EP0990691A2 - Composition luminescente and fluorescente pour l'illumination des produits alimentaires - Google Patents

Composition luminescente and fluorescente pour l'illumination des produits alimentaires Download PDF

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Publication number
EP0990691A2
EP0990691A2 EP99119226A EP99119226A EP0990691A2 EP 0990691 A2 EP0990691 A2 EP 0990691A2 EP 99119226 A EP99119226 A EP 99119226A EP 99119226 A EP99119226 A EP 99119226A EP 0990691 A2 EP0990691 A2 EP 0990691A2
Authority
EP
European Patent Office
Prior art keywords
phosphor
mixture
weight
phosphor mixture
halophosphate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP99119226A
Other languages
German (de)
English (en)
Other versions
EP0990691A3 (fr
Inventor
Wolfgang Schneider
Martin Dr. Zachau
Franz Dr. Kummer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ledvance GmbH
Original Assignee
Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
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 Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH filed Critical Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Publication of EP0990691A2 publication Critical patent/EP0990691A2/fr
Publication of EP0990691A3 publication Critical patent/EP0990691A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/38—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 fluorescent mixtures for fluorescent lamps, preferably for lighting meat and sausages serve, but are also suitable for lighting other foods.
  • fluorescent lamps with special color rendering properties are used to illuminate appropriate presentation and sales counters.
  • a commercial example is the fluorescent lamp OSRAM F 76 Nature de Luxe ".
  • a quantitative assessment of this fining effect is possible in accordance with DIN 10504 using a special color rendering index for meat R FF .
  • the measured spectral distribution of a lamp is used to calculate how strongly the color impression of a particular test color, which reflects the idealized reflectivity of fresh meat and is also defined in DIN 10504, changes.
  • the index R FF has a value of 100, the value decreases with increasing fining effect.
  • the index R FF should not fall below 65 in order not to allow misleading coverage of food hygiene defects. Nevertheless, there is an unmistakable tendency on the market to use lamps that show an even stronger fining effect.
  • the two radiation bands of the Sb 3+ and Mn 2+ of the halophosphates are suitable in fluorescent lamps for meat and sausage products as desired emissions in the blue and yellow-green spectral range.
  • the proportions of the two emission bands can be set favorably by selecting one or more habophosphate phosphors with suitable color temperatures.
  • the desired increased emission in the deep red area must now be added.
  • certain phosphors that have a deep red emission with a maximum at about 650 nm are added in a relatively large amount of over 20%. It is magnesium arsenate or magnesium fluorogermanate activated with tetravalent manganese. The emission of the latter is shown in Figure 1.
  • the magnesium arsenate phosphor is due to its arsenic content for environmental reasons disadvantageous (and is no longer used today). This There is no problem with the magnesium fluorogermanate phosphor; however, it is - at least when used in large quantities - because of the high Cost of the germanium contained disadvantageous. Another disadvantage is that this phosphor gives rise to faulty - cracked and grainy - Fluorescent layers exist when coating the lamps (like today preferably) is carried out with water-based phosphor suspensions.
  • the invention is therefore based on the technical problem of a phosphor mixture and a fluorescent lamp, preferably for lighting of meat and sausages to indicate the achievement of a relative pronounced fining effect with good other technical properties allowed.
  • this object is achieved by a phosphor mixture as set out in claim 1.
  • a cheap choice for such a red phosphor is an Mn 2+ -activated pentaborate, as described in European patent 0 023 068.
  • the spectrum of this pentaborate phosphor is also shown in FIG. 1.
  • narrow-band green phosphor the combination of the other phosphor components being adapted so that the color locus of the lamp does not change changed.
  • narrowband here means in particular a half width of 50 nm and below.
  • the fining effect increases with an increasing proportion of green phosphor. This result is surprising because an enhancement of the fining effect suggests an enhancement of the deep red and blue areas and not a green component.
  • the inventors' investigations have shown that, in order to maintain the target color location, the proportions of the other constituents of the phosphor mixture can be adjusted to compensate for the green component in such a way that there is an increase in the beautifying effect and a lowering of the special color rendering index R FF without too much Purple tinge and a correspondingly deteriorated color rendering quality.
  • Green fluorescent materials suitable for this purpose are, for example, manganese-activated zinc silicate (Willemit) or the cermagnesium aluminate (CAT), lanthanum phosphate (LAP) or cermagnesium pentaborate (CBT) known for three-band lamps.
  • Other terbium-activated phosphors are also suitable. Small amounts of the green phosphor of less than or equal to 20% by weight are sufficient and preferred. A proportion of less than or equal to 10% by weight is further preferred.
  • the optimum proportion of green fluorescent substance depends on the given beautifying effect (R ) from the target color location. The larger the y coordinates of the target color location, the larger the optimal proportion of the green phosphor. For certain applications and target color locations, a proportion of green phosphor of 0% by weight is preferred, the phosphor mixture containing one component less and the production being simplified and cheaper.
  • the preferred proportion of halophosphate phosphor or the mixture of Halophosphate phosphors on the total phosphor mixture is 20 80% by weight, preferably 30-60% by weight.
  • the preferred values according to the invention of the manganese-activated described Pentaborates are 20-80% by weight, preferably 40-65% by weight.
  • the fluorescent lamp with a uniform layer of the phosphor mixture according to the invention is coated.
  • fluorescent lamps to be successively provided with 2 each thinner phosphor layers.
  • the layer thicknesses are usually selected so that the inner, layer closer to the discharge about 80 - 90% of the UV excitation radiation absorbed and the outer the rest.
  • the advantage of this method lies once in the more favorable drying conditions: 2 thin layers in succession are easier to dry than a thick one.
  • Another preferred embodiment of the present invention is therefore, the lamps according to the invention in such a double-layer technology to manufacture. It is initially inexpensive halophosphate as the outer Phosphor layer applied and then the mixture of the inner layer remaining components, ie the or the other halophosphates, the manganese activated pentaborate and possibly a small amount a narrow-band green fluorescent.
  • the invention does not fundamentally exclude the addition of further phosphors, in particular not the addition of the deep red phosphors activated with tetravalent manganese mentioned at the beginning.
  • the amounts of these phosphors can be reduced, which is a great advantage over the prior art.
  • fluorescent lamps in which inert, i.e. non-luminescent materials are added to the phosphor layer (s) are.
  • Fluorescent lamps in which additional layers of inert materials are applied in particular Fluorescent lamps with a thin layer of metal oxide, especially ⁇ - Aluminum oxide between glass and phosphor layer.
  • a special color rendering index R FF of 70 was determined on the finished lamp.
  • the phosphor layer contains this lamp 64.3% by weight of inexpensive halophosphate phosphors (blue + warm white), while in the first embodiment in single-layer technology the proportion of inexpensive halophosphate phosphors only 47.5 % By weight.
  • the economic advantage of the double-layer design is immediately apparent.

