TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (disclosed): 6,12-dibromo chrysene is carbazolyzed by carbazole, to obtain carbazole derivative (1). Preferred Components: The silyl groups in the substituents of the compound (1) are trimethyl silyl, triethyl silyl, ethyldimethylsilyl, t-butyldimethylsilyl, vinyl dimethylsilyl, propyl dimethylsilyl, triisopropylsilyl or triphenyl silyl. The organic electroluminescent element comprises organic thin film layer having single layer or multiple layers containing light emitting layer provided between anode and cathode. Preferred Composition: The organic thin film layer comprises carbazole derivative. The light emitting layer comprises carbazole derivative as doping material, and anthracene derivative of formula (12) or pyrene derivative of formula (13), as host material.A1,A2=group derived from 6-20C optionally substituted aromatic ring;R21-R28=6-50C aryl, 4-50C heteroaryl, 1-50C alkyl, 3-50C cycloalkyl, 1-50C alkoxy, 6-50C aralkyl, 6-50C aryloxy, 6-50C aryl thio, 1-50C alkoxycarbonyl or silyl (all optionally substituted), H, carboxyl, halo, cyano, nitro or hydroxyl;Ar15-Ar16=optionally substituted 6-50C aryl;L1,L2=phenylene, naphthalenylene, fluorenylene or dibenzosilolylene (all optionally substituted);s,q=0-2;p=1-4;andr=0-4.L1 or Ar5 is coupled with pyrene in 1-5 position. L2 or Ar6 is coupled with pyrene in 6-10 position. When p+r is even number, Ar5, Ar6, L1 and L2 is Ar5 and Ar6 and/or L1 and L2 are same or different. When Ar5=Ar6 and L1=L2, s and q and/or p and r are same or different. When s=q and p=r, L1 and L2 or Ar5 and Ar6 are coupled in same or different positions of pyrene. L1 and Ar5 are not substituted in 1 and 6 position of pyrene, and L2 and Ar6 are not substituted in 2 and 7 position of pyrene. Preferred Definitions:    Ar=optionally substituted naphthylene, anthracenylene, phenanthrylene, pyrenylene or benzoanthracenylene;    s-v=2-4;    A=carbazole group of formula (4-7);and    B'=carbazole group of formula (8-11).    A couples with 2-position of naphthylene, 2 and 9-position of anthracenylene, 2-position of phenanthrylene, 6-positionof chrysenylene, 1-position of pyrenylene and 7-position of benzo anthracenylene. B'couples with 6-position of naphthylene, 6 and 10-position of anthracenylene, 7-position of phenanthrylene, 12-position of chrysenylene, 6-position of pyrenylene and 12-position of benzo anthracenylene.    SPECIFIC COMPOUNDS - 110 carbazole derivatives are disclosed such as 9-(12-(3,6-bis(trimethylsilyl)-9H-carbazol-9-yl)chrysen-6-yl)-3,6-bis(trimethylsilyl)-9H-carbazole of formula (1a), 9-(12-(3,6-bis(triethylsilyl)-9H-carbazol-9-yl)chrysen-6-yl)-3,6-bis(triethylsilyl)-9H-carbazole, 9-(12-(2,7-dimethyl-3,6-bis(trimethylsilyl)-9H-carbazol-9-yl)chrysen-6-yl)-2,7-dimethyl-3,6-bis(trimethylsilyl)-9H-carbazole, 9-(12-(3,6-bis(triphenylsilyl)-9H-carbazol-9-yl)chrysen-6-yl)-3,6-bis(triphenylsilyl)-9H-carbazole and 9-(12-(9H-carbazol-9-yl)chrysen-6-yl)-3,6-bis(trimethylsilyl)-9H-carbazole.    EXAMPLE - 6,12-dibromo chrysene (in g) (3.8), 3,6-di-trimethyl silyl carbazole (7.7), copper iodide (94.5 mg), trans-1,2-diamino cyclohexane (283 mg), potassium phosphate (11.1) and dioxane were mixed, reacted at 110 degrees C for 8 hours, cooled to room temperature, filtered by adding toluene and purified using toluene and ethanol, to obtain 9-(12-(3,6-bis(trimethylsilyl)-9H-carbazol-9-yl)chrysen-6-yl)-3,6-bis(trimethylsilyl)-9H-carbazole (1a).