Crosslinked polymer blends that include a luminescent polymer, and devices incorporating same

A composition comprising a polymer blend including a luminescent polymer and a second polymer, wherein at least one polymer is crosslinked and the crosslinked polymer comprises units having the formula

• wherein:
• Q1 comprises at least one aryl or heteroaryl group;
• Q2 comprises at least one aryl or heteroaryl group;
• X1 is O bonded directly to an aryl carbon of Q1;
• X2 is O bonded directly to an aryl carbon of Q2;
• Z is a linker comprising at least one —(C(R2)2)—group;
• Y is a single bond or a linker group;
• R1 is independently at each occurrence H, a halogen, an alkyl group, a heteroalkyl group, an aryl group, or a heteroaryl group;
• R2 is independently at each occurrence H, an alkyl group, or a heteroalkyl group;
• and
• R7 comprises a crosslinked group.