Composition for organic optoelectronic device, organic optoelectronic device and display device

A composition for an organic optoelectronic device, the composition comprising:

• a first compound represented by Chemical Formula 1, and
• a second compound represented by a combination of Chemical Formula 2 and Chemical Formula 3,
• wherein, in Chemical Formula 1,
• R1 to R12 are each independently hydrogen, deuterium, a cyano group, a halogen, a substituted or unsubstituted C1 to C30 alkyl group, or a substituted or unsubstituted C6 to C30 aryl group,
• L1 is a single bond or a substituted or unsubstituted C6 to C30 arylene group, and
• ET is a substituted or unsubstituted pyridinyl group, a substituted or unsubstituted pyrimidinyl group, a substituted or unsubstituted triazinyl group, a substituted or unsubstituted quinolinyl group, a substituted or unsubstituted isoquinolinyl group, a substituted or unsubstituted quinazolinyl group, a substituted or unsubstituted quinoxalinyl group, a substituted or unsubstituted naphthyridinyl group, a substituted or unsubstituted benzofuranpyrimidinyl group, or a substituted or unsubstituted benzothiophenepyrimidinyl group;
• wherein, in Chemical Formula 2 and Chemical Formula 3,
• Ar is a substituted or unsubstituted C6 to C30 aryl group or a substituted or unsubstituted C2 to C30 heterocyclic group,
• two adjacent ones of a1* to a4* of Chemical Formula 2 are linking carbons linked at * of Chemical Formula 3, the remaining two of a1* to a4* of Chemical Formula 2, not linked at * of Chemical Formula 3, are CRa,
• Ra and R13 to R20 are each independently hydrogen, deuterium, a cyano group, a substituted or unsubstituted amine group, a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C6 to C30 aryl group, or a substituted or unsubstituted C2 to C30 heterocyclic group, and
• at least one of R17 to R20 is a group represented by Chemical Formula a,
• wherein, in Chemical Formula a,
• La, Lb, and Lc are each independently a single bond, a substituted or unsubstituted C6 to C20 arylene group, or a substituted or unsubstituted C2 to C20 heterocyclic group,
• Rb and Rc are each independently a substituted or unsubstituted C6 to C30 aryl group or a substituted or unsubstituted C2 to C30 heterocyclic group, and
• * is a linking point.