TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation: No preparation method is given. Preferred Components: (A) are at least 10% (preferably 100%) deuterated. Preferred Definitions:    Ar1 = pyridazin-3-yl, pyridazin-4-yl, pyrimidin-4-yl, pyrimidin-5-yl or pyrazin-2-yl (all optionally substituted by (R3)b), (1,3,5)triazin-2-yl, (1,2,4)triazin-3-yl, (1,2,4)triazin-5-yl or (1,2,4)triazin-6-yl (all optionally substituted by (R3)c), pyridin-2-yl, pyridin-3-yl or pyridin-4-yl (all optionally substituted by (R3)a), substituted quinoxalin-2-yl moieties of formula (IV), substituted (1,2,4)oxadiazol-5-yl moieties of formula (V), substituted (1,3,4)oxadiazol-2-yl moieties of formula (VI), substituted 1H-benzoimidazol-2-yl moieties of formula (VII), substituted isoquinolinyl moieties of formula (VIII), substituted quinolinyl moieties of formula (IX), substituted (1,10)phenanthrolinyl moieties of formula (X)-(XII) or substituted (1,7)phenanthrolinyl moieties of formula (XIII)-(XV);    Ar3 = aryl;    R3 = D, alkyl, alkoxy, aryl, aryloxy, siloxane or silyl;    a = 0-4;    b = 0-3;    c = 0-2;    d = 0-5;    e = 0-1;    Ar2 = phenyl, naphthyl, phenanthryl, anthracenyl, phenylnaphthylene, naphthylphenylene or their deuterated derivatives, or substituted phenyl moieties of formula (III); either    R4 = H, D, alkyl, alkoxy, siloxane or silyl; or    adjacent R4 = aromatic ring; and    m = 1-6.    EXAMPLE - 11-(4,6-Diphenyl-(1,3,5)triazin-2-yl)-12-phenyl-11,12-dihydro-11,12-diaza-indeno(2,1-a)fluorene (1 g) was dissolved in perfluorocyclohexane (19.6 ml) in a 100 ml round bottom flask and deuterated triflic acid (1.34 g) added to it. The resulting dark red solution was stirred at 50 degrees C for 5 hours. The reaction was quenched with deuterated water solution of sodium carbonate. The layers were separated and the organic layer washed with two 30 ml portions of water. The combined aqueous layers were extracted with methylene chloride (30 ml) and then dried over sodium sulfate, filtered, concentrated to dryness, and further purified by column chromatography to give deuterated 11-(4,6-diphenyl-(1,3,5)triazin-2-yl)-12-phenyl-11,12-dihydro-11,12-diaza-indeno(2,1-a)fluorene compounds of formula (A1).