Meat lighting system with improved efficiency and red oversaturation

Patent metadata

Field	Value
Publication number	US-10439110-B2
Application number	US-201615753658-A
Country	US
Kind code	B2
Filing date	Aug 16, 2016
Priority date	Sep 1, 2015
Publication date	Oct 8, 2019
Grant date	Oct 8, 2019

Abstract

The invention provides a lighting system (100), configured to provide lighting system light (101), the lighting system comprising: —a light source (10) configured to provide light source light (11) with light intensity in the blue spectral region; —a first luminescent material (210) configured to convert at least part of the light source light (11) into first luminescent material light (211) with light intensity in the green spectral region and having a full width half maximum (FWHM) of at least 90 nm; —a second luminescent material (220) configured to convert (i) at least part of the light source light (11), or (ii) at least part of the light source light (11) and at least part of the first luminescent material light (211) into second luminescent material light (221) with light intensity in the spectral region of 610-680 nm; wherein the lighting system (100) is configured to provide at a first setting of the lighting system (100) lighting system light (101) comprising said light source light (11), said first luminescent material light (211) and said second luminescent material light (221) having a color point (x; y) with x=0.38±0.1 and with y=0.28±0.1.

First claim

The invention claimed is:

1. A lighting system, configured to provide lighting system light, the lighting system comprising:
a light source configured to provide light source light with light intensity in the blue spectral region;
a first luminescent material configured to convert at least part of the light source light into first luminescent material light with light intensity in the green spectral region and having a full width half maximum of at least 90 nm;
a second luminescent material configured to convert (i) at least part of the light source light, or (ii) at least part of the light source light and at least part of the first luminescent material light into second luminescent material light with light intensity in the spectral region of 610-680 nm, wherein the second luminescent material under excitation with at least part of the light source light, or at least part of the light source light and at least part of the first luminescent material light shows one or more emission lines having a full width half maximum (FWHM) at RT of 40 nm or less;
wherein the lighting system is configured to provide at a first setting of the lighting system lighting system light comprising said light source light, said first luminescent material light and said second luminescent material light having a color point (x;y) with x=0.38±0.1 and with y=0.3±0.1; and
wherein the first luminescent material under excitation with at least part of the light source light, or at least part of the light source light and at least part of the first luminescent material light has at least 65% of the total power in the visible wavelength range of the first luminescent material light in the range of 480-580 nm.

2. The lighting system according to claim 1 , wherein the first luminescent material comprises M 3 A 5 O 12 :Ce 3+ , wherein M is selected from the group consisting of Sc, Y, Tb, Gd, and Lu, and wherein A is selected from the group consisting of Al, Ga, Sc and In.

3. The lighting system according to claim 2 , wherein the first luminescent material comprises one or more of Lu 3 Al 5 O 12 :Ce 3+ and Y 3 Ga 5 O 12 :Ce 3+ .

4. The lighting system according to claim 2 , wherein the first luminescent material light has a full width half maximum (FWHM) of at least 100 nm.

5. The lighting system according to claim 1 , wherein the second luminescent material under excitation with at least part of the light source light, or at least part of the light source light and at least part of the first luminescent material light has at least 40% of the total power in the visible wavelength range of the second luminescent material light in the range of 620-680 nm.

6. The lighting system according to claim 1 , wherein the first luminescent material has a dominant wavelength in the range of 540-575 nm, wherein the lighting system is configured to provide at the first setting of the lighting system lighting system light comprising said light source light, said first luminescent material light and said second luminescent material light having a color point (x;y) with x=0.38±0.02 and with y=0.3±0.02.

7. The lighting system according to claim 1 , wherein the second luminescent material comprises M 2 AX 6 doped with tetravalent manganese, wherein M comprises an alkaline cation, wherein A comprises a tetravalent cation, and wherein X comprises a monovalent anion, at least comprising fluorine.

8. The lighting system according to claim 7 , wherein M comprises at least one or more of K and Rb, wherein A comprises one or more of Si and Ti, and wherein X=F.

9. The lighting system according to claim 1 , comprising a plurality of light sources, wherein a first light source is radiationally coupled to the first luminescent material, wherein a second light source is radiationally coupled to the second luminescent material, wherein the lighting system further comprises a control system configured to control the first light source and the second light source.

10. The lighting system according to claim 1 , without including an optical filter configured downstream from the luminescent materials with the optical filter being configured to reduce along an optical axis of the optical filter one or more of the ratio's (i) yellow light to green light, and (ii) yellow light to red light.

11. A show case comprising the lighting system according to claim 1 .

12. Use of the lighting system according to claim 1 , for illuminating a product having a red color.

13. Use according to claim 12 , for illuminating meat.

Assignees

• Signify Holding Bv

Inventors

• Peeters Martinus Petrus Joseph
• Broersma Rémy Cyrille
• Hendriks René Jan

Classifications

• F21V9/40

  with provision for controlling spectral properties, e.g. colour, or intensity · CPC title

• H10W90/00

  Package configurations · CPC title

• F21V9/38

  Combination of two or more photoluminescent elements of different materials · CPC title

• F21Y2115/10

  Light-emitting diodes [LED] · CPC title

• F21K9/64

  using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer · CPC title