NOVELTY - A naphthalene-containing organic electroluminescent compound (I) is new.    USE - Novel naphthalene-containing organic electroluminescent compound is used for organic light-emitting diode, and organic solar cell (both claimed).    ADVANTAGE - The naphthalene-containing organic electroluminescent compound provides organic light-emitting diode having excellent luminous efficiency, color purity and durability.    DETAILED DESCRIPTION - A naphthalene-containing organic electroluminescent compound of formula (I) is new.    L1=6-60C arylene or 3-60C heteroarylene containing heteroatom(s) chosen from N, O and S, or bivalent group of formula (a-c);    L2,L3=chemical bond, 1-60C alkyleneoxy, 1-60C alkylenethio, 6-60C aryleneoxy, 6-60C arylenethio, 6-60C arylene or 3-60C heteroarylene containing heteroatom(s);    Ar1=NR41R42, 6-60C aryl, 3-60C heteroaryl containing heteroatom(s), 5-or 6-membered heterocycloalkyl containing heteroatom(s), 3-60C cycloalkyl, adamantyl, 7-60C bicycloalkyl, or substituent of formula (d-g);    R1-R11,R21-R31,R41,R42,R51-R62,R71-R85=H, deuterium, halo, 1-60C alkyl, 6-60C aryl, 3-60C heteroaryl containing heteroatom(s), morpholino, thiomorpholino, 5- or 6-membered heterocycloalkyl containing heteroatom(s), 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, (6-60C)ar(1-60C)alkyl, 1-60C alkyloxy, 1-60C alkylthio, 6-60C aryloxy, 6-60C arylthio, 1-60C alkoxycarbonyl, 1-60C alkylcarbonyl, 6-60C arylcarbonyl, carboxy, nitro or hydroxy, or R1-R11, R21-R31, R41,R42, R51-R62, R71 and R72, R74 and R75, R79 and R80, R81 and R82, or R84 and R85 optionally linked to an adjacent substituent through 3-60C alkylene or 3-60C alkenylene optionally having fused ring to form an alicyclic ring, or a monocyclic or polycyclic aromatic ring;    X,Y'=chemical bond, -(CR71R72)m-, -N(R73)-, -S-, -O-, -Si(R74)(R75)-, -P(R76), -C(=O)-, -B(R77)-, -In(R78)-, -Se-, -Ge(R79)(R80)-, -Sn(R81)(R82)-, -Ga(R83)- or -(R84)C=C(R85)-;and    m,x=1-4.    An INDEPENDENT CLAIM is included for an organic light-emitting diode, which comprises electrode (i), electrode (ii) and at least one organic layer(s) interposed between the electrode (i) and the electrode (ii). The organic layer comprises naphthalene-containing organic electroluminescent compound(s) (I), and dopant(s) chosen from perylene derivative of formula (II), benzothiazole-containing compound of formula (III), and amine compound of formula: Ar13-(N(-Ar11)(-Ar12))a.    R301-R304=H, deuterium, halo, 1-60C alkyl, 6-60C aryl, 4-60C heteroaryl containing heteroatom(s), 5- or 6-membered heterocycloalkyl containing heteroatom(s), 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, (6-60C)ar(1-60C)alkyl, 6-60C aryloxy, 1-60C alkyloxy, 1-60C alkylthio, 6-60C arylthio, 1-60C alkoxycarbonyl, 1-60C alkylcarbonyl, 6-60C arylcarbonyl, carboxy, nitro or hydroxy, or R301-R304 optionally linked to adjacent substituent through 3-60C alkylene or 3-60C alkenylene optionally having fused ring to form alicyclic ring, or monocyclic or polycyclic aromatic ring, where alkyl, alkenyl, alkynyl, cycloalkyl, heterocycloalkyl, aryl, heteroaryl, arylsilyl, alkylsilyl, alkyloxy, aryloxy, arylthio, alkylamino, and arylamino of R301-R304, or alicyclic ring, or monocyclic or polycyclic aromatic ring may further substituted by substituent(s) chosen from deuterium, halo, 1-60C alkyl, 6-60C aryl, 4-60C heteroaryl containing heteroatom(s), 5- or 6-membered heterocycloalkyl containing heteroatom(s), 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, (6-60C)ar(1-60C)alkyl, 6-60C aryloxy, 1-60C alkyloxy, 1-60C alkylthio, 6-60C arylthio, 1-60C alkoxycarbonyl, 1-60C alkylcarbonyl, 6-60C arylcarbonyl, carboxy, nitro and hydroxy;    Ar11,Ar12=1-60C alkyl, 6-60C aryl, 4-60C heteroaryl containing heteroatom(s), 6-60C arylamino, 1-60C alkylamino, 5- or 6-membered heterocycloalkyl containing heteroatom(s), or 3-60C cycloalkyl, or Ar11 and Ar12 optionally linked through 3-60C alkylene or 3-60C alkenylene optionally having fused ring to form alicyclic ring or monocyclic or polycyclic aromatic ring;    a=1 or 2, when a is 1, Ar13 is 6-60C aryl, 4-60C heteroaryl, or substituent of formula: R311-CC-Ar22- (k), or of formula (l or m), and when a is 2, Ar13 is 6-60C arylene, 4-60C heteroarylene containing heteroatom(s), or substituent of formula (k-m);    Ar21,Ar22=6-60C arylene or 4-60C heteroarylene containing heteroatom(s);    R311-R315=H, deuterium, 1-60C alkyl or 6-60C aryl;    b=1-4;and    c,d=0 or 1.    Where alkyl, aryl, heteroaryl, arylamino, alkylamino, cycloalkyl or heterocycloalkyl of Ar11 and Ar12, aryl, heteroaryl, arylene or heteroarylene of Ar13, arylene or heteroarylene of Ar21 and Ar22, or alkyl or aryl of R311-R315 may further substituted by substituent(s) chosen from deuterium, halo, 1-60C alkyl, 6-60C aryl, 4-60C heteroaryl containing heteroatom(s), 5- or 6-membered heterocycloalkyl containing heteroatom(s), 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, (6-60C)ar(1-60C)alkyl, 6-60C aryloxy, 1-60C alkyloxy, 1-60C arylthio, 6-60C alkylthio, 1-60C alkoxycarbonyl, 1-60C alkylcarbonyl, 6-60C arylcarbonyl, carboxy, nitro and hydroxy.