WO2013008120A1 - Feuille métallique de conversion de longueur d'onde pouvant être utilisée avec une source de lumière - Google Patents

Feuille métallique de conversion de longueur d'onde pouvant être utilisée avec une source de lumière Download PDF

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Publication number
WO2013008120A1
WO2013008120A1 PCT/IB2012/053280 IB2012053280W WO2013008120A1 WO 2013008120 A1 WO2013008120 A1 WO 2013008120A1 IB 2012053280 W IB2012053280 W IB 2012053280W WO 2013008120 A1 WO2013008120 A1 WO 2013008120A1
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WO
WIPO (PCT)
Prior art keywords
light
foil
light source
luminescent material
wavelength conversion
Prior art date
Application number
PCT/IB2012/053280
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English (en)
Inventor
Martinus Petrus Joseph PEETERS
Engelbertus Cornelius Petrus Maria Vossen
Christianus Josephus Roozekrans
Original Assignee
Koninklijke Philips Electronics N.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 Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Publication of WO2013008120A1 publication Critical patent/WO2013008120A1/fr

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/10—Apparatus or processes specially adapted to the manufacture of electroluminescent light sources
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/06—Luminescent, e.g. electroluminescent, chemiluminescent materials containing organic luminescent materials
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/52—PV systems with concentrators

