Patent ID: 7001677

Claim:
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 (“DPP”) represented by formula I or formula III wherein R 1 and R 2 , independently from each other, stand for C 1 –C 25 -alkyl, allyl which can be substituted one to three times with C 1 –C 3 alkyl or Ar 3 , or —CR 3 R 4 —(CH 2 ) m —Ar 3 , wherein R 3 and R 4 independently from each other stand for hydrogen, C 1 –C 4 alkyl, or phenyl which can be substituted one to three times with C 1 –C 3 alkyl, Ar 3 stands for phenyl or 1- or 2-naphthyl which can be substituted one to three times with C 1 –C 8 alkyl, C 1 –C 8 alkoxy, halogen or phenyl, which can be substituted with C 1 –C 8 alkyl or C 1 –C 8 alkoxy one to three times, and m stands for 0, 1, 2, 3 or 4, Ar 1 and Ar 2 , independently from each other, stand for or phenanthryl, 2- or 9-fluorenyl, or anthracenyl, wherein R 5 , R 6 and R 7 , independently from each other, stand for hydrogen, cyano, halogen, C 1 –C 6 alkyl, —NR 8 R 9 , —OR 10 , —S(O) n R 8 , —Se(O) n R 8 , or phenyl, which can be substituted one to three times with C 1 –C 8 aIkyl or C 1 –C 8 alkoxy, wherein R 8 and R 9 , independently from each other, stand for hydrogen, phenyl, C 1 –C 25 -alkyl, C 5 –C 12 -cycloalkyl, —CR 3 R 4 —(CH 2 ) m -Ph, R 10 , wherein R 10 stands for C 6 –C 24 -aryl, or a saturated or unsaturated heterocyclic radical comprising five to seven ring atoms, wherein the ring consists of carbon atoms and one to three hetero atoms selected from the group consisting of nitrogen, oxygen and sulfur, wherein Ph, the aryl and heterocyclic radical can be substituted one to three times with C 1 –C 8 alkyl, C 1 –C 8 alkoxy, or halogen, or R 8 and R 9 stand for —C(O)R 11 , wherein R 11 can be C 1 –C 25 -alkyl, C 5 –C 12 -cycloalkyl, R 10 , —OR 12 or —NR 13 R 14 , wherein R 12 , R 13 , and R 14 stand for C 1 –C 25 -alkyl, C 5 –C 12 -cycloalkyl, C 6 –C 24 -aryl, or R 5 , R 6 and R 7 stand for a saturated or unsaturated heterocyclic radical comprising five to seven ring atoms, wherein the ring consists of carbon atoms and one to three hetero atoms selected from the group consisting of nitrogen, oxygen and sulfur, wherein the heterocyclic radical can be substituted one to three times with C 1 –C 8 alkyl or C 1 –C 8 alkoxy, or —NR 8 R 9 stands for a five- or six membered heterocyclic radical in which R 8 and R 9 together stand for tetramethylene, pentamethylene, —CH 2 —CH 2 —O—CH 2 —CH 2 —, or —CH 2 —CH 2 —NR 50 —CH 2 —CH 2 —, wherein R 50 stands for hydrogen, C 1 –C 6 alkyl, phenyl or phenyl substituted one to three times with C 1 –C 8 alkyl or C 1 –C 8 alkoxy and n stands for 0, 1, 2 or 3, and wherein Z stands for a diradical selected from the group consisting of a single bond, C 2 –C 6 alkylene, which can be substituted one to three times with C 1 –C 4 alkyl, C 1 –C 4 alkoxy, or phenyl, phenylene or naphthylene.