EP1160834B1 - Lampe à décharge à vapeur de mercure à basse pression avec ampoule extérieure - Google Patents

Lampe à décharge à vapeur de mercure à basse pression avec ampoule extérieure Download PDF

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Publication number
EP1160834B1
EP1160834B1 EP01000191A EP01000191A EP1160834B1 EP 1160834 B1 EP1160834 B1 EP 1160834B1 EP 01000191 A EP01000191 A EP 01000191A EP 01000191 A EP01000191 A EP 01000191A EP 1160834 B1 EP1160834 B1 EP 1160834B1
Authority
EP
European Patent Office
Prior art keywords
low
pressure mercury
gas discharge
bulb
phosphor
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
EP01000191A
Other languages
German (de)
English (en)
Other versions
EP1160834A2 (fr
EP1160834A3 (fr
Inventor
Thomas Dr. Philips Corporate Intellectual Jüstel
Cornelis Dr. Philips Corporate Intellectual Ronda
Hans Dr. Philips Corporate Intellectual Nikol
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Philips Intellectual Property and Standards GmbH
Koninklijke Philips NV
Original Assignee
Philips Intellectual Property and Standards GmbH
Koninklijke Philips Electronics NV
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 Philips Intellectual Property and Standards GmbH, Koninklijke Philips Electronics NV filed Critical Philips Intellectual Property and Standards GmbH
Publication of EP1160834A2 publication Critical patent/EP1160834A2/fr
Publication of EP1160834A3 publication Critical patent/EP1160834A3/fr
Application granted granted Critical
Publication of EP1160834B1 publication Critical patent/EP1160834B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/30—Vessels; Containers
    • H01J61/32—Special longitudinal shape, e.g. for advertising purposes
    • H01J61/327—"Compact"-lamps, i.e. lamps having a folded discharge path
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/30—Vessels; Containers
    • H01J61/34—Double-wall vessels or containers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/38—Devices for influencing the colour or wavelength of the light
    • H01J61/42—Devices for influencing the colour or wavelength of the light by transforming the wavelength of the light by luminescence
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/38—Devices for influencing the colour or wavelength of the light
    • H01J61/42—Devices for influencing the colour or wavelength of the light by transforming the wavelength of the light by luminescence
    • H01J61/44—Devices characterised by the luminescent material

