Ultraviolet light emitting device

An ultraviolet light emitting device comprising:

• a first substrate having a main surface;
• a second substrate facing the main surface of the first substrate;
• a gas in a space between the first substrate and the second substrate;
• electrodes directly or indirectly on the main surface of the first substrate;
• a dielectric layer that is located directly or indirectly on the main surface of the first substrate and covers the electrodes;
• and
• a first light-emitting layer that is located directly or indirectly on the dielectric layer and emits ultraviolet light in the gas due to electrical discharge between the electrodes, the first light-emitting layer being absent in second regions but present in first regions on the dielectric layer different from the second regions, the second regions including at least part of regions directly above the electrodes.

An ultraviolet light emitting device comprising:

• a first substrate having a main surface;
• a second substrate facing the main surface of the first substrate;
• a gas in a space between the first substrate and the second substrate;
• electrodes directly or indirectly on the main surface of the first substrate;
• a dielectric layer that is located directly or indirectly on the main surface of the first substrate and covers the electrodes;
• a first light-emitting layer that is located directly or indirectly on the dielectric layer and emits ultraviolet light in the gas due to electrical discharge between the electrodes;
• and
• a thin film that is located directly or indirectly on the first light-emitting layer and contains at least one selected from the group consisting of magnesium oxide, calcium oxide, barium oxide, and strontium oxide.