WO2004049387A2 - Low-pressure gas discharge lamp with mercury-free gas filling - Google Patents

Low-pressure gas discharge lamp with mercury-free gas filling Download PDF

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Publication number
WO2004049387A2
WO2004049387A2 PCT/IB2003/005212 IB0305212W WO2004049387A2 WO 2004049387 A2 WO2004049387 A2 WO 2004049387A2 IB 0305212 W IB0305212 W IB 0305212W WO 2004049387 A2 WO2004049387 A2 WO 2004049387A2
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WO
WIPO (PCT)
Prior art keywords
gas discharge
compounds
low
pressure gas
discharge lamp
Prior art date
Application number
PCT/IB2003/005212
Other languages
French (fr)
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WO2004049387A3 (en
Inventor
Albert Comberg
Rainer Hilbig
Robert Scholl
Original Assignee
Philips Intellectual Property & Standards Gmbh
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 Philips Intellectual Property & Standards Gmbh, Koninklijke Philips Electronics N.V. filed Critical Philips Intellectual Property & Standards Gmbh
Priority to AU2003276577A priority Critical patent/AU2003276577A1/en
Publication of WO2004049387A2 publication Critical patent/WO2004049387A2/en
Publication of WO2004049387A3 publication Critical patent/WO2004049387A3/en

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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
    • H01J61/70—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/12—Selection of substances for gas fillings; Specified operating pressure or temperature
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J65/00—Lamps without any electrode inside the vessel; Lamps with at least one main electrode outside the vessel
    • H01J65/04—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels
    • H01J65/042—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels by an external electromagnetic field

