Structured phosphor tape article

• US 20070001182A1
• Filed: 06/30/2005
• Published: 01/04/2007
• Est. Priority Date: 06/30/2005
• Status: Abandoned Application

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Thompson, David, Meixner, Larry, Schardt, Craig
• Application Number:
  US11/171,933
• Publication Number:
  US 20070001182A1
• Time in Patent Office: Days
• US Class Current: 257/98
• CPC Class Codes: C09K 11/02 Use of particular materials as binders, particle coatings or suspension media therefor
• CPC Class Codes: C09K 11/7774 Aluminates
• CPC Class Codes: H01L 2933/0041 relating to wavelength conversion elements
• CPC Class Codes: H01L 33/44 characterised by the coatings, e.g. passivation layer or anti-reflective coating
• 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 33/508 having a non-uniform spatial arrangement or non-uniform concentration, e.g. patterned wavelength conversion layer, wavelength conversion layer with a concentration gradient of the wavelength conversion material

Abstract

A phosphor tape article includes a phosphor layer having a phosphor and a polymeric binder material and a structured surface, and a pressure sensitive adhesive layer disposed adjacent the phosphor layer such that light transmitted through the pressure sensitive layer is received by the phosphor layer through the structured surface. The pressure sensitive layer can also have one or more structured surface, which in some cases can be complimentary with the structured surface of the phosphor layer. Light emitting devices including phosphor tape and methods of making such devices are also disclosed.

Claims

1. A phosphor tape article, comprising:

a phosphor layer comprising a phosphor and a polymeric binder material, the phosphor layer having a structured surface; and

a pressure sensitive adhesive layer disposed adjacent the phosphor layer such that light transmitted through the pressure sensitive adhesive layer is received by the phosphor layer through the structured surface.

2. An article according to claim 1, wherein the pressure sensitive adhesive layer also has a structured surface.

3. An article according to claim 2, wherein the structured surface of the pressure sensitive adhesive layer is complimentary with the structured surface of the phosphor layer.

4. An article according to claim 1, further comprising a release layer disposed on the pressure sensitive adhesive layer, wherein the pressure sensitive adhesive layer is disposed between the phosphor layer and the release layer.

5. An article according to claim 1, further comprising a hardcoat layer disposed on the phosphor layer, wherein the phosphor layer is disposed between the pressure sensitive adhesive layer and the hardcoat layer.

6. An article according to claim 1, wherein the pressure sensitive adhesive layer is disposed on the phosphor layer.

7. An article according to claim 1, wherein the pressure sensitive adhesive layer comprises a pressure sensitive adhesive that builds adhesion over a time interval.

8. An article according to claim 1, wherein the pressure sensitive adhesive layer comprises a curing agent.

9. An article according to claim 1, wherein the pressure sensitive adhesive layer comprises a silicone polymer.

10. An article according to claim 1, wherein the phosphor layer structured surface comprises a plurality of linear prismatic projections having an aspect ratio in a range of 0.5 to 10.

11. An article according to claim 1, wherein the phosphor layer structured surface comprises a plurality of pyramidal or conical projections having an aspect ratio in a range of 0.5 to 10.

12. A light emitting device, comprising:

an encapsulated LED that includes an ultraviolet or blue LED die disposed within a transparent encapsulating material; and

a phosphor tape disposed on the transparent encapsulating material, wherein the phosphor tape comprises;

a phosphor layer comprising a phosphor and a polymeric binder material, the phosphor layer having a structured surface; and

a pressure sensitive adhesive layer disposed adjacent the phosphor layer such that light transmitted through the pressure sensitive adhesive layer is received by the phosphor layer through the structured surface.

13. A device according to claim 12, wherein the pressure sensitive layer also has a structured surface on at least one side thereof.

14. A device according to claim 12, wherein the pressure sensitive adhesive layer further comprises an ultraviolet or blue light curing agent.

15. A device according to claim 12, wherein the encapsulating material has a first index of refraction, the pressure sensitive adhesive layer has a second index of refraction, and the phosphor layer polymeric binder material has a third index of refraction, and the first, second and third index of refractions all have a value within 0.1 at a visible wavelength.

16. A device according to claim 12, wherein the encapsulating material has a first index of refraction, the pressure sensitive adhesive layer has a second index of refraction, and the phosphor layer polymeric binder material has a third index of refraction, and the second index of refraction has a value between the first and third index of refraction.

17. A device according to claim 12, wherein the structured surface comprises a plurality of prismatic projections directed toward the LED die.

18. A device according to claim 17, wherein the plurality of prismatic projections have an aspect ratio in a range of 0.5 to 10.

19. A device according to claim 12, wherein the structured surface comprises a plurality of pyramidal or conical projections directed toward the LED die.

20. A device according to claim 19, wherein the plurality of pyramidal or conical projections have an aspect ratio in a range of 0.5 to 10.