Phosphor based light source component

• US 7,394,188 B2
• Filed: 04/13/2007
• Issued: 07/01/2008
• Est. Priority Date: 01/27/2003
• Status: Expired due to Fees

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Wheatley, John A., Ouderkirk, Andrew J.
• Primary Examiner(s): Roy; Sikha
• Application Number:
  US11/735,137
• Publication Number:
  US 20070182299A1
• Time in Patent Office: 445 Days
• Field of Search: None
• US Class Current: 313/110
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48247 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 2924/00012 Relevant to the scope of the group, the symbol of which is combined with the symbol of this group
• 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 2924/01025 Manganese [Mn]
• CPC Class Codes: H01L 2924/01077 Iridium [Ir]
• CPC Class Codes: H01L 2924/09701 Low temperature co-fired ceramic [LTCC]
• CPC Class Codes: H01L 2924/12041 LED
• CPC Class Codes: H01L 2924/181 Encapsulation
• CPC Class Codes: H01L 33/46 Reflective coating, e.g. dielectric Bragg reflector
• CPC Class Codes: H01L 33/507 the elements being in intimate contact with parts other than the semiconductor body or integrated with parts other than the semiconductor body

Abstract

A method of making a light source includes the steps of forming a first optical component having a phosphor material in fixed relation to a first multilayer interference reflector, providing a second optical component having an LED capable of emitting light that excites the phosphor material, and positioning the first optical component to receive emitted light from the second optical component. Corresponding articles are also disclosed.

Claims

1. A phosphor-reflector component, comprising;

an optically transparent body;

a first multilayer interference reflector disposed on or within the optically transparent body; and

a phosphor material disposed on or within the optically transparent body;

wherein the phosphor-reflector component is a preformed unitary component adapted to couple to a separate light emitting diode (LED) component.

2. The component of claim 1, wherein the first multilayer interference reflector comprises a first polymeric multilayer interference reflector.

3. The component of claim 2, wherein the phosphor material is coated on the first polymeric multilayer interference reflector.

4. The component of claim 2, wherein the phosphor material is laminated on the first polymeric multilayer interference reflector.

5. The component of claim 1, wherein the phosphor material comprises an adhesive material.

6. The component of claim 1, wherein the first multilayer interference reflector comprises alternating layers of a first and second thermoplastic polymer and wherein at least some of the layers are birefringent.

7. The component of claim 1, further comprising a second multilayer interference reflector disposed on or within the optically transparent body.

8. The component of claim 7, wherein the phosphor material is in layer form and wherein the second multilayer interference reflector is adjacent the layer of phosphor material opposite the first multilayer interference reflector.

9. The component of claim 8, wherein the second multilayer interference reflector is a short-pass or long-pass reflector.

10. The component of claim 7, wherein the first multilayer interference reflector is a long-pass reflector and the second multilayer interference reflector is a short-pass reflector.

11. The component of claim 1, wherein the first multilayer interference reflector is a short-pass or long-pass reflector.

12. The component of claim 1, wherein the LED component includes an LED disposed within a second optically transparent body.

13. The component of claim 12, wherein the first-mentioned optically transparent body has a first surface adapted to mate with a second surface of the second optically transparent body.

14. The component of claim 1, wherein the phosphor material is in the form of a discontinuous layer.

15. The component of claim 14, wherein the discontinuous layer comprises a pattern of distinct regions.

16. The component of claim 15, wherein the regions each have an area of less than 10000 microns².

17. The component of claim 15, wherein the regions comprise a first region that emits red light, a second region that emits green light, and a third region that emits blue light, when illuminated with excitation light.

18. The component of claim 15, wherein at least a first region emits light at a first wavelength and a second region emits light at a second wavelength different than the first wavelength.