Classifications

• • 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
  • C09K11/0883—Arsenides; Nitrides; Phosphides
• • 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
  • C09K11/02—Use of particular materials as binders, particle coatings or suspension media therefor
  • C09K11/025—Use of particular materials as binders, particle coatings or suspension media therefor non-luminescent particle coatings or suspension media
• • 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
  • C09K11/7728—Luminescent materials, e.g. electroluminescent or chemiluminescent containing inorganic luminescent materials containing rare earth metals containing europium
  • C09K11/77342—Silicates
• • 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
  • C09K11/7728—Luminescent materials, e.g. electroluminescent or chemiluminescent containing inorganic luminescent materials containing rare earth metals containing europium
  • C09K11/77347—Silicon Nitrides or Silicon Oxynitrides
• • 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 phosphor compound for a discharge lamp and to a discharge lamp, in particular a Hg low-pressure discharge lamp.
• foils are applied as color filters to increase the color saturation on the outside of the discharge vessel of the discharge lamp.
• a green foil is attached.
• pigmented films or films provided with a dye for example of PET, PC or VPA.
• a phosphor compound according to the invention for a discharge lamp has an emission spectrum in the green spectral range and is designed to absorb a radiation emitted by a Hg (mercury) source in the visible spectral range and to convert this visible radiation of the Hg source into the emission spectrum of the phosphor compound.
• a substantially higher color saturation of a green light-generating discharge lamp can be achieved.
• the production of more compact types of lamps with the same emission compared to discharge lamps of the prior art can be achieved.
• compact fluorescent lamps without an enveloping bulb can be improved and manufactured.
• the phosphor compound is preferably Tb (terbium) -free and Mn (manganese) -free. This can also be done a reduced cost luminescent compound is produced, which contributes to the better efficiency of the discharge lamp.
• the phosphor compound according to the invention thus has an emission behavior in which a suitable spectrum with the appropriate color locus can be emitted, and moreover not only absorbs the visible Hg-Vis radiation of an Hg source, but is convertible into the emission spectrum of the phosphor compound.
• absorption and conversion of this visible Hg radiation is compared to the known from the prior art solutions with absorbing color filters higher color saturation at the same time higher efficiency of the discharge lamp he ⁇ reaches. The need for a color filter is then eliminated.
• the phosphor compound is so registeredbil ⁇ det that it has a very strong absorption for radiation having a wavelength of about ⁇ wa 254 nm. Radiation having such a wavelength is radiated as the main intensity in the low-pressure mercury discharge in a Hg low-pressure discharge lamp.
• a very strong absorption is characterized in that the reflection of a pressed powder tablet in 45 ° / 0 "geometry ge ⁇ measure wears relative to a standard of less than 40% A12O3-loading.
• the fluorescent compound is preferably further formed so that it has a strong absorption for radiation having a wave length of less than 440 nm ⁇ . Since ⁇ at a strong absorption means that the reflection of a pressed powder tablet in 45 ° / 0 "geometry overall measure less than 60% relative to an A12O3 standard.
• the phosphor compound is so registered trademark of International Organization for Microwave Tube (ICR) ⁇ det that it has a weak absorption for radiation having a wavelength greater than 530 nm.
• Weak absorption means that the reflection of a pressed powder tablet in 45 ° / 0 "geometry measured relative to an A12O3 standard is more than 90%.
• the emission spectrum of the phosphor compound has a dominant wavelength between 500 nm and 565 nm.
• the phosphor compound has a dominant wavelength in the region of 555 nm.
• Characterized emit green light may in particular ⁇ de discharge lamps having a dominant Emissionswel- len couple are provided which can be det alreadybil ⁇ with a color saturation greater than 80% in the range of 555 nm. This is a significant increase in color saturation, since lamps known from the prior art with an emission spectrum in the wavelength range mentioned reach only a maximum color saturation of 60%. In addition, in a lamp with such a phosphor compound, a higher light output can be made possible.
• the half-width of the emission band of the phosphor compound according to the invention is preferably less than 100 nm.
• the fluorescent compound as an ingredient ⁇ in part to a orthosilicate.
• the orthosilicate is preferably formed from the formula (Ba, Sr, Ca) 2SiO4.
• the phosphor compound contains as component a phosphor of the class of the nitrides or oxynitrides, in particular (Sri - x - y Ba x Ca y ) Si 2 O 2 N 2 : Eu, which will be referred to below as SrSiON be - is characterized has. Can be achieved at a higher light output straight through these two material compound before ⁇ geous various components of the lighting device to increase the color saturation of a green discharge lamp respectively.
