WO2003075314A1 - Device for generating uv radiation - Google Patents

Device for generating uv radiation Download PDF

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Publication number
WO2003075314A1
WO2003075314A1 PCT/IB2003/000711 IB0300711W WO03075314A1 WO 2003075314 A1 WO2003075314 A1 WO 2003075314A1 IB 0300711 W IB0300711 W IB 0300711W WO 03075314 A1 WO03075314 A1 WO 03075314A1
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WO
WIPO (PCT)
Prior art keywords
discharge
ultraviolet radiation
generating ultraviolet
phosphor
radiation
Prior art date
Application number
PCT/IB2003/000711
Other languages
French (fr)
Inventor
Thomas JÜSTEL
Heinrich Von Busch
Gero Heusler
Walter Mayr
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 US10/506,288 priority Critical patent/US7298077B2/en
Priority to EP03704854A priority patent/EP1483777B1/en
Priority to DE60326940T priority patent/DE60326940D1/en
Priority to JP2003573674A priority patent/JP2005519438A/en
Priority to AU2003207380A priority patent/AU2003207380A1/en
Publication of WO2003075314A1 publication Critical patent/WO2003075314A1/en

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Classifications

    • 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
    • H01J65/046—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 the field being produced by using capacitive means around the vessel
    • 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
    • C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
    • C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
    • C09K11/7766—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals
    • C09K11/7777—Phosphates
    • 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
    • C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
    • C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
    • C09K11/7766—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals
    • C09K11/778—Borates

Definitions

  • the invention relates to a device for generating electromagnetic radiation, which device is equipped with an at least partly transparent discharge vessel whose discharge space is filled with a gas filling, with means for triggering and maintaining an excimer discharge in the discharge space, and with a coating that contains a phosphor.
  • Radiation sources of this kind are suitable, depending on the spectrum of the radiation emitted, for general and auxiliary lighting, e.g. domestic and office lighting, for the back-lighting of displays, e.g. liquid crystal displays, for traffic lights and signal lighting, and for photochemical processes, e.g. sterilization and photolysis.
  • the devices concerned are in particular ones of the kind known from EP 1048 620 for the disinfection of water.
  • a disadvantage of the devices described in EP 1048 620 is that the optical efficiency achieved is low for photolytic applications.
  • photolytic processes radiation having a very high photon energy is absorbed by certain organic molecules, and the chemical C-C and C-O bonds, for example, in the molecules are severed.
  • Photolytic processes are used for example to produce very pure water, for the dry cleaning of surfaces, for the curing of polymers, and similar applications.
  • this object is achieved by a device for generating ultraviolet radiation by means of an excimer discharge, which device is equipped with an at least partly UN-transparent discharge vessel whose discharge space is filled with a gas filling, with means for triggering and maintaining an excimer discharge in the discharge space, and with a coating that contains a phosphor comprising a host lattice and neodymium(III) as an activator.
  • a device of this kind converts the primary radiation generated by the excimer discharge into radiation having a maximum emission at a wavelength of between 180 and 250 nm. Radiation in this wavelength range has a high photon energy and breaks even strong chemical bonds such as single C-C or C-O bonds. It is, therefore, suitable for use in photolytic processes such as are used for producing very pure water, in the dry cleaning of surfaces, the curing of polymers and similar applications.
  • the maximum emission lies in the range between 180 and 250 nm that encourages photolytic reactions, and has a high depth of penetration into water and other solvents.
  • the phosphor contains praseodymium(III) as a co-activator.
  • the phosphor is preferred for the phosphor to be selected from the group (La ⁇ - x Y x )PO :Nd where 0 ⁇ x ⁇ 1, (La,- x Y x )PO 4 :Nd,Pr where 0 ⁇ x ⁇ 1, SrAl, 2 O ⁇ 9 :Nd, LaBO 3 O 6 :Nd, LaMgB 5 O ⁇ o:Nd, SrAl, 2 O I9 :Nd,Pr, LaBO 3 O 6 :Nd,Pr, LaMgB 5 O ⁇ 0 :Nd,Pr and GdPO 4 :Nd. It may also be preferred for the phosphor to comprise a coating that contains an oxide selected from the group MgO, SiO 2 and Al 2 O 3 .
  • the gas filling contains a gas selected from the group xenon, krypton, argon, neon and helium.
  • the gas filling prefferably contains xenon.
  • a xenon- excimer discharge shows particularly efficient NUN generation with a maximum at 172 ⁇ 3.5 nm, more than 80% of which is converted by the ⁇ d(III)-activated phosphors.
  • the electrodes may be composed of a metal or alloy that reflects UV-C light.
  • Part of the discharge vessel may be provided with a coating that acts as a reflector of NUN and UN-C light.
