EP1407473A1 - Use of a uva illuminant - Google Patents

Use of a uva illuminant

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Publication number
EP1407473A1
EP1407473A1 EP02742806A EP02742806A EP1407473A1 EP 1407473 A1 EP1407473 A1 EP 1407473A1 EP 02742806 A EP02742806 A EP 02742806A EP 02742806 A EP02742806 A EP 02742806A EP 1407473 A1 EP1407473 A1 EP 1407473A1
Authority
EP
European Patent Office
Prior art keywords
phosphor
uva
radiation
discharge
discharge lamp
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Withdrawn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
EP02742806A
Other languages
German (de)
French (fr)
Inventor
Gerhard DÖLL
Reinhard Lecheler
Ulrich Müller
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.)
Osram 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 EP1407473A1 publication Critical patent/EP1407473A1/en
Withdrawn legal-status Critical Current

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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, 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
    • C09K11/7715—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing cerium
    • C09K11/7721—Aluminates
    • 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 the generation of UVA radiation with a phosphor according to the preamble of claim 1.
  • UVA radiation can be generated by phosphors if they have been excited with shorter, wavy radiation. It is known to excite aluminate phosphors with conventional UV radiation from a low-pressure mercury discharge, that is to say from an Hg discharge (main excitation wavelength of approximately 254 nm). Reference is made to US 4 216 408, US 4 153 572 and US 4088922.
  • the invention is based on the technical problem of specifying an expanded possibility for generating UVA radiation with a phosphor.
  • the invention relates to the use of an aluminate phosphor described in more detail in claim 1 for excitation with short-wave UV radiation with a wavelength below 200 nm, so-called VUV radiation.
  • the invention is also directed to a discharge lamp with the phosphor described, which is designed for VUV excitation of the phosphor, to a tanning device with such a discharge lamp and to the use of such a discharge lamp for photocatalytic cleaning.
  • aluminate phosphor generally described in claim 1 is known as a substance. However, it was not previously known that this phosphor can be excited well in the VUV range. Rather, it has been assumed that the excitability decreases towards short UV wavelengths.
  • the phosphor is generally characterized by the empirical formula Ce a -cYbRcMgdAl 11 O 1 6.5 + ⁇ , 5 (a + b) -0.5c + d, where R stands for Ba, Ca and / or Sr and for a, b, c, d applies: 0.14 ⁇ a ⁇ 1.00, 0 ⁇ b ⁇ 0.35, 0 ⁇ c ⁇ 0.5a, 0.45 ⁇ d ⁇ 2, a + b ⁇ l.
  • the invention also relates to various preferred higher lower limits or lower upper limits for the parameters a, b, c and d, which are reproduced below:
  • the O portion can deviate somewhat from the specified parameter 11, for example go to about 12.
  • the excitation can preferably take place with a wavelength in the range between 145 and 185 nm, because the phosphor shows a favorable course of the excitability curve in this range.
  • Such radiation can be generated, for example, by an Xe excimer discharge.
  • Such discharges have been generated in the past few years with dielectrically impeded discharges, for which reference is made to the relevant prior art.
  • the dielectrically impeded discharges can be generated with a particularly high degree of efficiency using a pulsed operating method, in that typical discharge structures with a comparatively low current density are formed which, moreover, enable radiation that is both homogeneous in terms of time and location.
  • US Pat. No. 5,714,835. If an Xe excimer discharge, for example of Xe 2 *, is used in this way, molecular band radiation in the range of approximately 172 nm occurs, that is to say in the preferred excitation range mentioned. This radiation affects the range of the optimal excitability of the phosphor according to the invention relatively well.
