White-light LED module and indirect lighting
Patent Information
- Application Number
- EP2024702489
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2023-02-07
- Filing Date
- 2024-01-24
- Publication Date
- 2025-10-15
AI Technical Summary
Existing white light LED modules fail to produce light with a high color temperature similar to natural daylight while avoiding strong blue or violet intensity peaks, which are essential for non-visual effects and melanopic efficacy.
A white light LED module with a blue-stimulating LED chip and color conversion materials, such as blue-emitting phosphors, generates light with a color temperature between 9,000 K and 20,000 K, a color rendering index (CRI) of 90 or higher, and a melanopic daylight efficiency factor between 1.3 and 1.5, while reducing intensity below 420 nm and increasing it above 450 nm, mimicking natural daylight's spectral distribution.
The solution produces white light with enhanced melanopic effectiveness and color rendering, similar to daylight with a higher color temperature, suitable for indoor lighting applications, combining indirect bluish lighting with direct warmer lighting.
Smart Images
Figure EP2024051594_15082024_PF_FP
Abstract
Description
[0001] White light LED module and indirect lighting description:
[0002] The present invention relates to a white light LED module as well as a luminaire and an indirect lighting system comprising such a module.
[0003] White-light LED modules with a blue-stimulating LED and one or more color conversion materials are already known from the prior art. This produces a white mixed light with a color temperature of, for example, between 4,000 K and 6,500 K. Its spectral distribution, particularly in the lower wavelength range within the visible spectrum, exhibits spectral components (intensities) that actually correspond to a CIE daylight spectrum with a significantly higher color temperature. This increased blue component is desirable for certain non-visual effects.
[0004] The present invention now aims to provide a white light LED module that generates white light with a higher color temperature (for example, over 8,000 K or even 9,000 K), which in natural daylight corresponds to illumination with (azure or pastel) blue zenith light.
[0005] Natural daylight (skylight) exhibits a favorable melanopic effect factor, which the white-light LED module should also achieve. At the same time, strong, concentrated blue or violet intensity peaks should be avoided compared to daylight. At the same time, however, the violet component, for example, must not be omitted, as it is known to stimulate human neuropsin.
[0006] These problems are at least reduced by a white light LED module according to the present invention.
[0007] In Science & Research Light 712020 (https: / / lichtnet.de / artikel / weisses-led-licht / ) the metric of melanopic efficacy is explained.
[0008] In the German DIN standardization area, DIN / TS 5031-100 - 2021-11 [3] was published in 2021, which describes the melanopically evaluated radiation quantities and the melanopic light effect. A white light LED module has:
[0009] At least one LED chip with a peak wavelength in the range of 41nm to 450nm, preferably from 415nm to 440nm, particularly preferably 418nm to 438nm, wherein preferably no further LED chip with a peak wavelength outside this range is present,
[0010] At least one color conversion material, wherein the mixture of the light emitted by the LED chip with the light of the color conversion material (preferably bluish) results in white light with the following properties:
[0011] Color temperature between 9000 and 20,000K, preferably 11,000K to 16,000K
[0012] Color rendering index CRI greater than or equal to 90,
[0013] Wherein the intensity of the spectrum of the mixed light in the range between 4oonm and 42onm at each wavelength is at least 60%, preferably 80% below the value of the intensity of the corresponding wavelength of a daylight CRI spectrum of the same color temperature and the same lumen value.
[0014] The intensity of the spectrum of the mixed light is preferably in the range between 48nm and δ35nm, more preferably between 500nm and δ35nm, at each wavelength in a range +- 20%, preferably 15% around the value of the intensity of the corresponding wavelength of a daylight CRI spectrum of the same color temperature and the same lumen value.
[0015] The intensity of the spectrum of the mixed light is preferably in the range between 450nm and 50nm at each wavelength above the value of the intensity of the corresponding wavelength of a daylight CRI spectrum of the same color temperature and the same lumen value.
[0016] A white light LED module can have:
[0017] At least one LED chip with a peak wavelength in the range of 41nm to 450nm, preferably 415nm to 440nm, more preferably 418nm to 438nm, wherein preferably no further LED chip with a peak wavelength outside this range is present,
[0018] At least one color conversion material, wherein the mixture of the light emitted by the LED chip with the light of the color conversion material (preferably bluish) results in white light with the following properties:
[0019] Color temperature between 9000 and 20,000K, preferably 11,000K to 16,000K,
[0020] Color rendering index CRI greater than or equal to 90, wherein the integrated intensity of the spectrum of the mixed light in the range between 400nm and 42onm is at least 60%, preferably 80% below the integrated value of the intensity of a daylight CRI spectrum of the same color temperature and the same lumen value.
