Doped emissive layer for patterned QDS light emitting diodes (QLEDS) with balanced transport of charges

A light-emitting device, comprising:

• a substrate;
• an anode;
• a cathode;
• and
• an emissive layer between the anode and the cathode, the emissive layer comprising quantum dots having ligands, a cross-linked matrix comprising a cross-linkable charge transport material other than the ligands, and another charge transport material,
• wherein:
• the quantum dots are dispersed in the cross-linked matrix;
• the another charge transport material alters mobility of charge carriers of the emissive layer,
• the cross-linkable charge transport material is a cross-linkable electron transporting material,
• the another charge transport material is an inefficient electron transporting material that inhibits mobility of electrons more than the cross-linkable charge transport material, and
• in the emissive layer, the quantum dots and the another charge transport material are layer-separated from each other such that the quantum dots are close to the anode and the another charge transport material is close to the cathode.

A light emitting structure, comprising:

• a substrate;
• and
• a plurality of sub-pixel structures over the substrate,
• wherein at least one of the plurality of sub-pixel structures includes:
• an anode;
• a cathode;
• and
• an emissive layer between the anode and the cathode, the emissive layer comprising quantum dots having ligands, a cross-linked matrix comprising a cross-linkable charge transport material other than the ligands, and another charge transport material,
• wherein:
• the quantum dots are dispersed in the cross-linked matrix,
• the another charge transport material is not cross-linked with the cross-linkable charge transport material in the cross-linked matrix,
• the another charge transport material alters mobility of charge carriers of the emissive layer,
• the cross-linkable charge transport material is a cross-linkable hole transporting material,
• the another charge transport material is an efficient hole transporting material with enhanced or reduced hole transporting properties that improves hole mobility more than the cross-linkable charge transport material, and
• in the emissive layer, the quantum dots and the another charge transport material are layer-separated from each other such that the quantum dots are close to the cathode and the another charge transport material is close to the anode.