NOVELTY - An organic electroluminescent device comprises an organic layer interposed between an anode and an cathode on a substrate, where the organic layer comprises an electroluminescent layer containing at least one anthracene derivative (I) as host compound and at least one diamine derivative (II) as dopant compound.    USE - As organic electroluminescent device such as organic solar cell (claimed).    ADVANTAGE - The organic electroluminescent device exhibits long life, high efficiency and high luminance with high color purity, lowered operation voltage, and enhanced stability of device.    DETAILED DESCRIPTION - An organic electroluminescent device comprises an organic layer interposed between an anode and an cathode on a substrate, where the organic layer comprises an electroluminescent layer containing at least one anthracene derivative of formula (I) as host compound and at least one diamine derivative of formula R41-N(R42)-L-N(R43)-R44 (II) as dopant compound.    Ar1, Ar2, R1 and R2=H, G1, or substituent selected from group of formula (ia)-(ic), (where each of Ar1, Ar2, R1 and R2 is optionally linked to an adjacent substituent via 3-60C alkylene or 3-60C alkenylene with or without a fused ring to form an alicyclic ring, or monocyclic or polycyclic aromatic ring);    G1=deuterium, halo, 1-60C alkyl, 6-60C aryl, 4-60C heteroaryl, 3-60C cycloalkyl, tri(1-60C)alkylsilyl, di(1-60C)alkyl(6-60)arylsilyl, tri(6-60C)arylsilyl, adamantyl, 7-60C bicycloalkyl, 2-60C alkenyl, 2-60C alkynyl, 1-60C alkoxy, cyano, 1-60C alkylamino, 6-60C arylamino, (6-60C)ar(1-60C)alkyl, 6-60C aryloxy, 6-60C arylthio, 1-60C alkoxycarbonyl, carboxyl, nitro, hydroxyl, or 5- or 6-membered heterocycloalkyl containing at least one heteroatom selected from N, O and S;    R3-R15=H or G1;    X and Y'=chemical bond, -C(R21)(R22)-, -N(R23)-, -S-, -O-, -Si(R24)(R25)-, -P(R26)-, -C(=O)-, -B(R27)-, -In(R28)-, -Se-, -Ge(R29)(R30)-, -Sn(R31)(R32)-, -Ga(R33)-, or -(R34)C=C(R35)-;    R21-R35=H or G1 (where each of R21-R35 is optionally linked to an adjacent substituent via 3-60C alkylene or 3-60C alkenylene with or without a fused ring to form an alicyclic ring, or monocyclic or polycyclic aromatic ring);    a, b and n=0-4;or    a+b= greater than or equal to 1;    L=6-60C arylene (optionally substituted by G1, and the alkyl, (hetero)cycloalkyl, (hetero)aryl, arylsilyl, alkylsilyl, alkylamino and arylamino substituent on the arylene optionally further substituted by at least one G1);    R41-R44=1-60C alkyl, 6-60C aryl, 4-60C heteroaryl, 6-60C arylamino, 1-6C alkylamino, 3-60C cycloalkyl, or 5- or 6-membered heterocycloalkyl containing at least one heteroatom selected from N, O and S, (where each of R41-R44 is linked to an adjacent substituent via 3-60C alkylene or 3-60C alkenylene with or without a fused ring to form an alicyclic ring, or monocyclic or polycyclic aromatic ring, and the alkyl, (hetero)aryl, arylamino, alkylamino or (hetero)cycloalkyl of R41-R44 optionally further substituted by at least one G1).    The alkyl, alkenyl, alkynyl, (hetero)cycloalkyl, (hetero)aryl, arylsilyl, alkylsilyl, alkylamino and arylamino of Ar1, Ar2, R1 and R2 optionally further substituted by at least one G1.