Solid state lighting devices incorporating notch filtering materials

• US 9,960,322 B2
• Filed: 04/23/2014
• Issued: 05/01/2018
• Est. Priority Date: 04/23/2014
• Status: Active Grant

• Current Assignee: Creeled Incorporated
• Original Assignee: CREE Incorporated (Wolfspeed, Inc.)
• Inventors: van de Ven, Antony Paul
• Primary Examiner(s): Pizarro, Marcos D
• Application Number:
  US14/259,890
• Publication Number:
  US 20150311402A1
• Time in Patent Office: 1,469 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 9/233 specially adapted for generating a spot light distribution, e.g. for substitution of reflector lamps
• CPC Class Codes: F21K 9/62 using mixing chambers, e.g. housings with reflective walls
• 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 2224/48091 Arched
• CPC Class Codes: H01L 2224/73265 Layer and wire connectors
• 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 2924/181 Encapsulation
• CPC Class Codes: H01L 33/44 characterised by the coatings, e.g. passivation layer or anti-reflective coating
• CPC Class Codes: H01L 33/56 Materials, e.g. epoxy or silicone resin

Abstract

Solid state lighting devices include one or more notch filtering materials arranged to filter light emissions to exhibit a spectral notch. At least one notch filtering material may be arranged in at least one coating deposited directly on an emitter chip or on a lumiphoric material that itself is coated or otherwise deposited on an emitter chip. A notch filtering material may be combined with a lumiphoric material. Emissions of a resulting lighting device may include a CRI Ra value of at least 80 and a GAI value in a range of from 75 to 100 or from 80 to 100.

Claims

1. A solid state lighting device comprising:

at least one electrically activated solid state emitter chip; and

a coating deposited on the at least one electrically activated solid state emitter chip, the coating including a lumiphoric material blended with a notch filtering material;

wherein;

the lumiphoric material is arranged to receive at least a portion of emissions of the at least one electrically activated solid state emitter chip and responsively emit lumiphor emissions; and

the notch filtering material is arranged to receive at least a portion of the lumiphor emissions and filter the received lumiphor emissions to exhibit a spectral notch.

2. The solid state lighting device according to claim 1, wherein the coating comprises a spray coating.

3. The solid state lighting device according to claim 1, wherein the coating comprises a conformal coating.

4. The solid state lighting device according to claim 1, further comprising an encapsulant material arranged on or over the coating.

5. The solid state lighting device according to claim 1, wherein the notch filtering material comprises at least one of lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, scandium, or yttrium.

6. The solid state lighting device according to claim 1, wherein the notch filtering material comprises a color pigment.

7. The solid state lighting device according to claim 1, wherein emissions of the solid state lighting device comprise at least one of the following features (i) or (ii):

(i) a gamut area index (GAI) value in a range of from 80 to 100, or (ii) a color rendering index (CRI) value of at least 80.

8. A solid state lighting device comprising:

at least one electrically activated solid state emitter chip mounted over a substrate or submount;

a lumiphoric material arranged in a lumiphoric material coating comprising lumiphoric material particles deposited directly on the at least one electrically activated solid state emitter chip to receive at least a portion of emissions of the at least one electrically activated solid state emitter chip and responsively emit lumiphor emissions; and

a notch filtering material arranged in a filter coating or layer deposited directly on the lumiphoric material coating, wherein the notch filtering material is arranged to receive at least a portion of the lumiphor emissions and filter the received lumiphor emissions to exhibit a spectral notch;

wherein each of the lumiphoric material coating and the filter coating or layer is devoid of contact with the substrate or submount.

9. The solid state lighting device according to claim 8, wherein:

the lumiphoric material coating comprises a first spray coating layer; and

the filter coating or layer comprises a second spray coating layer.

10. The solid state lighting device according to claim 8, wherein the filter coating or layer comprises an encapsulant material.

11. The solid state lighting device according to claim 8, wherein the notch filtering material comprises at least one of lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, scandium, or yttrium.

12. The solid state lighting device according to claim 8, wherein the notch filtering material comprises at least one color pigment.

13. The solid state lighting device according to claim 8, wherein emissions of the solid state lighting device comprise at least one of the following features (i) or (ii):

(i) a gamut area index (GAI) value in a range of from 80 to 100, or (ii) a color rendering index (CRI) value of at least 80.

14. A light bulb or light fixture comprising the solid state lighting device of claim 8.

15. The solid state lighting device according to claim 8, wherein:

the lumiphoric material coating comprises a conformal lumiphoric material coating with a substantially uniform thickness over at least one surface of the at least one electrically activated solid state emitter chip; and

the filter coating or layer comprises a conformal filter coating or layer with a substantially uniform thickness over the conformal lumiphoric material coating.

16. A solid state lighting device comprising:

at least one electrically activated solid state emitter;

a lumiphoric material arranged to receive at least a portion of emissions of the at least one electrically activated solid state emitter and responsively emit lumiphor emissions; and

a notch filtering material arranged to receive at least a portion of the lumiphor emissions and filter the received lumiphor emissions to exhibit a spectral notch;

wherein emissions of the solid state lighting device have (i) a color rendering index (CRI Ra) value of at least 80, and (ii) a gamut area index (GAI) value in a range of from 80to 100.

17. The solid state lighting device according to claim 16, wherein the at least one electrically activated solid state emitter comprises at least one light emitting diode (LED) chip, and the notch filtering material is arranged in contact with at least one surface of the at least one LED chip.

18. The solid state lighting device according to claim 16, wherein:

the at least one electrically activated solid state emitter comprises at least one light emitting diode (LED) chip; and

the notch filtering material is arranged in contact with at least one surface of the lumiphoric material.

19. The solid state lighting device according to claim 16, further comprising a reflector cup or boundary wall defining a cavity, wherein the at least one electrically activated solid state emitter is arranged within the cavity, the notch filtering material is arranged within an encapsulant material, and at least a portion of the encapsulant material is within the cavity.

20. The solid state lighting device according to claim 16, wherein the notch filtering material is embodied in a coating arranged on the at least one electrically activated solid state emitter.

21. A method for fabricating at least one solid state lighting device according to claim 16, the method comprising:

fabricating a plurality of electrically activated solid state emitters on an emitter substrate;

coating the plurality of electrically activated solid state emitters with at least one coating material layer, wherein the at least one coating material layer comprises a lumiphoric material and comprises a notch filtering material; and

separating the plurality of electrically activated solid state emitters into a plurality of discrete coated electrically activated solid state light emitters.

22. The method according to claim 21, wherein said coating comprises spray coating.

23. The method according to claim 21, further comprising:

mounting, on a substrate or submount, at least one coated electrically activated solid state light emitter of the plurality of discrete coated electrically activated solid state light emitters; and

establishing at least one electrical connection between the at least one coated electrically activated solid state light emitter and at least one conductor or conductive region associated with the substrate or submount.