Polymer and organic light emitting device comprising same

1 . An organic light emitting device comprising an anode; a cathode that is disposed opposite to the anode; a light emitting layer that is provided between the anode and the cathode; and a hole transport layer that is provided between the anode and the light emitting layer,

wherein the hole transport layer comprises a polymer comprising a repeating unit represented by Chemical Formula 1′ or 1″:

in Chemical Formula 1′ and 1″,

each L is independently a substituted or unsubstituted C 6-10 arylene,

each R 1 is independently a substituted or unsubstituted C 4-10 alkyl,

each R 2 is independently a substituted or unsubstituted C 1-4 alkyl,

each R 3 is independently a substituted or unsubstituted C 1-10 alkyl, and

* indicates the point of attachment within the polymer,

in Chemical Formula 1′,

each R 4 is independently a substituted or unsubstituted C 1-4 alkyl, and

in Chemical Formula 1″,

each R 5 is independently a substituted or unsubstituted C 1-4 alkyl.

2 . The organic light emitting device according to claim 1 , wherein

each L is independently phenylene, or biphenyl.

3 . The organic light emitting device according to claim 1 , wherein

each L is independently

4 . The organic light emitting device according to claim 1 , wherein

each R 1 is independently a straight-chain hexyl, a straight-chain heptyl, a straight-chain octyl, a straight-chain nonyl, or a straight-chain decyl.

5 . The organic light emitting device according to claim 1 , wherein

each R 2 is independently methyl, ethyl, or propyl.

6 . The organic light emitting device according to claim 1 , wherein

each R 3 is independently methyl, ethyl, or propyl.

7 . The organic light emitting device according to claim 1 , wherein

each R 4 is independently methyl, ethyl, or propyl.

8 . The organic light emitting device according to claim 1 , wherein:

the repeating unit is represented by one of the following formulas:

9 . The organic light emitting device according to claim 1 , wherein:

the polymer further comprises a repeating unit represented by the following Chemical Formula 2:

in Chemical Formula 2,

each L′ is independently a single bond; or a substituted or unsubstituted C 6-60 arylene,

Z is C, Si, N, Si (phenyl), or an n-valent substituted or unsubstituted C 6-60 aromatic ring,

n is 3 or 4, with the proviso that n is 4 if Z is C or Si and n is 3 if Z is N or Si (phenyl), and

* indicates the point of attachment within the polymer.

10 . The organic light emitting device according to claim 9 , wherein:

each L′ is independently a single bond, or phenylene.

11 . The organic light emitting device according to claim 9 , wherein:

Z is C, N, Si, or a trivalent benzene.

12 . The organic light emitting device according to claim 9 , wherein:

the Chemical Formula 2 is any one selected from the group consisting of:

13 . The organic light emitting device according to claim 1 , wherein:

the polymer further comprises a terminal group represented by the following Chemical Formula 3:

Ar   [Chemical Formula 3]

in Chemical Formula 3,

Ar is a substituted or unsubstituted C 6-60 aryl,

* indicates the point of attachment within the polymer.

14 . The organic light emitting device according to claim 13 , wherein:

Ar is phenyl, or biphenylyl, and

the Ar is unsubstituted or substituted with a C 1-10 alkyl, a photocurable group, or a thermosetting group.

15 . The organic light emitting device according to claim 13 , wherein:

the Chemical Formula 3 is any one selected from the group consisting of:

16 . The organic light emitting device according to claim 1 , wherein:

the polymer has a weight average molecular weight of 3,000 to 1,000,000 g/mol.

17 . The organic light emitting device according to claim 9 , wherein:

the repeating unit of Chemical Formula 2 is contained in an amount of 10 to 50 moles based on 100 moles of the repeating unit of Chemical Formula 1.

18 . The organic light emitting device according to claim 13 , wherein:

the repeating unit of Chemical Formula 3 is contained in an amount of 20 to 65 moles based on 100 moles of the repeating unit of Chemical Formula 1.