Definitions

  • the invention relates to a low-pressure mercury discharge lamp, in particular a compact fluorescent lamp, which is provided with an inner bulb, which forms a gas discharge vessel and the wall of a material which is permeable to electromagnetic radiation and coated with a phosphor, with an outer bulb, the inner bulb surrounds, and whose wall contains a phosphor, and is equipped with means for generating and maintaining a low-pressure mercury gas discharge.
  • a conventional compact fluorescent lamp usually consists of a thin, single or multi-folded tubular gas discharge vessel, at the ends of which electrodes, e.g. Wire spirals of tungsten, are located.
  • the discharge vessel contains in addition to a noble gas filling a small amount of mercury and is mounted together with ballast and starter on a pedestal.
  • a low-pressure mercury gas discharge generates UV radiation, which is converted into visible light by one or more UV phosphors, with which the inside of the gas discharge vessel is coated.
  • the glass type of the gas discharge vessel is generally chosen to be suitable for mass production with short cycle times. These types of glass are transparent to visible light and UV-A light with a wavelength up to 300 nm, but impermeable to UV with a wavelength ⁇ 300 nm.
  • a protective outer bulb can also be placed over it.
  • these outer bulbs are given the appearance of conventional pear-shaped incandescent bulbs to provide the consumer with the accustomed appearance of lights.
  • a low pressure gas discharge lamp in which the discharge vessel forms an electromagnetic radiation permeable inner bulb, which is surrounded by an outer bulb, and the outside of the inner bulb and / or the inside of the outer bulb is provided with a phosphor layer and the inner bulb contains mercury vapor and / or metal vapor-generating compounds and / or contains noble gases and is permeable to the electromagnetic radiation at the excitation of the respective gases to fluorescence arise.
  • these are inner bulb made of quartz or UV-permeable Spezialglassorten.
  • One object of the present invention is, inter alia, to provide a low-cost fluorescent lamp with an outer bulb which has an improved luminous efficacy.
  • a low-pressure mercury gas discharge lamp which is equipped with an inner bulb, which forms a gas discharge vessel, and an outer bulb, which surrounds the inner bulb, and means for generating and maintaining a low-pressure mercury gas discharge, wherein the Wall of the inner piston is made of a material which is transparent to the UV-A radiation and coated with a UV phosphor, characterized in that the outer bulb contains a UV-A absorbing phosphor.
  • Such a low-pressure mercury gas discharge lamp can be produced from inexpensive types of glass. Their light output is improved despite absorption losses in the UV-A absorbing phosphor layer in the area of high sensitivity to the eye, because in addition UV-A radiation is converted into visible light.
  • the low-pressure mercury discharge lamp according to the invention does not emit UV-A radiation to the outside.
  • the damaging, photoionizing effect of this radiation on the human skin, colors, plastics and rubber products is thus avoided. Therefore, the low-pressure mercury discharge lamps according to the invention are particularly suitable for the illumination of offices, museums and laboratories.
  • the wall of the outer bulb may comprise a coating containing the UV-A absorbing phosphor.
  • the wall of the outer bulb is made of a material containing a polymeric plastic and the UV-A absorbing phosphor. This embodiment, in which the UV-A absorbing phosphor is embedded in the polymer plastic, is particularly suitable for hydrolysis-sensitive phosphors.
  • the UV-A absorbing phosphor is selected from the group ZnS: Ag, YVO 4 : Eu, Y (V, P) O 4 : Eu, Y 2 O 2 S: Eu, CaSiO 3 : Ce, Mn, CaSO 4 : Ce, Mn, Y 2 SiO 5 : Ce, Mn, BaMgAl 10 O 17 : Eu, Mn and (Ba, Sr, Ca) 5 (PO 4 ) 3 Cl: Eu, Mn.
  • These UV-A absorbing phosphors are characterized by a high reflectance in the visible range of 400 to 780 nm.
  • the UV-A absorbing phosphor is selected from the group ZnS: Cu, Au; CaS: Eu; SrGa 2 S 4 : Eu, and Mg 4 GeO 5.5 F: Mn. These UV-A absorbing phosphors have a body color that can be used to create decorative effects.
  • the inner bulb is tubular and folded or tubular and coiled, so that it can be enveloped by a pear-shaped outer bulb.
  • Fig. 1 schematically shows a cross section through a low-pressure mercury discharge lamp according to the invention.
  • an inner bulb 1 which forms the gas discharge vessel for the low-pressure mercury gas discharge. At both ends of the inner bulb electrodes are melted, ignited by the gas discharge can be.
  • the inner bulb is filled with mercury vapor of a few hundredths of a Torr and argon.
  • the wall of the inner bulb is made of a material that is transparent to UV-A radiation with a wavelength between 320 to 400 nm, and is lined on the inside with a phosphor layer.
  • the inner piston 1 is tubular and folded in a U-shape and enveloped by a pear-shaped outer bulb 2.
  • the low pressure mercury discharge lamp further comprises means for generating and maintaining a low pressure mercury gas discharge, such as e.g. Throttle and starter.
  • the inner piston may also be a multi-folded or coiled tube.
  • inner piston and outer piston coaxial tubes in rod, ring or U-shape.
  • the inner bulb is preferably made of a type of glass, as is commonly used for the production of incandescent lamps and fluorescent tubes, for example from a sodium lime silicate glass with a content of 69 to 73% SiO 2 , 1 to 2% Al 2 O 3 , 3 bis 4% MgO, 15 to 17% Na 2 O, 4.2 to 4.6 CaO, 0.1 to 2% BaO and 0.4 to 1.6% K 2 O.
  • a sodium lime silicate glass with a content of 69 to 73% SiO 2 , 1 to 2% Al 2 O 3 , 3 bis 4% MgO, 15 to 17% Na 2 O, 4.2 to 4.6 CaO, 0.1 to 2% BaO and 0.4 to 1.6% K 2 O.
  • other types of glass that allow UV-A radiation to pass through to 300 nm can also be used as piston material for the inner bulb.
