Quantum dot light emitting device including ligand-substituted quantum dot light emitting layer with polymer having amine groups and method for fabricating the same

A method for fabricating a quantum dot light emitting device, comprising (a) forming an electron transport layer on a substrate, (b) coating a polymer having amine groups on the electron transport layer to form a polymer layer, and (c) coating quantum dots on the polymer layer to form a quantum dot light emitting layer,

• wherein the quantum dots have surface oleic acid ligands,
• wherein at least part of the quantum dot surface oleic acid ligands in contact with the polymer layer having the amine groups in step (c) are ligand-substituted with said amine groups,
• wherein said polymer is a dendrimer,
• wherein said dendrimer is a generation 3 or 4 dendrimer,
• wherein said amine groups are positioned at branch terminus of the dendrimer,
• and
• wherein the quantum dots are bonded to said amine groups of the dendrimer by ligand substitution.