| abstract |
An electroluminescent material comprises the following structural unit: n n n n n n n n n n n n where X is selected from a group consisting of NR, O, S, SO, SO 2 , CR 2 , PR, POR, BR, SiR 2 ; where R is a substituent group and Ar 1 and Ar 2 comprise aromatic rings; and, wherein Ar 1 or Ar 2 is fused to a further aryl system Ar 3 . An optical device comprises a first electrode for injection of positive charge carriers, a second electrode for injection of negative charge carriers and a layer located between the first and second electrode comprising the electroluminescent material. |