Ultraviolet-light-emitting device with adhesive having low glass transition temperature

An adhesive for forming an adhesive joint in an ultraviolet-light-emitting device, which is either the following adhesive (A) or the following adhesive (B) comprising a fluoropolymer having a fluorine-containing alicyclic structure:

• wherein:
• the ultraviolet-light-emitting device comprises a light-emitting element generating ultraviolet light having a wavelength of from 200 to 400 nm, an optical member which transmits the ultraviolet light generated by the light-emitting element and the adhesive joint formed from the adhesive between the light-emitting element and the optical member, wherein the optical member is made of a fluoropolymer having a fluorine-containing alicyclic structure;
• the adhesive (A) is an adhesive in which the glass transition temperature of the fluoropolymer is from 30 to 100° C., and which does not comprise an ultraviolet-shielding agent;
• and
• the adhesive (B) is an adhesive comprising the fluoropolymer and an ultraviolet-shielding agent.