• the fluorescent compound in particular the components of the fluorescent compound with Eu (Euro ⁇ Pium) is doped.
• the weight fraction of the doping with Eu is preferably between 0.1% and 15%, in particular between 0.2% and 2%.
• the weight fraction of the doping with Eu is between 1% and 2%. This specific weight fraction is particularly preferred for a phosphor compound which comprises SrSiONiEu.
• the phosphor compound thus comprises no Tb-containing constituent, such as LAP, CAT or CBT, as is the case in the prior art, but in particular SrSiON or an orthosilicate.
• This inventory ⁇ parts of the green-emitting phosphor compound according to the invention also be used instead of known from the prior art the Mn-containing compounds such as ZnSiMn or BAMiEU, Mn.
• the phosphor compound according to the invention and / or at least one of the advantageous embodiments consists exclusively of the respectively named compositions and thus no further includes more chemical ingredients.
• this is not an exhaustive Kom ⁇ ponentenangabe, but that the fluorescent compound of the invention and / or an advantageous execution tion which in addition also may share inventory ⁇ , in particular further phosphors include chemical.
• CAT denotes (Ce, Tb) MgA111019
• LAP denotes (La, Ce, Tb) PO4
• BAM denotes (Ba, Eu) MgA110O17
• BAMMn denotes (Ba, Eu) (Mg, Mn) A110O17
• CBT denotes (Gd, Ce, Tb) (Mg, Zn, Mn) B5O10
• SCAP denotes (Sr, Ba, Ca, Mg, Eu) 5 (PO4) 3 (F, Cl)
• SCAPMn denotes (Sr, Ba, Ca, Mg, Eu, Mn) 5 (PO4) 3 (F, Cl)
• Zinc silicate (Zn, Mg, Mn) denotes 2SiO4
• YOE refers to Y2O3: Eu.
• the invention relates to a discharge lamp with a discharge vessel, on the inside of which a phosphor layer is formed.
• the phosphor Layer has a phosphor compound according to the invention or an advantageous embodiment thereof.
• the phosphor layer is formed directly on the inside of the discharge vessel.
• the phosphor compounds of the luminescent ⁇ material layer are surrounded by a protective layer, so that the phosphor grains or phosphor compounds are embedded in the protective layer.
• the material components of the protective layer to those of the phosphor ⁇ compound are different.
• the said protective layer which comprises the phosphor compound. fertilize the phosphor layer surrounded, be met.
• a possible dich ⁇ th and thin protective layer is formed around the individual phosphor ⁇ grains.
• This protective layer differs in its composition from the composition in the interior of the phosphor grain or of the average composition.
• the composition of the surface can be determined, for example, with surface-sensitive methods such as XPS or SNMS, which determine the average composition of the phosphor with volume-sensitive methods such as EDX, RFA or chemical analysis.
• the protective layer comprises a Me ⁇ talloxid.
• the protective layer may be provided as metal oxide A12O3, Y2O3 or SiO2.
• the protective layer borates or phospha te ⁇ has. It may also include fluorides.
• the protective layer ternary material ⁇ lien such as aluminum or aluminum borates includes phosphates.
• metal oxides or a material with positive surface charge in water are to be provided since they tend to reduce the absorption of Hg. Therefore, A12O3 and Y2O3 are particularly suitable.
• protective layers and SiO2 can often be particularly dense, thin and inexpensive to manufacture and result in an improvement of the radiation stability and the water stability so that they apply despite lower top ⁇ surface charge and tend to be higher absorption of Hg.
• such coated and thus surrounded with egg ⁇ ner protective layer phosphor compounds of the phosphor layer are used in the discharge lamp.
• the discharge lamp is designed in particular as Hg low-pressure discharge lamp.
• discharge lamps are possible for example in light-emitting and in traffic components used to generate traffic signals. Furthermore, such discharge lamps can be used for the display of emergency exits. Even with camping lights or effect lighting a corresponding use can be provided.
• the fluorescent compound of the invention and / or at least one of the advantageous embodiments exclusively from the respective said compositions is and thus includes no white ⁇ direct chemical constituents.
• this is not an exhaustive Kom ⁇ ponentenangabe, but that the fluorescent compound of the invention and / or an advantageous execution tion which in addition also may share inventory ⁇ , in particular further phosphors include chemical.
• FIG. 1 shows a schematic sectional view of a discharge lamp according to the invention
• FIG. 2 shows a diagram in which an emission spectrum of a phosphor known from the prior art and an embodiment of a phosphor compound according to the invention are shown;
• FIG. 3 shows a table in which photometric properties of a phosphor from the prior art and properties of embodiments of a phosphor compound according to the invention are indicated.
• a discharge lamp 1 is shown in a schematic sectional view, which is designed as Hg- low-pressure discharge lamp.
• the Entla ⁇ tion lamp 1 is rod-shaped and comprises a tubular discharge vessel 2, which is a glass bulb.
• a base 3 is attached, which has outwardly extending elekt ⁇ cal contacts 4 and 5.
• a base is also located 6 to which réellere ⁇ ADORABLE electrical contacts are attached to 7 and 8 to the outside at the gegenü ⁇ bercharacter of the discharge vessel. 2
• These electrical contacts 7 and 8 are ü- power leads with an electrode 10, which is extends into the discharge space 13 of the discharge vessel 2, electrically connected.
• the electrical contacts 4 and 5 are connected to power supply lines which are connected to a further electrode 9, whereby this electrode 9 also extends in the discharge space 13 of the discharge vessel 2.
• a phosphor layer 12 is formed, which extends approximately exporting ⁇ for example over the entire length of the discharge vessel. 2
• the phosphor layer 12 is directly on the inner side 11adedbil ⁇ det in exporting ⁇ approximately example.
• the phosphor layer is shown only 12, it can be provided, upper side 14 that also of the discharge space 13 facing the top 14 and thus the inside 11 of the Entla ⁇ -making vessel 2 facing away from another layer is formed.
• This may for example be a protective layer for the phosphor compounds of the phosphor layer 12.
• a further phosphor layer can be formed directly or indirectly.
• the phosphor layer 12 comprises a multiplicity of phosphor grains or phosphor compounds, wherein a phosphor compound has an emission spectrum in the green spectral range and for absorption of a radiation emitted by a Hg source in the visible spectral range and for conversion of this visible radiation of the Hg source into the emission spectrum of the phosphor ⁇ connection is formed.
• An Hg source is understood as meaning a mercury atom or a mercury ion which, during the low-pressure discharge in the discharge space 13, is excited by the electrons emitted by an electrode 9 or 10 and emits the radiation mentioned.
• the phosphor compounds in the phosphor layer 12 emit a suitable spectrum with the appropriate color locus.
• a phosphor compound is formed so that it absorbs very strongly at a wavelength of 254 nm, in which the main intensity of the Hg low-pressure discharge is radiated, strongly absorbed at wavelengths less than 440 nm and weakly absorbed in Wellenhavenbe ⁇ range greater than 530 nm ,
• the phosphor compound is formed to give a green emission having a dominant wavelength between 500 nm and 565 nm.
• the discharge lamp 1 with the phosphor layer 12 designed with the phosphor compounds is designed such that a dominant wavelength in the region of 555 nm occurs.
• a phosphor compound of the phosphor layer 12 is doped with europium.
• the phosphor compound is SrSiONiEu
• doping with europium is between 1% and 2%.
• the phosphor compound is a europium-doped orthosilicate, wherein the orthosilicate is formed from the general formula (Ba, Sr, Ca) 2SiO4.
• the phosphor compounds are preferably surrounded by a protective layer of metal oxides, a borate, a phosphate or a ternary material.
• the phosphor compound emits light having the light color 66.
• FIG. 2 a diagram is shown, wherein the TERMS ⁇ onsspektrum one known from the prior art phosphor (light color 66) according to the dashed Li ⁇ never and a comprehensive the component SrSiON inventory ⁇ part of a phosphor according to the invention or a fluorescent compound of the invention shown.
• the difference ⁇ friendliness between the spectra can be seen, so it can be seen, the improved properties of a fluorescent compound of the invention.
• FIG. 3 shows a table in which in the first two lines exemplary embodiments of phosphor compounds according to the invention are indicated with their chromaticities or standard chromaticity coordinates x and y. In addition, the dominant wavelength lam_dom and the color saturation in percent are also given. In the last line compared to the specification of the ent ⁇ speaking values and parameters for the known from the prior art fluorescent LAP is shown. It is know ⁇ to it that at substantially the same Normfarbwertan- share a much higher color saturation with the execution ments of the phosphor compound according to the invention over the phosphor known from the prior art can be achieved.

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

Priority Applications (4)

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Publications (1)

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Citations (3)

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• 2007
  • 2007-07-16 DE DE102007033028A patent/DE102007033028A1/de not_active Withdrawn
• 2008
  • 2008-07-09 KR KR1020107003409A patent/KR20100061791A/ko not_active Withdrawn
  • 2008-07-09 CN CN200880024611.2A patent/CN101743613B/zh not_active Expired - Fee Related
  • 2008-07-09 US US12/452,129 patent/US8450919B2/en not_active Expired - Fee Related
  • 2008-07-09 JP JP2010516462A patent/JP2010533942A/ja active Pending
  • 2008-07-09 WO PCT/EP2008/058894 patent/WO2009010430A1/de not_active Ceased
  • 2008-07-09 EP EP08786001A patent/EP2165352B1/de not_active Not-in-force

Patent Citations (3)

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