Organic molecules for OLEDs and other optoelectronic devices

A composition comprising:

• an organic emitter molecule for emission of light, comprising a ΔE(S1−T1) value between a lowest excited singlet state (S1) and a triplet state (T1) below the lowest excited singlet state of less than 3000 cm−1;
• and
• an optically inert atom or a molecule;
• wherein the optically inert atom or molecule interacts with the organic emitter molecule to reduce an intersystem crossing time constant of the organic emitter molecule to less than 300 ms,
• wherein the organic emitter molecule is a molecule of formula V:
• wherein
• at least one of D1 to D8 is hydrogen or represents a donor group, each independently selected from the group consisting of:
• —O(—), —NH-alkyl group, —N-(alkyl group)2, —NH2, —OH, —O-alkyl group, —NH(CO)alkyl group, —O(CO), -alkyl group, -aryl group, -heterocyclic groups —(CH)═C-(alkyl group)2, -phenoxazinyl, -phenothiazinyl, -carbazolyl, -dihydrophenazinyl, —N(R′)(R″) wherein R′ and R″ are H, alkyl, aryl, halogenated alkyl, halogenated aryl), wherein all aryl and heterocyclic groups can be substituted with alkyl and/or aryl groups, and all alkyl groups can also be substituted with F, Cl, Br and/or I;
• wherein adjacent Di, Dj, and Dk from D1 to D8 optionally are conjugated aromatic or heteroaromatic rings, which may have a donor function, wherein i, j and k are each an integer from 1 to 8 and different from each other;
• at least one of A1 to A8 is hydrogen or represents an acceptor group, each independently selected the group consisting of -halogen, —(CO)H, —(CO)-alkyl group, —(CO)O-alkyl group, —(CO)OH, —(CO)Cl, —CF3, —BF2, —CN, —S(O)2OH, —S(O)2O-alkyl, —NH3+, —N(alkyl group)3+, —NO2, halogenated alkyl, and —B(R′)(R″) wherein R′ and R″ are H, alkyl, aryl, halogenated alkyl, halogenated aryl;
• wherein adjacent Ai, Aj, and Ak from A1 to A8 optionally are conjugated aromatic or heteroaromatic rings, which may have an acceptor function, wherein i, j and k are each an integer from 1 to 8 and different from each other;
• at least one donor group and at least one acceptor group are present;
• wherein the optically inert atom or molecule is selected from the group consisting of krypton, xenon, bromine-comprising substances, iodine-comprising substances, metal atoms, metal nanoparticles, metal ions, gadolinium-complexes and lead complexes, and
• further wherein the organic emitter molecule is embedded into a matrix or cross-linked with a matrix and wherein the matrix comprises at least one covalently bonded additive selected from a bromine atom or an iodine atom.