Ultraviolet light emitting device

An ultraviolet light emitting device comprising:

• a substrate;
• an ultraviolet light emitting element;
• a bonding layer;
• a fluororesin film;
• and
• a fluorocarbon compound, wherein:
• the substrate is in at least partial contact with the ultraviolet light emitting element;
• the ultraviolet light emitting element includes a first surface having an electrode, a second surface opposite to the first surface, and a side surface;
• the bonding layer bonds the electrode on the first surface of the ultraviolet light emitting element and a part of the mounting surface of the substrate;
• the fluororesin film is a flexible material configured to transmit ultraviolet light;
• the substrate and the fluororesin film are disposed in a state where the ultraviolet light emitting element is sandwiched therebetween;
• the fluorocarbon compound is a liquid at normal temperature and pressure;
• and
• the fluorocarbon compound fills a gap between the side surface of the ultraviolet light emitting element and the fluororesin film in a state of being in contact with the side surface and the fluororesin film,
• wherein an air layer filled with gas comprising a closed space is disposed between the substrate and the ultraviolet light emitting element.