In one or more embodiments, the third compound may be a compound represented by one of Formulae 4-1 to 4-3:
In Formulae 4-1 and 4-2, X91 may be O, S, or Se.
In Formulae 4-1 and 4-3, Ar91 and Ar92 may each independently be a substituted or unsubstituted benzene group and a substituted or unsubstituted naphthalene group.
In Formulae 4-1 and 4-3, c91 and c92 indicate the number of Ar91 and the number of Ar92, respectively, and may each independently be an integer from 1 to 5.
In Formulae 4-1 and 4-3, n91 indicates the number of a group represented by *-(L92)a92—(Ar92)c92, and may be an integer from 0 to 5.
In Formula 4-2, TPh may be a group represented by Formula 4B.
In Formula 4-2, m91 and m92 each indicate the number of TPh, and may each independently be an integer from 0 to 2, wherein the sum of m91 and m92 may be 1 or more.
In Formulae 4-1 to 4-3, L91 to L94, a91 to a94, R91 to R99, Z91 to Z93, b91 to b99, and d91 to d93 may each be the same as described in the present specification.
In an embodiment, in Formulae 4-1 and 4-3, a group represented by *-(L91)a91-(Ar91)c91 and a group represented by *-(L92)a92-(Ar92)c92 may each independently be a group represented by one of Formulae 4-11 to 4-15: