WO2023232670A1 - Filament à del comprenant des del agencées pour émettre une lumière uv - Google Patents

Filament à del comprenant des del agencées pour émettre une lumière uv Download PDF

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Publication number
WO2023232670A1
WO2023232670A1 PCT/EP2023/064168 EP2023064168W WO2023232670A1 WO 2023232670 A1 WO2023232670 A1 WO 2023232670A1 EP 2023064168 W EP2023064168 W EP 2023064168W WO 2023232670 A1 WO2023232670 A1 WO 2023232670A1
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WO
WIPO (PCT)
Prior art keywords
leds
led filament
linear arrays
light
linear
Prior art date
Application number
PCT/EP2023/064168
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English (en)
Inventor
Ties Van Bommel
Original Assignee
Signify Holding B.V.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Signify Holding B.V. filed Critical Signify Holding B.V.
Publication of WO2023232670A1 publication Critical patent/WO2023232670A1/fr

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L9/00—Disinfection, sterilisation or deodorisation of air
    • A61L9/16—Disinfection, sterilisation or deodorisation of air using physical phenomena
    • A61L9/18—Radiation
    • A61L9/20—Ultraviolet radiation

Definitions

  • LED light emitting diodes
  • LEDs provide numerous advantages such as a longer operational life, a reduced power consumption, and an increased efficiency related to the ratio between light energy and heat energy.
  • LED filament lamps are highly appreciated as they are very decorative.
  • LEDs Due to the advantageous aspects of the use of LEDs, the interest has rapidly increased to replace conventional light sources with LEDs in many lighting arrangements. It will be appreciated that this replacement, also called retrofitting, is appreciated and desired by users who wish to have the look of an incandescent bulb.
  • the light source replacement is often performed by removing the conventional light source(s) from the luminaire (e.g. a lamp holder) of the lighting arrangement and attaching the LEDs, LED arrangement(s) or LED device(s) into the luminaire.
  • the luminaire e.g. a lamp holder
  • UVA 315-400 nm
  • violet light 400-420 nm
  • UV LED-filaments may hereby constitute important candidates for this replacement.
  • existing arrangements comprising LEDs arranged to emit UV light may suffer from complexity and/or operational issues regarding current/voltage driving characteristics, efficiency characteristics and/or electrical contact architectures.
  • LED filaments with respect to aesthetics and light distribution purposes with the advantageous properties of providing disinfection (bactericidal and/or viricidal) lighting, whilst providing a non-complex and/or conveniently operated LED filament.
  • a light emitting diode, LED, filament configured to emit LED filament light.
  • the LED filament comprises a carrier, and a set of linear arrays of a plurality of light emitting diodes, LEDs, arranged on the carrier.
  • the set of linear arrays comprises, at least, a first linear array of a plurality of first LEDs, wherein the first LEDs are arranged to emit first ultraviolet, UV, light in a wavelength range of 100-380 nm, and a second linear array of a plurality of second LEDs, wherein the second LEDs are arranged to emit second UV light in a second wavelength range of 100-380 nm.
  • the first UV light has a first centroid wavelength, Xcl
  • the second UV light has a second centroid wavelength, Xc2, wherein Xcl+30 nm ⁇ Xc2.
  • the LEDs are arranged on an elongated carrier like for instance a substrate, that may be rigid (made from e.g. a polymer, glass, quartz, metal or sapphire) or flexible (e.g. made of a polymer or metal, e.g. a film or (polyimide) foil).
  • the carrier comprises a first major surface and an opposite second major surface
  • the plurality of LEDs is arranged on at least one of these surfaces.
  • the carrier may be reflective or light transmissive, such as translucent and preferably transparent.
  • the linear arrays are arranged on the same major surface of the carrier.
  • the present invention is based on the idea of providing a LED filament comprising a plurality of linear arrays of LEDs which are configured to emit different types of UV light, wherein the centroid (peak dominant) wavelength differs between the emitted UV lights.
  • a LED filament which is able to efficiently provide a disinfection lighting whilst being decorative and aesthetically pleasing, wherein the LED filament furthermore is convenient in its architecture.
  • the present invention is advantageous in that the linear arrays of the plurality of LEDs of the LED filament allow for a non-complex and convenient electric circuitry. In turn, this increases the service life of the LED filament and/or reduces the risk of malfunction thereof at operation.