Definitions

  • the invention relates to a low-pressure gas discharge lamp provided with a gas discharge vessel containing a gas filling, with electrodes, and with means for generating and maintaining a low-pressure gas discharge.
  • the light generation in low-pressure gas discharge lamps is based on the fact that charge carriers, in particular electrons, but also ions are accelerated by an electric field between the electrodes of the lamp so strongly that they excite or ionize the gas atoms or molecules of the gas filling owing to collisions in the gas filling of the lamp.
  • charge carriers in particular electrons, but also ions are accelerated by an electric field between the electrodes of the lamp so strongly that they excite or ionize the gas atoms or molecules of the gas filling owing to collisions in the gas filling of the lamp.
  • Conventional low-pressure gas discharge lamps contain mercury in their gas fillings and in addition comprise a phosphor layer on the inside of the gas discharge vessel.
  • mercury vapor generates primarily radiation in the high-energy, but invisible UV-C region of the electromagnetic spectrum, which radiation is to be converted first into the visible, substantially lower-energy radiation by the phosphors. The energy difference is converted into undesirable heat radiation during this.
  • the mercury in the gas filling is also increasingly regarded as an environmentally hazardous and toxic substance which is to be avoided as much as possible in modern mass manufacture because of its environmental risks during use, manufacture, and disposal.
  • a low-pressure gas discharge lamp is known, for example, from GB 2 014 358 A, which comprises a discharge vessel, electrodes, and a filling comprising at least one copper halide as the UV emitter. This low-pressure gas discharge lamp containing copper halide emits in the visible range as well as in the UV range at 324.75 and 327.4 nm.
  • the object is achieved by means of a low-pressure gas discharge lamp which is provided with a gas discharge vessel containing a gas filling with a metal chelate complex composed of a central metal ion and at least one bivalent or multivalent ligand and with a buffer gas, with internal or external electrodes, and with means for generating and maintaining a low-pressure gas discharge.
  • a molecular gas discharge at low pressure takes place which generates radiation in the visible blue and adjacent UVA range of the electromagnetic spectrum. Since the radiation is that of a molecular discharge, the exact position of the continuum is controllable through the nature of the metal chelate complex, possible further additives, as well as through the pressure inside the lamp and the operating temperature.
  • the lamp according to the invention when combined with phosphors has a luminous efficacy which is considerably higher than that of conventional low-pressure discharge lamps that contain mercury.
  • the luminous efficacy expressed in lumens/watt is the ratio of the brightness of the radiation in a given visible wavelength range to the energy used for generating the radiation.
  • the high luminous efficacy of the lamp according to the invention means that a given quantity of light will be realized with a lower power consumption.
  • the lamp according to the invention is its use as a UV-A lamp for sun couches, disinfection luminaires, and paint curing installations.
  • the lamp is provided with suitable phosphors for general lighting purposes. Since the losses caused by the Stokesian shift are low, visible light is obtained with a high luminous efficacy of more than 100 lumens/watt.
  • the central metal ion of the metal chelate complex is chosen from among the bivalent ions of chromium, cobalt, copper, nickel, and iron.
  • the ligands of the metal chelate complex are chosen from phthalocyanine compounds, azo compounds, azomethine compounds, isoindolinone compounds, azoic compounds, anthrachinone compounds, caratenoid compounds, quinoline compounds, xanthene compounds, diarylmethane compounds, triarylmethane compounds, stilbene compounds, indigoid compounds, and nitro compounds. It is particularly preferred that the metal chelate complex is copper phthalocyanine.
  • a further improved efficiency can be achieved if the gas filling contains a mixture of two or more metal chelate complexes.
  • the gas filling may contain a rare gas chosen from the group of helium, neon, argon, krypton, and xenon as the buffer gas. It may be preferred in the context of the present invention that the gas discharge vessel comprises a phosphor layer on its outer surface.
  • the UVA radiation generated by the low-pressure gas discharge lamp according to the invention is not absorbed by usual glass types, but passes through the walls of the discharge vessel substantially without losses.
  • the phosphor layer may accordingly be provided on the outside of the gas discharge vessel. This simplifies the manufacturing process.
  • the gas discharge vessel has a phosphor layer on its inner surface.
  • Fig. 1 diagrammatically shows the light generation in a low-pressure gas discharge with a gas filling comprising copper phthalocyanine.
  • the low-pressure gas discharge lamp comprises a tubular lamp bulb 1 which surrounds a discharge space. Electrodes 2 are fused into the inside at both ends of the tube, by means of which electrodes the gas discharge can be ignited.
  • the low-pressure gas discharge lamp further comprises an electrical driver circuit which controls the ignition and operation of the gas discharge lamp in a known manner.
  • the gas discharge vessel may alternatively be constructed as a multiply folded or spiraling tube, or may be surrounded by an outer bulb.
  • the wall of the gas discharge vessel is preferably made from a type of glass, quartz, aluminum oxide, or yttrium-aluminum garnet.
