A diamine compound represented by the following formula 1: In the formula 1, L is a linker selected from Ar 1 and Ar 2 are each independently a divalent organic group selected from and R 1 to R 11 are each independently hydrogen, deuterium, a halogen atom, a cyano group, a hydroxy group, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted haloalkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted alkylsilyl group having 1 to 30 carbon atoms, a substituted or unsubstituted arylsilyl group having 6 to 30 carbon atoms, a substituted or unsubstituted alkylamino group having 1 to 30 carbon atoms, a substituted or unsubstituted arylamino group having 6 to 30 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms, a substituted or unsubstituted alkylthio group having 1 to 30 carbon atoms, a substituted or unsubstituted arylthiol group having 6 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted aralkyl group having 6 to 30 carbon atoms, a substituted or unsubstituted aryloxy group having 6 to 30 carbon atoms, a -COOH group, a substituted or unsubstituted cycloalkyl group having 3 to 30 carbon atoms, an amide group, a substituted or unsubstituted cycloalkyloxy group having 3 to 30 carbon atoms, a substituted or unsubstituted cycloalkylthio group having 1 to 30 carbon atoms, an ester group, -CD 3, an azide group, a nitro group, or a substituted or unsubstituted (3-30 membered) heteroaryl group comprising at least one selected from B, N, O, S, P (= O), Si and P, Y is selected from I, m, n, o, p, q, r, s, t, u and v are each an integer of 0 to 4, and when I, m, n, o, p, q, r, s, t, u and v are integers of 2 to 4, each of R 1 to R 11 is the same or different. L is a linker selected from Ar 1 and Ar 2 are each independently a divalent organic group selected from and R 1 to R 11 are each independently hydrogen, deuterium, a halogen atom, a cyano group, a hydroxy group, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted haloalkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted alkylsilyl group having 1 to 30 carbon atoms, a substituted or unsubstituted arylsilyl group having 6 to 30 carbon atoms, a substituted or unsubstituted alkylamino group having 1 to 30 carbon atoms, a substituted or unsubstituted arylamino group having 6 to 30 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms, a substituted or unsubstituted alkylthio group having 1 to 30 carbon atoms, a substituted or unsubstituted arylthiol group having 6 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted aralkyl group having 6 to 30 carbon atoms, a substituted or unsubstituted aryloxy group having 6 to 30 carbon atoms, a -COOH group, a substituted or unsubstituted cycloalkyl group having 3 to 30 carbon atoms, an amide group, a substituted or unsubstituted cycloalkyloxy group having 3 to 30 carbon atoms, a substituted or unsubstituted cycloalkylthio group having 1 to 30 carbon atoms, an ester group, -CD 3, an azide group, a nitro group, or a substituted or unsubstituted (3-30 membered) heteroaryl group comprising at least one selected from B, N, O, S, P (= O), Si and P, Y is selected from I, m, n, o, p, q, r, s, t, u and v are each an integer of 0 to 4, and when I, m, n, o, p, q, r, s, t, u and v are integers of 2 to 4, each of R 1 to R 11 is the same or different.