| 摘要 |
Electroluminescent device comprising in this order (a) an anode (b) a hole transporting layer (c) a light-emitting layer (d) optionally an electron transporting layer and (e) a cathode and a light-emitting substance, wherein the light-emitting substance is a diketopyrrolopyrrole represented by formula I or formula III wherein R1 and R2, independently from each other, stand for C1-C25-alkyl, allyl which can be substituted one to three times with C1-C3alkyl or Ar3, or -CR3R4-(CH2)m-Ar3, wherein R3 and R4 independently from each other stand for hydrogen or C1-C4alkyl, or phenyl which can be substituted one to three times with C1-C3 alkyl, Ar3 stands for phenyl or 1- or 2-naphthyl which can be substituted one to three times with C1-C8alkyl, C1-C8alkoxy, halogen or phenyl, which can be substituted with C1-C8alkyl or C1-C8alkoxy one to three times, and m stands for 0, 1, 2, 3 or 4, Ar1 and Ar2, independently from each other, stand for aryl radicals, preferably for wherein R5, R6 and R7, independently from each other, stand for hydrogen, cyano, halogen, C1-C6alkyl, -NR8R9, -OR10, -S(O)nR8, -Se(O)nR8, or phenyl, which can be substituted one to three times with C1-C8alkyl or C1-C8alkoxy, wherein R8 and R9, independently from each other, stand for hydrogen, phenyl, C1-C25-alkyl, C5-C12-cycloalkyl, -CR3R4-(CH2)m-Ph, R10, wherein R10 stands for C6<
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