  • the gas filling is formed by a metal chelate complex ML2 in a quantity of 2x10 " ' ' mole/cm 3 to 2xl0 "9 mole/cm 3 and a rare gas.
  • the rare gas serves as a buffer gas and facilitates the ignition of the gas discharge.
  • a preferred buffer gas is argon.
  • Argon may be wholly or partly replaced with a different rare gas such as helium, neon, krypton, or xenon.
  • the metal chelate complexes suitable for the invention are metal chelate complex coloring agents and metal chelate complex pigments. They comprise a central metal ion, predominantly a bivalent metal cation with the coordination number 4, and bivalent or multivalent ligands which are bound to the metal ion in a chelate arrangement.
  • Eligible ligands are the known chromophores such as, for example, azo, azoic, anthrachinone, caratenoid, quinoline, xanthene, diarylmethane, triarylmethane, stilbene, Indigoid, phthalocyanine, and nitro compounds, as well as all further known chromophores as listed in the Color Index under Cl 11000 to Cl 77999 and capable of forming a chelate compound.
  • Preferred ligands are azo compounds and phthalocyanines whose oxygen or nitrogen atoms take part in the chelate bonds.
  • the complexes may be 1 : 1 or 1 :2 complexes.
  • the free coordination locations are occupied by monovalent ligands such as water or hydroxide ions.
  • Central metal ions for the metal chelate complexes preferred for the invention are bivalent ions chosen from the bivalent ions of chromium, cobalt, copper, nickel, and iron.
  • a particularly preferred metal chelate complex is copper phthalocyanine or a derivative of copper phthalocyanine such as, for example, copper-
  • a possibility of enhancing the luminous efficacy is offered by a combination of two or more metal chelate complexes in the gas atmosphere.
  • the efficacy may be further improved when the inner operational pressure of the lamp is optimized.
  • the cold filling pressure of the buffer gas is an optimum when the product of the cold filling pressure of the rare gas p and the smallest diameter of the gas discharge vessel d complies with the requirement: 0.2 mbar cm ⁇ p.d ⁇ 20 mbar cm.
  • a further advantageous measure for increasing the luminous efficacy of the low-pressure gas discharge lamp was found to be the control of the operating temperature of the lamp through suitable constructional measures, such that, during operation at an ambient temperature of 25 °C, an interior temperature corresponding to T* ⁇ 50 [K] achieved.
  • the interior temperature T* relates to the coldest spot in the gas discharge vessel.
  • the gas discharge vessel may also be surrounded by an outer bulb coated with an IR radiation reflecting layer so as to raise the interior temperature.
  • the infrared radiation reflecting coating is preferably made of indium-doped tin oxide.
  • a suitable material for the electrodes in the low-pressure gas discharge lamp according to the invention is, for example, nickel or a nickel alloy, or a refractive metal, in particular tungsten and tungsten alloys, in particular tungsten alloys with rhenium. Composite materials of tungsten with thorium oxide or indium oxide are also suitable.
  • the electrodes may be coated with a material having a low work function.
  • the gas discharge vessel of the lamp is coated with a phosphor layer 4 on its outer surface.
  • the emitted UV radiation of the gas discharge excites the phosphors in the phosphor layer into emission of light in the visible range 5.
  • the chemical composition of the phosphor layer determines the spectrum of the light, i.e. its color characteristics.
  • Materials eligible as phosphors must absorb the generated radiation and emit in a suitable wavelength range, for example for the three primary colors red, blue, and green, and must reach a high fluorescent quantum efficiency.
  • Suitable phosphors and phosphor combinations need not be provided on the inner surface of the gas discharge vessel, but they may be provided on the outer surface because the generated radiation in the UVA range is not absorbed by the usual glass types.
  • the lamp is capacitively excited by a high- frequency field with a frequency of, for example, 2.65 MHz, 13.56 MHz, or 2.4 GHz, while the electrodes are provided at the exterior of the gas discharge vessel.
  • the lamp is inductively excited by a high-frequency field with a frequency of, for example, 2.65 MHz, 13.56 MHz, or 2.4 GHz.
  • the electrons emitted by the electrodes excite the atoms and molecules of the gas filling into generation of characteristic UV radiation and a molecular continuum.
  • the discharge heats up the gas filling such that the desired vapor pressure and desired operating temperature, at which the luminous efficacy is an optimum, are achieved.
  • the radiation generated by the gas filling with metal chelate complexes during operation exhibits not only the line spectrum of the central metal ions but also an intensive, wide, continuous molecular spectrum which is caused by molecular discharge of the complex.
  • the range of maximum emission of the continuous molecular spectrum usually shifts to greater wavelengths as the molecular weight of the metal chelate complex rises.
  • a cylindrical discharge vessel made of a glass permeable to UVA radiation with a length of 14 cm and a diameter of 2.5 cm is provided with external electrodes of copper.
  • the discharge vessel is evacuated while at the same time 0.3 mg copper phthalocyanine is introduced.
  • Argon is also introduced with a cold filling pressure of 5 mbar.
  • An alternating current with a frequency of 13.65 MHz is supplied by an external AC source, and the luminous efficacy is measured at an operating temperature of 433 °C.
  • the luminous efficacy is 100 lm/W.

