TECHNOLOGY FOCUS - ELECTRONICS - Preferred Components: The photoactive layer comprises or consists essentially of the electroactive compound (II) and further comprises a host material.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation: No preparation method is given. Preferred Components: (II) are at least 10% deuterated. Preferred Definitions:    R1 = alkyl or deuterated alkyl having 1-6C, preferably 1-3C;    R2 = alkyl or deuterated alkyl (having 1-6C), hydrocarbon aryl or deuterated hydrocarbon aryl (having 6-12 ring carbons), or alkylaryl or deuterated alkylaryl (having 6-20C), where R2 is meta to R1; and    a, b, c = greater than 0.    SPECIFIC COMPOUNDS - 10 Compounds (II) are specifically claimed e.g. iridium tris(2-(4-(4-tert-butyl-phenyl)-5-ortho-tolyl-4H-(1,2,4)triazol-3-yl)-phenyl) complex of formula (Ia), iridium tris(2-(4-(4-tert-butyl-phenyl)-5-(2,6-dimethyl-phenyl)-4H-(1,2,4)triazol-3-yl)-phenyl) complex, iridium tris(2-(5-(2,6-dimethyl-phenyl)-4-ortho-tolyl-4H-(1,2,4)triazol-3-yl)-phenyl) complex, iridium tris(2-(4-(2,6-diisopropyl-phenyl)-5-ortho-tolyl-4H-(1,2,4)triazol-3-yl)-phenyl) complex, and iridium tris(2-(4-(4-butyl-2-methyl-phenyl)-5-(2,6-dimethyl-phenyl)-4H-(1,2,4)triazol-3-yl)-phenyl) complex.    EXAMPLE - 10-ml Stainless steel pressure tube was charged with a premixed powder containing 1.29 g 4-(4-(tert-butyl)phenyl)-3-phenyl-5-(ortho-tolyl)-4H-1,2,4-triazole and 0.34 g tris(acetylacetonate)iridium. The tube was evacuated and refilled with nitrogen gas to 0 psig three times, and then heated to 250 degrees C for 3 days. After cooling to room temperature the crude material was removed from the tube by rinsing with methanol followed by dichloromethane. The washes were concentrated under reduced pressure to give 1.55 g of crude product. The product was purified by column chromatography on silica gel using 2% acetone in dichloromethane to give 0.57 g iridium tris(2-(4-(4-tert-butyl-phenyl)-5-ortho-tolyl-4H-(1,2,4)triazol-3-yl)-phenyl) complex.