| CPC H10K 85/654 (2023.02) [C07D 209/86 (2013.01); C07D 405/14 (2013.01); C07D 407/04 (2013.01); C07D 407/10 (2013.01); C07D 409/04 (2013.01); C07D 409/10 (2013.01); C09K 11/025 (2013.01); H10K 50/00 (2023.02); H10K 85/653 (2023.02); H10K 99/00 (2023.02); C09K 11/06 (2013.01); H10K 50/11 (2023.02); H10K 2101/10 (2023.02)] | 12 Claims |

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1. A composition for an organic optoelectronic device, the composition comprising
a first host compound represented by Chemical Formula 1; and
a second host compound represented by Chemical Formula 2:
![]() wherein, in Chemical Formula 1,
X is O or S,
L1 is a single bond,
L2 and L3 are each independently a single bond, a para-phenylene group, or a biphenylene group,
X1 to X3 are independently N or CRa,
at least two of X1 to X3 are N,
R1 to R3 are independently hydrogen, deuterium, a substituted or unsubstituted C1 to C10 alkyl group, a substituted or unsubstituted C6 to C12 aryl group, or a combination thereof,
Ra is hydrogen, deuterium, a substituted or unsubstituted C6 to C30 aryl group, a substituted or unsubstituted dibenzofuranyl group, a substituted or unsubstituted dibenzothiophenyl group, or a combination thereof, and
Rb and Rc are independently a substituted or unsubstituted C6 to C30 aryl group, a substituted or unsubstituted dibenzofuranyl group, a substituted or unsubstituted dibenzothiophenyl group, or a combination thereof,
at least one of Rb and Rc is a substituted or unsubstituted dibenzofuranyl group, a substituted or unsubstituted dibenzothiophenyl group, or a combination thereof,
wherein “substituted” of Chemical Formula 1 refers to replacement of at least one hydrogen by deuterium, a C6 to C30 aryl group, a dibenzofuranyl group, or a dibenzothiophenyl group;
![]() wherein, in Chemical Formula 2,
Y1 and Y2 are independently a single bond, a substituted or unsubstituted C6 to C30 arylene group, a substituted or unsubstituted C2 to C30 heteroarylene group, or a combination thereof,
Z1 and Z2 are independently a substituted or unsubstituted C6 to C30 aryl group, a substituted or unsubstituted C2 to C30 heterocyclic group, or a combination thereof,
R4 to R9 are independently hydrogen, deuterium, a substituted or unsubstituted C1 to C20 alkyl group, a substituted or unsubstituted C6 to C30 aryl group, a substituted or unsubstituted C2 to C30 heterocyclic group, or a combination thereof, and
m is an integer of 0 to 2;
wherein “substituted” of Chemical Formula 2 refers to replacement of at least one hydrogen by deuterium, a C1 to C4 alkyl group, a C6 to C18 aryl group, or a C2 to C30 heteroaryl group.
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