Definitions

  • the invention relates to a wavelength conversion foil for use with a light source.
  • the foil is configured for increasing the efficiency of the light source.
  • the invention further relates to a light source assembly comprising such foil applied to a light source.
  • the invention also relates to a luminaire, a backlighting system and a display device comprising a light source with such foil.
  • Lamps generally comprise a light-transmitting vessel enclosing a space in which light is generated.
  • the lamp may, for example, be a halogen lamp comprising the light-transmitting vessel which comprises, for example, the halogen gas-filling and a filament for emitting light.
  • the lamp may, for example, be a discharge lamp in which the light-transmitting vessel is a discharge vessel which encloses a discharge space comprising a gas filling.
  • the discharge lamp also generally comprises discharge means for maintaining, in operation a discharge in the discharge space. The discharge emits light, which may be emitted by the discharge lamp.
  • the discharge lamp may comprise luminescent material for converting at least a part of the light emitted by the discharge into light of a different color.
  • low- pressure mercury vapor discharge lamps typically have a gas filling comprising mercury. The mercury present in the discharge generates ultraviolet light which is emitted from the discharge and impinges on luminescent material arranged to the inner wall of the discharge vessel. The luminescent material converts the ultraviolet radiation into visible light which is subsequently emitted by the low-pressure mercury vapor discharge lamp.
  • Such discharge lamps are also referred to as fluorescent lamps.
  • Low-pressure mercury vapor discharge lamps usually comprise a mixture of luminescent materials where a combination of the luminescent materials determines a color of the light emitted by fluorescent lamp.
  • luminescent materials are, for example, a blue-luminescent europium-activated barium magnesium aluminate, BaMgAlioOi 7 :Eu 2 + (also referred to as BAM), a green-luminescent cerium-terbium co-activated lanthanum phosphate, LaP0 4 :Ce,Tb (also referred to as LAP) and a red- luminescent europium-activated yttrium oxide, Y 2 0 3 :Eu (also referred to as YOX).
  • BAM blue-luminescent europium-activated barium magnesium aluminate
  • BaMgAlioOi 7 :Eu 2 + also referred to as BAM
  • LaP0 4 :Ce,Tb also referred to as LAP
  • YOX red- luminescent europium-activated yttrium oxide
  • the discharge vessel of the discharge lamp is usually constituted by a light- transmitting envelope enclosing a discharge space in a gastight manner.
  • the discharge vessel is generally circular and comprises both elongate and compact embodiments.
  • the elongated embodiments typically comprise a straight cylindrical envelope also commonly known as tubular light.
  • the envelope in compact embodiments of the low-pressure gas discharge lamp typically is circular, U-shaped, multiple U-shaped or twister shaped.
  • the means for generating and maintaining a discharge in the discharge space are electrodes arranged near the discharge space.
  • the discharge lamp is a so-called electrode-less discharge lamp, for example, an induction lamp where energy required for generating and/or maintaining the discharge is transferred through the discharge vessel by means of an induced alternating electromagnetic field.
  • the efficacy of fluorescent lamps is limited to approximately 100 Lm/W. Fluorescent lighting requires an efficiency improvement in order to be able to withstand the competition with LED solutions.
  • One of the measures to improve the efficiency is the provision of coating with organic phosphor on the outside of a gas-discharge lamp such as disclosed in US 6,570,319 B2. The organic phosphor then converts part of the short wavelength blue light to yellow / red light.
  • Conventional fluorescent lamps use a BAM phosphor to convert part of the UV-light into blue light.
  • the disadvantage of the BAM phosphor is that emission extends below 400 nm. Moreover, some of the mercury lines are present in this spectral region.
  • a drawback of the known organic phosphor coating is that the efficiency improvement of the light source is still relatively low.
  • the object is achieved with a wavelength conversion foil for use with a light source as claimed in claim 1.
  • the object is achieved with a light source assembly as claimed in claim 8.
  • the object is achieved with a luminaire as claimed in claim 11.
  • the object is achieved with a backlighting system as claimed in claim 12.
  • the object is achieved with a display device as claimed in claim 13.
  • the wavelength conversion foil in accordance with the invention is arranged for converting, in operational use, at least part of the UV-light into visible light.
  • the foil has a foil thickness and comprises polyethylene naphthalate for converting the UV light into a primary light distribution within the visible light spectrum.
  • the foil further comprises a first luminescent material for converting the primary light distribution at least partially into a secondary light distribution within the visible light spectrum, wherein the secondary light distribution is different from the first light distribution.
  • the mass fraction of the first luminescent material multiplied by the foil thickness of the wavelength conversion foil is equal to or below 100ppm*mm.
  • An effect of the wavelength conversion foil according to the invention is as follows.
  • the foil is provided on a light exit window of a light source that emits UV-light, such as the gas in a TL-lamp.
  • the inventors have realized that one of the problems of using a coating with organic phosphor is the small stokes shift of this phosphor.
  • the small stokes shift severely limits the possibilities to shift the light to longer wavelengths.
  • Due, due to the absorption/emission characteristic of this material, light that is absorbed within the desired wavelength range ( ⁇ 400nm) is also, for a significant part, re-emitted within the same wavelength range.
  • due to the absorption spectrum of organic phosphor it is impossible to absorb all the light below e.g.
  • a foil which comprises polyethylene naphthalate (PEN), which is optionally mixed with a secondary polymer material, such as polyethylene terephthalate (PET), this is also being referred to as the host matrix.
  • PEN polyethylene naphthalate
  • PET polyethylene terephthalate
  • the inventors have the following explanation for this rather surprising effect.