  • the present invention is further advantageous in that substantially different UV wavelength are used. It is based on the insight that a higher disinfection performance is achieved because different bacteria and/or viruses have different absorption maxima. In addition, different wavelengths may use different mechanisms of inactivating bacterial and/or viruses e.g. destroying the proteins or DNA/RNA in a virus.
  • the present invention is further advantageous in that the number of LEDs may be smaller than LED filaments using LEDs arranged to emit white light. This is based on the fact that UV light is invisible, and the gap/distance between UV LEDs may be relatively large, which is not suitable for LED filaments with LEDs arranged to emit white light. As a consequence, the present UV LED filaments may be more made more cost-efficient and/or be less prone to malfunction.
  • the LED filament of the present invention furthermore comprises relatively few components.
  • the relatively low number of components is advantageous in that the LED filament is relatively inexpensive to fabricate.
  • the relatively low number of components of the LED filament implies an easier recycling, especially compared to devices or arrangements comprising a relatively high number of components which impede an easy disassembling and/or recycling operation.
  • the LED filament which is configured to emit LED filament light, comprises a carrier.
  • carrier it is here meant an element, substrate, or the like, arranged to mechanically and/or electrically support LEDs.
  • the plurality of LEDs may be arranged, mounted and/or mechanically coupled on/to the carrier (e.g. a substrate), wherein the carrier is configured to mechanically and/or electrically support the LEDs.
  • the carrier may be light transmissive and/or reflective.
  • the carrier may furthermore be elongated in order to support the arrays of LEDs of the (elongated) LED filament.
  • the LED filament comprises a set of linear arrays of a plurality of LEDs arranged on the carrier.
  • the LED filament comprises a plurality of linear arrays, wherein each linear array of the set comprises a (respective) plurality of LEDs.
  • the set of linear arrays comprises a first linear array of a plurality of first LEDs, wherein the first LEDs are arranged to emit first ultraviolet, UV, light in a wavelength range of 100-380 nm.
  • the set of linear arrays further comprises a second linear array of a plurality of second LEDs, wherein the second LEDs are arranged to emit second UV light in a second wavelength range of 100-380 nm.
  • the first UV light has a first centroid wavelength, Xcl
  • the second UV light has a second centroid wavelength, Xc2.
  • centroid wavelength it is here meant a (dominant) peak wavelength, i.e. a wavelength at which the UV light reaches a maximum intensity.
  • the relation between the first centroid wavelength, kc l , and the second centroid wavelength, Zc2, is kcl+30 nm ⁇ Zc2. Hence, there is an offset between the first and second UV lights by at least 30 nm.
  • the plurality of first LEDs of the first linear array may be electrically connected in series (i.e. in a serial circuitry) and/or the plurality of second LEDs of the first linear array may be electrically connected in series (i.e. in a serial circuitry).
  • the first linear array and the second linear array may be electrically connected in parallel.
  • the set of linear arrays further comprises a third linear array of a plurality of third LEDs.
  • the third LEDs are arranged to emit third light, comprising at least one of UV light and violet light, in a third wavelength range of 100-420 nm, wherein the third light has a third centroid wavelength, Xc3, wherein kcl+30 nm ⁇ Zc2 ⁇ Zc3-30 nm.
  • the third light may be violet light (i.e. in a wavelength range of 380 - 420 nm).
  • one of the first centroid wavelength, kcl, and the second centroid wavelength, Zc2, being in a UVC wavelength range of 100-280 nm, and the second centroid wavelength, Zc2, and the third centroid wavelength, Xc3, being in a UVA wavelength range of 315-380 nm, may be fulfilled.
  • the present embodiment is particularly advantageous as UVC light is the most effective wavelength for disinfection purposes, e.g. inactivating viruses. This usage of UVC light in the LED filament of the present invention can therefore effectively prevent the spread of viruses.
  • one of the first centroid wavelength, Xcl, and the second centroid wavelength, Xc2 may be in a far-UVC wavelength range of 190-230 nm.
  • Far-UVC light is less harmful than UVC light with a longer wavelength.