  • the invention also relates to the use of the device for photolytic processes.
  • Fig. 1 shows a first design of device for generating ultraviolet radiation, having a concentric electrode.
  • Fig. 2 shows a first design of device for generating ultraviolet radiation, having a concentric electrode, in cross-section.
  • Fig. 3 shows a second design of device for generating ultraviolet radiation, of the co-axial type.
  • Fig. 4 shows a second design of device for generating ultraviolet radiation, of the co-axial type, in cross-section.
  • Fig. 5 shows a third design of device for generating ultraviolet radiation, of the tubular type.
  • Fig. 6 shows a third design of device for generating ultraviolet radiation, of the tubular type, in cross-section.
  • Fig. 7 shows a fourth design of device for generating ultraviolet radiation, having buried electrodes.
  • Fig. 8 shows a fourth design of device for generating ultraviolet radiation, having buried electrodes, in cross-section.
  • Fig. 9 shows a fifth design of device for generating ultraviolet radiation, having UN reflectors.
  • Fig. 10 shows a fifth design of device for generating ultraviolet radiation, having UN reflectors, in cross-section.
  • Fig. 11 shows a sixth design of device for generating ultraviolet radiation, employing corona discharge, in cross-section.
  • Fig. 12 shows a sixth design of device for generating ultraviolet radiation, employing corona discharge, in plan.
  • Fig. 13 shows a seventh design of device for generating ultraviolet radiation, in the form of a flat lamp.
  • Fig. 14 shows a seventh design of device for generating ultraviolet radiation, in the form of a flat lamp, in cross-section.
  • Fig. 15 is a chart showing an illustrative calculation of the efficiency with which UN fluorescent radiation of around 200 nm is generated from the primary radiation from an Xe-excimer discharge.
  • the device according to the invention for generating ultraviolet radiation by means of an excimer discharge is equipped with an at least partly UN-transparent discharge vessel whose discharge space is filled with a gas filling, and with a coating that comprises a phosphor that contains a host lattice and neodymium(III) as an activator.
  • the device is also equipped with means for triggering and maintaining the excimer discharge.
  • the discharge vessel such as plates, single tubes, co-axial tubes, and discharge tubes that are straight, U-shaped, curved or coiled in a circle, cylindrical or of other shapes.
  • a typical design for a device for photolytic reactions is that shown in Figs. 1 and 2.
  • this design comprises amongst other things electrodes of first and second types.
  • a coiled wire is inserted in the gas-discharge vessel 100 concentrically thereto. This wire forms the first, inner electrode 301 of the device.
  • the outside of the glass is covered with a small- mesh wire mesh that forms the second, outer electrode 302.
  • the discharge vessel is sealed with a gas-tight seal. The space within it is filled with xenon or a gas containing xenon.
  • the two electrodes are connected to the two poles of an a.c. power source.
  • the electrode geometry, together with the pressure in the discharge vessel and the composition of the gas, is matched to the characteristics of the a.c. power source.
  • the discharge vessel 100 comprises two co-axial bodies made of glass that are connected together in a gas- tight manner to form a hollow sleeve.
  • the annular gap between the two co-axial bodies of glass forms the discharge space 200 and is filled with xenon or a gas containing xenon.
  • the fluid medium to be treated may flow through the inner tube, to the inner wall of which a transparent electrode 301 of the first kind is applied.
  • the medium to be treated may also be situated outside the outer tube.
  • the outside of the glass is covered with a small-mesh wire mesh that forms the second, outer electrode 302.
  • the power supply is provided by an a.c. power source connected to these two electrodes.
  • FIGs. 5 and 6 Another typical and easily produced design is shown in Figs. 5 and 6.
  • a flat lamp is particularly suitable for the dry cleaning of surfaces and for curing paint finishes.
  • the electrodes are mounted on the inside of the wall of the gas-discharge vessel and are separated from the gas discharge space 200 by a covering layer 102 of a dielectric material.
  • This dielectric covering layer 102 preferably comprises glass solder.
  • the material used for the discharge vessel is preferably quartz or types of glass that are permeable to UN-C and VUN radiation.
  • the means of triggering and maintaining an excimer discharge comprise electrodes of first and second kinds.
  • electrodes of the first and second kinds are arranged on the wall of the discharge vessel to generate a dielectrically inhibited discharge, with at least one electrode being separated from the discharge space by a dielectric material.
  • a silent electric discharge is triggered in the filling gas when a suitable a.c. voltage is applied.
  • a discharge of the corona type is triggered in the filling gas when a suitable d.c. or a.c. voltage is applied to the electrodes.
  • the electrodes are composed of a metal, e.g. aluminum or silver, a metal alloy, or a transparent conductive inorganic compound, e.g. ITO. They may take the form of a coating, a bonded-on foil, strips of bonded-on foil, a wire or a wire mesh.
