Compositions comprising oxygen substituted benzocyclobutenes and dienophiles, and electronic devices containing the same

A light emitting device comprising a polymeric charge transfer layer, wherein the polymeric charge transfer layer is formed from a composition comprising a polymer,

• said polymer comprising one or more polymerized units derived from Structure A, and one or more polymerized units derived from Structure B, each as follows:
• A) a monomer having the Structure A:
• wherein, for Structure A, A is a substituted or unsubstituted aromatic moiety or a substituted or unsubstituted heteroaromatic moiety;
• and
• wherein R1 through R3 are each independently selected from the following:
• hydrogen, deuterium, a hydrocarbyl, a substituted hydrocarbyl, a heterohydrocarbyl, a substituted heterohydrocarbyl, a halogen, a cyano, an aryl, a substituted aryl, a heteroaryl, a substituted heteroaryl;
• and
• wherein n is from 1 to 10;
• and each R4 s independently selected from the following:
• hydrogen, deuterium, a hydrocarbyl, a substituted hydrocarbyl, a heterohydrocarbyl, a substituted heterohydrocarbyl, a halogen, a cyano, an aryl, a substituted aryl, a heteroaryl, a substituted heteroaryl;
• and wherein each R4 group is independently bonded to A;
• and
• wherein O is oxygen;
• and
• wherein Q is selected from the following:
• hydrogen, deuterium, a hydrocarbyl, a substituted hydrocarbyl, a heterohydrocarbyl, a substituted heterohydrocarbyl, a halogen, a cyano, an aryl, an substituted aryl, a heteroaryl, a substituted heteroaryl;
• and
• wherein two or more of R1through R4may optionally form one or more ring structures;
• and
• B) a monomer of Structure B comprising one or more dienophile moieties and selected from