  • the present embodiment is further advantageous in that the UVA wavelength range is also effective for disinfection purposes, e.g. for inactivating/killing bacteria.
  • the linear arrays of the set of linear arrays may be arranged in parallel on the carrier.
  • At least one respective LED of at least two linear arrays of the set of linear arrays may be aligned in a direction, B, perpendicular to a respective principal axis, A, of the respective linear array.
  • respective LEDs of the two or more linear arrays may be aligned in the direction, B.
  • (all) LEDs may be symmetrically arranged and aligned in the direction, B.
  • At least one respective LED of at least two linear arrays of the set of linear arrays may be arranged offset with respect to a respective principal axis, A, of the respective linear array.
  • respective LEDs of the two or more linear arrays may be arranged offset with respect to the principal axis, A, such that the LEDs are not aligned in the direction, B.
  • a distance, D, in a direction, B, perpendicular to a respective principal axis, A, of the respective linear array, and between adjacently arranged linear arrays of the set of linear arrays may be the same.
  • the linear arrays may be separated equidistantly by the distance, D.
  • the present embodiment is advantageous in that the symmetric arrangement of the set of linear arrays may contribute to the aesthetical appearance of the LED filament and/or further improve the light emitting effects thereof.
  • a respective distance in a direction, B, perpendicular to a respective principal axis, A, of the respective linear array, and between linear arrays of at least two pairs of adjacently arranged linear arrays of the set of linear arrays, may be different.
  • At least two linear arrays of the set of linear arrays may have a different number of LEDs, per unit length, L, of the respective linear array.
  • the difference in the number of LEDs may be, e.g., one, two or three LEDs.
  • the linear array of the at least two linear arrays with the lowest number of LEDs may comprise at least one resistor arranged in series with the LEDs of said linear array.
  • At least one property of the LEDs of the at least two linear arrays of the set of linear arrays is configured such that a respective forward voltage to each of the at least two linear arrays of the set of linear arrays is the same.
  • at least one property of the LEDs it is here meant substantially any property of the LEDs such as the power (consumption) of the LEDs, the number of the LEDs, etc.
  • the two linear arrays of the set of linear arrays of LEDs are constructed such that a respective forward voltage to the linear arrays is the same, or at least approximately the same.
  • the LED filament may comprise a first electrode and a second electrode, wherein the plurality of first LEDs of the first linear array is arranged in series, wherein the plurality of second LEDs of the second linear array is arranged in series, and wherein the linear arrays of the set of linear arrays are arranged between the first and second electrodes.
  • the LED filament may comprise a common first electrode and a common second electrode for (all of) the linear arrays of the set of linear arrays.
  • the present embodiment is advantageous in that the circuitry of the LED filament becomes less complex.
  • the LED filament may further comprise a translucent encapsulant comprising at least one of a luminescent material and a light scattering material, wherein the encapsulant at least partially encloses the set of linear arrays and the carrier.
  • a translucent encapsulant comprising at least one of a luminescent material and a light scattering material, wherein the encapsulant at least partially encloses the set of linear arrays and the carrier.
  • encapsulant it is here meant a material, element, arrangement, or the like, which is configured or arranged to at least partially surround, encapsulate and/or enclose the set of linear arrays and the carrier.
  • the encapsulant is translucent, i.e. it comprises a translucent material.
  • translucent material it is here meant a material, composition and/or substance which is translucent and/or transparent.
  • the encapsulant further comprises a luminescent material configured to scatter light emitted from the LEDs.
  • a LED filament arrangement comprises at least one LED filament according to any one of the preceding embodiments.
  • the LED filament arrangement further comprises a controller coupled to the set of linear arrays, wherein the controller is configured to individually control the operation of the respective linear array of the set of linear arrays.