  • a transparent electrolyte e.g. water
  • electrodes of first and second kinds are arranged on the wall of the discharge vessel to generate a corona discharge.
  • part of the discharge vessel may be provided with a coating that acts as a reflector 400 of NUN and UN-C light.
  • UN reflectors are preferably used for designs as shown in Figs.9 or 10 in order to increase the inward or outward radiation by means of a surface.
  • Metal surfaces which are provided with a protective layer transparent to UN where required, are suitable for use as reflectors of radiation in the UN-C or NUN range.
  • An aluminum foil coated with magnesium fluoride is suitable, for example.
  • Another suitable form of coating that acts as a reflector is a coating that contains particles of a material selected from the group MgO, SiO 2 , AI 2 O 3 , (La ⁇ - x Y x )PO where 0 ⁇ x ⁇ 1, (La ⁇ - x Y x )PO 4 where 0 ⁇ x ⁇ 1, SrAl ⁇ 2 O
  • the discharge vessel is preferably filled with oxygen-free xenon or a mixture of gases that contains xenon, because there is a substantial concentration of the electron energy distribution of an excimer discharge in a xenon-containing atmosphere in the region of the first Xe excitation energy at 8.4 eN and this distribution is thus ideally matched to the formation of Xe 2 excimers and, as a result of the emission of the latter in the wavelength range between 160 and 190 nm, to the excitation of neodymium-containing phosphors.
  • the inner wall of the discharge vessel is wholly or partly covered with a coating 101 that contains the phosphor.
  • the coating may also contain an organic or inorganic binder or binder composition.
  • the phosphor layer may be protected against attack by the discharge by means of a protective layer.
  • the phosphor comprises a host lattice that is doped with a few percent of an activator.
  • the ⁇ d 3+ -activated phosphors that are used in accordance with the invention are principally phosphors having a host lattice that exerts a weak ligand field.
  • What are particularly suitable are inorganic, oxygen-containing host lattices composed of oxides, aluminates, gallates, phosphates, borates or silicates.
  • a high co-ordination number in these host lattices also reduces the crystal-field splitting of the neodymium d-orbitals that play a part in the optical transitions.
  • the ⁇ d 3+ ion generally shows wide absorption bands in the ultraviolet, sometimes extending into the blue, in the various host lattices.
  • the emission bands of the phosphors according to the invention are situated in the range from the deep ultraviolet to the yellow-orange, with an emission maximum at a wavelength between 180 and 250 nm, i.e. in the UC-C and NUN range.
  • the extinction temperature of these phosphors is above 100°C.
  • What may also be particularly preferred are phosphors that contain praseodymium, such as (La ⁇ .
  • a silent electrical discharge is triggered in the filling gas, which is preferably xenon-containing.
  • the filling gas which is preferably xenon-containing.
  • the UN photons generated are absorbed by the phosphors and the excitation energy is emitted again partly in the longer wavelength range of the spectrum.
  • the absorption co-efficient of the phosphors activated with ⁇ d or with ⁇ d and Pr is particularly high for wavelengths in the xenon-radiation range and the quantum yield is high.
  • the host lattice affects the exact position of the energy level of the activator ion and hence the emission spectrum.
  • the phosphors are produced by a solid-state reaction from the starting compounds, in the form of fine-grained powders having a grain-size distribution of between 1 and 10 ⁇ m. They are applied to the walls of the discharge vessel by a flow coating process.
  • the coating suspensions for the flow coating process contain water or an organic compound such as butyl acetate as a solvent. The suspension is stabilized, and its rheological properties acted on, by adding aids such as stabilizers, liquefiers and cellulose derivatives.
  • the phosphor suspension is applied to the walls of the vessel as a thin film, dried and fired on at 600°C.
  • the vessel is then evacuated to remove all gaseous contaminants and particularly oxygen.
  • the vessel is then filled with xenon at a pressure of approximately 200 to 300 mbar and sealed.
  • the devices described are highly suitable for high-yield photolytic reactors. Because the spectrum of the radiation emitted is confined to a narrow band, the device according to the invention may advantageously be employed to carry out wavelength- selective photoreactions. Table 1 shows the absorption edges of certain widely used solvents
  • Industrial photochemical processes e.g. photo-chlorination, photo- bromination, photo-sulfochlorination
  • photo-chlorination e.g. photo-chlorination, photo- bromination, photo-sulfochlorination
  • photo-sulfochlorination e.g. photo-chlorination, photo- bromination, photo-sulfochlorination
  • the device according to the invention may also be used for sterilizing other liquids and solvents.
  • the medium to be treated may be conducted past the outside face of the radiant source.
  • this design may, for example, be used for the cleaning of surfaces in the dry state.
