Organic electroluminescent device comprising anode, cathode, at least one emitting layer and at least one electron-transport layer which is arranged between the emitting layer and the cathode, where the electron-transport layer comprises at least one compound of the formula or, where the following applies to the symbols used: R 1 is on each occurrence, identically or differently, H, D, F, Cl, Br, I, CHO, N(R 3) 2, N(Ar 1) 2, B(Ar 1) 2, C(=O)Ar 1, P(=O)(Ar 1) 2, S(=O)Ar 1, S(=O) 2 Ar 1, CR 3 =CR 3 Ar 1, CN, NO 2, Si(R 3) 3, B(OR 3) 2, B(R 3) 2, B(N(R 3) 2) 2, OSO 2 R 3, a straight-chain alkyl, alkenyl, alkynyl, alkoxy or thioalkoxy group having 1 to 40 C atoms or a branched or cyclic alkyl, alkenyl, alkynyl, alkoxy or thioalkoxy group having 3 to 40 C atoms, which may in each case be substituted by one or more radicals R 3, where one or more non-adjacent CH2 groups may be replaced by R 3 C=CR 3, C≡C, Si(R 3) 2, Ge(R 3) 2, Sn(R 3) 2, C=O, C=S, C=Se, C=NR 3, P(=O)(R 3), SO, SO 2, NR 3, O, S or CONR 3 and where one or more H atoms may be replaced by D, F, Cl, Br, I, CN or NO 2, 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 R 3, or an aryloxy or heteroaryloxy group having 5 to 60 aromatic ring atoms, which may be substituted by one or more radicals R 3, or a combination of these systems; two or more adjacent substituents R 1 may also form a mono- or polycyclic, aliphatic or aromatic ring system with one another; R 3 is on each occurrence, identically or differently, H, D 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 D or F; two or more adjacent substituents R 3 may also form a mono- or polycyclic, aliphatic or aromatic ring system with one another; Ar 1 is on each occurrence, identically or differently, an aromatic or heteroaromatic ring system having 5 to 30 aromatic ring atoms, which may be substituted by one or more radicals R 3; two radicals Ar 1 which are bonded to the same nitrogen, phosphorus or boron atom may also be linked to one another by a single bond or a bridge selected from B(R 3), C(R 3)2, Si(R 3) 2, C=O, C=NR 3, C=C(R 3) 2, O, S, S=O, SO 2, N(R 3), P(R 3) and P(=O)R 3; Ar 2 is, identically or differently on each occurrence, a monovalent aromatic or heteroaromatic ring system having 5 to 60 aromatic ring atoms, which may in each case be substituted by one or more radicals R 1; Ar 3 is a divalent aromatic or heteroaromatic ring system having 5 to 60 aromatic ring atoms, which may be substituted by one or more radicals R 1; characterised in that the electron-transport layer is doped with an organic alkali-metal compound, i.e. in that a mixture of the compound of the formula or and an organic alkali-metal compound is present, or in that a further layer which comprises an organic alkali-metal compound has been introduced between the electron-transport layer comprising the compound of the formula or and the cathode. R 1 is on each occurrence, identically or differently, H, D, F, Cl, Br, I, CHO, N(R 3) 2, N(Ar 1) 2, B(Ar 1) 2, C(=O)Ar 1, P(=O)(Ar 1) 2, S(=O)Ar 1, S(=O) 2 Ar 1, CR 3 =CR 3 Ar 1, CN, NO 2, Si(R 3) 3, B(OR 3) 2, B(R 3) 2, B(N(R 3) 2) 2, OSO 2 R 3, a straight-chain alkyl, alkenyl, alkynyl, alkoxy or thioalkoxy group having 1 to 40 C atoms or a branched or cyclic alkyl, alkenyl, alkynyl, alkoxy or thioalkoxy group having 3 to 40 C atoms, which may in each case be substituted by one or more radicals R 3, where one or more non-adjacent CH2 groups may be replaced by R 3 C=CR 3, C≡C, Si(R 3) 2, Ge(R 3) 2, Sn(R 3) 2, C=O, C=S, C=Se, C=NR 3, P(=O)(R 3), SO, SO 2, NR 3, O, S or CONR 3 and where one or more H atoms may be replaced by D, F, Cl, Br, I, CN or NO 2, 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 R 3, or an aryloxy or heteroaryloxy group having 5 to 60 aromatic ring atoms, which may be substituted by one or more radicals R 3, or a combination of these systems; two or more adjacent substituents R 1 may also form a mono- or polycyclic, aliphatic or aromatic ring system with one another; R 3 is on each occurrence, identically or differently, H, D 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 D or F; two or more adjacent substituents R 3 may also form a mono- or polycyclic, aliphatic or aromatic ring system with one another; Ar 1 is on each occurrence, identically or differently, an aromatic or heteroaromatic ring system having 5 to 30 aromatic ring atoms, which may be substituted by one or more radicals R 3; two radicals Ar 1 which are bonded to the same nitrogen, phosphorus or boron atom may also be linked to one another by a single bond or a bridge selected from B(R 3), C(R 3)2, Si(R 3) 2, C=O, C=NR 3, C=C(R 3) 2, O, S, S=O, SO 2, N(R 3), P(R 3) and P(=O)R 3; Ar 2 is, identically or differently on each occurrence, a monovalent aromatic or heteroaromatic ring system having 5 to 60 aromatic ring atoms, which may in each case be substituted by one or more radicals R 1; Ar 3 is a divalent aromatic or heteroaromatic ring system having 5 to 60 aromatic ring atoms, which may be substituted by one or more radicals R 1;