TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (disclosed): A bromine-containing compound of formula: Br-A-Ar'-B'-Br (I) is reacted with n-butyllithium, silicon compound of formula: R2-Si(-R1)(-R3)-Cl and chlorine compound of formula: Cl-X to obtain silicon-containing organic electroluminescent compound of formula (1).Claimed Device: The organic layer comprises organic electroluminescent compound(s) of formula: R2-Si(-R1)(-R3)-A-Ar'-B'-X (1), and dopant(s) chosen from perylene derivative of formula (2), amine compound of formula: Ar13-N(-Ar14)-Ar11-CH=CH-Ar12-N(-Ar15)(-Ar16) (3), amine compound of formula (4), benzothiazole-containing compound of formula (5), amine compound of formula: R71-N(-R72)-L-N(-R73)-R74 (6) and metal-containing compound of formula: M1L1L2L3 (7).R301-R304 = H, deuterium, halo, 1-60C alkyl, 6-60C aryl, 4-60C heteroaryl, 5- or 6-membered heterocycloalkyl containing heteroatom(s) chosen from nitrogen, oxygen and sulfur, 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 hydroxyl, or each of R301-R304 is 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, and the alkyl, alkenyl, alkynyl, cycloalkyl, heterocycloalkyl, aryl, heteroaryl, arylsilyl, alkylsilyl, alkyloxy, aryloxy, arylthio, alkylamino or arylamino of R301-R304, or the alicyclic ring, or the monocyclic or polycyclic aromatic ring is further substituted by deuterium, halo, 1-60C alkyl, 6-60C aryl, 4-60C heteroaryl, 5- or 6-membered heterocycloalkyl containing heteroatom(s) chosen from nitrogen, oxygen and sulfur, 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, carboxyl, nitro and hydroxy;Ar11, Ar12 = 6-60C arylene, 5-60C heteroarylene (both optionally substituted), or indenofluorene of formula (g), fluorene of formula (h) or spiro-fluorene of formula (i);Ar13-Ar16 = 6-60C aromatic ring, 5-60C heteroaromatic ring and polycyclic aromatic ring;Ar17-Ar20 = 5-60C aromatic ring, 5-60C heteroaromatic ring, or fused polycyclic aromatic ring having 2 or more fused aromatic rings;Q = group of formula (j or k);G, H'= chemical bond, group of formula: -C(-R61)=C(-R62)- or group of formula (l);R41 ,R42 = 5-60C aromatic ring, 5-60C heteroaromatic ring, or fused polycyclic aromatic ring having 2 or more fused aromatic ring;R43-R46 = linear or branched 1-60C alkyl optionally having halo, optionally substituted 6-50C aryl, optionally substituted 5-50C heteroaryl, or halo;R51-R56 = 1-60C alkyl, optionally substituted 6-50C aryl, optionally substituted 5-50C heteroaryl, halo, and phenyl or naphthyl optionally having 1-60C alkyl substituent;R61-R64 = H, deuterium, halo or 5-60C aromatic ring;L = 6-60C arylene optionally having hydrogen, deuterium, halo, 1-60C alkyl, 6-60C aryl, 4-60C heteroaryl, 5- or 6-membered heterocycloalkyl containing heteroatom(s) chosen from nitrogen, oxygen and sulfur, 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, cyano, 1-60C alkylamino, 6-60C arylamino, 6-60C ar(1-60C)alkyl, 6-60C aryloxy, 6-60C arylthio, 1-60C alkoxycarbonyl, carboxy, nitro and/or hydroxy, and alkyl, cycloalkyl, heterocycloalkyl, aryl, heteroaryl, arylsilyl, aryloxy, alkyloxy, arylthio, alkylthio, alkylsilyl, alkylamino and arylamino substituent on the arylene is further substituted by deuterium, halo, 1-60C alkyl, 6-60C aryl, 4-60C heteroaryl, 5- or 6-membered heterocycloalkyl containing heteroatom(s) chosen from nitrogen, oxygen and sulfur, 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, cyano, 1-60C alkylamino, 6-60C arylamino, 6-60C ar(1-60C)alkyl, 6-60C aryloxy, 6-60C arylthio, 1-60C alkoxycarbonyl, carboxy, nitro