Polymer for optoelectronic device

1. A polymer comprising structural unit of formula I:

wherein

R 1 is, independently at each occurrence, a C 1 -C 20 aliphatic radical, a C 3 -C 20 aromatic radical, or a C 3 -C 20 cycloaliphatic radical;

a is, independently at each occurrence, an integer ranging from 0-4;

Ar 1 is aryl or heteroaryl;

Ar 2 is fluorene;

R 2 is alkylene, substituted alkylene, oxaalkylene, CO, or CO 2 ;

R 3 , R 4 and R 5 are independently hydrogen, alkyl, alkoxy, alkylaryl, aryl, arylalkyl, heteroaryl, substituted alkyl; substituted alkoxy, substituted alkylaryl, substituted aryl, substituted arylalkyl, or substituted heteroaryl; and

L is derived from phenylpyridine, tolylpyridine, benzothienylpyridine, phenylisoquinoline, dibenzoquinozaline, fluorenylpyridine, ketopyrrole, 2-(1-naphthyl)benzoxazole)), 2-phenylbenzoxazole, 2 phenylbenzothiazole, coumarin, thienylpyridine, phenylpyridine, benzothienylpyridine, 3 methoxy-2-phenylpyridine, thienylpyridine, phenylimine, vinylpyridine, pyridylnaphthalene, pyridylpyrrole, pyridylimidazole, phenylindole, or combinations thereof.

2. The polymer of claim 1 , wherein Ar 1 is selected from

3. The polymer of claim 1 , wherein Ar 2 derives from a dibromo 9,9-dioctyl fluorene monomer.

4. The polymer of claim 1 , wherein L is derived from phenylisoquinoline.

5. The polymer of claim 1 , comprising structural unit of formula II

wherein

R 6 and R 7 are, independently at each occurrence, a C 1 -C 20 aliphatic radical, a C 3 -C 20 aromatic radical, or a C 3 -C 20 cycloaliphatic radical;

b, independently at each occurrence, an integer ranging from 0-3; and

c, independently at each occurrence, an integer ranging from 0-2.

6. The polymer of claim 1 , comprising structural unit of formula III

7. The polymer of claim 1 , comprising structural unit of formula IV

wherein x+y=100.

8. The polymer of claim 1 , comprising structural unit derived from

9. An optoelectronic device comprising a polymer of claim 1 .

10. The optoelectronic device of claim 9 , wherein the polymer comprises structural unit of formula II

wherein

R 6 and R 7 are, independently at each occurrence, a C 1 -C 20 aliphatic radical, a C 3 -C 20 aromatic radical, or a C 3 -C 20 cycloaliphatic radical;

b, independently at each occurrence, an integer ranging from 0-3; and

c, independently at each occurrence, an integer ranging from 0-2.

11. The optoelectronic device of claim 9 , wherein the polymer comprises structural unit of formula III

12. The optoelectronic device of claim 9 , wherein the polymer comprises structural unit of formula IV

wherein x+y=100.

13. The optoelectronic device of claim 9 , wherein the polymer comprises structural unit derived from

14. The optoelectronic device of claim 9 , wherein the polymer comprises structural unit derived from

15. The optoelectronic device of claim 9 , wherein the polymer comprises structural unit derived from

16. The optoelectronic device of claim 9 , wherein the polymer comprises structural unit derived from

17. The optoelectronic device of claim 9 , wherein Ar 1 is selected from

18. The optoelectronic device of claim 9 , wherein Ar 2 derives from a dibromo 9,9-dioctyl fluorene monomer.

19. The optoelectronic device of claim 9 , wherein L is derived from phenylisoquinoline.

20. The optoelectronic device of claim 9 , comprising more than one light emissive layers and wherein at least one of the more than one light emissive layers comprises the polymer.