TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The organic electronic device comprises at least one metal(s) comprising organometals of group 1, group 2, 4th period and 5th period transition metals, lanthanide metals or d-transition elements.    TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: The organic layer comprises an electroluminescent layer and a charge generating layer.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (Disclosed): Preparation of (I) comprises reacting fused heterocyclic aromatic compounds of formula (III) with N-bromo succinimide in the presence of a boronic acid compounds of formula (R1-L1-B(OH)2) to give (I). Preferred Components: The organic layer comprises at least one compound(s) comprising arylamine compounds or styrylarylamine compounds. Preferred Definitions:    R1-R3 = H, D, or 52 fused heterocyclic aromatic moieties e.g. adamantly, pyrimidinyl, acenaphthenyl, 10,11-dihydro-5H-dibenzo(b,f)azepin-5-yl and 5H-dibenzo(b,f)azepin-5-yl.    SPECIFIC COMPOUNDS - 1526 Compounds (A) are disclosed e.g. 8,8-dimethyl-3,6-diphenyl-8H-indolo(3,2,1-de)acridine of formula (Ia), 8,8-dimethyl-3-phenyl-8H-indolo(3,2,1-de)acridine, 8,8-dimethyl-3-naphthalen-1-yl-8H-indolo(3,2,1-de)acridine, 8,8-dimethyl-3-naphthalen-2-yl-8H-indolo(3,2,1-de)acridine and 3-(9,9-dimethyl-9H-fluoren-2-yl)-8,8-dimethyl-8H-indolo(3,2,1-de)acridine.    EXAMPLE - 8,8-Dimethyl-8H-indolo(3,2,1-de)acridine (7 g) was dissolved in dichloromethane (100 ml), and N-bromosuccinimide (10.5 g) was added to it at 0 degrees C. The solution was stirred for 5 hours, while maintaining the temperature. Then the reaction was quenched by adding distilled water (150 ml), and the mixture was extracted with dichloromethane (100 ml), and the extract was evaporated under reduced pressure with recrystallization to give 3,6-dibromo-8,8-dimethyl-8H-indolo(3,2,1-de)acridine. 3,6-Dibromo-8,8-dimethyl-8H-indolo(3,2,1-de)acridine (5 g), phenylboronic acid (3.8 g) and triphosphenephenyl palladium(IV) (1.6 g) were dissolved in toluene (100 ml) and ethanol (50 ml), and aqueous 2M sodium carbonate solution (50 ml) was added to it. After stirring under reflux at 120 degrees C for 4 hours, the reaction mixture was cooled to 25 degrees C, and the reaction was quenched by adding distilled water (200 ml). The mixture was extracted with ethyl acetate (150 ml), and the extract was evaporated under reduced pressure, and purified to give 8,8-dimethyl-3,6-diphenyl-8H-indolo(3,2,1-de)acridine (3.9 g).