  • a preferred aspect of the invention is directed to the fact that the UVA radiation generated by the described phosphor is used to excite a further phosphor.
  • This can be of interest if, on the one hand, a certain UVA-stimulable phosphor is of interest, and on the other hand, the advantages of, for example, a pulsed dielectric barrier discharge are to be exploited.
  • This is also of interest if a phosphor is to be excited at a point to which the discharge that generates the VUV radiation cannot be coupled directly.
  • the VUV radiation is strongly absorbed by air and can therefore can only be relayed by vacuum. However, this does not apply to UVA radiation.
  • UVA radiation can be generated with the phosphor according to the invention via a VUV excitation and this UVA radiation from the UVA lamp thus formed are transferred from the air or possibly other media to the UVA-stimulable phosphor.
  • This can be of interest if the known advantages of a dielectrically impeded discharge compared to a conventional Hg discharge are of interest. These advantages include the fact that the luminance of the discharge is hardly temperature-dependent, so there is practically no start-up behavior and the discharge lamps also have an extraordinarily high switching stability and service life.
  • the UVA range in question is at wavelengths of around 300-380 nm.
  • the invention relates not only to the use of the aluminate phosphor described for excitation with short-wave UV radiation (wavelength ⁇ 200 nm), but also to discharge lamps in which VUV excitation can take place and that with the aluminate phosphor described are provided.
  • Such discharge lamps can find various preferred applications. They can be designed, for example, as a signaling device or, in the manner described, as an excitation source for a display operated with UVA-stimulable phosphors. But they can also be designed as UVA emitters, for example for a tanning device that should also be protected. In the case of sunlamps, solariums and comparable tanning facilities, UVA radiation is required and is also available the flat design achievable with dielectrically disabled discharge lamps. In addition, a precise control of the emitted dose is necessary there, so that the start-up behavior of conventional discharges is disruptive. In addition, a long service life and very good maintenance are of interest in this area of application. In addition, for environmental reasons, it is desirable not to bring the element Hg into circulation in products wherever possible.
  • Another aspect of the invention relates to the use of the aforementioned UVA lamp for photocatalytic cleaning. Namely, it has been shown that this UVA lamp is particularly suitable for this, in particular if titanium oxide is used as the catalyst. Such a catalyst is suitable for breaking up carbon compounds, in particular soot, when irradiated with the UVA lamp.
  • the curve is normalized in the usual way to the values of Na salycilate.
  • the irregular curve at around 165 nm is measurement-related and results from an overload due to the resonance peak of the exciting deuterium lamp. It can clearly be seen that the excitability drops sharply between 230 nm and 220 nm, as was already known per se. However, it rises again between 200 nm and 180 nm to values that are practically equivalent to those in the range around 250 nm.
  • the excitability is very high, especially in the wavelength range of interest for the Xe 2 * discharge. In contrast, the drop to lower wavelengths below 150 nm plays no role.
  • ⁇ stands for the radiation flux, namely for the new lamps, after 100 operating hours, 500 operating hours and 1,000 operating hours, whereby on the one hand the direct measured values are shown in relative units and on the other hand the values normalized to the initial value are shown in percent after the passage of time. The determined values for maintenance and diversification are assessed as favorable.

