NOVELTY - Substituted tricyclic heteroaryl organic electroluminescent compounds (I) are new.    USE - (I) are useful in the organic electroluminescent device, a white electroluminescent device and an organic solar cell (all claimed). (I) are useful as blue or green electroluminescent material.    ADVANTAGE - (I) have high efficiency, excellent color purity and excellent life property of material. (I) provides organic LEDs having very good operation life. (I) provides the organic electroluminescent device having excellent luminous efficiency and surprisingly improved lifetime. (I) provides longer device life and appropriate color coordinate.    DETAILED DESCRIPTION - Substituted tricyclic heteroaryl organic electroluminescent compounds of formula (I) are new.    A, B1 = CR7 or N;    X = O or S;    R1, R2, R7 = H, or T; either    R3-R6 = H, or T; or    R3+R4 or R5+R6 and linked via (3-60C)alkylene or (3-60C)alkenylene = fused ring (where the alkylene or alkenylene is optionally substituted by one or more substituents of T);    Ar1, Ar2 = (6-60C)aryl, (3-60C)heteroaryl, 5- or 6-membered heterocycloalkyl containing one or more heteroatoms of N, O or S, (3-60C)cycloalkyl, adamantyl, (7-60C)bicycloalkyl, or substituent comprising heterocyclic groups of formula (a1) or (a2), or cyclic groups of formula (a3); either    R11-R23 = H, or T; or    R11-R23 and linked to an adjacent substituent via (3-60C)alkylene or (3-60C)alkenylene with or without fused ring = alicyclic ring, or monocyclic or polycyclic aromatic ring;    D1, E1 = chemical bond, -(CR31R32)a-, -N(R33)-, -S-, -O-, -Si(R34)(R35)-, -P(R36)-, -C(=O)-, -B(R37)-, -In(R38)-, -Se-, -Ge(R39)(R40)-, -Sn(R41)(R42)-, - Ga(R43)- or -(R44)C=C(R45)-;    R33, R36-R38, R43 = H or T; either    R31-R45 = H or T; or    R31+R32, R34+R35, R39+R40, R41+R42 or R44+R45 and linked via (3-60C)alkylene or (3-60C)alkenylene with or without fused ring = alicyclic ring, or monocyclic or polycyclic aromatic ring (where the alkyl, aryl, heteroaryl, heterocycloalkyl, cycloalkyl, trialkylsilyl, dialkylarylsilyl, triarylsilyl, adamantyl, bicycloalkyl, alkenyl, alkynyl, alkylamino or arylamino of R1-R7, Ar1, Ar2, R11-R23 or R31-R45 is optionally substituted by T);    T = D, halo, (1-60C)alkyl, (6-60C)aryl, (3-60C)heteroaryl, 5- or 6-membered heterocycloalkyl containing one or more heteroatoms of N, O or 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, (1-60C)alkoxy, CN, (1-60C)alkylamino, (6-60C)arylamino, (6-60C)ar(1-60C)alkyl, (6-60C)aryloxy, (6-60C)arylthio, (1-60C)alkoxycarbonyl, carboxyl, NO2 or OH; and    a = 1-4.    Provided that both A and B1 cannot be CR7 or N at the same time. An INDEPENDENT CLAIM is included for an organic electroluminescent device which is comprised of a first electrode, a second electrode, and at least one organic layer interposed between the first electrode and the second electrode, where the organic layer comprises (I) and one or more dopants of a perylene compound of formula (a4), 9-benzothiazol-2-yl-1,1,6,6-tetramethyl-2,3,5,6-tetrahydro-1H,4H-11-oxa-3a-aza-benzo(de)anthracen-10-one, or an amine compound of formula (Ar13-(N(Ar11)(Ar12))c).    Either R101-R104 = H, or T1; or    R101-R104 and linked via (3-60C)alkylene or (3-60C)alkenylene with or without fused ring = alicyclic ring, or monocyclic or polycyclic aromatic ring (where the alkyl, alkenyl, alkynyl, cycloalkyl, heterocycloalkyl, aryl, heteroaryl, arylsilyl, alkylsilyl, alkoxy, aryloxy, arylthio, alkylamino, or arylamino of R101-R104, or the alicyclic ring, or the monocyclic or polycyclic aromatic ring is optionally substituted by one or more substituents of T1); either    Ar11, Ar12 = (1-60C)alkyl, (6-60C)aryl, (4-60C)heteroaryl, (1-60C)alkylamino, (6-60C)arylamino, 5- or 6-membered heterocycloalkyl containing one or more heteroatoms of N, O or S, or (3-60C)cycloalkyl (all optionally substituted by T1); or    Ar11+Ar12 and linked via (3-60C)alkylene or (3-60C)alkenylene with or without fused ring = alicyclic ring, or monocyclic or polycyclic aromatic ring; either    Ar13 = (6-60C)arylamino, (6-60C)aryl, or (4-60C)heteroaryl (all optionally substituted by T1) or substituent comprising a styrene group of formula (a5), (R111-C?=C-Ar15-) or a 9H-fluorene group of formula (a6) (where c is 1); or    Ar13 = (6-60C)arylene, or (4-60C)heteroarylene (both optionally substituted by T1) or substituent comprising a styrene group of formula (a7), (-C?=C-Ar15-), or a 9H-fluorene group of formula (a8) (where c is 2);    Ar14, AR15 = (6-60C)arylene, or (4-60C)heteroarylene (both optionally substituted by T1);    R111-R113 = (1-60C)alkyl or (6-60C)aryl (both optionally substituted by T1), H or D;    T1 = D, halo, (1-60C)alkyl, (6-60C)aryl, (4-60C)heteroaryl, 5- or 6-membered heterocycloalkyl containing one or more heteroatoms of N, O or 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, (1-60C)alkoxy, CN, (1-60C)alkylamino, (6-60C)arylamino, (6-60C)ar(1-60C)alkyl, (6-60C)aryloxy, (1-60C)alkylthio, (6-60C)arylthio, (1-60C)alkoxycarbonyl, (1-60C)alkylcarbonyl, (6-60C)arylcarbonyl, carboxyl, NO2 or OH;    d = 1-4; and    e = 0-1.