NOVELTY - Fluorene compound (I), is new.    USE - Fluorene compound for use in formulation for electronic device selected from 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, organic laser diodes or organic electroluminescent devices, and for use as hole transporting material in a hole-transport or hole-injection layer or as an electron blocking layer, as an emitter for fluorescent emission layers or as matrix material in an emitting layer (all claimed).    ADVANTAGE - The fluorene compound significantly improves organic electroluminescent device performance, particularly service life, efficiency and operating voltage, and shows a high thermal stability without decomposition and residue sublimate.    DETAILED DESCRIPTION - Fluorene compound of formula (I), is new.    Ar3=same or different 6-60C aromatic or heteroaromatic ring system, which may be substituted with one or multiple R7 radicals or connected with Ar1 or Ar2 group with E;    Ar1 and Ar2=same or different 6-60C aromatic or heteroaromatic ring system, which is substituted with one or multiple R7 group;    E=same or different C(R7)2, O, S or NR7 group;    R1-R6=same or different H, D, F, Cl, Br, I, CN, Si(R9)3 group, a straight-chain 1-40C alkyl, alkoxy or thioalkyl group or 3-40C branched or cyclic alkyl, alkoxy or thioalkyl group, which may be substituted by one or multiple R9 radicals, CH2, Si(R9)2, C=NR9, P(=O)(R9), SO, SO2, NR9, O, S or CONR9 group;    R9=5-60C aryloxy group or heteroaryloxy group;    R7=form a mono- or polycyclic, aliphatic or aromatic ring system with one or multiple R9 radicals;    R8=H, D, F, Cl, Br, I, CN, Si(R9)3, 1-40C straight-chain alkyl, alkoxy or thioalkyl group, 3-40C branched or cyclic alkyl, alkoxy or thioalkyl group;    R10=selected from H, D, F, 1-20C aliphatic hydrocarbon radical or 6-30C an aromatic ring system, in which one or multiple H atoms may be replaced by D or F;    i, s, t, u and m=0-2; and    n, o, p, q and r=0-4.    An INDEPENDENT CLAIM is included for a method for preparing fluorene compound of formula (I).