| abstract |
Polymers comprising repeating units of formula I: [Formula I] In the above formula, R 1 is independently H or a substituent at each occurrence, and two groups R 1 may be linked to form a ring; R 2 is independently a substituent at each occurrence; Ar 1 is at each occurrence independently an aryl or heteroaryl group which may be unsubstituted or substituted by one or more substituents; R 3 is independently a substituent at each occurrence; Each n is independently 0, 1, 2 or 3, with at least one n being 1; Each m is independently 0 or 1. The polymer may be the emission layer 103 of an organic light emitting device. |