Organic molecules for optoelectronic devices

An optoelectronic device comprising a light-emitting layer which comprises an organic molecule, the organic molecule comprising a structure of formula I:

• wherein
• T and V is independently from another selected from the group consisting of R1 and R2;
• R1 is at each occurrence comprising or consisting of a structure of formula II:
• which is bonded via the position marked by the dotted line;
• Ar1 is C6-Coo-aryl, which is optionally substituted with one or more substituents R6:
• R2 is selected from the group consisting of:
• Me, iPr, iBu, SiMe3, SiPh3, and
• Ph, which is optionally substituted with one or more substituents independently from each other selected from the group consisting of Me, iPr, iBu, and Ph;
• R6 is at each occurrence independently from another selected from the group consisting of hydrogen, deuterium, OPh, SPh, CF3, CN, F, Si(C1-C5-alkyl)3, Si(Ph)3,
• C1-C5-alkyl,
• wherein optionally one or more hydrogen atoms are independently from each other substituted by deuterium, CN, CF3, or F;
• C1-C5-alkoxy,
• wherein optionally one or more hydrogen atoms are independently from each other substituted by deuterium, CN, CF3, or F;
• C1-C5-thioalkoxy,
• wherein optionally one or more hydrogen atoms are independently from each other substituted by deuterium, CN, CF3, or F;
• C2-C5-alkenyl,
• wherein optionally one or more hydrogen atoms are independently from each other substituted by deuterium, CN, CF3, or F:
• C2-C5-alkynyl,
• wherein optionally one or more hydrogen atoms are independently from each other substituted by deuterium, CN, CF3, or F:
• C6-C18-aryl,
• which is optionally substituted with one or more C1-C5-alkyl substituents;
• C3-C17-heteroaryl,
• which is optionally substituted with one or more C1-C5-alkyl substituents:
• N(C6-C18-aryl)2,
• N(C3-C17-heteroaryl)2, and
• N(C3-C17-heteroaryl) (C6-C18-aryl);
• wherein exactly one moiety selected from the group consisting of T and V is R1 and exactly one moiety selected from the consisting of T and V is R2, and
• wherein the light-emitting layer comprises the organic molecule and a host,
• a first excited triplet state of the host is energetically higher than a first excited triplet state of the organic molecule,
• a first excited singlet state of the host is energetically higher than a first excited singlet state of the organic molecule, and
• the organic molecule is configured to receive energy from the host and emit light having an emission maxima of 380 nm to 470 nm.

A composition comprising:

• (a) at least one organic molecule comprising a structure of formula I as an emitter:
• wherein
• T and V is independently from another selected from the group consisting of R1 and R2;
• R1 is at each occurrence comprising or consisting of a structure of formula II:
• which is bonded via the position marked by the dotted line;
• Ar1 is C6-C60-aryl, which is optionally substituted with one or more substituents R6;
• R2 is at each occurrence independently from another selected from the group consisting of OPh, SPh, CF3, CN, F, Si(C1-C5-alkyl)3, Si(Ph)3,
• C1-C5-alkyl,
• wherein optionally one or more hydrogen atoms are independently from each other substituted by deuterium, CN, CF3, or F;
• C1-C5-alkoxy,
• wherein optionally one or more hydrogen atoms are independently from each other substituted by deuterium, CN, CF3, or F;
• C1-C5-thioalkoxy,
• wherein optionally one or more hydrogen atoms are independently from each other substituted by deuterium, CN, CF3, or F;
• C2-C5-alkenyl,
• wherein optionally one or more hydrogen atoms are independently from each other substituted by deuterium, CN, CF3, or F;
• C2-C5-alkynyl,
• wherein optionally one or more hydrogen atoms are independently from each other substituted by deuterium, CN, CF3, or F;
• C6-C18-aryl,
• which is optionally substituted with one or more C1-C5-alkyl substituents;
• C3-C17-heteroaryl,
• which is optionally substituted with one or more C1-C5-alkyl substituents;
• N(C6-C18-aryl)2,
• N(C3-C17-heteroaryl)2, and
• N(C3-C17-heteroaryl) (C6-C18-aryl);
• and
• R6 is at each occurrence independently from another selected from the group consisting of hydrogen, deuterium, OPh, SPh, CF3, CN, F, Si(C1-C5-alkyl)3, Si(Ph)3,
• C1-C5-alkyl,
• wherein optionally one or more hydrogen atoms are independently from each other substituted by deuterium, CN, CF3, or F;
• C1-C5-alkoxy,
• wherein optionally one or more hydrogen atoms are independently from each other substituted by deuterium, CN, CF3, or F;
• C1-C5-thioalkoxy,
• wherein optionally one or more hydrogen atoms are independently from each other substituted by deuterium, CN, CF3, or F;
• C2-C5-alkenyl,
• wherein optionally one or more hydrogen atoms are independently from each other substituted by deuterium, CN, CF3, or F;
• C2-C5-alkynyl,
• wherein optionally one or more hydrogen atoms are independently from each other substituted by deuterium, CN, CF3, or F;
• C6-C18-aryl,
• which is optionally substituted with one or more C1-C5-alkyl substituents;
• C3-C17-heteroaryl,
• which is optionally substituted with one or more C1-C5-alkyl substituents;
• N(C6-C18-aryl)2,
• N(C3-C17-heteroaryl)2, and
• N(C3-C17-heteroaryl) (C6-C18-aryl);
• wherein exactly one moiety selected from the group consisting of T and V is R1 and exactly one moiety selected from the group consisting of T and V is R2
• (b) one or more host materials different from the at least one organic molecule, wherein a first excited triplet state of the one or more host materials is energetically higher than a first excited triplet state of the organic molecule, and a first excited singlet state of the one or more host materials is energetically higher than a first excited singlet state of the organic molecule, and
• (c) optionally one or more dyes and/or one or more solvents, and
• wherein the organic molecule is configured to receive energy from the one or more host materials and emit light having an emission maxima of 380 nm to 470 nm.