Light-emitting device with near full spectrum light output

• US 9,799,804 B2
• Filed: 10/28/2014
• Issued: 10/24/2017
• Est. Priority Date: 10/28/2014
• Status: Active Grant

• Current Assignee: Matrix Lighting Ltd.
• Original Assignee: Matrix Lighting Ltd.
• Inventors: Pun, Cheng Yung
• Primary Examiner(s): Won, Bumsuk
• Assistant Examiner(s): Stern, Jacob R
• Application Number:
  US14/526,095
• Publication Number:
  US 20160118550A1
• Time in Patent Office: 1,092 Days
• CPC Class Codes: F21K 9/232 specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
• 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: F21Y 2115/10 Light-emitting diodes [LED]
• 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 33/504 Elements with two or more wavelength conversion materials

Abstract

A method for providing light and a light-emitting device configured to providing light in accordance thereto is disclosed herein. The method includes emitting light in a monochromatic manner from a light source, wherein the light provided falls in a first spectrum associated with light of a blue color; covering the light source with a red phosphor composite, wherein the red phosphor composite is configured to cause the first spectrum of the light source to shift to a second, intermediary spectrum associated with light of a violet color; and producing light spanning a fuller visual light spectrum from the light of the violet color received from the red phosphor composite-covered light source.

Claims

1. A light-emitting diode (LED), comprising:

a semiconductor device configured to emit light in a monochromatic manner, wherein the light provided falls in a first spectrum associated with light of a blue color having a wavelength from 430 nm to 480 nm;

a red phosphor composite configured to fully cover the semiconductor device, wherein the red phosphor composite is further configured to cause the light emitted by the semiconductor device to shift to a second, intermediary spectrum associated with light of a violet color having a wavelength from 380 nm to 420 nm; and

an overlay having a near semi-spherical shape, the overlay comprising a luminophoric medium configured to completely cover the red phosphor composite such that the light of the violet color received from the red phosphor composite passes through the luminophoric medium, the luminophoric medium being further configured to be excited by the violet light received from the red phosphor composite covered semiconductor device to emit white light, wherein the emitted white light is converted from the violet light received from the red phosphor composite covered semiconductor device.

2. The LED of claim 1, wherein the red phosphor composite comprises a red phosphor and silicon rubber mixture.

3. The LED of claim 1, wherein the semiconductor device comprises an emitting portion configured to emit light, and the LED further comprises a gap between the red phosphor composite to prevent the red phosphor composite from contacting the emitting portion.

4. The LED of claim 1, wherein the semiconductor device comprises an emitting portion configured to emit light, and wherein the red phosphor composite is configured to be in contact with the emitting portion.

5. The LED of claim 1, wherein the emitting portion of the semiconductor device comprises an edge, and the red phosphor composite is configured to be in contact with the edge of the emitting portion.

6. The LED of claim 1, further comprising:

a second semiconductor device configured to emit light in the monochromatic manner;

a substrate configured to support the first semiconductor device and the second semiconductor device; and

a housing configured to enclose the substrate with the first semiconductor device and the second semiconductor device.

7. The LED of claim 1, wherein the luminophoric medium comprising a mixture of fluorescent powder and silicon rubber configured to produce down-converted light from the light emitted by the semiconductor device.

8. The LED of claim 1, further comprising a housing member enclosing the semiconductor device, and wherein the housing member comprises the overlay comprising the luminophoric medium.

9. The LED of claim 1, wherein the luminophoric medium is dispersed in one of a light transmission polymer or glass.

10. The LED of claim 1, wherein the luminophoric medium is dispersed as an exterior film on a light transmission polymer or glass.

11. The LED of claim 1, wherein the luminophoric medium comprises a mixture comprising one of yellow, or yellow and green phosphor powders.

12. A light-emitting device, comprising:

a housing comprising a covering configured to enclose;

(1) at least one semiconductor device configured to emit light in a monochromatic manner, wherein the light provided falls in a first spectrum associated with light of a blue color having a wavelength from 430 nm to 480 nm;

(2) a red phosphor composite configured to fully cover the at least one semiconductor device, wherein the red phosphor composite is further configured to cause the light emitted by the at least one semiconductor device to shift to a second, intermediary spectrum associated with light of a violet color having a wavelength from 380 nm to 420 nm; and

(3) an overlay having a near semi-spherical shape, the overlay comprising a luminophoric medium configured to completely cover the red phosphor composite such that the light of the violet color received from the red phosphor composite passes through the luminophoric medium, the luminophoric medium being further configured to be excited by the violet light received from the red phosphor composite covered semiconductor device to emit white light, wherein the emitted white light is converted from the violet light received from the red phosphor composite covered semiconductor device;

a support coupled to the housing upon which the at least one semiconductor device, the red phosphor composite, and the overlay may be mounted; and

an electrical connection configured to couple the at least one semiconductor device to a power source.

13. A method for providing light comprising:

emitting light in a monochromatic manner from a light source, wherein the light provided falls in a first spectrum associated with light of a blue color having a wavelength from 430 nm to 480 nm;

fully covering the light source with a red phosphor composite, wherein the red phosphor composite is configured to cause the first spectrum of the light source to shift to a second, intermediary spectrum associated with light of a violet color having a wavelength from 380 nm to 420 nm; and

completely covering the red phosphor composite with an overlay having a near semi-spherical shape, the overlay comprising a luminophoric medium such that the light of the violet color received from the red phosphor composite passes through the luminophoric medium, the luminophoric medium configured to be excited by the violet light received from the red phosphor composite covered semiconductor device to emit white light, wherein the emitted white light is converted from the violet light received from the red phosphor composite covered semiconductor device.