Methods of making phosphor based light sources having an interference reflector

• US 20040116033A1
• Filed: 12/02/2003
• Published: 06/17/2004
• Est. Priority Date: 01/27/2003
• Status: Active Grant

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Wheatley, John A., Weber, Michael F., Ouderkirk, Andrew J.
• Granted Patent: US 7,118,438 B2
• Time in Patent Office: Days
• US Class Current: 445/23
• CPC Class Codes: H01L 2224/48091 Arched
• 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 33/44 characterised by the coatings, e.g. passivation layer or anti-reflective coating
• CPC Class Codes: H01L 33/505 characterised by the shape, e.g. plate or foil
• 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
• CPC Class Codes: H01L 33/60 Reflective elements
• CPC Class Codes: Y10T 428/14 Layer or component removable to expose adhesive

Abstract

A method of manufacturing a light source includes the steps of providing a first flexible sheet comprising a first multilayer interference reflector, providing a carrier film to carry the reflector, dividing the reflector into individual pieces carried by the carrier film, and positioning at least one of the individual pieces proximate an LED capable of emitting light that excites a phosphor material.

Claims

1. A method of manufacturing a light source, comprising the steps of:

providing a first flexible sheet comprising a first multilayer interference reflector;

providing a carrier film to carry the reflector;

dividing the reflector into individual pieces carried by the carrier film; and

positioning at least one of the individual pieces proximate an LED capable of emitting light that excites a phosphor material.

2. The method according to claim 1, wherein the step of providing a first flexible sheet comprises providing a first flexible sheet comprising a first polymeric multilayer interference reflector.

3. The method according to claim 1, further comprising applying a layer of phosphor material adjacent the first multilayer interference reflector.

4. The method according to claim 3, wherein the step of applying comprises coating the layer of phosphor material on the first multilayer interference reflector.

5. The method according to claim 3, wherein the step of applying comprises applying a layer of phosphor material comprising an adhesive material to the first multilayer interference reflector.

6. The method according to claim 3, wherein the step of applying a layer of phosphor material further comprises applying a layer of adhesive between the layer of phosphor material and the first multilayer interference reflector.

7. The method according to claim 3, wherein the step of applying a layer of phosphor material further comprises applying a layer of discontinuous phosphor material to the first flexible sheet to form a phosphor-reflector assembly.

8. The method according to claim 3, further comprising:

providing a second flexible sheet comprising a second multilayer interference reflector and positioning it adjacent to the layer of phosphor material opposite the first flexible sheet.

9. The method according to claim 8, wherein the providing a first flexible sheet step comprises providing a first flexible sheet comprising a first multilayer short-pass or long-pass reflector.

10. The method according to claim 9, wherein the providing a second flexible sheet step comprises providing a second flexible sheet comprising a second multilayer short-pass or long-pass reflector.

11. The method according to claim 8, wherein the providing a first flexible sheet step comprises providing a first flexible sheet comprising a first multilayer long-pass reflector, and the providing a second flexible sheet step comprises providing a second flexible sheet comprising a second multilayer short-pass reflector.

12. The method according to claim 1, wherein the step of providing a first flexible sheet comprises providing a first flexible sheet comprising a first polymeric multilayer interference reflector comprising alternating layers of a first and second thermoplastic polymer and wherein at least some of the layers are birefringent.

13. The method according to claim 3, wherein the step of applying comprises applying a discontinuous layer of phosphor material adjacent the first multilayer interference reflector.

14. The method according to claim 13, wherein the step of applying comprises applying a patterned layer of phosphor material adjacent the first multilayer interference reflector.

15. The method according to claim 13, wherein the step of applying comprises applying a plurality of dots of phosphor material adjacent the first multilayer interference reflector.

16. The method according to claim 3, further comprising the step of surface treating the first multilayer interference reflector to promote adhesion of the phosphor material to the first multilayer interference reflector prior to applying a layer of phosphor material adjacent the first multilayer interference reflector.