  • the foil becomes UV blocking, i.e. it is the foil having a very strong absorption below 370 nm.
  • the foil becomes luminescent (emitting blue light).
  • a low concentration of luminescent material such as organic phosphors F083 or F305 from BASF
  • the inventors have the following explanation for the surprising effect.
  • first light distribution i.e. blue light
  • first light distribution i.e. blue light
  • first light distribution i.e. blue light
  • the high refractive index of the PEN film only blue light emitted within a small angle (with respect to the foil surface) can escape from the foil. The rest of it is reflected at the surface (total internal reflection). This appears to be a positive effect, because a much higher absorption of the first luminescent material, i.e. Lumogen, is obtained due to the increased path length of the blue light.
  • the efficiency reduces again.
  • this optimum level is dependent on the thickness of the foil. More precise, they have discovered that in case of a thicker foil, the optimum level of organic phosphors is lower.
  • a positive effect is found in case a mass fraction of the first luminescent material multiplied by the foil thickness of the wavelength conversion foil is equal to or below 100ppm*mm.
  • the mass fraction of the first luminescent material multiplied by the foil thickness of the wavelength conversion foil is equal to or below 50ppm*mm. Within this range the advantageous effect of the invention is even more profound.
  • the mass fraction of the first luminescent material multiplied by the foil thickness of the wavelength conversion foil is equal to or below 10ppm*mm. Within this range the advantageous effect of the invention is even more profound.
  • the first luminescent material comprises an organic phosphor.
  • the organic phosphors are particularly advantageous, because they are relatively cheap.
  • Other advantages of using organic phosphors is their high quantum efficiency and their non-scattering properties. The latter implies that the scattering property of the foil may be independently established by the addition of inorganic particles.
  • the organic phosphor comprises perylene pigment.
  • the polymer matrix further comprises a scattering material.
  • Some scattering material may be present in the foil, to increase outcoupling of the light. The amount of scattering material should not be too high, in order to get enough absorption of the blue light generated by the PEN matrix by the luminescent material.
  • the foil further comprises a second luminescent material for converting the primary light distribution at least partially into a tertiary light distribution within the visible light spectrum, wherein the tertiary light distribution is different from the first light distribution and the second light distribution.
  • a second luminescent material for converting the primary light distribution partially in a tertiary light distribution enables to set the color point of the light source (a combination of the primary, secondary and tertiary light distributions).
  • the foil further comprises polyethylene terephthalate (PET).
  • PET polyethylene terephthalate
  • a mass ratio between polyethylene terephthalate and polyethylene naphthalate lies in the range between 0.05 and 0.5. This range is advantageous, because below 0.05 the absorption edge of the PEN comprising foil shifts too far into the UV spectrum, and above 0.5 the foil material becomes yellow, which implies absorption in the visible part of the spectrum. More information on the properties of PEN/PET material can be found in the following link:
  • the light source assembly comprises a light source and a light exit window for receiving light from the light source and for transmitting light to an ambient environment.
  • the light source assembly further comprises a foil according to the invention.
  • a benefit of the light source assembly according to the invention is that the light source assembly comprises an improved intensity of light from the light source due to the improved efficiency of the light source. Alternatively, a reduction of the energy of the light source may be obtained while
  • the light source comprises a gas-discharge lamp, wherein the lamp comprises:
  • a light-transmitting vessel enclosing, in a gastight manner, a space comprising a gas filling, the space comprising light generating means generating and/or maintaining, in operation, light emission from the space through the light-transmitting vessel.
  • the gas-discharge lamps is a TL lamp.
  • the luminaire comprises the light source assembly according to the invention.
  • a luminaire is a lighting fixture, which is a combination of a light source (provided with the foil in case of the invention) and electrical circuitry for connection to a power source.
  • the luminaire may also optionally comprise a reflector for directing the light emitted by the light source, an aperture (with or without a lens), a housing for the alignment and protection of the light source, and further electrical circuitry which may, for example, include a ballast.
  • a benefit of the luminaire according to the invention is that the luminaire comprises an improved intensity of light from the luminaire due to the improved efficiency of the light source assembly. Alternatively, a reduction of the energy of the lamp may be obtained while maintaining the same light intensity.
  • the backlighting system comprising the light source assembly according to the invention.
  • the display device comprises the backlighting system according to the invention and/or comprising the light source assembly according to the invention.
  • Fig. 1 shows a schematic cross-sectional view of a discharge lamp according to two different embodiments of the invention
  • Figs. 2 and 3 show schematic illustrations of part of the two embodiments of Fig. 1 , respectively;
  • Figs. 4 A and 4B show two variants of low-pressure gas discharge lamps according to other embodiments of the invention.
  • Fig. 5 shows a schematic representation of a luminaire according to yet another embodiment of the invention.
  • Fig. 6 shows a display system having a backlighting system according yet another embodiment of the invention.
  • discharge space comprising a gas filling 16 gas discharge in the discharge space 14
  • Fluorescent lamps use a BAM phosphor to convert part of the UV-light into blue light.
  • the disadvantage of the BAM phosphor is that emission extends below 400 nm.