Abstract

A low-pressure gas discharge lamp provided with a gas discharge vesseL (1) containing a gas filling with a metal chelate complex (ML2) of a central metal ion and at least one bivalent or multivalent ligand and with a buffer gas, with internal or external electrodes (2), and with means for generating and maintaining a low-pressure gas discharge.

Description

Low-pressure gas discharge lamp with mercury-free gas filling
The invention relates to a low-pressure gas discharge lamp provided with a gas discharge vessel containing a gas filling, with electrodes, and with means for generating and maintaining a low-pressure gas discharge.
The light generation in low-pressure gas discharge lamps is based on the fact that charge carriers, in particular electrons, but also ions are accelerated by an electric field between the electrodes of the lamp so strongly that they excite or ionize the gas atoms or molecules of the gas filling owing to collisions in the gas filling of the lamp. When the atoms or molecules of the gas filling fall back into their ground state, a larger or smaller portion of the excitation energy is converted into radiation. Conventional low-pressure gas discharge lamps contain mercury in their gas fillings and in addition comprise a phosphor layer on the inside of the gas discharge vessel.
It is a disadvantage of the mercury low-pressure gas discharge lamps that mercury vapor generates primarily radiation in the high-energy, but invisible UV-C region of the electromagnetic spectrum, which radiation is to be converted first into the visible, substantially lower-energy radiation by the phosphors. The energy difference is converted into undesirable heat radiation during this.
The mercury in the gas filling is also increasingly regarded as an environmentally hazardous and toxic substance which is to be avoided as much as possible in modern mass manufacture because of its environmental risks during use, manufacture, and disposal.
It is known to influence the spectrum of low-pressure gas discharge lamps in that the mercury in the gas filling is replaced by other substances. A low-pressure gas discharge lamp is known, for example, from GB 2 014 358 A, which comprises a discharge vessel, electrodes, and a filling comprising at least one copper halide as the UV emitter. This low-pressure gas discharge lamp containing copper halide emits in the visible range as well as in the UV range at 324.75 and 327.4 nm.
It is an object of the present invention to provide a low-pressure gas discharge lamp whose radiation lies as close as possible to the visible range of the electromagnetic spectrum. According to the invention, the object is achieved by means of a low-pressure gas discharge lamp which is provided with a gas discharge vessel containing a gas filling with a metal chelate complex composed of a central metal ion and at least one bivalent or multivalent ligand and with a buffer gas, with internal or external electrodes, and with means for generating and maintaining a low-pressure gas discharge.
In the lamp according to the invention, a molecular gas discharge at low pressure takes place which generates radiation in the visible blue and adjacent UVA range of the electromagnetic spectrum. Since the radiation is that of a molecular discharge, the exact position of the continuum is controllable through the nature of the metal chelate complex, possible further additives, as well as through the pressure inside the lamp and the operating temperature.
The lamp according to the invention when combined with phosphors has a luminous efficacy which is considerably higher than that of conventional low-pressure discharge lamps that contain mercury. The luminous efficacy expressed in lumens/watt is the ratio of the brightness of the radiation in a given visible wavelength range to the energy used for generating the radiation. The high luminous efficacy of the lamp according to the invention means that a given quantity of light will be realized with a lower power consumption.
In addition, the use of mercury is avoided. An advantageous application of the lamp according to the invention is its use as a UV-A lamp for sun couches, disinfection luminaires, and paint curing installations. The lamp is provided with suitable phosphors for general lighting purposes. Since the losses caused by the Stokesian shift are low, visible light is obtained with a high luminous efficacy of more than 100 lumens/watt. It may be preferred in the context of the present invention that the central metal ion of the metal chelate complex is chosen from among the bivalent ions of chromium, cobalt, copper, nickel, and iron.
