Organic tadf molecules having steric hindrance at the donor and at the acceptor for optoelectronic devices.
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The invention relates to novel organic emitter molecules of formula I and to the use thereof in optoelectronic components, especially in organic light-emitting diodes (OLEDs), with donor D: an aromatic or heteroaromatic chemical group with the HOMO localized thereon; acceptor A: an aromatic or heteroaromatic chemical group with the LUMO localized thereon; Z1, Z2: substituents for geometric fixing of the donor D relative to the acceptor A; where – donor D and acceptor A are bonded to one another by a single bond and – the energy differential ΔE(S1-T1) between the lowermost excited singlet state (S1) and the triplet state (T1) beneath for the organic molecule is less than 2000 cm-1 and wherein the at least two substituents Z1, Z2 are each independently selected from the group consisting of alkyl -CnH2n+1 with 1 ≤ n ≤ 8, cycloalkyl -CnH2n-1 with 3 ≤ n ≤ 6, alkoxy - OCnH2n+1 with 1 ≤ n ≤ 8, thioalkoxy -SCnH2n+1 with 1 ≤ n ≤ 8, alkylated amine -N(CnH2n+1)(Cn'H2n'+1) with n and n' = 1 to 8 or -N(Cn''H2n''-1)(Cn'''H2n'''-1) with n'' and n''' = 3, 4, 5 or 6 and substituted alkyl, substituted cycloalkyl, substituted alkoxy, substituted thioalkoxy and substituted aliphatic amine.