  • the inner bulb is coated on its inner bulb wall with one or more UV phosphors which absorb the UV light generated by the low pressure mercury gas discharge and convert it to visible light.
  • Each phosphor has its characteristic absorption and emission spectrum. Since in the low-pressure mercury discharge, by far the largest part of the energy is emitted in the resonance lines at 185.0 and 253.7 nm, the absorption coefficient of the phosphor for the inner bulb in this area must also be high.
  • CeMgAl 11 O 19 Eu 2+ and terbium activated cerium magnesium aluminate CeMgAl 11 O 19 : Gd, Tb or LaPO 4: Ce, Tb used together with Y 2 O 3 : Eu as a triband phosphor mixture.
  • the optimum thickness of the phosphor layer on the inner bulb is 30 to 50 nm. Because on the one hand, the layer may only be so thin that enough UV radiation is absorbed, but also so thick that not too much of the visible radiation in the inside grains of the phosphor layer is formed, is absorbed. Therefore, the phosphor layer on the inner bulb can not be applied so thick that all UV radiation is absorbed Since lamp glass as well as the common types of glass is permeable to UV-A radiation, this can therefore leave the inner bulb.
  • the outer bulb can also be made of a conventional type of lamp glass. If the outer bulb is made of glass, it is preferred that the UV-A phosphor is applied in the form of a coating.
  • the wall of the outer bulb is made of a material comprising a polymeric plastic and a UV-A absorbing phosphor.
  • a polymeric plastic is polymethylmethacrylate (PMMA), polyethylene terephthalate (THV), fluoroethylene propylene (FEP) or polyvinyl difluoride (PVDF).
  • the UV-A absorbing phosphor for the outer bulb is a phosphor whose absorption maximum in the UV-A range is between 320 and 400 nm and which emits in the visible range.
  • Suitable UV-A-absorbing phosphors are, for example, phosphors which, in addition to an activator, also contain a sensitizer which absorbs the UV-A radiation and transfers it to the activator.
  • Ce (III) and Eu (II) ions are suitable sensitizers, as described, for example, in CaSiO 3 : Ce, Mn, CaSO 4 : Ce, Mn, Y 2 SiO 5 : Ce, Mn , BaMgAl 10 O 17 : Eu, Mn and (Ba, Sr, Ca) 5 (PO 4 ) 3 Cl: Eu, Mn are included.
  • Eu (III) -containing phosphors may contain vanadate ions VO 4 3- as a sensitizer, as it is contained, for example, in the phosphors YVO 4 : Eu and Y (V, P) O 4 : Eu.
  • Other suitable UVA absorbing phosphors contain host lattices with a narrow bandgap with a bandwidth between 3.0 and 4.0 eV. The illumination mechanism is such that the host lattice absorbs the UV-A radiation and transfers it to the activator. Examples of this type of UV-A absorbing phosphors are ZnS: Ag and Y 2 O 2 S: Eu.
  • UV-A absorbing phosphors are used with a body color, such.
  • UV-A absorbing phosphors can be produced in an optimal particle size distribution with an average particle size of 0.5 to 1 ⁇ m. It is determined by the properties of the phosphor to absorb UV radiation and both absorb and scatter visible radiation, but also by the need to form a phosphor layer firmly adhered to the glass wall. The latter requirement is met only by very small grains whose luminous efficacy is lower than the slightly larger grains.
  • the phosphor powder is preferably mixed with plastic pellets and then extruded and rolled into a film. The film can then be formed into an outer bulb.
  • UV-absorbing phosphor is to be applied in a coating on the outer bulb, so both dry coating methods, such as. As electrostatic deposition or electrostatically assisted dusting, as well as a wet coating method such. As diving or spraying into consideration.
  • the phosphors must be dispersed in water, an organic solvent optionally together with a dispersing agent, a surfactant and an anti-foaming agent, or a binder preparation.
  • Suitable binder formulations for a luminaire according to the invention are organic or inorganic binders having an operating temperature of 250 ° C without decomposition, embrittlement or discoloration survive.
  • the solvent for the phosphor preparation is water to which a thickener such as polymethacrylic acid or polypropylene oxide is added. Usually you use more additives such. As dispersants, defoamers and powder conditioners such as alumina, aluminum oxynitride or boric acid.
  • the phosphor preparation is poured, rinsed or sprayed onto the inside of the outer bulb. The coating is then dried with hot air.
  • the layers generally have a layer thickness of 1 to 50 microns.
  • the electrons emitted from the electrodes excite the mercury atoms of the gas filling to emit UV radiation of the wavelength and visible radiation.
  • the UV radiation is incident on the phosphor coating of the inner bulb and stimulates it to emit visible radiation and UV-A radiation.
  • the visible radiation passes through the outer bulb unhindered.
  • the UV-A radiation which leaves the inner bulb, excites the UV-A absorbing phosphor in the outer bulb to emit additional visible light.
  • a dispersion of 15.0% by weight of Y 2 SiO 5 : Ce, Mn, 0.75% by weight of sodium polyacrylate as dispersant and 0-075% by weight of polyethylene propylene oxide as antifoam agent is wet-ground with water in a stirred mill, until the agglomerated phosphor is dispersed.
  • the cleaned and baked lamp flask are immersed in this dispersion and then baked at 480 ° C.
  • the applied phosphor amount is 5.0 g.
  • the coated outer bulb is mounted in a conventional manner together with the inner piston, ballast and starter on a common base.
  • Y 2 O 2 S Eu and 25 g of polyethylene terephthalate are dissolved in 100 g of an acetone / toluene mixture. With 10 g of this solution, the inside of a lamp envelope is sprayed. Subsequently, the coating is dried in a stream of air.
  • the coated outer bulb is mounted in a conventional manner together with the inner piston, ballast and starter on a common base.
  • a mixture of 90 parts of polymethylmethacrylate pellets are mixed with 10 parts of CaS: Eu and extruded into a film at 295 ° C and formed into a pear-shaped flask.
  • the outer bulb is mounted in a conventional manner together with the inner piston, ballast and starter on a common base.

