TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: The electronic device comprises an anode, a cathode and at least one organic layer.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (Claimed): Preparation of (Q) comprises using at least one transition metal-catalyzed coupling reaction. Preferred Method: The condensation of indeno groups to the carbazole groups in the Cbz group takes place in the 2 and 3 positions and/or the positions 6 and 7. Preferred Components: (Q) do not contain condensed aryl- or heteroaryl having more than 14 aryl ring atoms. SPECIFIC COMPOUNDS - 38 Compounds (I) are specifically claimed, e.g. 10-(3-(4,6-diphenyl-pyrimidin-2-yloxy)-phenyl)-12,12-dimethyl-10,12-dihydro-10-aza-indeno(2,1-b)fluorene of formula (Ia), 10-(3-(4,6-bis-biphenyl-4-yl-pyrimidin-2-yloxy)-phenyl)-12,12-dimethyl-10,12-dihydro-10-aza-indeno(2,1-b)fluorene, 10-(3-(4,6-di-naphthalen-1-yl-pyrimidin-2-yloxy)-phenyl)-12,12-dimethyl-10,12-dihydro-10-aza-indeno(2,1-b)fluorene, 10-(3-(4,6-di-p-tolyl-pyrimidin-2-yloxy)-phenyl)-12,12-dimethyl-10,12-dihydro-10-aza-indeno(2,1-b)fluorene, and 11-(3-(4,6-diphenyl-pyrimidin-2-ylsulfanyl)-phenyl)-12,12-dimethyl-11,12-dihydro-11-aza-indeno(2,1-a)fluorene.    EXAMPLE - 3.32 g of Sodium hydride was suspended in 200 ml of dimethylformamide. Then, 24 g of 3-(12,12-dimethyl-12H-10-azaindeno(2,1-b)fluorene-10-yl)-phenol dissolved in 100 ml of dimethylformamide was slowly added using a dropping funnel at room temperature to the reaction mixture. After one hour, 18.75 g of 2-chloro-4,6-biphenylpyrimidine dissolved in 150 ml of anhydrous tetrahydrofuran was slowly added dropwise to the reaction mixture and stirred for 3 hours at room temperature until the reaction was completed. The reaction mixture was poured onto 300 ml of ice and warmed under stirring at room temperature. The precipitated solid was filtered and washed with 300 ml of ethanol and 300 ml of n-heptane. The solid was recrystallized from toluene, and then sublimated in a high vacuum to obtain 10-(3-(4,6-diphenyl-pyrimidin-2-yloxy)-phenyl)-12,12-dimethyl-10,12-dihydro-10-aza-indeno (2,1-b)fluorene.