Light-emitting device array with individual cells

• US 8,937,324 B2
• Filed: 08/30/2010
• Issued: 01/20/2015
• Est. Priority Date: 08/30/2010
• Status: Active Grant

• Current Assignee: Bridgelux Incorporated
• Original Assignee: Bridgelux Incorporated
• Inventors: Helbing, Rene Peter, Xu, Tao
• Primary Examiner(s): DIALLO, MAMADOU L
• Application Number:
  US12/871,792
• Publication Number:
  US 20100320487A1
• Time in Patent Office: 1,604 Days
• Field of Search: 257/98, 257/99, 257/100, 257/432, 257/676, 257/778, 257/E33.072, 257/E33.073, 257/E33.075, 257/E33.059, 438/26, 438/27, 438/29
• US Class Current: 257/89
• CPC Class Codes: H01L 2224/32 of an individual layer connector
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H01L 33/50 Wavelength conversion elements

Abstract

A light-emitting device and a method for manufacturing the light-emitting device is disclosed. Such a light-emitting device comprises a substrate, a plurality of cells disposed in the substrate, and a plurality of semiconductor dice, wherein each of the plurality of cells accommodates at least one of the plurality of dice. Each of the plurality of cells may be filled with an encapsulant, phosphor or a mixture of an encapsulant with phosphor to control light characteristics of the light-emitting device. In an alternative aspect, cells may be filled with an encapsulant, and comprise a transparent cover coated with or filled with phosphors to control light characteristics of the light-emitting device.

Claims

1. A light-emitting apparatus;

comprising;

a substrate;

a plurality of cells disposed in the substrate;

a layer of material possessing diffusive reflectivity applied onto at least a surface of the plurality of cells;

a first mixture of encapsulate and a first phosphor having a first color, the first mixture disposed into at least a first cell of the plurality of cells;

a second mixture of encapsulate and a second phosphor having a second color, the second mixture disposed into at least a second cell of the plurality of cells;

a plurality of semiconductor dice;

wherein each of the plurality of cells accommodates at least one of the pluralities of semiconductor dice,

wherein the first phosphor is the only phosphor in the first mixture and the second phosphor is the only phosphor in the second mixture, and

wherein the first color is different from the second color.

2. The apparatus according to claim 1, wherein an encapsulate is disposed into each of the plurality of cells not containing the first or second mixture.

3. The apparatus according to claim 1 further comprising

a plurality of transparent covers, each of the plurality of covers being disposed over one of the plurality of cells.

4. The apparatus according to claim 3, wherein at least one of the plurality of the transparent covers is coated with or filled with phosphor.

5. The apparatus according to claim 3, wherein at least two of the plurality of the transparent covers are coated with or filled with phosphor of different color.

6. A method for manufacturing a light-emitting device, comprising:

manufacturing a substrate;

disposing a plurality of cells in the substrate;

applying a layer of material possessing diffusive reflectivity onto at least a surface of the plurality of cells;

disposing a first mixture of encapsulant and a first phosphor having a first color into at least a first cell of the plurality of cells;

disposing a second mixture of encapsulate and a second phosphor having a second color into at least a second cell of the plurality of cells;

and

disposing a plurality of semiconductor dice into the plurality of cells;

wherein each of the plurality of cells accommodates at least one of the plurality of semiconductor dice,

wherein the first phosphor is the only phosphor in the first mixture and the second phosphor is the only phosphor in the second mixture, and

wherein the first color is different from the second color.

7. The method according to claim 6, wherein an encapsulant is disposed into each of the plurality of cells not containing the first or second mixture.

8. The method according to claim 6 further comprising disposing a transparent cover over each of the plurality of cells.

9. The method according to claim 8, wherein at least one of the plurality of the transparent covers is coated with or filled with phosphor.

10. The method according to claim 8, wherein at least two of the plurality of the transparent covers are coated with or filled with phosphor of different color.