Light-emitting element and display device

A light-emitting element comprising:

• an anode;
• a cathode;
• and
• a light-emitting layer positioned between the anode and the cathode,
• wherein the light-emitting layer includes a plurality of quantum dots and an inorganic filler,
• the inorganic filler fills a space between the plurality of quantum dots and includes at least one of a metal sulfide and a metal oxide, and
• in the inorganic filler, there is a portion in which a concentration of at least one of sulfur atoms and oxygen atoms on a cathode side is lower than a concentration of the same atoms as the at least one of sulfur atoms and oxygen atoms on an anode side.

A light-emitting element comprising:

• an anode;
• a cathode;
• and
• a light-emitting layer positioned between the anode and the cathode,
• wherein the light-emitting layer includes
• a plurality of quantum dots and an inorganic filler that includes a chalcogenide and fills a space between the plurality of quantum dots, and
• in the inorganic filler, a concentration of atoms of a chalcogen element decreases in a direction from the anode toward the cathode.

A light-emitting element comprising:

• an anode;
• a cathode;
• and
• a light-emitting layer positioned between the anode and the cathode,
• wherein the light-emitting layer includes a plurality of quantum dots and an inorganic filler,
• the inorganic filler fills a space between the plurality of quantum dots, includes a ternary compound semiconductor including a metal atom, and has a concentration gradient of the metal atom in a direction from the anode toward the cathode, and
• a band gap of the inorganic filler becomes smaller in the direction from the anode toward the cathode.