Polymer compound, composition including the polymer compound, light-emitting device including the polymer compound

A polymer compound consisting of a first repeating unit represented by one of Formulae

• 1-1-a to 1-1-r, 1-2-a to 1-2-l, 1-3-a to 1-3-l, and 1-4-a to 1-4-l a third repeating unit represented by Formulae 4-1 or 4-2, and optionally a second repeating unit represented by Formula 2, wherein the first repeating units may be the same or different, the third repeating units may be the same or different, and the second repeating units may be the same of different:
• wherein, in Formulae
• 1-1-a to 1-1-r, 1-2-a to 1-2-l, 1-3-a to 1-2-l, and 1-4-a to 1-4-l;
• each instance of alkyl is independently unsubstituted or substituted with deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group, or a C1-C60 alkyl group, and
• * and *′ each indicate a binding site to a neighboring atom,
• wherein, in Formulae 4-1 and 4-2,
• R41 and R42 are each independently hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group, or a C1-C60 alkyl group, and
• * and *′ each indicate a binding site to Formula 1, Formula 2, Formula 4-1, Formula 4-2, or a combination thereof,
• wherein, in Formula 2,
• Ar3 is a substituted or unsubstituted C5-C30 carbocyclic group or a substituted or unsubstituted C1-C30 heterocyclic group,
• L5 is selected from a single bond, a substituted or unsubstituted C1-C60 alkylene group, a substituted or unsubstituted C3-C10 cycloalkylene group, a substituted or unsubstituted C1-C10 heterocycloalkylene group, a substituted or unsubstituted C3-C10 cycloalkenylene group, a substituted or unsubstituted C1-C10 heterocycloalkenylene group, a substituted or unsubstituted C6-C60 arylene group, a substituted or unsubstituted C1-C60 heteroarylene group, a substituted or unsubstituted divalent non-aromatic condensed polycyclic group, and a substituted or unsubstituted divalent non-aromatic condensed heteropolycyclic group,
• m5 is an integer from 0 to 5,
• when m5 is zero, L5 is a single bond,
• when m5 is two or more, two or more groups L5 are identical to or different from each other,
• Q1 is a monovalent crosslinking group comprising at least one selected from an ether group, a vinyl group, an acrylate group, a methacrylate group, a styryl group, an epoxy group, an oxetane group, and a benzocyclobutene group,
• n1 is an integer from 1 to 5, wherein, when n1 is two or more, two or more groups Q1 are identical to or different from each other, and
• p1 is an integer from 1 to 5, wherein, when p1 is two or more, two or more groups -(L5)m5-(Q1)n1 are identical to or different from each other.