NOVELTY - A fluorene derivative (I), is new.    USE - New fluorene derivative is used for composition for organic electroluminescent element used in organic electroluminescent device, organic solar cell, organic photoconductor, organic transistor and monochromatic or white illumination device.    ADVANTAGE - The organic electric device formed using the compound has excellent luminous efficiency, stability and durability.    DETAILED DESCRIPTION - A fluorene derivative of formula (I), is new.    A=group chosen from groups of formulae (Ia) and (Ib);    l=0-3;    m=0-4;    n=2-4;    R1,R2=D, halo, 6-60C aryl, 2-60C heterocyclyl containing O, N, S, Si and/or P, 1-50C alkyl, 2-20C alkenyl, 2-20C alkynyl, 1-30C alkoxy, 6-30C aryloxy, or -L'-N(Ra)(Rb);    or R1+R2=ring;    L'=single bond;    Ra,Rb=6-60C aryl, fluorenyl, 2-60C heterocyclyl containing O, N, S, Si and/or P, -O-Si(R3)3, R3O-Si(R3)2-, 7-60C arylalkyl, 8-60C aryl alkenyl, 3-60C cycloalkyl, or 7-60C aryl alkoxy;    R3=H, 6-20C aryl, 1-20C alkyl, 2-20C alkenyl, 7-20C aryl alkoxy, or 2-20C alkoxy;    L1,L2=single bond, 6-60C aryl, fluorenyl, 2-60C heterocyclyl containing O, N, S, Si and/or P, 1-60C alkylenyl, or 2-60C alkenyl;    Ar1,Ar2,R',R"=H, halo, 6-60C aryl, 2-60C heterocyclyl containing O, N, S, Si and/or P, 1-50C alkyl, 2-20C alkenyl, 2-20C alkynyl, 1-30C alkoxy, 6-30C aryloxy, -L'-N(Ra)(Rb), 6-60C aryl, fluorenyl, 2-60C heterocyclyl containing O, N, S, Si and/or P, -O-Si(R3)3, R3O-Si(R3)2-, 7-60C arylalkyl, 8-60C aryl alkenyl, 3-60C cycloalkyl, or 7-60C aryl alkoxy;    C',D'=6-30C aryl, 2-30C heterocyclyl containing O, N, S, Si and/or P, aryl, fluorenyl, alkenyl, alkynyl, alkoxy, aryloxy, aryl, fluorenyl, arylalkyl, aryl alkenyl, cycloalkenyl, silanyl, siloxanyl, aryl alkoxy, aryl alkenyl, or -L"-N(Rc)(Rd);and    Rc,Rd=1-20C arylthio, 1-20C alkoxy, 1-20C alkyl, 2-20C alkenyl, 2-20C heterocyclyl, 3-20C cycloalkyl, 7-20C aryl, 8-20C aryl alkenyl, 2-20C alkoxy, 6-30C aryloxy, -O-Si(R3)3, or -R3O-Si(R3)-.    (i) When n is 2, X is NH, O, S, SiH2, 1-60C alkylenyl, 6-60C aryl, 2-60C heteroaryl containing O, N, S, Si and/or P, 2-60C alkenyl, or fluorenyl; (ii) When n is 3, X is N, SiH, 1-60C trivalent alkyl, 6-60C trivalent aryl, trivalent 2-60C heteroaryl including O, N, S, Si and/or P, 2-60C trivalent alkenyl, or trivalent fluorenyl; and (iii) When n is 4, X is Si, 1-60C tetravalent alkyl, 6-60C tetravalent aryl, tetravalent 2-60C heteroaryl including O, N, S, Si and/or P, 2-60C tetravalent alkenyl, or tetravalent fluorenyl. INDEPENDENT CLAIMS are included for the following:    (1) composition; and    (2) organic electroluminescent element.