Light-emitting element, method for manufacturing light-emitting element, and display device

A light-emitting element comprising:

• a first electrode and a second electrode;
• a light-emitting layer disposed between the first electrode and the second electrode;
• and a functional layer disposed between the light-emitting layer and the second electrode,
• wherein the light-emitting layer has a first quantum dot portion including a first quantum dot, and a second quantum dot portion disposed between the first quantum dot portion and the functional layer, and including a second quantum dot,
• one of the first quantum dot portion and the second quantum dot portion contains halogen elements at a predetermined concentration, and another of the first quantum dot portion and the second quantum dot portion contains no halogen elements or contains halogen elements at a lower concentration than the predetermined concentration
• the first quantum dot has a core and a shell, and
• the core of the first quantum dot contains halogen elements, and the shell of the first quantum dot contains no halogen elements.

A light-emitting element comprising:

• a first electrode and a second electrode;
• a light-emitting layer disposed between the first electrode and the second electrode;
• and a functional layer disposed between the light-emitting layer and the second electrode,
• wherein the light-emitting layer has a first quantum dot portion including a first quantum dot, and a second quantum dot portion disposed between the first quantum dot portion and the functional layer, and including a second quantum dot, and
• one selected from the first quantum dot and the second quantum dot has a portion located inside a surface of the selected quantum dot, and having a higher halogen element concentration than the surface
• the first quantum dot has a core and a shell, and
• the core and the shell of the first quantum dot each contain halogen elements.