Abstract

The invention relates to the use of an aluminate illuminant CeYRMgAlO, wherein R represents Ba, Ca and/or Sr, for excitation using VUV radiation. The invention also relates to a corresponding discharge lamp and a correspondingly configured tanning device.

Description

Verwendung eines UVA-LeuchtstoffsUse of a UVA phosphor
Technisches GebietTechnical field
Die Erfindung betrifft die Erzeugung von UVA-Strahlung mit einem Leuchtstoff gemäß dem Oberbegriff des Anspruchs 1.The invention relates to the generation of UVA radiation with a phosphor according to the preamble of claim 1.
Stand der TechnikState of the art
UVA-Strahlung kann durch Leuchtstoffe dann erzeugt werden, wenn diese mit kürzer welliger Strahlung angeregt worden sind. Dabei ist es bekannt, Aluminatleuchtstoffe mit konventioneller UV-Strahlung aus einer Quecksilber-Niederdruckentladung, also aus einer Hg-Entladung anzuregen, (Hauptanregungswellenlänge von etwa 254 nm). Es wird verwiesen auf die US 4 216 408, die US 4 153 572 sowie die US 4088922.UVA radiation can be generated by phosphors if they have been excited with shorter, wavy radiation. It is known to excite aluminate phosphors with conventional UV radiation from a low-pressure mercury discharge, that is to say from an Hg discharge (main excitation wavelength of approximately 254 nm). Reference is made to US 4 216 408, US 4 153 572 and US 4088922.
Darstellung der ErfindungPresentation of the invention
Der Erfindung liegt das technische Problem zugrunde, eine erweiterte Mög- lichkeit zur Erzeugung von UVA-Strahlung mit einem Leuchtstoff anzugeben.The invention is based on the technical problem of specifying an expanded possibility for generating UVA radiation with a phosphor.
Die Erfindung richtet sich auf die Verwendung eines in Anspruch 1 näher beschriebenen Aluminatleuchtstoffs für eine Anregung mit kurzwelliger UV- Strahlung mit einer Wellenlänge unter 200 nm, sog. VUV-Strahlung. Daneben richtet sich die Erfindung auch auf eine Entladungslampe mit dem beschriebenen Leuchtstoff, die für eine VUV- Anregung des Leuchtstoffs ausgelegt ist, auf eine Bräunungseinrichtung mit einer solchen Entladungslampe sowie auf die Verwendung einer solchen Entladungslampe für photokataly- tische Reinigung.The invention relates to the use of an aluminate phosphor described in more detail in claim 1 for excitation with short-wave UV radiation with a wavelength below 200 nm, so-called VUV radiation. In addition, the invention is also directed to a discharge lamp with the phosphor described, which is designed for VUV excitation of the phosphor, to a tanning device with such a discharge lamp and to the use of such a discharge lamp for photocatalytic cleaning.
Es wird davon ausgegangen, dass der in Anspruch 1 allgemein beschriebene Aluminatleuchtstoff als Stoff bekannt ist. Allerdings war bisher nicht bekannt, dass sich dieser Leuchtstoff im VUV-Bereich gut anregen lässt. Vielmehr ist man davon ausgegangen, dass die Anregbarkeit zu kurzen UV- Wellenlängen hin abnimmt.It is believed that the aluminate phosphor generally described in claim 1 is known as a substance. However, it was not previously known that this phosphor can be excited well in the VUV range. Rather, it has been assumed that the excitability decreases towards short UV wavelengths.
Es hat sich nun überraschend herausgestellt, dass die Anregbarkeit dieses Leuchtstoffs bei kurzen UV-Wellenlängen, also im sogenannten VUV- Bereich, wieder ansteigt und dieser Leuchtstoff damit hervorragend für die Erzeugung von UVA-Strahlung aus VUV-Stahlung geeignet ist.It has now surprisingly been found that the excitability of this phosphor increases again at short UV wavelengths, that is to say in the so-called VUV range, and this phosphor is therefore outstandingly suitable for generating UVA radiation from VUV radiation.
Gemäß Anspruch 1 ist der Leuchtstoff allgemein gekennzeichnet durch die Summenformel Cea-cYbRcMgdAl11O16,5+ι,5(a+b)-0,5c+d, wobei R für Ba, Ca und / oder Sr steht und für a, b, c, d gilt: 0,14 ≤ a ≤ 1,00, 0 ≤ b ≤ 0,35, 0 ≤ c ≤ 0,5a, 0,45 ≤ d ≤ 2, a + b ≤ l.According to claim 1, the phosphor is generally characterized by the empirical formula Ce a -cYbRcMgdAl 11 O 1 6.5 + ι, 5 (a + b) -0.5c + d, where R stands for Ba, Ca and / or Sr and for a, b, c, d applies: 0.14 ≤ a ≤ 1.00, 0 ≤ b ≤ 0.35, 0 ≤ c ≤ 0.5a, 0.45 ≤ d ≤ 2, a + b ≤ l.