It may be preferred in the context of the present invention that the ligands of the metal chelate complex are chosen from phthalocyanine compounds, azo compounds, azomethine compounds, isoindolinone compounds, azoic compounds, anthrachinone compounds, caratenoid compounds, quinoline compounds, xanthene compounds, diarylmethane compounds, triarylmethane compounds, stilbene compounds, indigoid compounds, and nitro compounds. It is particularly preferred that the metal chelate complex is copper phthalocyanine.
Particularly advantageous effects are achieved in comparison with the prior art if the gas filling contains copper phthalocyanine. A gas discharge with a wide continuous spectrum is obtained.
A further improved efficiency can be achieved if the gas filling contains a mixture of two or more metal chelate complexes.
The gas filling may contain a rare gas chosen from the group of helium, neon, argon, krypton, and xenon as the buffer gas. It may be preferred in the context of the present invention that the gas discharge vessel comprises a phosphor layer on its outer surface. The UVA radiation generated by the low-pressure gas discharge lamp according to the invention is not absorbed by usual glass types, but passes through the walls of the discharge vessel substantially without losses. The phosphor layer may accordingly be provided on the outside of the gas discharge vessel. This simplifies the manufacturing process.
It may alternatively be preferred that the gas discharge vessel has a phosphor layer on its inner surface.
The invention will be explained in more detail below with reference to a Figure and an embodiment. Fig. 1 diagrammatically shows the light generation in a low-pressure gas discharge with a gas filling comprising copper phthalocyanine.
In the embodiment shown in Fig. 1 , the low-pressure gas discharge lamp according to the invention comprises a tubular lamp bulb 1 which surrounds a discharge space. Electrodes 2 are fused into the inside at both ends of the tube, by means of which electrodes the gas discharge can be ignited. The low-pressure gas discharge lamp further comprises an electrical driver circuit which controls the ignition and operation of the gas discharge lamp in a known manner.
The gas discharge vessel may alternatively be constructed as a multiply folded or spiraling tube, or may be surrounded by an outer bulb. The wall of the gas discharge vessel is preferably made from a type of glass, quartz, aluminum oxide, or yttrium-aluminum garnet.
In the simplest case, the gas filling is formed by a metal chelate complex ML2 in a quantity of 2x10"' ' mole/cm3 to 2xl0"9 mole/cm3 and a rare gas. The rare gas serves as a buffer gas and facilitates the ignition of the gas discharge. A preferred buffer gas is argon. Argon may be wholly or partly replaced with a different rare gas such as helium, neon, krypton, or xenon.
The metal chelate complexes suitable for the invention are metal chelate complex coloring agents and metal chelate complex pigments. They comprise a central metal ion, predominantly a bivalent metal cation with the coordination number 4, and bivalent or multivalent ligands which are bound to the metal ion in a chelate arrangement.
Eligible ligands are the known chromophores such as, for example, azo, azoic, anthrachinone, caratenoid, quinoline, xanthene, diarylmethane, triarylmethane, stilbene, Indigoid, phthalocyanine, and nitro compounds, as well as all further known chromophores as listed in the Color Index under Cl 11000 to Cl 77999 and capable of forming a chelate compound.
Preferred ligands are azo compounds and phthalocyanines whose oxygen or nitrogen atoms take part in the chelate bonds.
Depending on the number of ligands per metal ion, the complexes may be 1 : 1 or 1 :2 complexes. In the case of 1 : 1 complexes, the free coordination locations are occupied by monovalent ligands such as water or hydroxide ions.
Central metal ions for the metal chelate complexes preferred for the invention are bivalent ions chosen from the bivalent ions of chromium, cobalt, copper, nickel, and iron.
A particularly preferred metal chelate complex is copper phthalocyanine or a derivative of copper phthalocyanine such as, for example, copper-