and/or hydroxy;R71-R74 = H, halo, deuterium, 1-60C alkyl, 6-60C aryl, 4-60C heteroaryl, 6-60C arylamino, 1-60C alkylamino, 5- or 6-membered heterocycloalkyl containing heteroatom(s) chosen from nitrogen, oxygen and sulfur, adamantyl, 3-60C cycloalkyl, or each of R71-R74 is optionally linked to 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, and alkyl, aryl, heteroaryl, arylamino, alkylamino, cycloalkyl and heterocycloalkyl of R71-R74 is further substituted by substituent(s) chosen from deuterium, halo, 1-60C alkyl, 6-60C aryl, 4-60C heteroaryl, 5- or 6-membered heterocycloalkyl containing heteroatom(s) selected from N, O and 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, cyano, 1-60C alkylamino, 6-60C arylamino, 6-60C ar(1-60C) alkyl, 6-60C aryloxy, 6-60C arylthio, 1-60C alkoxycarbonyl, carboxy, nitro and hydroxy;M1 = metals chosen from group 7, 8, 9, 10, 11, 13, 14, 15 and 16 of periodic table of elements;L1-L3 = group chosen from 26 cyclic groups, e.g. group of formulae (m-q);R81-R83 = hydrogen, deuterium, 1-60C alkyl optionally having halo substituent(s), 6-60C aryl optionally having 1-60C alkyl substituent, or halo;andR84-R87 = H, deuterium, 1-60C alkyl, 1-30C alkoxy, 3-60C cycloalkyl, 2-30C alkenyl, 6-60C aryl, mono or di-1-30C alkylamino, mono or di-6-30C arylamino, SF5, tri-1-30C alkylsilyl, di-1-30C alkyl 6-30C arylsilyl, tri 6-30C arylsilyl, cyano or halo, and the alkyl, cycloalkyl, alkenyl or aryl of R84-R99 is further substituted by deuterium, 1-60C alkyl, 6-60C aryl and halo.Preferred Components: The organic layer comprises compound(s) chosen from arylamine compound and styrylarylamine compound. The organic layer comprises metal(s) chosen from organic metals of group 1, group 2, 4 and 5 period transition metals, lanthanide metals and d-transition elements. The organic layer comprises electroluminescent layer and charge generating layer. The mixed portion of reductive dopant and organic substance, or mixed region of oxidative dopant and organic substance is placed on the inner surface of electrode(s). Preferred Definitions:    Ar'= group chosen from 51 arylene or heteroarylene group, e.g. group of formulae (b-f);    D', E = CR31R32, NR33, oxygen or sulfur;    R21, R22, R24, R25 = linear or branched and (un)saturated 1-60C alkyl, 1-30C alkoxy, halo or 6-60C aryl;    R31-R33 = linear or branched and (un)saturated 1-60C alkyl or 6-60C aryl, where alkyl, alkoxy or aryl of R21-R25, R31-R33 is further substituted by halo, or linear or branched 1-60C alkyl;    m = 0-4;and    n = 0-3.    SPECIFIC COMPOUNDS - 68 Silicon-containing organic electroluminescent compounds are disclosed. E.g. (9,9-diphenyl-7-(triphenylsilyl)-9H-fluoren-2-yl)triphenylsilane of formula (A), triphenyl(7-(triphenylsilyl)-1',3'-dihydrospiro(fluorene-9,2'-indene)-2-yl)silane, (9,9-dimethyl-7-(naphthalen-1-yldiphenylsilyl)-9H-fluoren-2-yl)(naphthalen-1-yl)diphenylsilane, cyclohexa-1,3-dien-1-yl((7-(9,9-dimethyl-7-(triphenylsilyl)-9H-fluoren-2-yl)-9,9-dimethyl-9H-fluoren-2-yl))diphenylsilane and (9,9-dimethyl-7-(4-(triphenylsilyl)phenyl)-9H-fluoren-2-yl)triphenylsilane.    EXAMPLE - 2,7-Dibromo-(9,9'-dimethyl)fluorene (in g) (10), tetrahydrofuran (200 ml), n-butyllithium (1.6 M in tetrahydrofuran) (28.4 ml) were stirred for 1 hour, and triphenylsilyl chloride (20.9) was added to the reaction mixture and stirred for 12 hours. Then, distilled water was added to the reaction mixture, which was then extracted with organic solvent and purified to obtain (9,9-dimethyl-7-(triphenylsilyl)-9H-fluoren-2-yl)triphenylsilane.