Patent ID: 7696284

Claim:
The white-emitting copolymer comprising at least three different repeating units, characterized in that the first repeating unit, unit B, is present in a proportion of at least 10 mol % and displays blue emission, the second repeating unit, unit G, is present in the polymer in a proportion of from 0.001 to 3 mol % and displays green emission and the third repeating unit, unit R, is present in a proportion of from 0.0005 to 1 mol % and displays red emission with the proviso that this unit B is not a carbazole when the polymer is a nonconjugated phosphorescent polymer; and with the exception of a polymer comprising the repeating units (a), (b) and (c), where the content of monomer (b) is in the range from 2.32 to 2.34 mol % and the content of monomer (c) is in the range from 0.174 to 0.176 mol %.