| CPC H10K 85/654 (2023.02) [H10K 85/626 (2023.02); H10K 85/636 (2023.02); H10K 85/6572 (2023.02); H10K 85/6574 (2023.02); H10K 85/6576 (2023.02); H10K 50/11 (2023.02); H10K 2101/10 (2023.02); H10K 2101/90 (2023.02)] | 9 Claims |

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1. A compound of Formula 1-A′:
![]() wherein:
X1 is O or S,
Ar1 and Ar2 are each independently a C6-C60 aryl group,
L1 and L2 are each independently a single bond or a C6-C60 arylene group,
L3 is a single bond,
R1 is hydrogen or deuterium,
a is an integer of 0-9,
Ar1, Ar2, L1 and L2 may be each optionally substituted with deuterium or a C6-C20 aryl group substituted with deuterium, and
at least one of Ar1Ar2, L1 and L2 is substituted with deuterium.
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