  • the reacting medium may be conducted past the inner and/or outer face of the radiant source.
  • the electrode adjacent the axis of the lamp must be transparent or perforated. This design can be used to destroy solvent residues in water or air or other gases.
  • an overall efficiency of 26.6%> can be achieved for a driver efficiency of 65% a plasma efficiency for the xenon excimer discharge of 60%>, a quantum conversion efficiency on the part of the phosphor of 90%>, a Stokes shift of 85%> and a transmission by the material of the gas discharge vessel of 89%. This is more than three times the efficiency of a mercury NUN lamp.
  • a suspension of LaPO 4 :Nd in butyl acetate with nitrocellulose as a binder is produced.
  • the phosphor suspension is applied to the inner wall of a tube of synthetic quartz (SuprasilTM) with an inside diameter of 5 mm by a flow coating process.
  • the thickness of the phosphor layer corresponds to a weight per unit area for the phosphor of 3 mg/cm .
  • the binder is burnt off at a temperature below 580°C.
  • the device is filled with xenon at a pressure of 200 to 300 mbar and then sealed. Any contamination by oxygen must be carefully avoided.
  • Two electrodes of aluminum foil are bonded diagonally to the outer wall of the device.
  • the device is operated by a.c. current having a square-wave characteristic, an amplitude of 6 kV and a frequency of 25 kHz.
  • EMBODIMENT 2 The discharge vessel of the device in example of implementation 2 comprises a cylindrical tube of synthetic quartz (SuprasilTM) measuring 0.7 mm in thickness and 50 mm in diameter. It is filled with xenon at a pressure of 200 mbar. An inner electrode of metal wire coiled in a spiral is arranged on the axis of the tube. Six strips of silver foil are bonded to the outer wall of the discharge vessel parallel to the inner electrode to form the outer electrode. The inner surface of the outer wall is coated with a layer of phosphor that contains YPO 4 :Nd as a phosphor.
  • the device is operated by a.c. current having a square-wave characteristic, an amplitude of 6 kV and a frequency of 25 kHz.
  • EMBODIMENT 3 The discharge vessel of the device in example 3 comprises two co-axial tubes of synthetic quartz (SuprasilTM) measuring 0.7 mm in thickness, and 50 mm in inside diameter and 40 mm in outside diameter respectively. The two tubes are so connected together at both ends as to form a gas-tight hollow sleeve. This is filled with xenon at a pressure of 200 mbar.
  • the wall of the hollow sleeve adjacent the axis of the tubes is coated with a layer of aluminum that forms the first electrode and on the side remote from the axis of the tubes six strips of silver foil are bonded to the wall of the hollow sleeve remote from the axis of the tubes, parallel to the axis of the tubes, these strips forming the second electrode.
  • the inner surfaces of the hollow sleeve are coated with a layer of phosphor that contains LaPO 4 :Nd as a phosphor.
  • the device is operated by a.c. current having a square-wave characteristic, an amplitude of 6 kV and a frequency of 25 kHz.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Plasma & Fusion (AREA)
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  • Materials Engineering (AREA)
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  • Vessels And Coating Films For Discharge Lamps (AREA)
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Abstract

The invention relates to a device for generating ultraviolet radiation by means of an excimer discharge, which device is equipped with an at least partly UV-transparent discharge vessel whose discharge space is filled with a gas filling, with means for triggering and maintaining an excimer discharge in the discharge space, and with a coating that contains a phosphor comprising a host lattice and neodymium(III) as an activator. The invention also relates to the use of the device for photolytic processes.

Description

DEVICE FOR GENERATING UV RADIATION
The invention relates to a device for generating electromagnetic radiation, which device is equipped with an at least partly transparent discharge vessel whose discharge space is filled with a gas filling, with means for triggering and maintaining an excimer discharge in the discharge space, and with a coating that contains a phosphor. Radiation sources of this kind are suitable, depending on the spectrum of the radiation emitted, for general and auxiliary lighting, e.g. domestic and office lighting, for the back-lighting of displays, e.g. liquid crystal displays, for traffic lights and signal lighting, and for photochemical processes, e.g. sterilization and photolysis.
The devices concerned are in particular ones of the kind known from EP 1048 620 for the disinfection of water.
A disadvantage of the devices described in EP 1048 620 is that the optical efficiency achieved is low for photolytic applications. In photolytic processes, radiation having a very high photon energy is absorbed by certain organic molecules, and the chemical C-C and C-O bonds, for example, in the molecules are severed. Photolytic processes are used for example to produce very pure water, for the dry cleaning of surfaces, for the curing of polymers, and similar applications.
It is an object of the present invention to provide a device for generating ultraviolet radiation that is ideally suited to photolytic processes.
