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

A composition for an organic optoelectronic device, comprising:

• at least one of a first host compound represented by one of Chemical Formula C, Chemical Formula E1, and Chemical Formula E2, and
• at least one of a second host compound represented by a combination of Chemical Formula 3 and Chemical Formula 4,
• wherein the first host compound and the second host compound are present in the composition in a weight ratio of first host compound:second host compound of about 6:4 to about 10:1,
• wherein, in Chemical Formula C,
• A is a substituted or unsubstituted carbazolyl group,
• Ar2 is a substituted or unsubstituted C6 to C20 aryl group, or a substituted or unsubstituted C2 to C20 heterocyclic group,
• L1 and L2 are independently a single bond or a substituted or unsubstituted C6 to C20 arylene group, and
• Ra1 to Ra2 and R1 to R4 are independently hydrogen, deuterium, a substituted or unsubstituted C1 to C10 alkyl group, a substituted or unsubstituted C6 to C20 aryl group, or a combination thereof;
• wherein, in Chemical Formula E1 and Chemical Formula E2,
• Ar1 and Ar2 are independently a substituted or unsubstituted C6 to C20 aryl group,
• L1 and L2 are independently a single bond, or a substituted or unsubstituted C6 to C20 arylene group, and
• R1 to R10 are independently hydrogen, deuterium, a substituted or unsubstituted C1 to C10 alkyl group, a substituted or unsubstituted C6 to C20 aryl group, or a combination thereof;
• wherein, in Chemical Formulae 3 and 4,
• two adjacent *'s of Chemical Formula 3 are bound to two adjacent *'s of Chemical Formula 4 and the remainder *'s of Chemical Formula 3 not being bound to *'s of Chemical Formula 4 are CRb,
• a substituted or unsubstituted C6 to C30 aryl group, or a substituted or unsubstituted C2 to C30 heterocyclic group, and
• L3 and L4 are independently a single bond or a substituted or unsubstituted C6 to C30 arylene group,
• Z1 to Z5 are independently N or CRc, provided that at least two of Z1 to Z5 are N,
• Rb, Rc, and R11 to R14 are independently hydrogen, deuterium, a substituted or unsubstituted C1 to C10 alkyl group, a substituted or unsubstituted C6 to C20 aryl group, a substituted or unsubstituted C2 to C30 heterocyclic group, or a combination thereof, and
• Rc's are independently present alone or adjacent groups thereof are linked with each other to form a substituted or unsubstituted aliphatic, aromatic, or heteroaromatic monocyclic or polycyclic ring;
• and
• the “substituted” refers to replacement of at least one hydrogen by deuterium, a C1 to C4 alkyl group, a C6 to C12 aryl group, or a C2 to C20 heterocyclic group.