Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
  • H01J61/00—Gas-discharge or vapour-discharge lamps
  • H01J61/02—Details
  • H01J61/38—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
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
  • A61N5/00—Radiation therapy
  • A61N5/06—Radiation therapy using light
  • A61N5/0613—Apparatus adapted for a specific treatment
  • A61N5/0614—Tanning
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
  • A61N5/00—Radiation therapy
  • A61N5/06—Radiation therapy using light
  • A61N5/0613—Apparatus adapted for a specific treatment
  • A61N5/0616—Skin treatment other than tanning
• • 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 materials, e.g. electroluminescent or chemiluminescent
  • C09K11/08—Luminescent materials, e.g. electroluminescent or chemiluminescent containing inorganic luminescent materials
  • C09K11/77—Luminescent materials, e.g. electroluminescent or chemiluminescent containing inorganic luminescent materials containing rare earth metals
  • C09K11/7766—Luminescent materials, e.g. electroluminescent or chemiluminescent containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals
  • C09K11/7774—Aluminates
• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
  • H05B33/00—Electroluminescent light sources
  • H05B33/12—Light sources with substantially two-dimensional [2D] radiating surfaces
  • H05B33/14—Light sources with substantially two-dimensional [2D] radiating surfaces characterised by the chemical or physical composition or the arrangement of the electroluminescent material, or by the simultaneous addition of the electroluminescent material in or onto the light source

