| abstract |
The present invention relates to a compound of the formula (I) wherein A 1 and A 2 are independently of each other, and (II) wherein R 1 , R 2 and R 5 to R 11 are as defined in claim 1 Fluorescent diketopyrrolopyrrole ("DPP"), its preparation method and ink, colorant, colored plastic for paint, non-impact print material, color filter, preparation of cosmetics, or polymer ink particles, It relates to toners, dye lasers and their use for the preparation of electroluminescent devices. Fluorescent diketopyrrolopyrroles ("DPP") of the formula (I) exhibit high lightfastness, especially in plastics, high thermal stability. A light-emitting element containing the DPP compound of the formula (I) has high use efficiency of electric energy, high luminance, and high color purity. |