  • some of the mercury lines are present in this spectral region. For efficiency reasons, emissions in this spectral region are undesired, and for CRI reasons they are not required. Converting part of this light into light within the 450 to 650 nm region will lead to an efficiency increase. If organic phosphors are used for this purpose, the broad emissions will likely lead to an increase in CRI.
  • organic phosphors in common plastic matrices will be hampered by the limited stokes shift of the organic phosphor materials. In other words, it will be difficult to convert this light to green/red. If an organic red dye/phosphor (for example F305 from BASF) is used, the absorption strength is low, requiring very high concentrations of the phosphor. Increasing the concentration of the dye, to obtain sufficient absorption below 400 nm will also result in absorption of light above 400 nm.
  • an organic red dye/phosphor for example F305 from BASF
  • PEN comprising host matrix
  • the disadvantages stated above are circumvented.
  • absorption of the short wavelength of the BAM light (or UV) is done by the polymer matrix.
  • the invention now renders it possible to obtain a high absorption strength for light below the absorption edge on the PEN comprising polymer with a low concentration of organic phosphor.
  • visible light refers to light in the spectrum ranging from 370nm to 750nm.
  • converting light refers the at least partial absorption of light having a first light distribution, and subsequent at least partial emission of light having a second light distribution, different from the first light distribution. These light distributions may overlap, i.e. they may share light with the same wavelength.
  • mass fraction refers to the fraction of one substance with a specific mass to the mass of the total mixture. Such definition is also found on Wikipedia, http://en.wikipedia.org/.
  • wavelength conversion foil is to be interpreted broadly. What is meant that there is a layer of material having the function of at least partially converting light. It is not relevant in what manner this layer is applied to a light-transmitting window of a light source. Thus, it also includes coatings having the same property.
  • Fig. 1 shows a schematic cross-sectional view of a discharge lamp (light source assembly) according to two different embodiments of the invention.
  • the discharge lamps 10A, 10B as schematically shown in Fig. 1 are low- pressure gas discharge lamps 10A, 10B which each comprise a light transmitting discharge vessel 12 which encloses a discharge space 14 in a gas-tight manner.
  • the discharge space 14 comprises a gas filling, for example, comprising a metal compound and a buffer gas.
  • Each low-pressure gas discharge lamp 10A, 10B further comprises discharge means 17 for coupling energy into the discharge space 14, for example, via capacitive coupling (not shown), inductive coupling (not shown), microwave coupling (not shown), or via electrodes 17 to obtain, in operation, a gas discharge 16 in the discharge space 14.
  • the discharge vessel 12 comprises a wall 12 having an inner surface and an outer surface. The inner surface of the discharge vessel 12 faces towards the discharge 16 and the outer surface of the discharge vessel 12 faces away from the discharge 16.
  • Each low-pressure gas discharge lamp 10A, 10B further comprises a wavelength conversion foil 18 comprising luminescent material.
  • the luminescent material for example, absorbs ultraviolet light emitted from the discharge and, for example, converts the absorbed ultraviolet light into visible light.
  • the discharge vessel 14 comprises a set of electrodes 17.
  • the electrodes 17 are electrical connections through the discharge vessel 14 of the low-pressure gas discharge lamp 10A, 10B.
  • a discharge 16 is initiated between the two electrodes 17.
  • This discharge 16 is generally located between the two electrodes 17 and is indicated in Fig. 1 as dashed area 16.
  • Alternative coupling elements such as capacitive couplers (not shown), inductive couplers (not shown), or microwave couplers (not shown) may be used.
  • the wavelength conversion foil (or coating) 18 comprises a mixture of luminescent materials which is used to be able to emit substantially white light.
  • the known low-pressure gas discharge lamps often a mix of the luminescent materials BaMgAlioOi7:Eu 2 + (also often indicated as BAM, emitting the primary color blue), LaP0 4 :Ce,Tb (also often indicated as LAP, emitting the primary color green) and Y 2 0 3 :Eu (also often indicated as YOX, emitting the primary color red) is used to obtain substantially white light.
  • the wavelength conversion foil 18 is applied to the outer surface of the discharge vessel 12 and to the inner surface of the discharge vessel 12 respectively.
  • the wavelength conversion foil 18 comprises polyethylene naphthalate (PEN), which effectively absorbs the light with a wavelength below 380nm.
  • the foil 18 may also comprise other materials in addition, such as polyethylene terephthalate (PET), or any other suitable polymer to which luminescent materials such as an organic phosphor can be added.
  • PET polyethylene terephthalate
  • luminescent materials such as an organic phosphor can be added.
  • organic phosphors are advantageous (because they are relatively cheap, non-scattering and efficient), but that the invention is not limited to such luminescent materials.
  • inorganic phosphors or phosphors that are coating with ceramic materials may be used.
  • the wavelength conversion foil 18 comprises a first luminescent material, such as organic phosphor for converting the primary light distribution at least partially into a secondary light distribution within the visible light spectrum, wherein the secondary light distribution is different from the first light distribution.
  • a first luminescent material such as organic phosphor for converting the primary light distribution at least partially into a secondary light distribution within the visible light spectrum, wherein the secondary light distribution is different from the first light distribution.
  • the mass fraction of the first luminescent material should be kept low in a specific relation to the thickness of the foil 18. This means that the mass fraction of the first luminescent material multiplied by the foil thickness (see reference numeral T in Figs. 2 and 3) of the wavelength conversion foil 18 is equal to or below 100ppm*mm, preferably below 50ppm*mm and even more preferably below 10ppm*mm.
  • the mechanism of the invention is considered as follows.
