Luminescence device, and display device including same

A luminescence device comprising:

• a first electrode;
• a hole transport region on the first electrode;
• an emission layer on the hole transport region;
• an electron transport region on the emission layer;
• a second electrode on the electron transport region;
• and
• a capping layer on the second electrode and comprising a metal atom and a metal halide compound,
• wherein the metal atom contains at least one of a lanthanide metal, a transition metal, or a post-transition metal and the metal halide compound is formed by combining an alkali metal atom and a halogen atom.

A display device comprising:

• a thin film transistor;
• and
• a luminescence device on the thin film transistor,
• wherein the luminescence device includes:
• a first electrode,
• a hole transport region on the first electrode,
• an emission layer on the hole transport region,
• an electron transport region on the emission layer,
• a second electrode on the electron transport region, and
• a capping layer on the second electrode and comprising a metal atom and a metal halide compound,
• wherein the metal atom contains at least one of a lanthanide metal, a transition metal, or a post-transition metal and the metal halide compound is formed by combining an alkali metal atom and a halogen atom.