[0021] The integrated intensity of the spectrum of the mixed light can be in the range between 48nm and δ35nm, preferably 500nm and δ35nm at each wavelength in a range +- 20%, preferably +-15% around the value of the integrated intensity of a daylight CRI spectrum of the same color temperature and the same lumen value.
[0022] The integrated intensity of the spectrum of the mixed light can be in the range between 450nm and 50nm above the value of the integrated intensity of a daylight CRI spectrum of the same color temperature and the same lumen value.
[0023] The color conversion material can contain a blue-emitting phosphor, for example Eu 2+ doped barium chlorophosphate.
[0024] The color conversion material can contain a blue-emitting phosphor, for example Eu 2+ doped apatite e.g. M5(PO4)3Cl:Eu 2+ (M=Ca,Sr,Ba) or Ca2+xLa8-x(Si04)6-x(P04) x 02:yEu 2+ (x = 0-6 e.g. o, 2, 4 and 6) and y=o.oi-o.2) or Eu 2+ doped barium-magnesium aluminate e.g. BaM-gAl lo Oi7:Eu 2+ (BAM).
[0025] The mixed light preferably has an R9 value above 50.
[0026] The color conversion material can also have a green (e.g. LuAG, Ba2SiO4:Eu 2+ ), a yellow (e.g. YAG, (Ba,Sr)2SiO4:Eu 2+ ) and / or a red-emitting phosphor (e.g. a nitride (SCASN) CaAlSiN3:Eu 2+ or SrAlSiN3:Eu 2+ or (Sr,Ca)AlSiN3:Eu 2+; or a fluorosilicate such as K2SiF6:Mn4+ (KSF).
[0027] The color conversion material can be a cyan-emitting phosphor such as a garnet, e.g. Ca2LuHf2Al3Oi2:o.O2Ce 3+ or Ca2LuZr2Al3Oi2:o.oiCe 3+ The cyan-emitting phosphors increase the CRI of the white-emitting LEDs because they fill the gap in the spectrum between the blue and green wavelength regions.
[0028] The color conversion material can be a garnet phosphor e.g. YAG and / or LuAG and / or an apatite e.g. Ca6La4(SiO4)2(PO4)4O2:o.oiEu 2+ and / or an ortho-silicate e.g. (Ba,Sr)2SiO4:Eu 2+ and / or e.g. a nitride (SCASN) CaAlSiN3:Eu 2+ or (Sr,Ca)AlSiN3:Eu 2+and / or a fluorosilicate such as K2SiF6:Mn4+ (KSF). The mixed light can have a melanopic daylight efficiency factor Ymei,v,D65 according to DIN / TS 5031-100 - 2021-11 or the MDER defined in CIE 8026:2018 between 1.3 and 1.5, preferably between 1.35 and 1.45.
[0029] Another aspect concerns indirect lighting with an LED module of the type described above.
[0030] A further aspect relates to a luminaire having direct lighting and such indirect lighting.
[0031] The direct lighting may be white and have a color temperature below 8000K, preferably below 6500K, more preferably below 5000K, even more preferably below 3500K.
[0032] A further aspect of the invention relates to an indoor luminaire or interior lighting, comprising a (preferably bluish) white indirect lighting with:
[0033] - a color temperature between 9000 and 20,000K, preferably 9000 to 16,000K, and a color rendering index CRI greater than or equal to 90, further comprising a white direct illumination with a color temperature below 8000K, preferably below 6500K, more preferably below 5000K, even more preferably below 3500K.
[0034] Fig. 1 to 4 show different spectra of white light LED modules according to the invention.
[0035] The spectra of Fig. 1 to Fig. 4 are generated by a white light LED module according to the invention, which has at least one exciting LED chip with a peak wavelength in the range of 41nm to 450nm, preferably from 415nm to 440nm, particularly preferably 418nm to 438nm. The presence of another exciting LED chip with a peak wavelength outside this range is not necessary, and thus preferably no other such LED chip is present.
[0036] The white mixed light of the LED module is a combination of such an exciting LED chip with light emitted by at least one color conversion material. The color conversion material comprises at least one blue-emitting phosphor, which, for example, comprises or consists solely of Eu2+-doped apatite (e.g., Ca2+xLa8x(SiO4)6x(PO4)xO2:Eu2+ (x = 0, 2, 4, or 6). Furthermore, at least one of a green, a yellow, and / or a red-emitting phosphor may be present. For example, a cyan-emitting phosphor may also be present in addition to the blue-emitting phosphor.
[0037] Figure 1 shows the spectrum of a white-light LED module according to the invention with a color temperature of 15,000 K. For comparison, the CIE daylight spectrum at 30,000 K is shown in dotted lines. Furthermore, the CIE daylight spectrum at 15,000 K is shown, as well as the difference between the spectrum according to the invention (15,000 K) and this CIE daylight spectrum of 15,000 K.
