Materials for electronic devices
AssigneeMerck Patent GmbH
InventorsArne Buesing, Holger Heil, Christof Pflumm, Joachim Kaiser
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Abstract
The invention relates to an organic electroluminescent device comprising an anode and a cathode and at least one electroluminescent layer arranged between the anode and cathode which comprises at least one compound of the formula (I) and at least one compound of the formula (II). The invention furthermore relates to the production of an organic electroluminescent device by means of a sublimation process and/or by application from solution and to a mixture comprising at least one compound of the formula (I) and at least one compound of the formula (II).
Claims5
An organic electroluminescent device comprising an anode and a cathode and at least one electroluminescent layer arranged between the anode and cathode, wherein the electroluminescent layer comprises at least one compound of the formula (I)
- and at least one compound of the formula (IIa),
- where the compound of the formula (I) is substituted by hydrogen at all free positions of the anthracene ring system and where the compound of the formula (IIa) is substituted by hydrogen at all free positions of the anthracene and benzanthracene ring system and where the following furthermore applies to the symbols occurring:
- A is selected on each occurrence, identically or differently, from the following groups
- where the symbol * denotes the bond to the anthracene group;
- Ar1 is selected on each occurrence, identically or differently, from the following groups
- where the symbol * denotes the bond to the nitrogen atom and wherein the groups Ar1 bonded to the same nitrogen atom in the compound of formula (I) are not identical;
- Ar2 is selected on each occurrence, identically or differently, from the following groups
- where the symbol * denotes the bond to the anthracene ring system, and the groups Ar2 is substituted by hydrogen at all free positions;
- R5 is on each occurrence H, and
- wherein the bond between the benzanthracene group and the anthracene group in the compound of the formula (IIa) is in the 4-position of the benzanthracene group.
A mixture comprising at least one compound of the formula (I)
- and at least one compound of the formula (IIa)
- where the compound of the formula (I) is substituted by hydrogen at all free positions of the anthracene ring system and where the compound of the formula (IIa) is substituted by hydrogen at all free positions of the anthracene and benzanthracene ring system and where the following furthermore applies to the symbols occurring:
- A is selected on each occurrence, identically or differently, from the following groups
- where the symbol * denotes the bond to the anthracene group;
- Ar1 is selected on each occurrence, identically or differently, from the following groups:
- and wherein the groups Ar1 bonded to the same nitrogen atom in the compound of formula (I) are not identical;
- Ar2 is selected on each occurrence, identically or differently, from the following groups
- where the symbol * denotes the bond to the anthracene ring system, and the groups Ar2 is substituted by hydrogen at all free positions;
- R5 is, on each occurrence, H;
- and wherein the bond between the benzanthracene group and the anthracene group in the compound of the formula (II) is in the 4-position of the benzanthracene group.
Dependencies are inferred from the claim text.