| abstract |
A copolymer for use in an electroluminescent device comprising a first repeat unit, a second repeat unit comprising a group having a general formula (I) and optionally, a third repeat unit comprising a group having a general formula (II) which may be substituted or unsubstituted where T is a trifluoromethyl substituted benzene; Ar, Ar' and Ar'' each independently comprise a substituted or unsubstituted aryl or heteroaryl group and m is 1 or 2. |