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Luminescent Compositions (AREA)

Claims (8)

  1. Lampe à décharge de mercure à basse pression qui est équipée d'une ampoule interne formant un tube de décharge et une ampoule externe entourant l'ampoule interne et de moyens pour la production et le maintien d'une décharge de mercure à basse pression, la paroi de l'ampoule interne se composant d'un matériau qui est perméable aux rayons UV et étant revêtue d'une substance luminescente UV, caractérisée en ce que l'ampoule externe contient une substance luminescente absorbant les rayons UV-A.
  2. Lampe à décharge de mercure à basse pression conformément à la revendication 1, caractérisée en ce que la paroi de l'ampoule externe contient la substance luminescente absorbant les rayons UV-A.
  3. Lampe à décharge de mercure à basse pression conformément à la revendication 1, caractérisée en ce que la paroi de l'ampoule externe porte un revêtement qui contient la substance luminescente absorbant les rayons UV-A.
  4. Lampe à décharge de mercure à basse pression conformément à la revendication 2, caractérisée en ce que la paroi de l'ampoule externe se compose d'un matériau qui contient un plastique polymère et la substance luminescente absorbant les rayons UV-A.
  5. Lampe à décharge de mercure à basse pression conformément à la revendication 1, caractérisée en ce que la substance luminescente absorbant les rayons UV-A est sélectionnée dans le groupe ZnS:Ag YVO4:Eu, Y(V,P)O4:Eu, Y2O2S:Eu, CaSiO3:Ce,Mn, CaSO4:Ce,Mn, Y2SiO5:Ce,Mn, BaMgAl10O17:Eu,Mn et (Ba,Sr,Ca)5(PO4)3Cl:Eu,Mn.
  6. Lampe à décharge de mercure à basse pression conformément à la revendication 1, caractérisée en ce que la substance luminescente absorbant les rayons UV est sélectionnée dans le groupe ZnS:Cu,Au; CaS:Eu; SrGa2S4:Eu, et Mg4GeO5,5F:Mn.
  7. Lampe à décharge de mercure à basse pression conformément à la revendication 1, caractérisée en ce que l'ampoule interne est de conception tubulaire et pliée.
  8. Lampe à décharge de mercure à basse pression conformément à la revendication 1, caractérisée en ce que l'ampoule interne est tubulaire et enroulée.
EP01000191A 2000-05-31 2001-05-29 Lampe à décharge à vapeur de mercure à basse pression avec ampoule extérieure Expired - Lifetime EP1160834B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10026909A DE10026909A1 (de) 2000-05-31 2000-05-31 Niederdruck-Quecksilber-Entladungslampe mit Aussenkolben
DE10026909 2000-05-31

