abstract |
A copolymer has a polystyrene reduced number average molecular weight of 10 3 -10 8 , and includes repeating units represented by formulas (1), (2), and (3), n n n —Ar 1 — (3)n nThe copolymer has an excellent solubility in an organic solvent, and a high glass transition temperature in good valance. Further, a polymer LED has high performance, such as low-voltage driving and high luminance. |