  • the PEN comprising foil 18 absorbs the UV light originating from the gas discharge, i.e. most of the light below 380nm wavelength is absorbed. Consequently, the PEN comprising foil 18 emits light having a first light distribution. In the case of PEN this light comprises blue light within the light-transmitting foil 18. The blue light is effectively "captured" within the foil (being reflected at the layer interfaces of the foil 18). At a certain moment the blue light is absorbed by the first luminescent material, such as organic phosphors and partially converted into light with a second light-distribution within the visible light spectrum having larger wavelengths.
  • the foil 18 also comprises a second luminescent material for converting the light into a tertiary light distribution (e.g. red) different from the second (e.g. yellow/green) and the first light distributions (e.g. blue).
  • a second luminescent material for converting the light into a tertiary light distribution (e.g. red) different from the second (e.g. yellow/green) and the first light distributions (e.g. blue).
  • red tertiary light distribution
  • the first light distributions e.g. blue
  • FIGS. 2 and 3 show schematic illustrations of part of the two embodiments of
  • Fig. 1 respectively. A few features have been left out for rendering the figures easier to interpret.
  • the figures merely show what is meant with the thickness T of the wavelength conversion foil 18, namely the dimension perpendicular to the plane in which the foil extends.
  • the wavelength conversion foil 18 has typically a thickness T between 10 and 300 ⁇ for a foil, and in case of a coating the thickness may be thinner.
  • adding PET material to the PEN matrix improves the lifetime stability of the organic phosphors
  • a mass ratio between polyethylene terephthalate and polyethylene naphthalate lies in the range between 0.05 and 0.5.
  • Figs. 4 A and 4B show two variants of low-pressure gas discharge lamps (light source assemblies) according to other embodiments of the invention.
  • the compact fluorescent lamps 3 OA, 30B comprise a plurality of u-shaped discharge vessels 32 which are packed closely together.
  • the u-shaped discharge vessels 32 each comprise a respective discharge space 34 comprising, in operation, and a discharge 36.
  • the outer wall of the discharge vessel 32 comprises the wavelength conversion foil 18 according to the invention.
  • Each compact fluorescent lamp 3 OA, 30B further comprises an additional electronic circuit 39 hidden in a base of the compact fluorescent lamp 3 OA, 30B.
  • the additional electronic circuit 39 regulates the switching on of the compact fluorescent lamp 30A, 30B.
  • the temperature, in operation, of the luminescent material of the compact fluorescent lamp 30A, 30B increases at least locally above 80 degrees Celsius.
  • the compact fluorescent lamp 30B is arranged within an outer-bulb 38.
  • This outer-bulb 38 may have any shape, for example, mimicking the shape of an
  • the outer-bulb 38 has a cylindrical shape.
  • the inner surface and/or outer surface of the outer-bulb 38 may comprise a further wavelength conversion foil 38' for further increasing the efficiency of the lamp.
  • such further wavelength conversion foil 38' may be the only foil present in the lamp.
  • FIG. 5 shows a schematic representation of a luminaire according to yet another embodiment of the invention.
  • a luminaire 60 is a lighting fixture which is a combination of a light source assembly 10A, 10B and electrical circuitry for connection to a power source (not shown).
  • the luminaire 60 may also optionally comprise a reflector for directing the light emitted by the light source, an aperture (with or without a lens), a housing for the alignment and protection of the light source, and further electrical circuitry which may, for example, include a ballast.
  • the luminaire 60 comprises a lamp 10A, 10B, 3 OA, 30B according to the invention which provides either an improved intensity of light from the luminaire 60 due to the improved efficiency of the lamp 10A, 10B, 3 OA, 30B or which provides a reduction of the energy of the lamp 10A, 10B, 3 OA, 30B while emitting the same light intensity.
  • Fig. 6 shows a display system having a backlighting system according yet another embodiment of the invention.
  • the display system 70 comprises a display 74, for example, a well-known liquid crystal display 74.
  • the liquid crystal display device generally contains a polarizer (not shown), an array of light valves (not shown) and an analyzer (not shown).
  • Each light valve typically comprises liquid crystal material, which can alter a polarization direction of incident light, for example, by applying an electrical field across the liquid crystal material.
  • the arrangement of polarizer, light valve and analyzer is such that when the light valve is switched to, for example, "bright” the light emitted from the backlighting system 72 will be transmitted. When the light valve is switched to, for example, “dark” the light emitted from the backlighting system 72 will be blocked. In that way an image can be produced on the display 74.
  • the backlighting system 72 comprises a lamp 10A, 10B, 3 OA, 30B according to the invention, for example, a low-pressure mercury vapor discharge lamp 10A, 10B.
  • the backlighting system 72 typically comprises an array of low-pressure mercury vapor discharge lamps 10A, 10B or comprises a low-pressure gas discharge lamp which meanders parallel to the display 74.
  • the use of the light source assembly 10A, 10B, 30A, 30B according to the invention in the backlighting system 72 will beneficially improve the efficiency of the backlighting system 72 - and as such of the display device 70.
  • a wavelength conversion foil 18 may be provided on the screen 74 for example.
  • the invention may be applied in various lighting applications.
  • the TL lamp can be made using the standard production process with a slightly adjusted phosphor mix.
  • the phosphor composition has to be adjusted slightly in order to yield the correct color point when combined with the organic phosphors (such as LumogenTM) containing films.
  • the wavelength conversion foil 18 containing a yellow and/or red LumogenTM is applied.
  • any reference signs placed between parentheses shall not be construed as limiting the claim.
  • Use of the verb "comprise” and its conjugations does not exclude the presence of elements or steps other than those stated in a claim.
  • the article “a” or “an” preceding an element does not exclude the presence of a plurality of such elements.
  • the invention may be implemented by means of hardware comprising several distinct elements. In the device claim enumerating several means, several of these means may be embodied by one and the same item of hardware. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)

