| 主权项 |
1. An organic electroluminescent device which comprises an emitting layer which consists of a mixture of at least two materials A and B in an unequal mixing ratio, where the concentration of material A is lower than the concentration of material B, and which comprises an additional layer which is a non-luminous layer and which consists of a mixture of the same materials A and B as the emitting layer, wherein material A, which has the lower proportion of the two materials in the emitting layer, is present in a higher proportion than material B in this additional layer, wherein the material A has a concentration of less than 30% by vol. in the emitting layer and the material B has a proportion of greater than 70% by vol. in the emitting layer,
wherein the proportion of material A in the additional layer which comprises the same materials A and B as the emitting layer is greater than 80% by vol. and in that the proportion of material B is less than 20% by vol. and wherein the material B is a compound of the following formula (8):
Ar4-Ant-Ar4 formula (8) where R1 is on each occurrence, identically or differently, H, D, F, Cl, Br, I, CHO, C(═O)Ar3, P(═O)(Ar3)2, S(═O)Ar3, S(═O)2Ar3, CR2═CR2Ar3, CN, NO2, Si(R2)3, B(OR2)2, B(R2)2, B(N(R2)2)2, OSO2R2, a straight-chain alkyl, alkoxy or thioalkoxy group having 1 to 40 C atoms or a straight-chain alkenyl or alkynyl group having 2 to 40 C atoms or a branched or cyclic alkyl, alkenyl, alkynyl, alkoxy or thioalkoxy group having 3 to 40 C atoms, each of which may be substituted by one or more radicals R2, where one or more non-adjacent CH2 groups may be replaced by R2C═CR2, C≡C, Si(R2)2, Ge(R2)2, Sn(R2)2, C═O, C═S, C═Se, C═NR2, P(═O)(R2), SO, SO2, NR2, O, S or CONR2 and where one or more H atoms may be replaced by F, Cl, Br, I, CN or NO2, or an aromatic or heteroaromatic ring system having 5 to 60 aromatic ring atoms, which may in each case be substituted by one or more radicals R2, or an aryloxy or heteroaryloxy group having 5 to 60 aromatic ring atoms, which may be substituted by one or more radicals R2, or a combination of these systems; two or more adjacent substituents R1 here may also form a mono- or polycyclic, aliphatic or aromatic ring system with one another; Ar3 is on each occurrence, identically or differently, an aromatic or heteroaromatic ring system having 5 to 40 aromatic ring atoms, which may be substituted by one or more radicals R2; R2 is on each occurrence, identically or differently, H, D, CN or an aliphatic, aromatic and/or heteroaromatic hydrocarbon radical having 1 to 20 C atoms, in which, in addition, H atoms may be replaced by F; two or more adjacent substituents R2 here may also form a mono- or polycyclic, aliphatic or aromatic ring system with one another and the following applies to the other symbols used: Ant stands for an anthracene group which is substituted in the 9- and 10-position by the groups Ar4 and which may furthermore be substituted by one or more substituents R1; Ar4 is, identically or differently on each occurrence, an aromatic or heteroaromatic ring system having 5 to 60 aromatic ring atoms, which may be substituted by one or more radicals R1. |