Definitions

• UV-A or UV-B-emitting discharge lamp UV-A or UV-B-emitting discharge lamp
• the present invention is directed to novel materials for light emitting devices, especially to the field of novel materials for discharge lamps emitting UV radiation.
• Fluorescent lamps which comprise an UV emitting phosphor are widely applied for cosmetic and medical purposes. These lamps usually generate UV light by e.g. utilizing an Hg low-pressure discharge and a luminescent screen comprising UV-B or UV-A phosphors or a blend of several UV-A/B phosphors.
• the most commonly applied phosphors are LaP0 4 :Ce, SrAli 2 0i 9 :Ce,Na, or LaB 3 0 6 :Bi,Gd as UV-B emitter and (Y,Gd)P0 4 :Ce, BaSi 2 0 5 :Pb, or SrB 4 0 7 :Eu as UV-A emitter.
• Hg discharge lamps for disinfection or purification purposes do not use a luminescent screen, since the spectral power distribution of the emission spectrum of a low-or medium-pressure Hg discharge nicely coincides with the GAC and with the absorption edge of molecular Oxygen and water.
• the main drawback of the presently applied low- and medium-pressure Hg discharge lamps is their strong dependence on the radiation output from the (water, air) temperature. This is caused by the vapor pressure of liquid Hg, which is a sensitive function of temperature.
• a discharge lamp preferably a low-pressure gas discharge lamp
• said discharge lamp is provided with a discharge vessel comprising a gas filling with a discharge-maintaining composition, wherein at least a part of a wall of the discharge vessel is provided with a luminescent material comprising Lui_ x _ y _ a _ b Y x Gd y ) 3 Al 5 _ z Ga z Oi2:REl a :RE2b, with RE1 being selected out of the group comprising Pr 3+ , Tm 3+ or mixtures thereof, RE2 being selected out of the group comprising Nd 3+ , Sm 3+ , Eu 3+ , Tb 3+ , Dy 3+ , Ho 3+ , Er 3+ or mixtures thereof and a is >0 and ⁇ 0.1, b is >0 and ⁇ 0.1, x is >0 and ⁇ 1, y
• such a discharge lamp has at least one of the following advantages:
• the discharge lamp is a Xe, Ne, or Xe/Ne excimer discharge lamp.
• the luminescent material comprises
• z is >1 and ⁇ 3.
• the basic metal oxide is preferably provided as a nanoscale particle material with an average particle size of >10 nm and ⁇ 1 ⁇ , preferably >100 nm and ⁇ 500nm.
• the luminescent material e.g. a layer is formed comprising both materials
• the luminescent material e.g. a layer is formed comprising both materials
• At least a part of a wall of the discharge vessel is provided with a further luminescent material selected out of the group comprising (Yi_ x _ a Lu x )B0 3 :Pr a , (Y ⁇ Lu ⁇ PO ⁇ Pr,, (Y 1 _ x _ a Lu x )P0 4 :Bi a , L ai _ a P0 4 :Pr a , (Y !
• the present invention furthermore relates to the use of (Lui_ x _ y _ a _ b Y x Gd y ) 3 Al 5 _ z Ga z Oi 2 :REl a :RE2b, with RE1 being selected out of the group comprising Pr 3+ , Tm 3+ or mixtures thereof, RE2 being selected out of the group comprising Nd , Sm , Eu , Tb , Dy 3+ , Ho 3+ , Er 3+ or mixtures thereof and a is >0 and ⁇ 0.1, b is >0 and ⁇ 0.1, x is >0 and ⁇ 1, y is >0 and ⁇ 1 (with the proviso that a+b+x+y are ⁇ 1) and z is >0 and ⁇ 5 as an activator in UV- A and/or UV-B emitting illumination systems.
• a system comprising a discharge lamp as described herein or making use of the phosphor material as described above may be used in one or more of the following applications:
• Equipment for medical therapy e.g. Treatment of skin diseases such as asthma
• Equipment for cosmetic skin treatment e.g. tanning devices
• Chemical reactors e.g. for the photochemical synthesis of advanced chemical products, e.g. Vitamin D 3
• Fig. 1 shows a very schematic cross-sectional view of a discharge lamp according to a first embodiment of the present invention.
• Fig. 2 shows an emission spectrum of a first luminescent material according to the present invention (Example I).
• Fig. 3 shows the excitation spectrum of the material of Fig. 2.
• Fig. 4 shows an emission spectrum of a second luminescent material according to the present invention (Example II).
• Fig. 5 shows the excitation spectrum of the material of Fig. 4.
• Fig. 6 shows an emission spectrum of a second luminescent material according to the present invention (Example III).
• Fig. 7 shows the excitation spectrum of the material of Fig. 6.
• Fig. 8 shows the emission spectrum of a Xe excimer discharge lamp comprising the materials of Examples I and II.
• Fig. 1 shows a very schematic cross-sectional view of a discharge lamp according to a first embodiment of the present invention.
• the discharge lamp 10 (which is principally prior art) comprises a glass tube 14 in which a phosphor 12 is provided.
• This phosphor comprises the luminescent material of the present invention.
• further phosphors and basic metal oxide nanoparticle may be present in this area.
• two electrodes (e.g. made of Al) 18 are provided.
• Example I refers to LusAlsO ⁇ Tm, which was made in the following way: The starting materials 59.093 g (148.5 mmol) Lu 2 0 3 , 24.471 g (240 mmol) A1 2 0 3 and 1.014 g (3.0 mmol) Tm 2 0 3 are dissolved in cone. HN0 3 . Then the solvent is removed by evaporation and the remaining powder is fired for 2 h at 600 °C to decompose the nitrates.
• the obtained is powderized and 1.680 g (20 mmol) A1F 3 are added as a flux. Afterwards, the powder is annealed for 2 h at 1300 °C in a CO atmosphere, powderized and fired again for 4 h between 1500 and 1700 °C in a CO atmosphere. Finally, the obtained powder cake is crushed and the powder is sieved through a 36 ⁇ sieve.
• Fig. 2 shows the emission spectrum
• Fig. 3 shows the excitation spectrum of the material of Example I. It can clearly be seen that this material is an excellent material for use in discharge lamps for UV-A radiation
• Example II refers to Lu 3 GaAL(Oi 2 :Pr, which was made in the following way:
• the obtained is powderized and 1.680 g (20 mmol) A1F 3 are added as a flux. Afterwards, the powder is annealed for 2 h at 1300 °C in a CO atmosphere, powderized and fired again for 4 h between 1500 and 1700 °C in a CO atmosphere. Finally, the obtained powder cake is crushed and the powder is sieved through a 36 ⁇ sieve.
• Fig. 4 shows the emission spectrum
• Fig. 5 exhibits the excitation spectrum of the material of Example I. It is obvious that this material is an excellent material for use in discharge lamps for UV-B radiation.
• Example III refers to Lu 3 Ga 2 Al 3 0i 2 :Pr, which was made in analogous fashion to the material of Example II.
• Fig. 6 shows the emission spectrum
• Fig. 7 shows the excitation spectrum of the material of Example I. It can clearly be seen that this material is an excellent material for use in discharge lamps for UV-B radiation.
• the invention will furthermore be illustrated by means of an exemplary Xe excimer discharge lamp using the materials of Example I and II. This lamp was made in the following way:
• a suspension of nanoparticles MgO is made on a butylacetate basis with nitrocellulose as a binder.
• the suspension is applied to the inner wall of a standard UV transparent glass tube by using a flow coat related procedure.
• a suspension of a Lu 3 GaAL(Oi2:Pr (Example II) and LusAlsO ⁇ Tm (Example I) is prepared on a butylacetate basis with nitrocellulose as a binder.
• the suspension is applied to the inner wall of the precoated lamp tube with a typical phosphor layer weight in the range of 2 - 6 mg/cm 2 .
• the binder is burned in a standard heating cycle with peak temperatures between 500 and 600 °C.
• the glass tube is filled with Xe using a thorough pumping cycle, so as to strictly exclude Oxygen impurities, and finally sealed.
• Typical gas pressures are 200 - 300 mbar pure Xe.
• Al-electrodes are attached to the outer side of the tube by means of adhesion or painting.
• the lamps are typically operated at 5 kV and 25 kHz, using a pulse driving scheme.
• the emission spectrum is determined using an optical spectrum multianalyser and is shown in Fig. 8.

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• Health & Medical Sciences (AREA)
• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Biomedical Technology (AREA)
• Life Sciences & Earth Sciences (AREA)
• Public Health (AREA)
• Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
• Radiology & Medical Imaging (AREA)
• Animal Behavior & Ethology (AREA)
• General Health & Medical Sciences (AREA)
• Pathology (AREA)
• Veterinary Medicine (AREA)
• Organic Chemistry (AREA)
• Inorganic Chemistry (AREA)
• Materials Engineering (AREA)
• Biophysics (AREA)
• Luminescent Compositions (AREA)
• Non-Portable Lighting Devices Or Systems Thereof (AREA)
• Vessels And Coating Films For Discharge Lamps (AREA)

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• 2011
  • 2011-07-08 WO PCT/IB2011/053045 patent/WO2012007885A1/en not_active Ceased
  • 2011-07-08 EP EP11744082.6A patent/EP2593527B1/en not_active Not-in-force
  • 2011-07-08 US US13/809,521 patent/US20130116756A1/en not_active Abandoned
  • 2011-07-08 CN CN201180034610.8A patent/CN102985512B/zh not_active Expired - Fee Related
  • 2011-07-08 JP JP2013519196A patent/JP5850539B2/ja not_active Expired - Fee Related

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