[0038] As is readily apparent, advantageously the proportion of emitted intensity below 400 nm and 420 nm is greatly reduced compared to the CIE daylight spectrum 15,000 K. This reduction is at least 60%, preferably 80%, more preferably at least 90% below the value of the intensity of the corresponding wavelength of a daylight CIE spectrum as defined in the Technical Report CIE 204:2013 of the same color temperature (and the same lumen value) for each wavelength in this range 400 nm to 420 nm.
[0039] The color rendering index CRI of this inventive spectrum 15,000 K is higher than 90.
[0040] Advantageously, the intensity of the spectrum shown in Fig. 1 is increased at each wavelength between 450 nm and 510 nm relative to the intensity of the corresponding wavelength of the daylight CRI spectrum with the same color temperature (15,000 K) and the same lumen value. This increase can be at least 5%, preferably 15%, more preferably at least 20%.
[0041] As can also be seen, the intensity of the spectrum of the inventive white light LED module of Fig. 1 in the range between 500 nm and 640 nm is close to the intensity value of the corresponding wavelength of the daylight CRI spectrum at the same color temperature (here 15,000 K) and the same lumen value. The green-yellow range between 520 and 570 nm was also reduced by up to a maximum of 15%, and the orange-red range between 570 and 0.35 nm was increased by up to 15%.
[0042] The spectrum shown in Fig. 1 advantageously has an R9 value above 50. Advantageously, the mixed light shown in Fig. 1 has a melanopic daylight efficiency factor between 1.3 and 1.5, preferably between 1.35 and 1.45, particularly preferably of about 1.4.
[0043] The other spectra shown in Fig. 2 to 4, which were generated with slightly varying color conversion material, also exhibit the spectrum properties described in connection with Fig. 1.
[0044] According to the invention, for example, one or more violet-emitting LED chips with a peak wavelength of 418 to 438 nm can be used for excitation and as a portion of the white mixed light.
[0045] In the examples shown, the spectrum has a CCT value of approximately 15,000 K, a CRI value above 90 and an R9 value above 50.
[0046] The melanopic daylight efficiency factor is approximately 1.4. The lumen efficiency of the emission is approximately 243 lumens / WRad. At the same time, the 1931 2 0 Observers defined x,y chromaticity coordinates of the white mixed light only slightly above the Planck curve with a D u'v' value of approximately +0.004.
[0047] With regard to a melanopic-photopic combined weighting (mathematically folded melanopic and photopic sensitivity), the white light spectrum of the white light LED module according to the invention resembles a daylight spectrum with a much higher color temperature, such as a 30,000 K CIE daylight.
[0048] The small violet peak between 415 and 440 nm has a comparable intensity (integrated power over the wavelength range) to a 15,000 K CIE daylight spectrum, at the same lumen value.
[0049] The azure blue region within the wavelength range of approximately 450 to 510 nm is increased in intensity above the comparable daylight value, so that the absolute non-visual effectiveness is increased at the much lower light intensities typically found indoors and is therefore more comparable to blue daylight with a higher color temperature.
[0050] A preferred application of the white-light LED module according to the invention is in the field of indoor indirect lighting. Such indirect lighting is then preferably combined with direct lighting of warmer light, i.e., with a lower color temperature.
[0051] The luminaire can be, for example, a hanging or pendant light, a floor lamp, or a table lamp. Furthermore, the white light LED module according to the invention can be used as backlighting or backlighting for larger ceiling lights.
Claims
Claims:
1. White light LED module, comprising: At least one LED chip with a peak wavelength in the range of 41nm to 450nm, preferably from 415nm to 440nm, particularly preferably 418nm to 438nm, wherein preferably no further LED chip with a peak wavelength outside this range is present, At least one color conversion material, wherein the mixture of the light emitted by the LED chip with the light of the color conversion material results in white light having the following properties: Color temperature between 9000 and 20,000K, preferably 11,000K to 16,000K Color rendering index CRI greater than or equal to 90, Wherein the intensity of the spectrum of the mixed light in the range between 4oonm and 42onm at each wavelength is at least 60%, preferably 80% below the value of the intensity of the corresponding wavelength of a daylight CRI spectrum of the same color temperature and the same lumen value.
2. LED module according to claim 1, wherein the intensity of the spectrum of the mixed light in the range between 48nm and δ35nm, preferably 500nm and δ35nm, at each wavelength in a range +- 20%, preferably +- 15% around the value of the intensity of the corresponding wavelength of a daylight CRI spectrum of the same color temperature and the same lumen value.
