Light emitting element, display device including the light emitting element, and method of manufacturing the light emitting element

A display device comprising:

• a display element layer disposed on a base layer, wherein
• the display element layer includes a first light emitting element, a second light emitting element, and a third light emitting element, each emitting light in a different wavelength region,
• the first, second, and third light-emitting elements each comprises:
• a first electrode;
• a second electrode disposed on the first electrode;
• an emission layer disposed between the first electrode and the second electrode;
• a hole transport region disposed between the first electrode and the second electrode;
• and
• an electron transport region disposed between the first electrode and the second electrode,
• the emission layer is disposed between the hole transport region and the electron transport region,
• at least one of the first to third light-emitting elements each includes a quantum dot in the emission layer,
• the remainder of the first to third light-emitting elements each includes an organic emission material in the emission layer,
• the light-emitting element including the quantum dot includes a metal nanoparticle in at least one of the hole transport region and the electron transport region,
• the metal nanoparticle comprises:
• a core including a metal oxide;
• and
• a ligand bonded to the core, the ligand including an acidic functional group, a basic functional group, or an ultraviolet-reactive functional group, and
• the ultraviolet-reactive functional group shrinks or expands when ultraviolet light is provided.

A method of manufacturing a light-emitting element, the method comprising:

• preparing a preliminary light-emitting element;
• and
• forming a light-emitting element by providing, to the preliminary light-emitting element, an acidic material, a basic material, or ultraviolet light, wherein
• the preparing of the preliminary light-emitting element comprises:
• forming a first electrode;
• forming an emission layer by providing a quantum dot on the first electrode;
• forming a second electrode on the emission layer;
• forming a hole transport region;
• and
• forming an electron transport region,
• one step among the forming of the hole transport region and the forming of the electron transport region is performed between the forming of the first electrode and the forming of the emission layer, and
• the remaining step among the forming of the hole transport region and the forming of the electron transport region is performed between the forming of the emission layer and the forming of the second electrode,
• at least one of the forming of the hole transport region and the forming of the electron transport region includes providing a composition that includes a preliminary metal nanoparticle,
• the preliminary metal nanoparticle comprises:
• a core including a metal oxide;
• and
• a preliminary ligand bonded to the core, the ligand including an acidic functional group, a basic functional group, or an ultraviolet-reactive functional group
• the ultraviolet-reactive functional group shrinks or expands when the ultraviolet light is provided.