LIGHT-EMITTING DEVICE

• US 20130093313A1
• Filed: 10/15/2012
• Published: 04/18/2013
• Est. Priority Date: 10/13/2011
• Status: Active Grant

• Current Assignee: Citizen Watch Co Limited (Citizen Electronics Company Limited)
• Original Assignee: Citizen Electronics Company Limited, Citizen Holdings Co., Ltd. (Citizen Electronics Company Limited)
• Inventors: OYAMADA, Nodoka
• Granted Patent: US 8,853,934 B2
• Time in Patent Office: Days
• US Class Current: 313/503
• CPC Class Codes: F21K 9/64 using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer
• CPC Class Codes: H01L 2224/14 of a plurality of bump connectors
• CPC Class Codes: H01L 2224/16225 the item being non-metallic, e.g. insulating substrate with or without metallisation
• CPC Class Codes: H01L 2924/18161 of a flip chip
• CPC Class Codes: H01L 2933/0041 relating to wavelength conversion elements
• CPC Class Codes: H01L 33/505 characterised by the shape, e.g. plate or foil
• CPC Class Codes: H01L 33/508 having a non-uniform spatial arrangement or non-uniform concentration, e.g. patterned wavelength conversion layer, wavelength conversion layer with a concentration gradient of the wavelength conversion material
• CPC Class Codes: H01L 33/54 having a particular shape
• CPC Class Codes: H10K 50/125 specially adapted for multicolour light emission, e.g. for emitting white light
• CPC Class Codes: H10K 59/38 comprising colour filters or colour changing media [CCM]

Abstract

A light-emitting device includes a phosphor plate including an upper surface, a lower surface opposite to the upper surface, a peripheral side surface extending between a peripheral edge of the upper surface and a peripheral edge of the lower surface of the phosphor plate, a light-emitting element including an upper surface, a lower surface opposite to the upper surface, a peripheral side surface extending between a peripheral edge of the upper surface and a peripheral edge of the lower surface of the light-emitting element. The lower surface of the phosphor plate includes a concave that is filled with an adhesive and the lower surface of the phosphor plate is disposed on the upper surface of the light-emitting element. The phosphor plate may contain a first phosphor, and the adhesive filled in the concave that is provided at the lower surface of the phosphor plate may include a second phosphor.

Claims

1. A light-emitting device comprising:

a phosphor plate including an upper surface, a lower surface opposite to the upper surface, a peripheral side surface extending between a peripheral edge of the upper surface and a peripheral edge of the lower surface of the phosphor plate;

a light-emitting element including an upper surface, a lower surface opposite to the upper surface, a peripheral side surface extending between a peripheral edge of the upper surface and a peripheral edge of the lower surface of the light-emitting element; and

the lower surface of the phosphor plate including a concave and disposed on the upper surface of the light-emitting element,

the concave included in the lower surface of the phosphor plate being filled with an adhesive.

2. The light-emitting device according to claim 1:

wherein the phosphor plate containing a first phosphor,

the adhesive that is filled in the concave of the lower surface of the phosphor plate contains a second phosphor, and

the first phosphor contained in the phosphor plate is different from the second phosphor contained in the adhesive that is filled in the concave of the lower surface of the phosphor plate.

3. The light-emitting device according to claim 2:

the first phosphor contained in the phosphor plate comprising yttrium aluminum garnet.

4. The light-emitting device according to claim 2:

the first phosphor contained in the phosphor plate comprising lutetium aluminum garnet.

5. The light-emitting device according to claim 2:

the first phosphor contained in the phosphor plate comprising β

-SiAlON.

6. The light-emitting device according to claim 2:

the second phosphor contained in the adhesive that is filled in the concave of the lower surface of the phosphor plate comprising CaAlSiN₃;

Eu.

7. The light-emitting device according to claim 2:

the second phosphor contained in the adhesive filled in the concave of the lower surface of the phosphor plate comprises α

-SiAlON.

8. The light-emitting device according to claim 1,

wherein a center of the concave included in the lower surface of the phosphor plate coincides with a center of the upper surface of the light-emitting element as viewed from above.

9. The light-emitting device according to claim 1:

the number of the concave included in the lower surface of the phosphor plate is one.

10. The light-emitting device according to claim 1;

the light-emitting element including a p-element electrode and an n-element electrode that are positioned at the lower surface of the light-emitting element.

11. The light-emitting device according to claim 10 further comprising;

a white resin covering the peripheral side surface of the light-emitting element and the lower surface of the light-emitting element except the p-element electrode and the n-element electrode of the light-emitting element.

12. The light-emitting device according to claim 11;

the lower surface of the phosphor plate being larger in area than the upper surface of the light-emitting element with the peripheral edge of the lower surface of the phosphor plate protruding from the peripheral edge of the upper surface of the light-emitting element;

the white resin being in contact with the lower surface of the phosphor plate at an area of the lower surface of the phosphor plate that protrudes from the peripheral edge of the upper surface of the light-emitting element, and the white resin being flush with the peripheral side surface of the phosphor plate at a peripheral side surface of the white resin.

13. The light-emitting device according to claim 1;

the concave is positioned within the peripheral edge of the upper surface of the light-emitting element in a top plan view.

14. The light-emitting device according to claim 1:

wherein the adhesive filled in the concave provided in the lower surface of the phosphor plate is transparent.

15. The light-emitting device according to claim 1:

the number of the concave included in the lower surface of the phosphor plate is one or more.

16. The light-emitting device according to claim 15:

the concaves being lined up along the peripheral edge of the upper surface of the light-emitting element in a top plan view.

17. The light-emitting device according to claim 15:

wherein the phosphor plate contains a first phosphor, and the adhesive filled in the concaves of the lower surface of the phosphor plate contains a second phosphor that is different from the first phosphor included in the phosphor plate.

18. A light-emitting device comprising:

a phosphor plate including an upper surface, a lower surface opposite to the upper surface, a peripheral side surface extending between a peripheral edge of the upper surface and a peripheral edge of the lower surface of the phosphor plate;

a light-emitting element including an upper surface, a lower surface opposite to the upper surface, a peripheral side surface extending between a peripheral edge of the upper surface and a peripheral edge of the lower surface of the light-emitting element; and

the lower surface of the phosphor plate including concaves and disposed on the upper surface of the light-emitting element,

the concaves included in the lower surface of the phosphor plate being filled with an adhesive.

19. The light-emitting device according to claim 18:

wherein the phosphor plate containing a first phosphor,

the adhesive that is filled in the concaves of the lower surface of the phosphor plate contains a second phosphor, and

the first phosphor contained in the phosphor plate is different from the second phosphor contained in the adhesive that is filled in the concaves of the lower surface of the phosphor plate.

20. A light-emitting device comprising:

a phosphor plate including an upper surface, a lower surface opposite to the upper surface, a peripheral side surface extending between a peripheral edge of the upper surface and a peripheral edge of the lower surface of the phosphor plate;

a plurality of light-emitting elements each including an upper surface, a lower surface opposite to the upper surface, a peripheral side surface extending between a peripheral edge of the upper surface and a peripheral edge of the lower surface of the each light-emitting element; and

the lower surface of the phosphor plate including a plurality of concaves and disposed on the upper surfaces of the plurality of light-emitting elements,

the concaves included in the lower surface of the phosphor plate being filled with an adhesive.