TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: The device comprises a hole transport layer comprising (I), an electron blocking layer, a hole injection layer, and an emitting layer.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (Claimed): Preparation of (I) comprises adding organometallic nucleophiles to a carbonyl group. SPECIFIC COMPOUNDS - 133 Compounds (I) are disclosed e.g. N-(9,9-dimethylfluoren-2-yl)-N-(4-phenylphenyl)spiro(fluorene-9,9'-xanthene)-2-amine of formula (Q), N-(2,4-diphenylphenyl)-9,9-dimethyl-N-(3-(9-phenylxanthen-9-yl)phenyl)fluoren-2-amine, 4-phenyl-N-(4-phenylphenyl)-N-(3-(9-phenylxanthen-9-yl)phenyl)aniline, 9,9-dimethyl-N-(2-phenylphenyl)-N-(3-(9-phenylxanthen-9-yl)phenyl)fluoren-2-amine, and 4-dibenzofuran-4-yl-N-(4-phenylphenyl)-N-(3-(9-phenylxanthen-9-yl)phenyl)aniline.    EXAMPLE - 31.7 g of 1-Bromo-2-diphenylether was dissolved in a 400 ml of heated flask containing dried tetrahydrofuran (THF). The mixture was cooled at -78 degrees C. 55 ml of Solution of n-butyllithium was slowly added dropwise into 127 mmole of hexane at the same temperature. The mixture was stirred at -70 degrees C for 1 hour. 30 g of 2-Bromfluorenon was dissolved in 100 ml of THF and added dropwise at -70 degrees C. After completion of addition, the reaction mixture was slowly warmed to room temperature, quenched with ammonium chloride and evaporated. 300 ml of Acetic acid and 50 ml of fuming hydrochloric acid were added and worked up to give bromo-spirobifluorene xanthine derivative. 17.6 g of biphenyl-4-yl-(9,9-dimethyl-9H-fluoren-2-yl)-amine and 20 g of bromo-spirobifluorene xanthine derivative were dissolved in a 400 ml of THF. The solution was degassed and saturated with nitrogen. 2.43 ml of tri-tert-butylphosphine and 1 M solution of 0.27 g of palladium (II)acetate and 14 g of sodium-tert-butoxide were added. The mixture was heated for 6 hours under protective atmosphere for simmering. The mixture was distributed between toluene and water and washed with water, dried over sodium sulfate and concentrated by rotary evaporation. After filtration of the crude product over silica gel with toluene, the residue was recrystallized from heptane/toluene, and recrystallized in high vacuum to obtain 27 g of N-(9,9-dimethylfluoren-2-yl)-N-(4-phenylphenyl)spiro(fluorene-9,9'-xanthene)-2-amine with purity of 99.9%.