| abstract |
The invention relates to an electroluminescent device in which the luminescent layer contains a luminescent compound and a compound of the general formula I as a dopant, where B is an unsaturated carbocyclic or heterocyclic 4-8-membered ring which can also have an alicyclic bridge which Rings D and E are five- or six-membered rings, each of which may contain a further heteroatom N, O, S; the radicals R are one or more substituents H or straight-chain or branched C 1 -C 6 -alkyl; X and Y are carbon or nitrogen; R 1 , R 2 and R 9 are H or straight-chain or branched C 1 -C 6 alkyl; R 3 and R 8 are hydrogen, straight-chain or branched C 1 -C 6 -alkyl, hydroxy, -OR 16 , -COOR 16 , N, N-dialkylamino, acetylamino or halogen, where R 16 is hydrogen, or straight-chain or branched C 1 Is -C 6 alkyl; R 1 and R 2 or R 2 and R 3 and / or R 8 and R 9 together can form an alicyclic, heterocyclic or aromatic ring; and A 1 and A 2 , the same or different, are cyan, nitro or -COOR 16 . The compounds I are partly new. The dopants, together with the luminescent compound, shine red or white depending on the concentration with very good quantum efficiency. |