Electron-transporting polymers

1. A polymer comprising structural units of formula I:

wherein

R 1 and R 2 are independently at each occurrence, hydrogen, a C 1 -C 20 aliphatic radical, a C 3 -C 20 aromatic radical, or a C 3 -C 20 cycloaliphatic radical;

R 3 is H or alkyl;

a and b are, independently at each occurrence 0, or an integer ranging from 1 to 3; and

Ar is a direct bond or aryl.

2. The polymer of claim 1 , being of formula

3. The polymer of claim 1 , being of formula

4. The polymer of claim 1 , being of formula

5. The polymer of claim 1 , additionally comprising structural units comprising at least one light emitting group that exhibits photoluminescence in the visible wavelength region of 400-700 nm.

6. The polymer of claim 5 , wherein the at least one light emitting group comprises a vinyl-functional phosphorescent moiety.

7. The polymer of claim 5 , wherein the at least one light emitting group comprises a vinyl-functional fluorescent moiety.

8. An optical electronic device comprising a polymer comprising structural units of formula I

wherein

R 1 and R 2 are independently at each occurrence, hydrogen, a C 1 -C 20 aliphatic radical, a C 3 -C 20 aromatic radical, or a C 3 -C 20 cycloaliphatic radical;

R 3 is H or alkyl;

a and b are, independently at each occurrence 0, or an integer ranging from 1 to 3; and

Ar is a direct bond or aryl.

9. The optoelectronic device of claim 8 , comprising one or more fluorescent emissive materials.

10. The optoelectronic device of claim 8 , comprising one or more phosphorescent emissive materials.

11. The optoelectronic device of claim 8 , comprising one or more, any or a combination of blue, yellow, orange, green and red phosphorenscent dyes.

12. The optoelectronic device of claim 8 , wherein the polymer is of formula

13. The optoelectronic device of claim 8 , wherein the polymer is of formula

14. The optoelectronic device of claim 8 , wherein the polymer is of formula