3. LED module according to one of the preceding claims, wherein the intensity of the spectrum of the mixed light in the range between 450nm and 50nm at each wavelength is above the value of the intensity of the corresponding wavelength of a daylight CRI spectrum of the same color temperature and the same lumen value.
4. White light LED module, comprising: At least one LED chip with a peak wavelength in the range of 41nm to 450nm, preferably from 415nm to 440nm, particularly preferably 418nm to 438nm, wherein preferably no further LED chip with a peak wavelength outside this range is present, - At least one color conversion material, wherein the mixture of the light emitted by the LED chip with the light of the color conversion material results in white light having the following properties: Color temperature between 9000 and 20,000K, preferably 11,000K to 16,000K Color rendering index CRI greater than or equal to 90, Wherein the integrated intensity of the spectrum of the mixed light in the range between 400nm and 42onm is at least 60%, preferably 80% below the integrated value of the intensity of a daylight CRI spectrum of the same color temperature and the same lumen value.
5. LED module according to claim 4, wherein the integrated intensity of the spectrum of the mixed light in the range between 48nm and δ35nm, preferably 500nm and δ35nm, at each wavelength in a range +- 20%, preferably +- 15% around the value of the integrated intensity of a daylight CRI spectrum of the same color temperature and the same lumen value.
6. LED module according to one of claims 4 or 5, wherein the integrated intensity of the spectrum of the mixed light in the range between 450nm and 50nm is above the value of the integrated intensity of a daylight CRI spectrum of the same color temperature and the same lumen value.
7. LED module according to one of the preceding claims, wherein the color conversion material comprises a blue-emitting phosphor, preferably comprising EU2+ doped barium chlorophosphate.
8. LED module according to one of the preceding claims, wherein the color conversion material comprises a blue-emitting phosphor having an Eu 2+ doped apatite, preferably M5(PO4)3Cl:Eu 2+ (M=Ca,Sr,Ba) or Ca2+xLa8-x(SiO4)6-x(PO4) x O2:yEu 2+ (x = 0-6 e.g. o, 2, 4 and 6, and y=o.oi-o.2); or Eu 2+ doped barium-magnesium aluminate, preferably BaM-gAl lo Oi7:Eu 2+ has.
9. LED module according to one of the preceding claims, wherein the color conversion material has a green (eg LuAG, Ba2SiO4:Eu 2+ ), a yellow (e.g. YAG, (Ba,Sr)2SiO4:Eu 2+ ) and / or a red-emitting phosphor (e.g. a nitride (SCASN) CaAlSiN3:Eu 2+ or SrAlSiN3:Eu 2+ or (Sr,Ca)AlSiN3:Eu 2+ or a fluorosilicate such as K2SiF6:Mn 4+ (KSF).
10. LED module according to one of the preceding claims, wherein the color conversion material is a cyan-emitting phosphor such as a garnet, e.g. Ca2LuHf2Al3Oi2:o.O2Ce3 + or Ca2LuZr2Al3Oi2:o.oiCe3 + has.
11. LED module according to one of the preceding claims, wherein the color conversion material is a garnet phosphor, eg YAG and / or LuAG and / or an apatite, eg Ca6La4(SiO4)2(PO4)4O2:o.oiEu 2+ or M5(PO4)3Cl:Eu 2+ (M=Ca,Sr,Ba) and / or an ortho-silicate e.g. (Ba,Sr)2SiO4:Eu 2+and / or e.g. a nitride (SCASN) CaAl-SiN3:Eu 2+ or (Sr,Ca)AlSiN3:Eu 2+ and / or a fluorosilicate such as K2SiF6:Mn« + (KSF).
12. LED module according to one of the preceding claims, wherein the mixed light has an R9 value above 50.
13. LED module, wherein the mixed light has a melanopic daylight efficiency factor Ymei,v,D65 according to DIN / TS 5031-100 - 2021-11 or the MDER defined in CIE 8026:2018 between 1.3 and 1.5, preferably between 1.35 and 1.
45.
14. Indirect lighting comprising an LED module according to one of the preceding claims.
15. Luminaire comprising direct lighting and indirect lighting according to claim 14.
16. Luminaire according to claim 15, wherein the direct illumination is white light and has a color temperature below 8000K, preferably below 6500K, more preferably below 5000K, even more preferably below 3500K.
17. Indoor luminaire, comprising a white indirect lighting, for example an indirect lighting according to claim 14, with: - a color temperature between 9000 and 20,000K, preferably 9000 to 16,000K, and a color rendering index CRI greater than or equal to 90, further comprising a white direct illumination with a color temperature below 8000K, preferably below 6500K, more preferably below 5000K, even more preferably below 3500K.