TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The organic layer comprises at least one metal selected from organic metals of Group 1, Group 2, 4th period and 5th period transition metals, lanthanide metals and d-transition elements from the Periodic Table of Elements. The organic layer comprises a charge generating layer as well as the electroluminescent layer.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (Disclosed): Preparation of the compound (I) involves reacting anthraquinone derivative of formula (VI) with alkyl bromide compounds of formulae R1-Br and R2-Br to give to give 9,10-diol-9,10-dihydro-anthracene-9,10-yl derivative of formula (VII); dehydrating the compound (VII) to give corresponding compound (VIII); and then reacting with alkane compound of formulae R3-H and R4-H to give (I). Preferred Compounds: The compound (I) is selected from 8 compounds as given in the specification, e.g. compounds of formulae (Ia) and (Ib). Preferred Components: The organic layer comprises at least one compound selected from arylamine compounds and styrylarylamine compounds. Preferred Definitions:    -Ar1-R5, -Ar2-R6, -Ar3-R7 and -Ar4-R8=44 groups as given in the specification e.g. quinoline, pyrimidine, (1,3,5)triazine, pyrazine, quinoxaline (substituted by R45), anthracene (substituted by R36), 1,2,3,4-tetrahydro-quinoline, 10,11-dihydro-5H-dibenzo(b,f)azepine or chrysene (substituted by R43);    R36, R43 and R45=(1-60C)alkyl, (1-30C)alkoxy, (6-60C)aryl or (5-60C)heteroaryl (all optionally substituted by deuterium, (1-60C)alkyl, (1-30C)alkoxy, halo, cyano, tri(1-30C)alkylsilyl, di(1-30C)alkyl(6-30C)arylsilyl, tri(6-30C)arylsilyl, (5-60C)heteroaryl or (6-60C)aryl), H, deuterium, cyano, halo, tri(1-30C)alkylsilyl, di(1-30C)alkyl(6-30C)arylsilyl or tri(6-30C)arylsilyl;    A'=42 groups as given in the specification e.g. naphthalene, anthracene, 9H-fluorene (di-substituted at 9 position by R52 and R53), 9H,9'H-(2,2')bifluorenyl (di-substituted at 9 position by R52 and R53, and at 9'position by R54 and R55), quinoline, dibenzofuran, dibenzothiophene, 9H-carbazole (substituted at 9 position by R56) or triazine;    R52-R56=deuterium, halo, (1-60C)alkyl, (6-60C)aryl, (4-60C)heteroaryl, 5- or 6-membered heterocycloalkyl (containing heteroatom selected from 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, cyano, (1-60C)alkylamino, (6-60C)arylamino, (6-60C)ar(1-60C)alkyl, (6-60C)aryloxy, (6-60C)arylthio, (1-60C)alkoxycarbonyl, carboxyl, nitro or hydroxyl;or    R52 to R56 optionally linked to an adjacent substituent via (3-60C)alkylene or (3-60C)alkenylene optionally with fused ring=alicyclic ring, or monocyclic or polycyclic aromatic ring.    SPECIFIC COMPOUNDS - 93 Compounds are disclosed as the compound (I), e.g. 9,10-bis-(4-diphenylamino-phenyl)-N,N,N',N'-tetraphenyl-anthracene-2,6-diamine (I'), 9,10-bis-(4-diphenylamino-phenyl)-N,N,N',N'-tetra-naphthalen-2-yl-anthracene-2,6-diamine, 9,10-bis-(4-diphenylamino-phenyl)-N,N,N',N'-tetra-naphthalen-1-yl-anthracene-2,6-diamine, N,N'-di-anthracen-2-yl-9,10-bis-(4-diphenylamino-phenyl)-N,N'-diphenyl-anthracene-2,6-diamine, and 9,10-bis-(4-diphenylamino-phenyl)-N,N'-bis-(4-fluoro-phenyl)-N,N'-di-para-tolyl-anthracene-2,6-diamine. 86 Compounds are disclosed as the anthracene derivatives, e.g. 9,10-bis-(9,9-dimethyl-9H-fluoren-2-yl)-2-phenyl-anthracene (II'), 3,3'-(2-phenylanthracene-9,10-diyl)difluoranthene, 3,3'-(2-phenylanthracene-9,10-diyl)diperylene, 9,10-bis(9,9-dimethyl-9H-fluoren-2-yl)-2-(naphthalen-2-yl)anthracene, and 9,10-di(biphenyl-4-yl)-2-(naphthalen-2-yl)anthracene.    EXAMPLE - A reaction vessel was charged with 4,4'-(2,6-dibromoanthracene-9,10-diyl)bis(N,N-diphenylaniline) (4 g), diphenylamine (3.3 g), sodium-tert-butoxide (1.5 g) and toluene (35 ml). The mixture was stirred under reflux up to 70 degrees C. A palladium acetate (0.1 g) and tert-butylphosphine (in 50% toluene) (0.4 ml) were added to the mixture, and the resultant mixture was stirred under reflux up to 120 degrees C for 12 hours. After work up, 9,10-bis-(4-diphenylamino-phenyl)-N,N,N',N'-tetraphenyl-anthracene-2,6-diamine (2 g) was obtained as dark yellow solid.