  • the LED filament arrangement further comprises at least one of a user interface coupled to the controller, wherein the controller is configured to be controlled by an operator via the user interface, and a sensor coupled to the controller, wherein the sensor is configured to register sensor data and wherein the controller is configured to individually control the operation of the respective linear array of the set of linear arrays based on the sensor data.
  • the present embodiment is advantageous in that the individual control of the linear array(s) as provided by the controller may even further improve the aesthetics and/or light distribution purposes with the advantageous properties of disinfection (bactericidal and/or viricidal) lighting.
  • the LEDs of the first linear array may be configured to emit UVC light which is particularly effective for disinfection purposes, and the controller may hereby be configured to control one or more properties (e.g. intensity) of the LEDs of the first linear array.
  • a luminaire may comprise one or more LED filaments according to any of the preceding embodiments or a LED filament arrangement according to the preceding embodiment.
  • the luminaire further comprises a light-transmissive cover at least partially enclosing the LED filament(s), and an electrical connection connected to the LED filament(s) for a supply of power to the plurality of LEDs of the LED filament(s).
  • cover it is here meant an enclosing element, such as a cap, cover, envelope, or the like, comprising an at least partial translucent and/or transparent material.
  • the LED filament (or LED filament arrangement) according to the invention may be conveniently arranged in substantially any luminaire, lamp or LED lighting device, such as a LED filament lamp or a LED filament luminaire, luminaire, lighting system, or the like.
  • the luminaire may further comprise a driver for supplying power to the LEDs of the LED filament.
  • Fig. 1 schematically shows a LED filament lamp according to the prior art, comprising LED filaments
  • Fig. 2a schematically shows LED filaments according to exemplifying embodiments of the present invention
  • Figs. 2b and 2c schematically disclose distributions of LED light of the LED filament according to exemplifying embodiments of the present invention.
  • Fig. 3 schematically shows a luminaire according to an exemplifying embodiment of the present invention.
  • Fig. 1 shows a LED filament lamp 10 according to the prior art, comprising a plurality of LED filaments 20.
  • LED filament lamps 10 of this kind are highly appreciated as they are very decorative, as well as providing numerous advantages compared to incandescent lamps such as a longer operational life, a reduced power consumption, and an increased efficiency related to the ratio between light energy and heat energy.
  • Fig. 2a schematically shows LED filaments 100 according to exemplifying embodiments of the present invention, denoted as i)-vii). It will be appreciated that there may be more examples of the LED filament 100, and that i)-vii) merely describe some embodiments thereof.
  • the LED filament 100 is configured to emit LED filament light 110.
  • the LED filament 100 may preferably have a length in the range from 1 cm to 20 cm, more preferably 2 cm to 12 cm, and most preferred 3 cm to 10 cm.
  • the LED filament 100 may preferably have a width in the range from 0.5 mm to 10 mm, more preferably 0.8 mm to 8 mm, and most preferred 1 to 5 mm.
  • the aspect ratio length/width is preferably at least 5, more preferably at least 8, and most preferred at least 10.
  • the LED filament 100 comprises an elongated carrier 120.
  • the carrier 130 may be light transmissive and/or reflective.
  • the carrier 120 may be flexible, and may for example comprise a polymer foil (e.g. polyimide (PI), polyethylene terephthalate (PET), etc.).
  • the carrier 120 may comprise one or more thermally conductive layers and one or more insulating layers.
  • a set 130 of linear arrays 130a, 130b of a plurality of LEDs 140 are arranged on the carrier 120.
  • the set 130 of linear arrays comprises two linear arrays 130a, 130b, but it should be noted that the number of arrays may be arbitrary.
  • the set 130 of linear arrays 130a, 130b comprises a first linear array 130a of a plurality of first LEDs 140a.
  • the number N of the plurality of first LEDs 140a is exemplified as 10, but the number N may be arbitrary.
  • the first LEDs 140a are arranged to emit first ultraviolet, UV, light in a wavelength range of 100-380 nm.
  • the set 130 of linear arrays 130a, 130b further comprises a second linear array 130b of a plurality of second LEDs 140b.
