Light emitting assembly, a lamp and a luminaire

• US 9,772,071 B2
• Filed: 08/23/2013
• Issued: 09/26/2017
• Est. Priority Date: 08/24/2012
• Status: Active Grant

• Current Assignee: Signify Holding B.V. (Signify N.V.)
• Original Assignee: Philips Lighting BV (Koninklijke Philips N.V.)
• Inventors: Van Bommel, Ties, Hikmet, Rifat Ata Mustafa
• Primary Examiner(s): GARLEN, ALEXANDER K
• Application Number:
  US14/423,509
• Publication Number:
  US 20150300577A1
• Time in Patent Office: 1,495 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 9/27 Retrofit light sources for lighting devices with two fittings for each light source, e.g. for substitution of fluorescent tubes
• 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: F21V 15/01 Housings, e.g. material or assembling of housing parts F21V15/02 takes precedence housings forming signs or letters G09F13/04
• CPC Class Codes: F21V 9/06 for filtering out ultraviolet radiation
• CPC Class Codes: F21V 9/08 for producing coloured light, e.g. monochromatic; for reducing intensity of light with provision for controlling the colour F21V9/40
• CPC Class Codes: F21Y 2113/13 comprising an assembly of point-like light sources
• 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
• 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 light emitting assembly 100, a lamp and a luminaire are provided. The light emitting assembly 100 comprises a first light source 112, a second light source 118, a first luminescent material 106, a second luminescent material 116 and a light exit window 102. The first light source 112 emits light 110 in a Ultra Violet spectral range. The second light source 118 emits light in a blue spectral range having a first peak wavelength. The first luminescent material 106 is arranged to receive light 110 from the first light source 112 and is configured to absorb light 110 in the Ultra Violet spectral range and to convert a portion of the absorbed light towards light 104 in the blue spectral range. The second luminescent material 116 is arranged to receive light 105 from the second light source 118 and is configured to almost fully convert the received light 105 in the blue spectral range received from the second light source to light with a spectral range of light having a second peak wavelength. The second peak wavelength is larger than the first peak wavelength. The light exit window 102 is arranged to transfer light emitted by the first luminescent material 106 and by the second luminescent material 116 into an ambient of the light emitting assembly 100.

Claims

1. A light emitting assembly, comprising:

a first light source emitting light in a ultraviolet spectral range;

a second light source emitting light in a blue spectral range having a first peak wavelength;

a first luminescent material configured to receive and absorb the light in the ultraviolet spectral range from the first light source and to fully convert the absorbed light towards light having a peak in the blue spectral range;

a second luminescent material configured to receive the light in the blue spectral range from the second light source and to convert the received light towards light of a spectral range having a second peak wavelength, the second peak wavelength being greater than the first peak wavelength; and

a light exit window configured to transfer light emitted by the first luminescent material and by the second luminescent material into an ambient of the light emitting assembly.

2. The light emitting assembly according to claim 1, wherein the second luminescent material is configured to fully convert the received light in the blue spectral range towards light with the second peak wavelength.

3. The light emitting assembly according to claim 1, wherein the light of the spectral range with the second peak wavelength comprises light in at least one of the red, orange, and yellow spectral range.

4. The light emitting assembly according to claim 1, wherein the first luminescent material is in contact with the first light source and the second luminescent material is in contact with the second light source.

5. The light emitting assembly according to claim 1, wherein a gap is present between the first light source and the first luminescent material and a gap is present between the second light source and the second luminescent material.

6. The light emitting assembly according to claim 1, wherein the first light source, the first luminescent material, the second light source and the second luminescent material are configured to prevent cross-illumination between the first light source and the second luminescent material and between the second light source and the first luminescent material.

7. The light emitting assembly according to claim 1, comprising more than one first light source and comprising more than one second light source.

8. The light emitting assembly according to claim 1, wherein at least one of the first light source and the second light source is a solid state light emitter.

9. The light emitting assembly according to claim 1, wherein at least one of the first luminescent material and the second luminescent material comprises an inorganic phosphor, an organic phosphor, quantum dots, quantum rods, or quantum tetrapods.

10. The light emitting assembly according to claim 1, comprising:

an ultraviolet filter configured to prevent the emission of light in the ultraviolet spectral range via the light exit window into the ambient.

11. The light emitting assembly according to claim 1 comprising a blue light absorption filter being arranged between the second luminescent material and the ambient to prevent leakage of light emitted by the second light source via the light exit window into the ambient.

12. A lamp comprising the light emitting assembly according to claim 1.

13. A luminaire comprising the light emitting assembly according to claim 1.

14. The light emitting assembly according to claim 6, further comprising one or more separation walls arranged to prevent the cross-illumination.

15. The light emitting assembly according to claim 6, further comprising a housing enclosing a space comprising different chambers separated from each other by walls for preventing the cross-illumination, each chamber comprising one light source and an opening at the light exit window, the opening being closed with a corresponding layer that comprises luminescent materials, chambers comprising the first light source having the corresponding layer of the specific chamber comprising the first luminescent material and chambers comprising the second light source having the corresponding layer of the specific other chamber comprising the second luminescent material.