1 ,2,3 ,4,8,9, 10, 11 , 15 , 16, 17, 18,22,23,24,25- hexadecachloro-29H,31 H-phthalocyanine, copper-1,2,3,4,8,9,10,11,15,16,17,18, 22,23,24,25-hexadecabromo-29H,31H- phthalocyanine, or copperphthalocyanine derivatives with different kinds and numbers of halogen atoms in the substitution locations of the four benzene rings. These metal chelate complex compounds, in particular phthalocyanine itself, are temperature-stable, withstand the rigid process conditions during manufacture of a low-pressure gas discharge lamp, and have a high emission in the region of visible blue and the adjacent UV, depending on the substitution.
A possibility of enhancing the luminous efficacy is offered by a combination of two or more metal chelate complexes in the gas atmosphere. The efficacy may be further improved when the inner operational pressure of the lamp is optimized. The cold filling pressure of the buffer gas is an optimum when the product of the cold filling pressure of the rare gas p and the smallest diameter of the gas discharge vessel d complies with the requirement: 0.2 mbar cm < p.d < 20 mbar cm. A further advantageous measure for increasing the luminous efficacy of the low-pressure gas discharge lamp was found to be the control of the operating temperature of the lamp through suitable constructional measures, such that, during operation at an ambient temperature of 25 °C, an interior temperature corresponding to T* ± 50 [K] achieved. The interior temperature T* relates to the coldest spot in the gas discharge vessel.
The gas discharge vessel may also be surrounded by an outer bulb coated with an IR radiation reflecting layer so as to raise the interior temperature. The infrared radiation reflecting coating is preferably made of indium-doped tin oxide.
A suitable material for the electrodes in the low-pressure gas discharge lamp according to the invention is, for example, nickel or a nickel alloy, or a refractive metal, in particular tungsten and tungsten alloys, in particular tungsten alloys with rhenium. Composite materials of tungsten with thorium oxide or indium oxide are also suitable. The electrodes may be coated with a material having a low work function.
In the embodiment of Fig. 1, the gas discharge vessel of the lamp is coated with a phosphor layer 4 on its outer surface. The emitted UV radiation of the gas discharge excites the phosphors in the phosphor layer into emission of light in the visible range 5.
The chemical composition of the phosphor layer determines the spectrum of the light, i.e. its color characteristics. Materials eligible as phosphors must absorb the generated radiation and emit in a suitable wavelength range, for example for the three primary colors red, blue, and green, and must reach a high fluorescent quantum efficiency. Suitable phosphors and phosphor combinations need not be provided on the inner surface of the gas discharge vessel, but they may be provided on the outer surface because the generated radiation in the UVA range is not absorbed by the usual glass types. In an alternative embodiment, the lamp is capacitively excited by a high- frequency field with a frequency of, for example, 2.65 MHz, 13.56 MHz, or 2.4 GHz, while the electrodes are provided at the exterior of the gas discharge vessel.
In a further embodiment, the lamp is inductively excited by a high-frequency field with a frequency of, for example, 2.65 MHz, 13.56 MHz, or 2.4 GHz.
When the lamp is being ignited, the electrons emitted by the electrodes excite the atoms and molecules of the gas filling into generation of characteristic UV radiation and a molecular continuum.
The discharge heats up the gas filling such that the desired vapor pressure and desired operating temperature, at which the luminous efficacy is an optimum, are achieved. The radiation generated by the gas filling with metal chelate complexes during operation exhibits not only the line spectrum of the central metal ions but also an intensive, wide, continuous molecular spectrum which is caused by molecular discharge of the complex. The range of maximum emission of the continuous molecular spectrum usually shifts to greater wavelengths as the molecular weight of the metal chelate complex rises.
Embodiment 1
A cylindrical discharge vessel made of a glass permeable to UVA radiation with a length of 14 cm and a diameter of 2.5 cm is provided with external electrodes of copper. The discharge vessel is evacuated while at the same time 0.3 mg copper phthalocyanine is introduced. Argon is also introduced with a cold filling pressure of 5 mbar. An alternating current with a frequency of 13.65 MHz is supplied by an external AC source, and the luminous efficacy is measured at an operating temperature of 433 °C. The luminous efficacy is 100 lm/W.