In accordance with the invention, this object is achieved by a device for generating ultraviolet radiation by means of an excimer discharge, which device is equipped with an at least partly UN-transparent discharge vessel whose discharge space is filled with a gas filling, with means for triggering and maintaining an excimer discharge in the discharge space, and with a coating that contains a phosphor comprising a host lattice and neodymium(III) as an activator. A device of this kind converts the primary radiation generated by the excimer discharge into radiation having a maximum emission at a wavelength of between 180 and 250 nm. Radiation in this wavelength range has a high photon energy and breaks even strong chemical bonds such as single C-C or C-O bonds. It is, therefore, suitable for use in photolytic processes such as are used for producing very pure water, in the dry cleaning of surfaces, the curing of polymers and similar applications.
Hence, the maximum emission lies in the range between 180 and 250 nm that encourages photolytic reactions, and has a high depth of penetration into water and other solvents. In one embodiment of the invention, the phosphor contains praseodymium(III) as a co-activator.
It is preferred for the phosphor to be selected from the group (Laι-xYx)PO :Nd where 0 < x < 1, (La,-xYx)PO4:Nd,Pr where 0 < x < 1, SrAl,2Oι9:Nd, LaBO3O6:Nd, LaMgB5Oιo:Nd, SrAl,2OI9:Nd,Pr, LaBO3O6:Nd,Pr, LaMgB5Oι0:Nd,Pr and GdPO4:Nd. It may also be preferred for the phosphor to comprise a coating that contains an oxide selected from the group MgO, SiO2 and Al2O3.
In one embodiment of the invention, the gas filling contains a gas selected from the group xenon, krypton, argon, neon and helium.
It is particularly preferred for the gas filling to contain xenon. A xenon- excimer discharge shows particularly efficient NUN generation with a maximum at 172 ± 3.5 nm, more than 80% of which is converted by the Νd(III)-activated phosphors.
The electrodes may be composed of a metal or alloy that reflects UV-C light. Part of the discharge vessel may be provided with a coating that acts as a reflector of NUN and UN-C light. The invention also relates to the use of the device for photolytic processes.
These and other aspects of the invention are apparent from and will be elucidated with reference to the embodiments described hereinafter.
In the drawings:
Fig. 1 shows a first design of device for generating ultraviolet radiation, having a concentric electrode.
Fig. 2 shows a first design of device for generating ultraviolet radiation, having a concentric electrode, in cross-section. Fig. 3 shows a second design of device for generating ultraviolet radiation, of the co-axial type.
Fig. 4 shows a second design of device for generating ultraviolet radiation, of the co-axial type, in cross-section. Fig. 5 shows a third design of device for generating ultraviolet radiation, of the tubular type.
Fig. 6 shows a third design of device for generating ultraviolet radiation, of the tubular type, in cross-section.
Fig. 7 shows a fourth design of device for generating ultraviolet radiation, having buried electrodes.
Fig. 8 shows a fourth design of device for generating ultraviolet radiation, having buried electrodes, in cross-section.
Fig. 9 shows a fifth design of device for generating ultraviolet radiation, having UN reflectors. Fig. 10 shows a fifth design of device for generating ultraviolet radiation, having UN reflectors, in cross-section.
Fig. 11 shows a sixth design of device for generating ultraviolet radiation, employing corona discharge, in cross-section.
Fig. 12 shows a sixth design of device for generating ultraviolet radiation, employing corona discharge, in plan.
Fig. 13 shows a seventh design of device for generating ultraviolet radiation, in the form of a flat lamp.
Fig. 14 shows a seventh design of device for generating ultraviolet radiation, in the form of a flat lamp, in cross-section. Fig. 15 is a chart showing an illustrative calculation of the efficiency with which UN fluorescent radiation of around 200 nm is generated from the primary radiation from an Xe-excimer discharge.
The device according to the invention for generating ultraviolet radiation by means of an excimer discharge is equipped with an at least partly UN-transparent discharge vessel whose discharge space is filled with a gas filling, and with a coating that comprises a phosphor that contains a host lattice and neodymium(III) as an activator. The device is also equipped with means for triggering and maintaining the excimer discharge. There are a wide variety of possible designs for the discharge vessel such as plates, single tubes, co-axial tubes, and discharge tubes that are straight, U-shaped, curved or coiled in a circle, cylindrical or of other shapes. A typical design for a device for photolytic reactions is that shown in Figs. 1 and 2. As means for triggering and maintaining the excimer discharge, this design comprises amongst other things electrodes of first and second types. A coiled wire is inserted in the gas-discharge vessel 100 concentrically thereto. This wire forms the first, inner electrode 301 of the device. The outside of the glass is covered with a small- mesh wire mesh that forms the second, outer electrode 302. The discharge vessel is sealed with a gas-tight seal. The space within it is filled with xenon or a gas containing xenon. The two electrodes are connected to the two poles of an a.c. power source. The electrode geometry, together with the pressure in the discharge vessel and the composition of the gas, is matched to the characteristics of the a.c. power source.
