Organic electroluminescent device comprising an anode, a cathode and at least one organic layer, comprising at least one light-emitting layer, where the at least one light-emitting layer comprises at least one compound of the formula as host material 1 and at least one compound of the formula as host material 2, where the following applies to the symbols and indices used: X is on each occurrence, identically or differently, CR 0 or N, with the proviso that at least two groups X stand for N; Y is selected from O or S; L is on each occurrence, identically or differently, a single bond or a linker L-1 to L-13, where the linkers L-1 to L-13 may also be substituted by one or more substituents R and the dashed line denotes the respective bond to the remainder of the formula; R is selected on each occurrence, identically or differently, from the group consisting of CN, a straight-chain alkyl, alkoxy or thioalkyl group having 1 to 20 C atoms or a branched or cyclic alkyl, alkoxy or thioalkyl group having 3 to 20 C atoms, an aromatic or hetero-aromatic ring system having 5 to 40 aromatic ring atoms, an aryloxy or heteroaryloxy group having 5 to 40 aromatic ring atoms, or an aralkyl or heteroaralkyl group having 5 to 40 aromatic ring atoms; Ar 1, Ar 2 are on each occurrence, in each case independently of one another, an aryl or heteroaryl group having 5 to 40 aromatic ring atoms, which may be substituted by one or more radicals R; A is on each occurrence, independently of one another, a group of the formula or, Ar is on each occurrence, in each case independently of one another, an aryl group having 6 to 40 aromatic ring atoms, which may be substituted by one or more radicals R, or a heteroaryl group having 5 to 40 aromatic ring atoms, containing O as heteroatom, which may be substituted by one or more radicals R; * denotes the bonding site to the formula; a, b, c on each occurrence, in each case independently of one another, denote 0 or 1, where the sum of the indices on each occurrence a+b+c denotes 1; n and m on each occurrence, independently of one another, denote 0, 1, 2 or 3; o on each occurrence, independently, denotes 0, 1, 2, 3, 4, 5, 6 or 7; p on each occurrence, independently, denotes 0, 1, 2, 3, 4, 5, 6, 7 or 8; q, r, s, t on each occurrence, in each case independently, denote 0 or 1; R° is on each occurrence, independently of one another, H or an unsubstituted or partially or fully deuterated aromatic ring system having 6 to 18 C atoms. X is on each occurrence, identically or differently, CR 0 or N, with the proviso that at least two groups X stand for N; Y is selected from O or S; L is on each occurrence, identically or differently, a single bond or a linker L-1 to L-13, where the linkers L-1 to L-13 may also be substituted by one or more substituents R and the dashed line denotes the respective bond to the remainder of the formula; R is selected on each occurrence, identically or differently, from the group consisting of CN, a straight-chain alkyl, alkoxy or thioalkyl group having 1 to 20 C atoms or a branched or cyclic alkyl, alkoxy or thioalkyl group having 3 to 20 C atoms, an aromatic or hetero-aromatic ring system having 5 to 40 aromatic ring atoms, an aryloxy or heteroaryloxy group having 5 to 40 aromatic ring atoms, or an aralkyl or heteroaralkyl group having 5 to 40 aromatic ring atoms; Ar 1, Ar 2 are on each occurrence, in each case independently of one another, an aryl or heteroaryl group having 5 to 40 aromatic ring atoms, which may be substituted by one or more radicals R; A is on each occurrence, independently of one another, a group of the formula or, Ar is on each occurrence, in each case independently of one another, an aryl group having 6 to 40 aromatic ring atoms, which may be substituted by one or more radicals R, or a heteroaryl group having 5 to 40 aromatic ring atoms, containing O as heteroatom, which may be substituted by one or more radicals R; * denotes the bonding site to the formula; a, b, c on each occurrence, in each case independently of one another, denote 0 or 1, where the sum of the indices on each occurrence a+b+c denotes 1; n and m on each occurrence, independently of one another, denote 0, 1, 2 or 3; o on each occurrence, independently, denotes 0, 1, 2, 3, 4, 5, 6 or 7; p on each occurrence, independently, denotes 0, 1, 2, 3, 4, 5, 6, 7 or 8; q, r, s, t on each occurrence, in each case independently, denote 0 or 1; R° is on each occurrence, independently of one another, H or an unsubstituted or partially or fully deuterated aromatic ring system having 6 to 18 C atoms.