Claims

CLAIMS:
1. A low-pressure gas discharge lamp which is provided with a gas discharge vessel containing a gas filling with a metal chelate complex composed of a central metal ion and at least one bivalent or multivalent ligand and with a buffer gas, with internal or external electrodes, and with means for generating and maintaining a low-pressure gas discharge.
2. A low-pressure gas discharge lamp as claimed in claim 1, characterized in that the central metal ion of the metal chelate complex is chosen from among the bivalent ions of chromium, cobalt, copper, nickel, and iron.
3. A low-pressure gas discharge lamp as claimed in claim 1, characterized in that the ligands of the metal chelate complex are chosen from phthalocyanine compounds, azo compounds, azomethine compounds, isoindolinone compounds, azoic compounds, anthrachinone compounds, caratenoid compounds, Quinoline compounds, xanthene compounds, diarylmethane compounds, triarylmethane compounds, stilbene compounds, indigoid compounds, and nitro compounds.
4. A low-pressure gas discharge lamp as claimed in claim 1, characterized in that the metal chelate complex is copper phthalocyanine.
5. A low-pressure gas discharge lamp as claimed in claim 1, characterized in that the gas filling contains a mixture of two or more metal chelate complexes.
6. A low-pressure gas discharge lamp as claimed in claim 1, characterized in that the gas filling comprises a rare gas chosen from the group of helium, neon, argon, krypton, and xenon as the buffer gas.
7. A low-pressure gas discharge lamp as claimed in claim 1, characterized in that the gas discharge vessel has a phosphor layer on its outer surface.
8. A low-pressure gas discharge lamp as claimed in claim 1, characterized in that the gas discharge vessel has a phosphor layer on its inner surface.
PCT/IB2003/005212 2002-11-23 2003-11-17 Low-pressure gas discharge lamp with mercury-free gas filling WO2004049387A2 (en)

Priority Applications (1)

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DE10254737.8 2002-11-23
DE2002154737 DE10254737A1 (en) 2002-11-23 2002-11-23 Low pressure gas discharge lamp with mercury-free gas filling

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WO2004049387A3 WO2004049387A3 (en) 2005-07-28

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006068887A2 (en) * 2004-12-20 2006-06-29 General Electric Company Mercury-free and sodium-free compositions and radiation sources incorporating same
US7825598B2 (en) 2004-12-20 2010-11-02 General Electric Company Mercury-free discharge compositions and lamps incorporating Titanium, Zirconium, and Hafnium

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05251056A (en) * 1991-09-24 1993-09-28 Matsushita Electric Works Ltd Electrodeless discharge lamp

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 018, no. 003 (E-1485), 6 January 1994 (1994-01-06) & JP 05 251056 A (MATSUSHITA ELECTRIC WORKS LTD), 28 September 1993 (1993-09-28) *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006068887A2 (en) * 2004-12-20 2006-06-29 General Electric Company Mercury-free and sodium-free compositions and radiation sources incorporating same
WO2006068887A3 (en) * 2004-12-20 2007-05-24 Gen Electric Mercury-free and sodium-free compositions and radiation sources incorporating same
US7825598B2 (en) 2004-12-20 2010-11-02 General Electric Company Mercury-free discharge compositions and lamps incorporating Titanium, Zirconium, and Hafnium
US7847484B2 (en) 2004-12-20 2010-12-07 General Electric Company Mercury-free and sodium-free compositions and radiation source incorporating same

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DE10254737A1 (en) 2004-06-09
AU2003276577A8 (en) 2004-06-18
WO2004049387A3 (en) 2005-07-28

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