  • the second LEDs 140b are arranged to emit second UV light in a second wavelength range of 100-380 nm.
  • the number N of the plurality of second LEDs 140a is exemplified as 10, but the number N may be arbitrary.
  • Fig. 2b schematically shows the distribution of the first UV light 150 and the second UV light 160, provided by the LED filament, with intensity (y-axis, arb. units) as a function of wavelength (x-axis, arb. units).
  • the first UV light 150 has a first centroid wavelength, Xcl
  • the second UV light 160 has a second centroid wavelength, Xc2, wherein Xcl+30 nm ⁇ Xc2, preferably Xcl+40 nm ⁇ Xc2, more preferably Xcl+50 nm ⁇ Xc2, most preferably Xcl+60 nm ⁇ Xc2.
  • the first centroid wavelength, Xcl, and the second centroid wavelength, Xc2 may be in a UVC wavelength range of 100- 280 nm.
  • example i) of the LED arrangement 100 shows an embodiment in which the linear arrays 130a, 130b are arranged in parallel on the carrier 120. Furthermore, the linear arrays 130a, 130b elongate along a respective principal axis, A, and respective plurality of first and second LEDs 140a, 140b of the linear arrays 130a, 130b are aligned in a direction, B, perpendicular to, A. Preferably, at least three LEDs, such as at least five LEDs, or even more preferred seven LEDs, are aligned.
  • the plurality of first LEDs 140a is arranged offset with respect to the plurality of second LEDs 140b, with respect to the principal axis, A.
  • at least three LEDs such as at least five LEDs, or even more preferred seven LEDs, are arranged offset.
  • Example iii) of the LED arrangement 100 corresponds to example ii), with the difference that the distance, D, between the adjacently arranged linear arrays 130a, 130b, of the set 130 of linear arrays, is smaller.
  • the concentration of the number, N, of the plurality of first LEDs 140a per unit length, L is different from the concentration of the number, N, of the plurality of second LEDs 140b per unit length, L. More specifically, the concentration of the plurality of second LEDs 140b is twice as high as the concentration of the plurality of first LEDs 140a.
  • the number of LEDs may differ between the first and second arrays 130a, 130b.
  • Example v) of the LED arrangement 100 corresponds to example iv), with the difference that one of the electrodes is a common electrode for the first and second arrays 130a, 130b.
  • the first UV light 150 has a first centroid wavelength, Xcl
  • the second UV light 160 has a second centroid wavelength, Xc2
  • the third UV light 170 has a third centroid wavelength, Xc3, wherein Xcl+30 nm ⁇ Xc2 ⁇ Xc3-30 nm.
  • Xc2 ⁇ Xc3-40 nm more preferably Xc2 ⁇ Xc3-50 nm, and most preferably Xc2 ⁇ Xc3-60 nm.
  • one or more property of the LEDs (such as power (consumption) of the LEDs, the number of the LEDs, etc.) of the at least two linear arrays of the set of linear arrays may be configured such that a respective forward voltage to each of the at least two linear arrays of the set of linear arrays is the same.
  • the circuitry may comprise one or more resistor(s) in order to achieve this effect.
  • the first linear array may comprise one or more resistors, while the second linear array does not comprise any resistors.
  • the LED filament 100 may further comprise an encapsulant (not shown).
  • the encapsulant may comprise a light-scattering material configured to scatter light emitted from the plurality of LEDs 130a-c.
  • the light-scattering material may preferably have a reflectivity of > 70 %, more preferably > 80 %, and most preferably > 85 %.
  • the encapsulant may be flexible.
  • the encapsulant may comprise silicone.
  • the luminescent material of the encapsulant is configured to emit light under external energy excitation.
  • the luminescent material may comprise a fluorescent material.
  • the luminescent material may comprise an inorganic phosphor, an organic phosphor and/or quantum dots/rods. More specifically, the luminescent material of the encapsulant may comprises yttrium aluminium garnet (YAG), LuAg and/or LuYAG phosphor.
  • Fig. 3 schematically shows a luminaire 500 according to an embodiment of the present invention.
  • the luminaire 500 is exemplified as a light bulb, but it should be noted that the luminaire 500 alternatively may be a lamp, a light tube, etc.
  • the luminaire 500 may comprise one or more LED filaments 100 according to any one of the previously described embodiments. More specifically, the luminaire 500 in Fig. 3 comprises a controller 310 coupled to the LED filament(s) 100 (either by wire of wirelessly), wherein the controller 310 is configured to individually control the operation of the respective linear array of the set of linear arrays of the LED filament 100.

