US 2026/0206376 A1 · WHITE LED WITH AT LEAST P1F3 LIGHT QUALITY

Abstract

The invention provides a light generating system (1000) comprising a light generating device (100) and two or more luminescent materials (200), wherein: (A) the light generating device (100) is configured to generate device light (101) having a peak wavelength selected from the wavelength range of 440-465 nm; wherein the light generating device (100) comprises a solid state light source; (B) the two or more luminescent materials comprise (i) a first luminescent material (210) configured to convert at least part of the device light (101) into first luminescent material light (211) having spectral power within the green-yellow wavelength range, a full width half maximum of at least 50 nm, and a color point u′yellow, v′yellow; (ii) optionally a second luminescent material (220) configured to convert at least part of the device light (101) into second luminescent material light (221) having spectral power within the orange-red wavelength range, a full width half maximum of at least 50 nm, and a color point u′red, v′red; and (iii) a third luminescent material (230) configured to convert at least part of the device light (101) into third luminescent material light (231) within the orange-red wavelength range, wherein the third luminescent material (230) comprises M′xM2−2xAX6 doped with tetravalent manganese, wherein M′ comprises an alkaline earth cation, wherein M comprises a cation, and x is in the range of 0-1, wherein A comprises a tetravalent cation, wherein X comprises a monovalent anion, at least comprising fluorine; and (C) the light generating system (1000) is configured to generate system light (1001) comprising (i) at least part of the first device light (101), (ii) at least part of the first luminescent material light (211), and (iii) at least part of the third luminescent material light (231); wherein the system (1000) is configured such that the system light (1001) is white light having a correlated color temperature (CCT) selected from the range of 1800-6500 K, an Rf value of at least 85, a Rf,h1 value of at least 85, an Rg value of at least 95, and an Rcs,h1 value of at least −1%, wherein Rf, Rf,h1, Rg, and Rcs,h1 are defined according to TM-30 (2020) standard ANSI/IES TM-30-20: IES Method for Evaluating Light Source Color Rendition.

A light generating system comprising a light generating device and two or more luminescent materials, wherein:

the light generating device is configured to generate device light having a peak wavelength, PWL, selected from the wavelength range of 440-465 nm;
wherein the light generating device comprises a solid state light source;
the two or more luminescent materials comprise (i) a first luminescent material configured to convert at least part of the device light into first luminescent material light having spectral power within the green-yellow wavelength range, a full width half maximum of at least 50 nm, and a color point u′yellow, v′yellow, wherein the first luminescent material comprises a luminescent material of the type A3B5O12:Ce3+, wherein A comprises one or more of Y, La, Gd, Tb and Lu, and wherein B comprises one or more of Al, Ga, In and Sc;
(ii) optionally a second luminescent material configured to convert at least part of the device light into second luminescent material light having spectral power within the orange-red wavelength range, a full width half maximum of at least 50 nm, and a color point u′red, v′red, wherein the second luminescent material comprises one or more luminescent materials of the type MS:Eu2+, M2Si5N8:Eu2+, MAlSiN3:Eu2+ and Ca2AlSi3O2N5:Eu2+, wherein M comprises one or more of Ba, Sr and Ca;
and (iii) a third luminescent material configured to convert at least part of the device light into third luminescent material light within the orange-red wavelength range, wherein the third luminescent material comprises M′xM2−2xAX6 doped with tetravalent manganese, wherein M′ comprises an alkaline earth cation, wherein M comprises a cation, and x is in the range of 0-1, wherein A comprises a tetravalent cation, wherein X comprises a monovalent anion, at least comprising fluorine;
the first luminescent material having a color point selected from the ranges of 0.135≤u′≤0.200 and 0.555≤v′≤0.575;
the second luminescent material having a color point selected from the ranges of 0.33≤u′≤0.48 and 0.525≤v′≤0.555;
and the third luminescent material having a color point selected from the ranges of 0.52≤u′≤0.54 and 0.51≤v′≤0.53;
the light generating system is configured to generate system light comprising (i) at least part of the device light (101), (ii) at least part of the first luminescent material light, and (iii) at least part of the third luminescent material light;
wherein the system is configured such that the system light is white light having a correlated color temperature (CCT) selected from the range of 1800-6500 K, an Rf value of at least 85, an Rf,h1 value of at least 85, an Rg value of at least 95, and an Rcs,h1 value of at least −1%, wherein Rf, Rf,h1, Rg, and Rcs,h1 are defined according to TM-30 (2020) standard ANSI/IES TM-30-20:
IES Method for Evaluating Light Source Color Rendition, wherein a contribution to a spectral power distribution of the system light in the wavelength range of 380-780 nm by the third luminescent material light is defined as a fraction G, and wherein the following applies:
(a) when the system light comprises the second luminescent material light, the fraction G is selected from the range of 0.95*G′-1.05*G′, wherein G′ complies with the following formula:
G
′
=
1.4421
-
2.904125
*
10
-
8
*
PWL
-
10.08921
*
u
Yellow
′
-
0.5457286
*
u
R
⁢
e
⁢
d
′
-
1.074782
*
10
-
4
*
CCT
+
21.623
*
[
u
Yellow
′
]
2
-
1.639
*
[
u
R
⁢
e
⁢
d
′
]
2
+
4
.
9
⁢
21703
*
10
-
9
*
[
CCT
]
2
+
2
.
3
⁢
16461
*
10
-
7
*
[
PWL
*
u
R
⁢
e
⁢
d
′
]
+
7.268292
*
[
u
Yellow
′
*
u
R
⁢
e
⁢
d
′
]
+
9
.
3
⁢
09924
*
10
-
5
*
[
u
Red
′
*
CCT
]
and wherein the fraction G is at least 0.05 and at maximum 0.2;
or
(b) when the system light does not comprise the second luminescent material light, the following applies:
u′Yellow≥0.95*(0.2546−0.000016*CCT), and the fraction G is at least 0.05 and at maximum 0.2.

142 more elements

White led with at least p1f3 light quality

Life of this patent

White led with at least p1f3 light quality

Life of this patent

Abstract

Claims15