Landscapes

  • Luminescent Compositions (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Coloring Foods And Improving Nutritive Qualities (AREA)
EP99119226A 1998-09-30 1999-09-28 Composition luminescente et lampe fluorescente pour l'illumination des produits alimentaires Withdrawn EP0990691A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1998144879 DE19844879A1 (de) 1998-09-30 1998-09-30 Leuchtstoffmischung und Leuchtstofflampe für Lebensmittelbeleuchtung
DE19844879 1998-09-30

Publications (2)

Publication Number Publication Date
EP0990691A2 true EP0990691A2 (fr) 2000-04-05
EP0990691A3 EP0990691A3 (fr) 2002-01-16

Family

ID=7882822

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99119226A Withdrawn EP0990691A3 (fr) 1998-09-30 1999-09-28 Composition luminescente et lampe fluorescente pour l'illumination des produits alimentaires

Country Status (2)

Country Link
EP (1) EP0990691A3 (fr)
DE (1) DE19844879A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1184892A2 (fr) * 2000-08-30 2002-03-06 General Electric Company Lampe fluorescente pour éclairage d'épicerie
DE202019001043U1 (de) 2019-03-06 2019-04-10 Edgar Hakemann Verkaufsmöbel mit Beleuchtung

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011103639A1 (de) * 2011-06-08 2012-12-13 Diehl Aerospace Gmbh Leuchte und Verfahren zur Erzeugung eines Leuchteffekts auf einer reflektierenden Oberfläche mittels einer Leuchte

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4602188A (en) * 1982-07-30 1986-07-22 U.S. Philips Corporation Low-pressure mercury vapor discharge lamp
EP0425830A1 (fr) * 1989-10-24 1991-05-08 General Electric Company Diminution de la condensation de mercure dans des lampes fluorescentes à deux couches
US5612590A (en) * 1995-12-13 1997-03-18 Philips Electronics North America Corporation Electric lamp having fluorescent lamp colors containing a wide bandwidth emission red phosphor
WO1998036441A1 (fr) * 1997-02-13 1998-08-20 Matsushita Electric Industrial Co., Ltd. Lampe fluorescente et lampe aux halogenures

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4602188A (en) * 1982-07-30 1986-07-22 U.S. Philips Corporation Low-pressure mercury vapor discharge lamp
EP0425830A1 (fr) * 1989-10-24 1991-05-08 General Electric Company Diminution de la condensation de mercure dans des lampes fluorescentes à deux couches
US5612590A (en) * 1995-12-13 1997-03-18 Philips Electronics North America Corporation Electric lamp having fluorescent lamp colors containing a wide bandwidth emission red phosphor
WO1998036441A1 (fr) * 1997-02-13 1998-08-20 Matsushita Electric Industrial Co., Ltd. Lampe fluorescente et lampe aux halogenures
EP0896361A1 (fr) * 1997-02-13 1999-02-10 Matsushita Electric Industrial Co., Ltd. Lampe fluorescente et lampe aux halogenures

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1184892A2 (fr) * 2000-08-30 2002-03-06 General Electric Company Lampe fluorescente pour éclairage d'épicerie
EP1184892A3 (fr) * 2000-08-30 2003-12-03 General Electric Company Lampe fluorescente pour éclairage d'épicerie
DE202019001043U1 (de) 2019-03-06 2019-04-10 Edgar Hakemann Verkaufsmöbel mit Beleuchtung

Also Published As

Publication number Publication date
EP0990691A3 (fr) 2002-01-16
DE19844879A1 (de) 2000-04-06

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