NOVELTY - Fused aryl derivatives (I) are new.    USE - The compound (I) is useful in electronic devices, preferably in organic electroluminescent devices, 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 photoreceptors or organic laser diodes. The compound (I) is useful as emitting material or the host-material in an emitting layer or as hole transport or hole injection material in a hole transport- or a hole injection layer or as an electron transport material in an electron transport layer (all claimed).    ADVANTAGE - The sum of pi -electrons of the three aromatic or heteroaromatic groups that are present in the compound (I) and linked with indeno bridges, amounts to at least 28, so that the compound (I) shows good characteristics as blue emitter, and there is no need to include diarylamino substituents, because the unsubstituted compounds already show highly efficient deep-blue emission. The organic electroluminescent devices having the compound (I) shows high durability.    DETAILED DESCRIPTION - Fused aryl derivatives of formula (I) are new.    Either Ar1, Ar2, Ar3 = aryl or heteroaryl having 5-30 aromatic ring atoms, which can be substituted with at least one R1, with the condition that Ar2 is not anthracene; and    X = BR2, C(R2)2, Si(R2)2, C=O, C=NR2, C=C(R2)2, O, S, S=O, SO2, NR2, PR2, P(O)R2 or P(=S)R2; or    Ar1Ar2X, Ar2Ar3X = five or six ring, with the conditions that either all X in (I) are bonded in a five ring or all X in (I) are bonded in a six ring;    either R1, R2 = H, D, F, Cl, Br, I, CHO, CR3=C(R3)2, CN, NO2, Si(R3)3, B(OR3)2, B(R3)2, B(N(R3)2)2, OSO2R3, straight chain alkyl, alkoxy or thioalkoxy having 1-40C or a branched or cyclic alkyl, alkoxy or thioalkoxy having 3-40C (which can be respectively substituted by at least one R3, where at least one non-adjacent CH2 groups can be replaced by R3C=CR3, C?=C, Si(R3)2, Ge(R3)2, Sn(R3)2, C=O, C=S, C=Se, C=NR3, P(=O)R3, SO, SO2, NR3, O, S or CONR3 and at least one H can be replaced by F, Cl, Br, I, CN or NO2) or aromatic and/or heteroaromatic ring system having 5-60 aromatic ring atoms, which can be substituted by at least one R3; or    two or more R1R2 = mono- or polycyclic, aliphatic or aromatic ring system;    R3 = H or aliphatic or aromatic hydrocarbon having 1-20C;    m, n = 0 or 1, with the condition that the sum of m and n is 1; and    p = 1-3.    Where the sum of all pi -electrons of Ar1, Ar2 and/or Ar3 amounts to at least 28, when p is 1, and at least 34, when p is 2, and at least 40, when p is 3. INDEPENDENT CLAIMS are included for:    (1) the production of (I); and    (2) an organic electroluminescent device comprising anodes, cathodes and at least one emitting layer and optionally further layers, which are hole injection layers, hole transport layers, hole blocking layers, electron transport layers, electron injection layers, electron blocking layers, exciton blocking layers, charge-generation layers and/or organic or inorganic p/n- transitions, where the at least one organic layer contains the compound (I).