Compound for organic optoelectric device, composition for organic optoelectric device and organic optoelectric device and display device

A composition for an organic optoelectric device, comprising

• a first compound for an organic optoelectric device represented by Chemical Formula 1A;
• and
• a second compound for an organic optoelectric device represented by Chemical Formula 1B:
• wherein, in Chemical Formula 1A and Chemical Formula 1B,
• X is O, or S,
• 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, a substituted or unsubstituted benzothiophenepyrimidinyl group, or a substituted or unsubstituted phenanthrolinyl group,
• HT is a substituted or unsubstituted phenyl group, a substituted or unsubstituted biphenyl group, a substituted or unsubstituted terphenyl group, a substituted or unsubstituted naphthyl group, a substituted or unsubstituted phenanthrenyl group, a substituted or unsubstituted triphenylene group, a substituted or unsubstituted fluorenyl group, a substituted or unsubstituted fluoranthenyl group, a substituted or unsubstituted carbazolyl group, a substituted or unsubstituted dibenzofuranyl group, or a substituted or unsubstituted dibenzothiophenyl group,
• R2 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
• L is 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.