NOVELTY - A fluorene-containing organic electroluminescent compound (1) is new.    USE - Fluorene-containing organic electroluminescent compound is used for organic electroluminescent device and solar cell (both claimed).    ADVANTAGE - The fluorene-containing organic electroluminescent compound provides organic electroluminescent device having high luminous efficiency, color purity and durability.    DETAILED DESCRIPTION - A fluorene-containing organic electroluminescent compound of formula (1) is new.    Ar=6-60C arylene, 3-60C heteroarylene, 5- or 6-membered heterocycloalkylene containing heteroatom(s) chosen from nitrogen, oxygen and sulfur, 3-60C cycloalkylene, adamantylene, 7-60C bicycloalkylene, 2-60C alkenylene, 2-60C alkynylene, 1-60C alkylenethio, 1-60C alkyleneoxy, 6-60C aryleneoxy, 6-60C arylenethio or group of formula (a);    A,B'=single bond, -(CR11)(R12)m-, -N(R13)-, -S-, -O-, -Si(R14)(R15)-, -P(R16)-, -C(=O)-, -B(R17)-, -In(R18)-, -Se-, -Ge(R19)(R20)-, -Sn(R21)(R22)-, -Ga(R23)- or -(R24)C=C(R25)-;    R1-R8,R11-R25=H, deuterium, halo, 1-60C alkyl, 6-60C aryl, 3-60C heteroaryl, morpholino, thiomorpholino, 5- or 6-membered heterocycloalkyl containing heteroatom(s) chosen from nitrogen, oxygen and sulfur, 3-60C cycloalkyl, tri(1-60C)alkylsilyl, di(1-60C)alkyl(6-60C)arylsilyl, tri(6-60C)arylsilyl, adamantyl, 7-60C bicycloalkyl, 2-60C alkenyl, 2-60C alkynyl, cyano, 1-60C alkylamino, 6-60C arylamino, 1-60C alkyloxy, 1-60C alkylthio, 6-60C aryloxy, 6-60C arylthio, 1-60C alkoxycarbonyl, 1-60C alkylcarbonyl, 6-60C arylcarbonyl, carboxyl, nitro or hydroxyl;and    m=1-3.    Full Definitions are included in "DEFINITIONS - Full Definitions" field. An INDEPENDENT CLAIM is included for organic electroluminescent device. The device has an organic layer containing the organic electroluminescent compound and host(s), interposed between a primary electrode and a secondary electrode. The host is of formula: (Ar11)a-X-(Ar12)b or (Ar13)c-Y-(Ar14)d.    X=6-60C arylene or 4-60C heteroarylene;    Y'=anthracenylene;    Ar11-Ar14=H, deuterium, 1-60C alkyl, 1-60C alkoxy, halo, 4-60C heteroaryl containing heteroatom(s) chosen from nitrogen, oxygen and sulfur, 5-60C cycloalkyl or 6-60C aryl, in which cycloalkyl, aryl and heteroaryl are further substituted by substituent(s) chosen from 6-60C aryl, 1-60C alkyl, 1-60C alkoxy, 3-60C cycloalkyl, deuterium, halo, cyano, tri(1-60C)alkylsilyl, di(1-60C)alkyl(6-60C)arylsilyl and tri(6-60C)arylsilyl, 4-60C heteroaryl containing heteroatom(s) chosen from nitrogen, oxygen and sulfur, 1-60C alkyl with or without halo substituent(s), 1-60C alkoxy, 3-60C cycloalkyl, deuterium, halo, cyano, tri(1-60C)alkylsilyl, di(1-60C)alkyl(6-60C)arylsilyl and tri(6-60C)arylsilyl;and    a-d=0-4.