| CPC C07D 405/14 (2013.01) [C07D 491/048 (2013.01); C09K 11/06 (2013.01); H10K 85/654 (2023.02); H10K 85/657 (2023.02); H10K 85/6572 (2023.02); H10K 85/6574 (2023.02); C09K 2211/1018 (2013.01); H10K 50/11 (2023.02); H10K 50/15 (2023.02); H10K 50/16 (2023.02); H10K 50/17 (2023.02); H10K 50/171 (2023.02); H10K 50/18 (2023.02); H10K 85/324 (2023.02); H10K 85/342 (2023.02); H10K 2101/10 (2023.02)] | 6 Claims |

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1. A condensed-cyclic compound represented by Formula 1B-3:
![]() X1 is N,
X2 is N,
X3 is N,
X4 is O or S,
L21 is selected from
a phenylene group; and
a phenylene group, substituted with at least one deuterium,
a21 is 1,
a4 and a11 are each 0,
R5, R6, R15 and R17 are each independently selected from
a hydrogen, and a deuterium,
R4 is selected from
a phenyl group; and
a phenyl group, substituted with at least one deuterium,
R11 is selected from
a phenyl group; and
a phenyl group, substituted with at least one deuterium, or a phenyl group, b4 to b6, b11, b15 and b17 are each independently selected from integers of 1 to 3.
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