a carbazolyl group substituted with at least one selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C1-C20 alkyl group, a C1-C10 alkoxy group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclopentenyl group, a cyclohexenyl group, a phenyl group, a biphenyl group, a terphenyl group, a phenyl group substituted with a C1-C10 alkyl group, a phenyl group substituted with —F, a naphthyl group, a fluorenyl group, a spiro-bifluorenyl group, a carbazolyl group, a dibenzofuranyl group, and a dibenzothiophenyl group.
The compound represented by Formula 201 may be represented by Formula 201A:
In an example embodiment, the compound represented by Formula 201 may be represented by Formula 201A(1):
In an example embodiment, the compound represented by Formula 201 may be represented by Formula 201A-1:
In an example embodiment, the compound represented by Formula 202 may be represented by Formula 202A: