Ultraviolet light-emitting device, method for manufacturing ultraviolet light-emitting device and method for manufacturing ultraviolet light-emitting module

A method for manufacturing an ultraviolet light-emitting device, the method comprising:

• a first step of sealing a nitride semiconductor ultraviolet light-emitting element flip-chip mounted on a base to form a lens for focusing or diffusing light emitted from the nitride semiconductor ultraviolet light-emitting element;
• wherein the lens is formed of an amorphous fluororesin in which a structural unit of a polymer or copolymer has a fluorine-containing aliphatic cyclic structure and a terminal functional group is a perfluoroalkyl group;
• and,
• in the first step or a subsequent step, the amorphous fluororesin constituting the lens is heated to a glass transition temperature or higher, a pressure of 35 MPa or higher is applied to the amorphous fluororesin, and the lens is cooled to a temperature lower than the glass-transition temperature by 30° C. or more while the pressure is applied, thereby densifying the amorphous fluororesin.

A method for manufacturing an ultraviolet light-emitting module, the method comprising:

• a third step of mounting one or more of ultraviolet light-emitting device having a nitride semiconductor ultraviolet light-emitting element flip-chip mounted on a base and sealed by a lens on a mounting member;
• and
• a fourth step of densifying the amorphous fluororesin after the third step,
• wherein the lens is formed of an amorphous fluororesin in which a structural unit of a polymer or copolymer has a fluorine-containing aliphatic cyclic structure and a terminal functional group is a perfluoroalkyl group;
• and
• in the fourth step, the amorphous fluororesin constituting the lens is heated to a glass-transition temperature or higher, a pressure of 35 MPa or higher is applied to the amorphous fluororesin, and the lens is cooled to a temperature lower than the glass-transition temperature by 30° C. or more while the pressure is applied.