C(R5)2, Si(R5)2, C=O, C=NR5, C=C(R5)2, O, S, S=O, SO2, N(R5), P(R5) or P(=O)R5; either    R5 = H, D, F, an aliphatic, aromatic and/or heteroaromatic 1-20C hydrocarbon, in which H is replaced by F; or    2R5 = mono- or polycyclic, aliphatic or aromatic ring system;    Z = -(Ar4)q-B1(Ar2)Ar3;    Ar2, Ar3 = aromatic or heteroaromatic ring system with 5-30 aromatic ring atoms which are substituted with R3, where Ar2 and Ar3 are linked together through single bond or bridge comprising B(R5)C(R5)2, Si(R5)2, C=O, C=NR5, C=C(R5)2, O, S, S=O, SO2, N(R5), P(R5) or P(=O)R5;    q = 0 or 1; and    Ar4 = 6-40C aryl group or 3-40C heteroaryl which is substituted by R3.    INDEPENDENT CLAIMS are also included for:    (1) a composition comprising the boron-containing compounds and at least one further compound comprising injection materials made of fluorescent emitters, phosphorescent emitters, host materials, matrix materials, electron transport materials, electron injection materials, hole transport materials, electron blocking materials or hole-blocking materials;    (2) a formulation comprising the boron-containing compounds, or the composition and at least one solvent;    (3) the preparation of the boron-containing compounds; and    (4) an electronic device comprising the boron-containing compounds or the composition, where the electronic device comprises organic electroluminescent devices, 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 or organic laser diodes.