NOVELTY - Substituted 9H-fluorene compounds (I) are new, where (I) is an electroluminescent compound.    USE - (I) are useful in an organic electroluminescent device, preferably white light-emitting electroluminescent device (all claimed). (I) are useful: as a blue light-emitting electroluminescent material; in organic solar cell; and organic light emitting diode.    ADVANTAGE - (I): provides an electroluminescent device having superior luminous efficiency and superior operation life; and has excellent color purity.    DETAILED DESCRIPTION - Substituted 9H-fluorene compounds of formula (I) are new, where (I) is an electroluminescent compound.    either R1, R2 = T; or    R1 and R2 linked via (3-60C) alkylene or (3-60C)alkenylene with or without a fused ring = form X;    X = an alicyclic ring, or a mono- or polycyclic aromatic ring;    T = H, deuterium, halo, (1-60C)alkyl, (6-60C)aryl, (3-60C)heteroaryl containing heteroatom(s) comprising N, O or S, (thio)morpholino, 5- or 6-membered heterocycloalkyl containing heteroatom(s) comprising 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, CN, (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, carboxyl, nitro or OH;    Ar1 = (6-60C)arylene, (3-60C)heteroarylene containing heteroatom(s) comprising N, O or S, 5- or 6-membered heterocycloalkylene containing heteroatom(s) comprising N, O or S, (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 phenyl group of formula (a);    ring A, ring B1 = 5-7 membered heterocyclic amino group or a ring comprising quinoline group of formula (b) or (c), or heterocyclic group of formula (d) or (e), where the 5-7 membered heterocyclic amino group may further contain heteroatom(s) comprising NR21, O or S; either    R11-R18 = H, deuterium, halo, (1-60C)alkyl, (6-60C)aryl, (3-60C)heteroaryl containing heteroatom(s) comprising N, O or S, 5- or 6-membered heterocycloalkyl containing heteroatom(s) comprising 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, CN, (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)alkylcarbonyl, (1-60C)alkoxycarbonyl, (6- 60C)arylcarbonyl, carboxyl, nitro or OH; or    R11-R18 linked to an adjacent substituent via (3-60C)alkylene or (3-60C)alkenylene with or without a fused ring = form X;    R21 = H, deuterium, (1-60C)alkyl, (6-60C)aryl, (3-60C)heteroaryl containing heteroatom(s) comprising N, O or S, (3-60C)cycloalkyl, adamantyl, (7-60C)bicycloalkyl or (6-60C)ar(1-60C)alkyl;    X, Y1 = chemical bond, -(CR31R32)m-, -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)-; either    R31-R45 = T; or    R31R32, R34R35, R39R40, R41R42, R44R45 linked via (3-60C)alkylene or (3-60C)alkenylene with or without a fused ring = form X, where the (hetero)arylene, (hetero)cycloalkylene, adamantylene, bicycloalkylene, alkenylene, alkylenethio, alkyleneoxy, aryleneoxy or arylenethio of Ar1 and (hetero)aryl, heterocycloalkyl, (cyclo)alkyl, trialkylsilyl, dialkylarylsilyl, triarylsilyl, adamantyl, bicycloalkyl, alkenyl, alkylamino, arylamino, aralkyl, alkyloxy, alkylthio, aryloxy, arylthio, alkoxycarbonyl, alkylcarbonyl or arylcarbonyl of R1, R2, R11-R18, R21 and R31-R45 may be further substituted by halo, (1-60C)alkyl with or without halo, (6-60C)aryl, (3-60C)heteroaryl containing heteroatom(s) comprising N, O or S with or without (6-60C)aryl, (thio)morpholino, 5- or 6-membered heterocycloalkyl containing heteroatom(s) comprising 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, CN, carbazolyl, (1-60C)alkylamino, (6-60C)arylamino, (6-60C)ar(1-60C)alkyl, (1-60C)alkyl(6-60C)aryl, (1-60C)alkyloxy, (1-60C)alkylthio, (6-60C)aryloxy, (6-60C)arylthio, (1-60C)alkoxycarbonyl, (1-60C)alkylcarbonyl, (6-60C)arylcarbonyl, carboxyl, nitro or OH; and    m = 1-4.    An INDEPENDENT CLAIM is also included for an organic electroluminescent device comprising a first electrode, a second electrode and organic layer(s) interposed between the first electrode and the second electrode, where the organic layer comprises (I) and host(s) comprising aryl compounds of formula ((Ar11)a-L1-(Ar12)b) or ((Ar13)c-L2-(Ar14)d).    L1 = (6-60C)arylene or (4-60C)heteroarylene containing heteroatom(s) comprising N, O or S;    L2 = anthracenylene;    Ar11-Ar14 = H, deuterium, (1-60C)alkyl, (1-60C)alkoxy, halo, (4-60C)heteroaryl containing heteroatom(s) comprising N, O or S, (5-60C)cycloalkyl or (6-60C)aryl, where (hetero)arylene or anthracenylene of L1 and L2, and the cycloalkyl, or (hetero)aryl of Ar11-Ar14 may be further substituted by (6-60C)aryl with or without (1-60C)alkyl with or without halo, (1-60C)alkoxy, (3-60C)cycloalkyl, halo, CN, tri(1-60C)alkylsilyl, di(1-60C)alkyl(6-60C)arylsilyl, tri(6-60C)arylsilyl, (4-60C)heteroaryl containing heteroatom(s) comprising N, O or S, (1-60C)alkyl with or without halo, (1-60C)alkoxy, (3-60C)cycloalkyl, halo, CN, tri(1-60C)alkylsilyl, di(1-60C)alkyl(6-60C)arylsilyl or tri(6-60C)arylsilyl; and    a, b, c, d = 0-4.