Chip-type light emitting device having precisely coated wavelength-converting layer and packaged structure thereof

• US 8,614,453 B2
• Filed: 05/27/2011
• Issued: 12/24/2013
• Est. Priority Date: 06/29/2010
• Status: Expired due to Fees

• Current Assignee: Semileds Optoelectronics Company Limited (SemiLEDs Inc)
• Original Assignee: Semileds Optoelectronics Company Limited (SemiLEDs Inc)
• Inventors: Chang, Yuan-Hsiao, Kao, Hung-Jen, Liu, Wen-Huang, Dan, Chung-Che
• Primary Examiner(s): Toledo, Fernando L
• Assistant Examiner(s): HALL, VICTORIA KATHLEEN
• Application Number:
  US13/118,336
• Publication Number:
  US 20110316027A1
• Time in Patent Office: 942 Days
• Field of Search: 257 79-103, 257E33001-E33061, 438 22- 47
• US Class Current: 257/98
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/49107 on the semiconductor or solid-state body
• CPC Class Codes: H01L 2224/73265 Layer and wire connectors
• CPC Class Codes: H01L 23/24 solid or gel at the normal operating temperature of the device H01L23/3135 takes precedence
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 33/505 characterised by the shape, e.g. plate or foil

Abstract

The invention relates to a chip-type light emitting device including one or more light emitting semiconductors and one or more frames provided over a top of the one or more light emitting semiconductors.

Claims

1. A chip-type light emitting device comprising:

a substrate;

a light emitting semiconductor coupled to the substrate configured to emit light having a wavelength, the light emitting semiconductor having a surface area comprising an emitting surface and a side portion;

a first frame on and contacting the emitting surface of the light emitting semiconductor and a second frame on the substrate; and

a plurality of wavelength converting layers on the light emitting semiconductor including a first wavelength converting layer in contact with a portion of the light emitting semiconductor and confined by the first frame, the first wavelength converting layer configured to convert the wavelength of the light to a first wavelength, and a second wavelength converting layer in contact with the light emitting semiconductor, encapsulating the first wavelength converting layer, and confined by the second frame, the second wavelength converting layer configured to convert the wavelength of the light to a second wavelength.

2. The chip-type light emitting device of claim 1 wherein the first wavelength and the second wavelength are selected such that the device emits white light having a correlated color temperature.

3. The chip-type light emitting device of claim 1 wherein each wavelength-converting layer includes a plurality of fluorescent particles mixed with an organic chemical.

4. The chip-type light emitting device of claim 3 wherein a weight ratio of the fluorescent particles to the organic chemical is about 0.6 to 8.

5. The chip-type light emitting device of claim 3 wherein the organic chemical comprises a material selected from the group consisting of silicone resin and epoxy resin.

6. The chip-type light emitting device of claim 1 wherein each wavelength-converting layer includes a plurality of fluorescent particles mixed with a glass.

7. The chip-type light emitting device of claim 1 wherein the first frame and the second frame comprise a transparent material.

8. The chip-type light emitting device of claim 1 wherein the first frame and the second frame comprise a metal layer.

9. The chip-type light emitting device of claim 1 further comprising a package containing the chip-type light emitting device comprising a leadframe attached to the substrate and an encapsulating layer encapsulating the light emitting semiconductor.

10. The chip-type light emitting device of claim 9 wherein the first wavelength and the second wavelength are selected such that the package emits white light having a correlated color temperature.