NOVELTY - Organic electroluminescent substituted tricyclic compounds (I) are new.    USE - (I) is useful in white electroluminescent device, an organic solar cell (claimed) and organic light emitting diode.    ADVANTAGE - (I) has good luminous efficiency in blue color, excellent color purity, and life property of material and provides organic light emitting diode having very good operation life.    DETAILED DESCRIPTION - Organic electroluminescent substituted tricyclic compounds of formula (I) are new.    A = 6-60C arylene or 2-60C heteroarylene (both optionally substituted by T1) or bond,;    Ar1 = 6-40C arylene or 2-40C heteroarylene (both optionally substituted by T1) or 9-phenyl-9,10-dihydro-anthracen-diyl moiety of formula (II);    Ar2 = 1-20C alkyl, 6-20C aryl, 2-20C heteroaryl, 2-20C alkenyl, 2-20C alkynyl or 3-20 cycloalkyl (all optionally substituted by T1), H or (II); either    R1, R2 = 1-60C alkyl, 6-60C aryl, 2-60C heteroaryl, (thio)morpholino, piperidino, 5-6 membered heterocycloalkyl (containing at least one of N, O or S), 3-60C cycloalkyl or adamantyl (all optionally substituted by T1); or    R1R2+optionally with a fused ring linked via 3-60C alkylene or 3-60C alkenylene = to form a fused ring, and the C of the alkylene is optionally substituted by O, S or NR3;    R3 = H, 1-60C alkyl, 1-60C (halo)alkyl, 1-60C alkoxy, (thio)morpholino, piperidino, 5-6 membered heterocycloalkyl containing at least one N, O or S, 3-60C cycloalkyl, adamantyl, halo, CN, 6-60C aryl, 2-60C heteroaryl, 1-60C trialkylsilyl, di(1-60C)alkyl(6-60C)arylsilyl or tri(6-60C) arylsilyl (all optionally substituted by T1);    X1, Y1 = bond, -(CR4R5)n-, -N(R6)-, -Si(R7)(R8)-O-, -S-, -Se- or -(R9)C=C(R10)-; either    R4-R10 = H, 1-60C alkyl, 1-60C (halo)alkyl, 1-60 alkoxy, (thio)morpholino, piperidino, 5-6 membered heterocycloalkyl containing at least one N, O or S, 3-60C cycloalkyl, adamantyl, halo, CN, 6-60C aryl, 2-60C heteroaryl, tri(1-60C)alkylsilyl, di(1-60C)alkyl(6-60C)arylsilyl or tri(6-60C)arylsilyl (all optionally substituted by T1); or    R4+R5, R7+R8, R9+R10 optionally with fused ring linked via 3-12C alkylene or 3-12C alkenylene = form a fused ring;    T1 = 1-60C alkyl, 1-60C (halo)alkyl, 1-60C alkoxy, piperidino, (thio)morpholino, 5-6 membered heterocycloalkyl containing at least one N, O or S, 3-60C cycloalkyl, halo, CN, 6-60C aryl, 2-60C heteroaryl, 6-60C ar(1-60C)alkyl, 1-60C alkyl(6-60C)aryl, tri(1-60C)alkylsilyl, di(1-60C)alkyl(6-60C)arylsilyl, tri(6-60C)arylsilyl, 3-methyl-2-((Z)-propenyl)-1H-indolyl, anthracene moiety of formula (III), 10H-phenoxazinyl, 10H-phenothiazinyl, 5,10-dihydro-phenazine moiety of formula (IV), 5,10-dihydro-phenazasiline moiety of formula (V), dibenzo(b,f)azepine moiety of formula (VI) or dibenzo(b,f)azepine moiety of formula (VII);    m = 1-3; and    n = 1-4.    Provided that: total number of C-atoms in (-Ar1-Ar2) is 19-60. An INDEPENDENT CLAIM is also included for an organic electroluminescent device comprising 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 organic electroluminescent substituted tricyclic compounds (I) and at least one host comprising aryl compounds of formula ((Ar11)a-L1-(Ar12)b) (II) or ((Ar13)c-L2-(Ar)14)d) (III).    L-1 = 6-60C arylene or 4-60C heteroarylene;    L2 = anthracenylene;    Ar11-Ar14 = H, 1-60C alkyl, 1-60C alkoxy, halo, 4-60 heteroaryl, 5-60C cycloalkyl or 6-60C aryl (all optionally substituted by at least one of 6-60C aryl or 4-60C heteroaryl, at least one of 1-60C alkyl (optionally substituted by halo, 1-60C alkoxy, 3-60C cycloalkyl, CN, tri(1-60C alkylsilyl, di(1-60C)alkyl(6-60C)arylsilyl or tri(6-60C)arylsilyl), 1-60C (halo)alkyl, 1-60C alkoxy, 3-60C cycloalkyl, halo, CN, tri(1-60C)alkylsilyl, di(1-60C)alkyl(6-60)arylsilyl or tri(6-60C)arylsilyl); and    a, b, c, d = 0-4.    DESCRIPTION OF DRAWING(S) - The figure shows a cross-sectional view of an organic light emitting diode.    Glass (1)    Transparent electrode (2)    Hole injecting layer (3)    Hole transport layer (4)    Electroluminescent layer (5)