Another typical design for photolytic reactions is the co-axial design through which water or a flow of air flows centrally, which is shown in Figs. 3 and 4. The discharge vessel 100 comprises two co-axial bodies made of glass that are connected together in a gas- tight manner to form a hollow sleeve. The annular gap between the two co-axial bodies of glass forms the discharge space 200 and is filled with xenon or a gas containing xenon. The fluid medium to be treated may flow through the inner tube, to the inner wall of which a transparent electrode 301 of the first kind is applied. The medium to be treated may also be situated outside the outer tube. The outside of the glass is covered with a small-mesh wire mesh that forms the second, outer electrode 302. The power supply is provided by an a.c. power source connected to these two electrodes.
Another typical and easily produced design is shown in Figs. 5 and 6.
The flat design shown in Figs. 13 and 14 (a "flat lamp") is particularly suitable for the dry cleaning of surfaces and for curing paint finishes.
In the design shown in Figs. 7 and 8 the electrodes are mounted on the inside of the wall of the gas-discharge vessel and are separated from the gas discharge space 200 by a covering layer 102 of a dielectric material. This dielectric covering layer 102 preferably comprises glass solder. The material used for the discharge vessel is preferably quartz or types of glass that are permeable to UN-C and VUN radiation.
The means of triggering and maintaining an excimer discharge comprise electrodes of first and second kinds. In a preferred design, electrodes of the first and second kinds are arranged on the wall of the discharge vessel to generate a dielectrically inhibited discharge, with at least one electrode being separated from the discharge space by a dielectric material. In designs in which at least one electrode is separated from the discharge space by a dielectric barrier, a silent electric discharge is triggered in the filling gas when a suitable a.c. voltage is applied. In the designs shown in Figs. 11 and 12, a discharge of the corona type is triggered in the filling gas when a suitable d.c. or a.c. voltage is applied to the electrodes. In designs that are suitable for a discharge of the corona type, it is not necessary for the electrodes of the first and second types to be separated from the filling gas by a layer of a dielectric material. In the case of both the silent electrical discharge and the corona discharge, a plasma that contains excimers, i.e. molecules that are only stable in the excited state, forms if there is a suitable gas filling and irrespective of the gas pressure and the electrode geometry.
The electrodes are composed of a metal, e.g. aluminum or silver, a metal alloy, or a transparent conductive inorganic compound, e.g. ITO. They may take the form of a coating, a bonded-on foil, strips of bonded-on foil, a wire or a wire mesh.
It is also possible for a transparent electrolyte, e.g. water, to be used as one of the electrodes. This is particularly advantageous for photolytic processes in water because the radiation is generated in this way in the immediate vicinity of the medium to be irradiated.
In another preferred embodiment, electrodes of first and second kinds are arranged on the wall of the discharge vessel to generate a corona discharge.
To focus the light intensity in a given direction, part of the discharge vessel may be provided with a coating that acts as a reflector 400 of NUN and UN-C light. UN reflectors are preferably used for designs as shown in Figs.9 or 10 in order to increase the inward or outward radiation by means of a surface. Metal surfaces, which are provided with a protective layer transparent to UN where required, are suitable for use as reflectors of radiation in the UN-C or NUN range. An aluminum foil coated with magnesium fluoride is suitable, for example.
Another suitable form of coating that acts as a reflector is a coating that contains particles of a material selected from the group MgO, SiO2, AI2O3, (Laι-xYx)PO where 0 < x < 1, (Laι-xYx)PO4 where 0 < x < 1, SrAlι2O|9, LaB3O6, LaMgB5Oι0, SrAl12Oι9, LaBO3O6, LaMgBsOio and GdPO .
There are also certain designs for the electrodes of the first and second types that are of large area and are composed of a metallic material and that act as reflectors of UV- C and NUN radiation. A design of this kind is shown by way of example in Fig.l 1. The discharge vessel is preferably filled with oxygen-free xenon or a mixture of gases that contains xenon, because there is a substantial concentration of the electron energy distribution of an excimer discharge in a xenon-containing atmosphere in the region of the first Xe excitation energy at 8.4 eN and this distribution is thus ideally matched to the formation of Xe2 excimers and, as a result of the emission of the latter in the wavelength range between 160 and 190 nm, to the excitation of neodymium-containing phosphors. The inner wall of the discharge vessel is wholly or partly covered with a coating 101 that contains the phosphor. The coating may also contain an organic or inorganic binder or binder composition. Furthermore, the phosphor layer may be protected against attack by the discharge by means of a protective layer.
