NOVELTY - A fluorene-containing aromatic compound (I) is new. Compound (I) is not 2-(4-(2-(4-(9H-fluoren-9-yl)-phenyl)-7aH-inden-1-yl)-phenyl)-9,9-diphenyl-9H-fluorene.    USE - New fluorene-containing aromatic compound is used as host material in organic electroluminescent elements (both claimed), and for organic solar cells, organic semiconductor lasers, sensors, organic thin-film transistors, and organic electronic devices.    ADVANTAGE - The new fluorene-containing aromatic compound provides organic electroluminescent elements having high luminous efficiency and low drive voltage. The organic electroluminescent element consumes less power.    DETAILED DESCRIPTION - A fluorene-containing aromatic compound of formula (I), is new. Compound (I) is not 2-(4-(2-(4-(9H-fluoren-9-yl)-phenyl)-7aH-inden-1-yl)-phenyl)-9,9-diphenyl-9H-fluorene.    Nr1=optionally substituted monocyclic nitrogen-containing aromatic ring having 2-5 ring-forming carbon atoms or bicyclic nitrogen-containing aromatic ring having 2-9 ring forming carbon atoms;    Ar=single bond or optionally substituted aromatic ring having 5-40 ring-forming carbon atoms;    Fl1,Fl2=optionally substituted fluorenyl;    p,q,m,n=0-3;    p+q,m+n=1 or more;    Cz1,Cz2=optionally substituted carbazolyl;    Y1,Y2=H, deuterium, fluoro, chloro, bromo, iodo, cyano, or 1-20C linear, branched or cyclic (halo)alkyl, 1-20C linear, branched or cyclic (halo)alkoxy, 1-10C linear, branched or cyclic alkylsilyl, 6-30C arylsilyl, aryl having 6-30 ring-forming carbon atoms, or heteroaryl having 2-10 ring-forming carbon atoms (all optionally substituted);    x,y,k=1-3;    m+p+x=(number of substituents of substitutable Nr1 - 1) or less;    n+q+y=(number of substituents of substitutable Ar - 1) or less;and    L1-L7=single bond, or aromatic ring having 6-30 ring-forming carbon atoms or heteroaromatic ring having 2-30 ring-forming carbon atoms (both optionally substituted).    An INDEPENDENT CLAIM is included for organic electroluminescent element (1) consisting of organic thin film layer(s) (10) comprising a light-emitting layer (5), provided between a cathode (4) and an anode (3). At least one layer contains compound (I).    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the organic electroluminescent element. (Drawing includes non-English language text)    Organic electroluminescent element (1)    Anode (3)    Cathode (4)    Light-emitting layer (5)    Electron injection and transport layer (7)    Organic thin-film layer (10)