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

Patent metadata

Field	Value
Publication number	US-11107961-B2
Application number	US-201716753714-A
Country	US
Kind code	B2
Filing date	Nov 2, 2017
Priority date	Nov 2, 2017
Publication date	Aug 31, 2021
Grant date	Aug 31, 2021

Abstract

The ultraviolet light-emitting device includes a base, a nitride semiconductor ultraviolet light-emitting element flip-chip mounted on the base, and a lens for sealing a nitride semiconductor ultraviolet light-emitting element to focus or diffuse light emitted from the nitride semiconductor ultraviolet light-emitting device. The lens is composed 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 a density of the amorphous fluororesin is higher than 2.11 g/cm 3 .

First claim

The invention claimed is:

1. An ultraviolet light-emitting device comprising:
a base; a nitride semiconductor ultraviolet light-emitting element flip-chip mounted on the base; and a lens that seals the nitride semiconductor ultraviolet light-emitting element and focuses or diffuses light emitted from the nitride semiconductor ultraviolet light-emitting device,
wherein the lens is composed 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 a density of the amorphous fluororesin is larger than 2.11 g/cm 3 .

2. The ultraviolet light-emitting device according to claim 1 , wherein the density of amorphous fluororesin constituting the lens is greater than 2.21 g/cm 3 .

3. The ultraviolet light-emitting device according to claim 1 , wherein a part of a surface of the lens may be a spherical surface or a convex curved surface.

4. The ultraviolet light-emitting device according to claim 1 , wherein the emission center wavelength of the nitride semiconductor ultraviolet light-emitting element is 200 nm or more and 365 nm or less.

5. 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.

6. The method for manufacturing an ultraviolet light-emitting device according to claim 5 , the method further comprising:
simultaneously forming the lens for sealing each of a plurality of nitride semiconductor ultraviolet light-emitting elements flip-chip mounted on a base plate in which a plurality of bases are integrated in the first step; and
a second step of dividing the base plate so that one or more of the nitride semiconductor ultraviolet light-emitting element sealed by the lens are included after densifying the amorphous fluororesin constituting the lens.

7. 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.

Assignees

• Soko Kagaku Co Ltd
• Agc Inc

Inventors

• Hirano Akira
• Nagasawa Yosuke
• Ippommatsu Masamichi
• Aosaki Ko
• Suehara Yuki
• Sakane Yoshihiko

Classifications

• H10H20/0363

  of optical field-shaping means · CPC title

• H10H20/0362

  of encapsulations · CPC title

• H10H20/857

  Interconnections, e.g. lead-frames, bond wires or solder balls · CPC title

• H10H20/854 Primary

  characterised by their material, e.g. epoxy or silicone resins · CPC title

• H10H20/825

  containing nitrogen, e.g. GaN · CPC title