The phosphor comprises a host lattice that is doped with a few percent of an activator. The Νd3+-activated phosphors that are used in accordance with the invention are principally phosphors having a host lattice that exerts a weak ligand field. What are particularly suitable are inorganic, oxygen-containing host lattices composed of oxides, aluminates, gallates, phosphates, borates or silicates. A high co-ordination number in these host lattices also reduces the crystal-field splitting of the neodymium d-orbitals that play a part in the optical transitions. Hence, at 43000 cm"1, the 4f5d level of neodymium that emits NUN and UN-C radiation is so far above the ground state that non-radiating relaxation is avoided by means of excited 4f4f states. Hence, these Νd3+-activated phosphors, and particularly the phosphors that are selected from the group (Laι-xYx)PO4:Nd where 0 < x < 1 , (La,.xYx)PO4:Nd,Pr where 0 < x < 1, SrAlι2O19:Nd, LaBO3O6:Nd, LaMgB5Oι0:Nd, SrAli2O,9:Nd,Pr, LaB3O6:Nd,Pr, LaMgB5O,0:Nd,Pr and GdPO4:Nd, are particularly efficient phosphors under vacuum UN excitation.
As an activator, the Νd3+ ion generally shows wide absorption bands in the ultraviolet, sometimes extending into the blue, in the various host lattices. The emission bands of the phosphors according to the invention are situated in the range from the deep ultraviolet to the yellow-orange, with an emission maximum at a wavelength between 180 and 250 nm, i.e. in the UC-C and NUN range. The extinction temperature of these phosphors is above 100°C. What may also be particularly preferred are phosphors that contain praseodymium, such as (Laι.xYx)PO4:Νd,Pr where 0 < x < 1, SrAlι2Oι9:Nd,Pr, LaB3O6:Nd,Pr and LaMgB5Oιo:Nd,Pr, for example.
If an a.c. voltage is applied to the electrodes, a silent electrical discharge is triggered in the filling gas, which is preferably xenon-containing. As a result, xenon excimers, i.e. molecules that are only stable in the excited state, form in the plasma. Xe + Xe* = We2*.
The excitation energy is emitted again as UN radiation at a wavelength of λ = 140 to 190 nm. This conversion of electron energy into UN radiation is performed with great efficiency. The UN photons generated are absorbed by the phosphors and the excitation energy is emitted again partly in the longer wavelength range of the spectrum. The absorption co-efficient of the phosphors activated with Νd or with Νd and Pr is particularly high for wavelengths in the xenon-radiation range and the quantum yield is high. The host lattice affects the exact position of the energy level of the activator ion and hence the emission spectrum.
The phosphors are produced by a solid-state reaction from the starting compounds, in the form of fine-grained powders having a grain-size distribution of between 1 and 10 μm. They are applied to the walls of the discharge vessel by a flow coating process. The coating suspensions for the flow coating process contain water or an organic compound such as butyl acetate as a solvent. The suspension is stabilized, and its rheological properties acted on, by adding aids such as stabilizers, liquefiers and cellulose derivatives. The phosphor suspension is applied to the walls of the vessel as a thin film, dried and fired on at 600°C. The vessel is then evacuated to remove all gaseous contaminants and particularly oxygen. The vessel is then filled with xenon at a pressure of approximately 200 to 300 mbar and sealed.
The devices described are highly suitable for high-yield photolytic reactors. Because the spectrum of the radiation emitted is confined to a narrow band, the device according to the invention may advantageously be employed to carry out wavelength- selective photoreactions. Table 1 shows the absorption edges of certain widely used solvents
Table 1
Figure imgf000009_0001
Industrial photochemical processes (e.g. photo-chlorination, photo- bromination, photo-sulfochlorination) can also be carried out more efficiently with the device according to the invention.
Further uses for the device according to the invention have to do with water and waste water technology where polluted water is the fluid to be treated. Examples of treatment of this kind that may be mentioned are a) disinfection b) breakdown of pollutants and dyes and removal of odor.
The device according to the invention may also be used for sterilizing other liquids and solvents.
In the case of the design shown in Figs. 1 and 2, the medium to be treated may be conducted past the outside face of the radiant source. In a further application, this design may, for example, be used for the cleaning of surfaces in the dry state.
In the case of the design shown in Figs. 3 and 4, the reacting medium may be conducted past the inner and/or outer face of the radiant source. To make it possible for irradiation to take place at the inner face, the electrode adjacent the axis of the lamp must be transparent or perforated. This design can be used to destroy solvent residues in water or air or other gases.
