Composition and organic optoelectronic device and display device

A composition, comprising:

• a first compound represented by Chemical Formula 1, and
• a second compound represented by Chemical Formula 2 or Chemical Formula 3:
• wherein, in Chemical Formula 1,
• Z1 to Z3 are independently N or CRa, in which Ra is hydrogen, deuterium, a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C6 to C30 aryl group, a substituted or unsubstituted C3 to C30 heterocyclic group, a substituted or unsubstituted silyl group, a substituted or unsubstituted amine group, a halogen, a cyano group, or a combination thereof,
• at least two of Z1 to Z3 are N,
• L1 to L3 are independently a single bond, a substituted or unsubstituted C6 to C20 arylene group, a substituted or unsubstituted divalent C3 to C20 heterocyclic group, or a combination thereof,
• Ar1 to Ar3 are independently a substituted or unsubstituted C6 to C30 aryl group, a substituted or unsubstituted C3 to C30 heterocyclic group, or a combination thereof, and
• at least one of Ar1 to Ar3 is a group represented by Chemical Formula A,
• wherein, in Chemical Formula A,
• X is O or S,
• R1 to R4 are independently hydrogen, deuterium, a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C6 to C30 aryl group, a substituted or unsubstituted C3 to C30 heterocyclic group, a substituted or unsubstituted silyl group, a substituted or unsubstituted amine group, a halogen, a cyano group, or a combination thereof,
• R1 and R2 are separate or are linked with each other to form a ring,
• R3 and R4 are separate or are linked with each other to form a ring, and
• * is a linking point with Chemical Formula 1,
• wherein, in Chemical Formula 2 and Chemical Formula 3,
• Ar4 to Ar6 are independently hydrogen, deuterium, a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C6 to C30 aryl group, a substituted or unsubstituted C3 to C30 heterocyclic group, or a combination thereof,
• L4 to L6 are independently a single bond, a substituted or unsubstituted C6 to C20 arylene group, a substituted or unsubstituted divalent C3 to C20 heterocyclic group, or a combination thereof,
• R5 to R10 are independently hydrogen, deuterium, a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C6 to C30 aryl group, a substituted or unsubstituted C3 to C30 heterocyclic group, a substituted or unsubstituted silyl group, a substituted or unsubstituted amine group, a halogen, a cyano group, or a combination thereof,
• R5 and R6 are separate or are linked with each other to form a ring,
• R7 and R8 are separate or are linked with each other to form a ring, and
• R9 and R10 are separate or are linked with each other to form a ring.