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  • Health & Medical Sciences (AREA)
  • Epidemiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

L'invention concerne un filament (100) de diode électroluminescente, DEL, configuré pour émettre une lumière de filament de DEL (110), comprenant un support (120), un ensemble (130) de réseaux linéaires (130a, 130b) d'une pluralité de diodes électroluminescentes, DEL, (140) disposées sur le support, l'ensemble de réseaux linéaires comprenant au moins un premier réseau linéaire (130a) d'une pluralité de premières DEL (140a), les premières DEL étant agencées pour émettre une première lumière ultraviolette, UV, (150) dans une plage de longueurs d'onde de 100-380 nm, un second réseau linéaire (130b) d'une pluralité de secondes DEL (140b), les secondes DEL étant agencées pour émettre une seconde lumière UV (160) dans une seconde plage de longueurs d'onde de 100-380 nm, la première lumière UV ayant une première longueur d'onde centroïde, λc1, et la seconde lumière UV ayant une seconde longueur d'onde centroïde, λc2, où λcl + 30 nm < λc2.
PCT/EP2023/064168 2022-06-02 2023-05-26 Filament à del comprenant des del agencées pour émettre une lumière uv WO2023232670A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP22177046 2022-06-02
EP22177046.4 2022-06-02

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WO2023232670A1 true WO2023232670A1 (fr) 2023-12-07

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203842065U (zh) * 2014-05-27 2014-09-24 厦门丰泓照明有限公司 一种便捷高效的led消毒灭菌装置
WO2017181751A1 (fr) * 2016-04-21 2017-10-26 圆融健康科技（深圳）有限公司 Lampe à filament uv
US10950584B2 (en) * 2017-11-03 2021-03-16 Ideal Industries Lighting Llc White light emitting devices having high luminous efficiency and improved color rendering that include pass-through violet emissions
WO2021063902A1 (fr) * 2019-10-01 2021-04-08 Signify Holding B.V. Agencement de filament à del
WO2022005505A1 (fr) * 2020-07-02 2022-01-06 Current Lighting Solutions, Llc Système et méthode de désinfection par lumière multispectrale

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203842065U (zh) * 2014-05-27 2014-09-24 厦门丰泓照明有限公司 一种便捷高效的led消毒灭菌装置
WO2017181751A1 (fr) * 2016-04-21 2017-10-26 圆融健康科技（深圳）有限公司 Lampe à filament uv
US10950584B2 (en) * 2017-11-03 2021-03-16 Ideal Industries Lighting Llc White light emitting devices having high luminous efficiency and improved color rendering that include pass-through violet emissions
WO2021063902A1 (fr) * 2019-10-01 2021-04-08 Signify Holding B.V. Agencement de filament à del
WO2022005505A1 (fr) * 2020-07-02 2022-01-06 Current Lighting Solutions, Llc Système et méthode de désinfection par lumière multispectrale

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