As shown in Fig. 15, an overall efficiency of 26.6%> can be achieved for a driver efficiency of 65% a plasma efficiency for the xenon excimer discharge of 60%>, a quantum conversion efficiency on the part of the phosphor of 90%>, a Stokes shift of 85%> and a transmission by the material of the gas discharge vessel of 89%. This is more than three times the efficiency of a mercury NUN lamp. EMBODIMENT 1
A suspension of LaPO4:Nd in butyl acetate with nitrocellulose as a binder is produced. The phosphor suspension is applied to the inner wall of a tube of synthetic quartz (Suprasil™) with an inside diameter of 5 mm by a flow coating process. The thickness of the phosphor layer corresponds to a weight per unit area for the phosphor of 3 mg/cm . The binder is burnt off at a temperature below 580°C. The device is filled with xenon at a pressure of 200 to 300 mbar and then sealed. Any contamination by oxygen must be carefully avoided. Two electrodes of aluminum foil are bonded diagonally to the outer wall of the device.
The device is operated by a.c. current having a square-wave characteristic, an amplitude of 6 kV and a frequency of 25 kHz. EMBODIMENT 2 The discharge vessel of the device in example of implementation 2 comprises a cylindrical tube of synthetic quartz (Suprasil™) measuring 0.7 mm in thickness and 50 mm in diameter. It is filled with xenon at a pressure of 200 mbar. An inner electrode of metal wire coiled in a spiral is arranged on the axis of the tube. Six strips of silver foil are bonded to the outer wall of the discharge vessel parallel to the inner electrode to form the outer electrode. The inner surface of the outer wall is coated with a layer of phosphor that contains YPO4:Nd as a phosphor.
The device is operated by a.c. current having a square-wave characteristic, an amplitude of 6 kV and a frequency of 25 kHz. EMBODIMENT 3 The discharge vessel of the device in example 3 comprises two co-axial tubes of synthetic quartz (Suprasil™) measuring 0.7 mm in thickness, and 50 mm in inside diameter and 40 mm in outside diameter respectively. The two tubes are so connected together at both ends as to form a gas-tight hollow sleeve. This is filled with xenon at a pressure of 200 mbar. The wall of the hollow sleeve adjacent the axis of the tubes is coated with a layer of aluminum that forms the first electrode and on the side remote from the axis of the tubes six strips of silver foil are bonded to the wall of the hollow sleeve remote from the axis of the tubes, parallel to the axis of the tubes, these strips forming the second electrode. The inner surfaces of the hollow sleeve are coated with a layer of phosphor that contains LaPO4:Nd as a phosphor.
The device is operated by a.c. current having a square-wave characteristic, an amplitude of 6 kV and a frequency of 25 kHz.

Claims

CLAIMS:
1. A device for generating ultraviolet radiation by means of an excimer discharge, which device is equipped with an at least partly UN-transparent discharge vessel whose discharge space is filled with a gas filling, with means for triggering and maintaining an excimer discharge in the discharge space, and with a coating that contains a phosphor comprising a host lattice and neodymium(III) as an activator.
2. A device for generating ultraviolet radiation as claimed in claim 1, characterized in that the phosphor contains praseodymium(III) as a co-activator.
3. A device for generating ultraviolet radiation as claimed in claim 1, characterized in that the phosphor is selected from the group (Laι-xYx)PO :Νd where 0 < x < 1, (Laι.xYx)PO4:Nd,Pr where 0 < x < 1, SrAl12O,9:Nd, LaB3O6:Nd, LaMgB5Oι0:Nd, SrAl,2O19:Nd,Pr, LaBO3O6:Nd,Pr, LaMgB5O,0:Nd,Pr and GdPO4:Nd,
4. A device for generating ultraviolet radiation as claimed in claim 1 , characterized in that the phosphor comprises a coating that contains an oxide selected from the group MgO, SiO2 and AI2O3.
5. A device for generating ultraviolet radiation as claimed in claim 1, characterized in that the gas filling contains a gas selected from the group xenon, krypton, argon, neon and helium.
6. A device for generating ultraviolet radiation as claimed in claim 1 , characterized in that the gas filling contains xenon.
7. A device for generating ultraviolet radiation as claimed in claim 1, characterized in that the electrodes are composed of a metal or alloy that reflects UN-C light.
8. A device for generating ultraviolet radiation as claimed in claim 1 , characterized in that part of the discharge vessel is provided with a coating that acts as a reflector of NUN and/or UN-C light.
9. Use of the device claimed in claim 1 for photolytic processes.
PCT/IB2003/000711 2002-03-04 2003-02-26 Device for generating uv radiation WO2003075314A1 (en)

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DE60326940T DE60326940D1 (en) 2002-03-04 2003-02-26 DEVICE FOR PRODUCING ULTRAVIOLETTER RADIATION
JP2003573674A JP2005519438A (en) 2002-03-04 2003-02-26 Ultraviolet radiation generator
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