Heterocyclic compounds comprising dibenzofuran and/or dibenzothiophene structures

A compound of formula (I):

• wherein:
• Y is O or S;
• X is the same or different in each instance and is N or CR1, with the proviso that not more than two of the X groups in one cycle are N, and C is the attachment site of the L2 group;
• Q1 and Q2
• are in each case independently an electron-transporting group;
• L1 and L2
• are in each case independently a bond or an aromatic or heteroaromatic ring system which has 5 to 30 aromatic ring atoms, which are optionally substituted by one or more R1 radicals;
• R1 is the same or different in each instance and is H, D, F, Cl, Br, I, B(OR2)2, CHO, C(═O)R2, CR2═C(R2)2, CN, C(═O)OR2, C(═O)N(R2)2, Si(R2)3, N(R2)2, NO2, P(═O)(R2)2, OSO2R2, OR2, S(═O)R2, S(═O)2R2, a straight-chain alkyl, alkoxy, or thioalkoxy group having 1 to 40 carbon atoms or a branched or cyclic alkyl, alkoxy, or thioalkoxy group having 3 to 40 carbon atoms, each of which is optionally substituted by one or more R2 radicals, wherein one or more nonadjacent CH2 groups are optionally replaced by —R2C═CR2—, —C≡C—, Si(R2)2, C═O, C═S, C═NR2, —C(═O)O—, —C(═O)NR2—, NR2, P(═O)(R2), —O—, —S—, SO, or SO2 and wherein one or more hydrogen atoms are optionally replaced by D, F, Cl, Br, I, CN, or NO2, or an aromatic or heteroaromatic ring system which has 5 to 40 aromatic ring atoms and is optionally substituted in each case by one or more R2 radicals, or an aryloxy or heteroaryloxy group which has 5 to 40 aromatic ring atoms and is optionally substituted by one or more R2 radicals, or a combination of these systems;
• and wherein two or more adjacent R1 substituents together optionally define a mono- or polycyclic, aliphatic or aromatic ring system;
• R2 is the same or different in each instance and is H, D, F, Cl, Br, I, B(OR3)2, CHO, C(═O)R3, CR3═C(R3)2, CN, C(═O)OR3, C(═O)N(R3)2, Si(R3)3, N(R3)2, NO2, P(═O)(R3)2, OSO2R3, OR3, S(═O)R3, S(═O)2R3, a straight-chain alkyl, alkoxy, or thioalkoxy group having 1 to 40 carbon atoms or a branched or cyclic alkyl, alkoxy, or thioalkoxy group having 3 to 40 carbon atoms, each of which is optionally substituted by one or more R3 radicals, wherein one or more nonadjacent CH2 groups are optionally replaced by —R3C═CR3—, —C≡C—, Si(R3)2, C═O, C═S, C═NR3, —C(═O)O—, —C(═O)NR3—, NR3, P(═O)(R3), —O—, —S—, SO, or SO2 and wherein one or more hydrogen atoms are optionally replaced by D, F, Cl, Br, I, CN, or NO2, or an aromatic or heteroaromatic ring system which has 5 to 40 aromatic ring atoms and is optionally substituted in each case by one or more R3 radicals, or an aryloxy or heteroaryloxy group which has 5 to 40 aromatic ring atoms and is optionally substituted by one or more R3 radicals, or a combination of these systems;
• and wherein two or more adjacent R2 substituents together optionally define a mono- or polycyclic, aliphatic or aromatic ring system;
• R3 is the same or different in each instance and is H, D, F, or an aliphatic, aromatic and/or heteroaromatic hydrocarbyl radical having 1 to 20 carbon atoms, wherein hydrogen atoms are optionally replaced by F;
• and wherein two or more adjacent R3 substituents together optionally define a mono- or polycyclic, aliphatic or aromatic ring system.