TECHNOLOGY FOCUS - ELECTRONICS - Preferred Device: The device (D1) comprises a first electrode; a second electrode; and at least one organic layer(s) interposed between the first electrode and the second electrode, where the organic layer comprises an electroluminescent region containing the complex (I), and dopant of formula M2L3L4L5.M2=Group 7, 8, 9, 10, 11, 13, 14, 15 and 16 in the Periodic Table;L3-L5=group of formulae (vi)-(xxx);R61 and R62=H, 1-20C alkyl (which is optionally substituted with halogen), phenyl (which is optionally substituted with 1-20C alkyl) or halogen;R63-R79, R82 and R83=H, 1-20C (which is optionally substituted with halogen), 1-20C alkoxy, phenyl (which is optionally substituted with 1-20C alkyl), SF5, tri-1-20C alkylsilyl or halogen;R80, R81, R84 and R85=H, 1-20C alkyl or phenyl (which is optionally substituted with 1-20C alkyl);R86=1-20C alkyl, phenyl (which is optionally substituted with 1-20C alkyl) or halogen;R87 and R88=H, 1-20C alkyl (which is optionally substituted with halogen), phenyl (which is optionally substituted with 1-20C alkyl) or halogen;Z1=group of formulae (xxxi)-(xxxiii);R101-R112=H, 1-20C alkyl (which is optionally substituted with halogen), alkoxy, halogen, phenyl, ketone, cyano or 5-7C cycloalkyl).The R101-R112 and another adjacent group from R101-R112 are linked via alkylene or alkenylene to form 5-7C spiro ring or 5-9C fused ring. The R101-R112 is linked to R67 or R68 via alkylene or alkenylene to form 5-7C fused ring. Preferred Components: The organic layer comprises an electroluminescent layer and a charge generating layer. The mixed region of reductive dopant and organic substance, or a mixed region of oxidative dopant and organic substance is placed on the inner surface of one or both electrode(s) among the pair of electrodes. The organic layer comprises arylamine compounds and styrylarylamine compounds, or at least one metal selected from Group 1, Group 2, Group 4 and Group 5 period transition metals, lanthanide metals and d-transition elements.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation: No general method for the preparation of the complex (I) is given. Preferred Definitions:    M1=Be, Zn, Mg, Cu or Ni.    SPECIFIC COMPOUNDS - 1950 Compounds are disclosed as the complex (I) e.g. complexes of formulae (Ia)-(Ie).    EXAMPLE - 2-Benzothiazol-2-ylmethyl-phenol (3.5 g) and sodium hydroxide (0.6 g) were dissolved in ethanol (100 ml), and the solution was stirred for 30 minutes. To the solution, slowly added was Zn(CH3COO)2.2H2O (1.8 g), and the resultant mixture was stirred at room temperature for 12 hours. When the reaction was completed, the reaction mixture was washed with water (200 ml), ethanol (200 ml) and hexane (200 ml), sequentially, and filtered under reduced pressure to obtain electroluminescent zinc complex of formula (Ia) (3.5 g, yield 45%).