Publications (3)

Publication Number Publication Date
EP1160834A2 EP1160834A2 (fr) 2001-12-05
EP1160834A3 EP1160834A3 (fr) 2003-09-03
EP1160834B1 true EP1160834B1 (fr) 2008-10-08

Family

ID=7644181

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01000191A Expired - Lifetime EP1160834B1 (fr) 2000-05-31 2001-05-29 Lampe à décharge à vapeur de mercure à basse pression avec ampoule extérieure

Country Status (5)

Country Link
US (1) US6888302B2 (fr)
EP (1) EP1160834B1 (fr)
JP (1) JP2002025502A (fr)
CN (1) CN1222981C (fr)
DE (2) DE10026909A1 (fr)

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KR100791564B1 (ko) * 1999-12-21 2008-01-03 삼성에스디아이 주식회사 희토류 산화물이 코팅된 형광체 및 그의 제조방법
DE10231257A1 (de) * 2002-07-11 2004-01-22 Philips Intellectual Property & Standards Gmbh Bräunungsvorrichtung
JP2006504238A (ja) * 2002-10-23 2006-02-02 コーニンクレッカ　フィリップス　エレクトロニクス　エヌ　ヴィ 低圧水銀蒸気放電ランプ
US20040178734A1 (en) * 2003-03-13 2004-09-16 Yoshihisa Nagasaki Fluorescent device, fluorescent lamp and glass composite
US20050104501A1 (en) * 2003-04-04 2005-05-19 Transworld Lighting, Inc. High efficiency gas discharge lamps
US20050179390A1 (en) * 2003-04-04 2005-08-18 Transworld Lighting, Inc. Compact fluorescent lamp
DE10324832A1 (de) * 2003-06-02 2004-12-23 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Entladungslampe mit Leuchtstoff
JP2005281341A (ja) * 2004-03-26 2005-10-13 Nec Lighting Ltd 蛍光ランプ
JP4995413B2 (ja) * 2004-05-31 2012-08-08 パナソニック株式会社 ランプ用ガラス組成物およびこれを用いたランプ
US7362049B2 (en) * 2004-12-28 2008-04-22 Osram Sylvania Inc. Blue-enriched incandescent lamp
TW200642841A (en) * 2005-06-08 2006-12-16 Nanoforce Technologies Corp After glow lighting film having UV filtering and explosion-proof
US20090072703A1 (en) * 2006-05-01 2009-03-19 Koninklijke Philips Electronics N.V. Low-pressure discharge lamp
JP5027463B2 (ja) * 2006-09-06 2012-09-19 株式会社日立製作所 画像表示装置
US20090015129A1 (en) * 2007-07-12 2009-01-15 Noam Arye Method and device for a compact fluorescent bulb
EP2105947B1 (fr) * 2008-02-29 2011-01-26 Toshiba Lighting & Technology Corporation Lampe fluorescente avec ballast incorporé et luminaire associé
CN106252193A (zh) * 2015-06-03 2016-12-21 秦军 一种照明灯具

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Also Published As

Publication number Publication date
US6888302B2 (en) 2005-05-03
JP2002025502A (ja) 2002-01-25
US20020027420A1 (en) 2002-03-07
DE50114377D1 (de) 2008-11-20
CN1326215A (zh) 2001-12-12
CN1222981C (zh) 2005-10-12
EP1160834A2 (fr) 2001-12-05
EP1160834A3 (fr) 2003-09-03
DE10026909A1 (de) 2001-12-06

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