Abstract

Cette invention concerne une feuille métallique de conversion de longueur d'onde (18) pouvant être utilisée avec une source de lumière (14, 16, 17) conçue pour émettre une lumière UV, la feuille métallique (18) étant placée de façon à convertir, en utilisation, au moins une partie de la lumière UV en lumière visible. La feuille métallique (18) a une épaisseur de feuille métallique (T) et comprend du polyéthylène naphtalate pour convertir la lumière UV en une distribution de lumière primaire dans le spectre de la lumière visible. La feuille métallique (18) comprend en outre un premier matériau luminescent pour convertir la distribution de lumière primaire au moins partiellement en une distribution de lumière secondaire dans le spectre de la lumière visible, la distribution de lumière secondaire étant différente de la distribution de lumière primaire. La fraction en poids du premier matériau luminescent multipliée par l'épaisseur de feuille métallique (T) de la feuille métallique de conversion de longueur d'onde (18) est égale ou inférieure à 100 ppm*mm. De manière inattendue, cette invention entraîne un accroissement significatif du rendement d'une lampe à décharge de gaz à laquelle elle est appliquée, malgré le fait que la fraction en poids du premier matériau luminescent soit maintenue assez basse. Cette invention concerne également un ensemble source de lumière comprenant la feuille métallique de conversion de longueur d'onde ci-décrite.
PCT/IB2012/053280 2011-07-08 2012-06-28 Feuille métallique de conversion de longueur d'onde pouvant être utilisée avec une source de lumière WO2013008120A1 (fr)

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US201161505663P 2011-07-08 2011-07-08
US61/505,663 2011-07-08

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6570319B2 (en) 2000-01-18 2003-05-27 Koninklijke Philips Electronics N.V. Soft-tone fluorescent lamp
WO2004037515A1 (fr) * 2002-10-24 2004-05-06 3M Innovative Properties Company Procede de fabrication de dispositifs optiques a gain eleve presentant une phase continue et a dispersion
WO2007042438A1 (fr) * 2005-10-12 2007-04-19 Ciba Specialty Chemicals Holding Inc. Pigments luminescents encapsulés
EP2135737A1 (fr) * 2007-04-06 2009-12-23 Asahi Glass Company, Limited Film de conversion de longueur d'onde, film pour usage agricole, structure et composition de formation de film de revêtement
US20110099864A1 (en) * 2006-05-24 2011-05-05 3M Innovative Properties Company Backlight asymmetric light input wedge

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6570319B2 (en) 2000-01-18 2003-05-27 Koninklijke Philips Electronics N.V. Soft-tone fluorescent lamp
WO2004037515A1 (fr) * 2002-10-24 2004-05-06 3M Innovative Properties Company Procede de fabrication de dispositifs optiques a gain eleve presentant une phase continue et a dispersion
WO2007042438A1 (fr) * 2005-10-12 2007-04-19 Ciba Specialty Chemicals Holding Inc. Pigments luminescents encapsulés
US20110099864A1 (en) * 2006-05-24 2011-05-05 3M Innovative Properties Company Backlight asymmetric light input wedge
EP2135737A1 (fr) * 2007-04-06 2009-12-23 Asahi Glass Company, Limited Film de conversion de longueur d'onde, film pour usage agricole, structure et composition de formation de film de revêtement

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