Die Erfindung betrifft jedoch auch verschiedene bevorzugte höhere Unter- grenzen bzw. niedrigere Obergrenzen für die Parameter a, b, c und d, die im folgenden wiedergegeben sind:However, the invention also relates to various preferred higher lower limits or lower upper limits for the parameters a, b, c and d, which are reproduced below:
0,5 ≤ a ≤ l,00; 0 ≤ b ≤ 0,20; 0 ≤ c ≤ 0,2a; 0,50 ≤d ≤ 1,500.5 ≤ a ≤ 1.00; 0 ≤ b ≤ 0.20; 0 ≤ c ≤ 0.2a; 0.50 ≤d ≤ 1.50
bzw.respectively.
0,80 ≤ a ≤ 1,00; 0 ≤ b ≤ 0,05; 0 ≤ c ≤ 0,1a; 0,90 ≤ d ≤ 1,10. Außerdem kann der O- An teil etwas von dem angegebenen Parameter 11 abweichen, z.B. bis etwa 12 gehen.0.80 ≤ a ≤ 1.00; 0 ≤ b ≤ 0.05; 0 ≤ c ≤ 0.1a; 0.90 ≤ d ≤ 1.10. In addition, the O portion can deviate somewhat from the specified parameter 11, for example go to about 12.
Die Anregung kann vorzugsweise mit einer Wellenlänge im Bereich zwischen 145 und 185 nm erfolgen, weil der Leuchtstoff in diesem Bereich einen günstigen Verlauf der Anregbarkeitskurve zeigt.The excitation can preferably take place with a wavelength in the range between 145 and 185 nm, because the phosphor shows a favorable course of the excitability curve in this range.
Solche Strahlung kann beispielsweise durch eine Xe-Excimerentladung erzeugt werden. Solche Entladungen sind in den vergangenen Jahren mit dielektrisch behinderten Entladungen erzeugt worden, wozu auf den einschlägigen Stand der Technik verwiesen wird. Mit besonders gutem Wirkungs- grad lassen sich die dielektrisch behinderten Entladungen mit einem gepulsten Betriebsverfahren erzeugen, indem sich typische Entladungsstrukturen mit einer vergleichsweise niedrigen Stromdichte ausbilden, die im übrigen sowohl zeitlich als auch örtlich homogene Strahlungserzeugung ermöglichen. Hierzu wird verwiesen auf die US 5 714 835. Wenn in dieser Weise eine Xe-Excimerentladung eingesetzt wird, etwa von Xe2*, so tritt eine molekulare Bandenstrahlung im Bereich von etwa 172 nm auf, also in dem erwähnten bevorzugten Anregungsbereich. Diese Strahlung trifft relativ gut den Bereich der optimalen Anregbarkeit des erfindungsgegenständlichen Leuchtstoffs.Such radiation can be generated, for example, by an Xe excimer discharge. Such discharges have been generated in the past few years with dielectrically impeded discharges, for which reference is made to the relevant prior art. The dielectrically impeded discharges can be generated with a particularly high degree of efficiency using a pulsed operating method, in that typical discharge structures with a comparatively low current density are formed which, moreover, enable radiation that is both homogeneous in terms of time and location. For this, reference is made to US Pat. No. 5,714,835. If an Xe excimer discharge, for example of Xe 2 *, is used in this way, molecular band radiation in the range of approximately 172 nm occurs, that is to say in the preferred excitation range mentioned. This radiation affects the range of the optimal excitability of the phosphor according to the invention relatively well.
Ein bevorzugter Aspekt der Erfindung richtet sich darauf, dass die von dem beschriebenen Leuchtstoff erzeugte UVA-Strahlung zur Anregung eines weiteren Leuchtstoffs verwendet wird. Dies kann von Interesse sein, wenn einerseits ein bestimmter UVA-anregbarer Leuchtstoff von Interesse ist, andererseits die Vorteile beispielsweise einer gepulsten dielektrisch behinderten Entladung ausgenutzt werden sollen. Dies ist auch dann von Interesse, wenn ein Leuchtstoff an einer Stelle angeregt werden soll, an die man mit der die VUV-Strahlung erzeugenden Entladung nicht unmittelbar ankoppeln kann. Die VUV-Strahlung wird nämlich von Luft stark absorbiert und kann daher nur durch Vakuum weitergeleitet werden. Dies gilt jedoch nicht für UVA- Strahlung. Wenn also beispielsweise in einem Display sichtbares Licht erzeugt werden soll und dazu ein bestimmter UVA-anregbarer Leuchtstoff geeignet ist, so kann mit dem erfindungsgemäßen Leuchtstoff über eine VUV-Anregung UVA-Strahlung erzeugt werden und diese UVA-Strahlung von der somit gebildeten UVA-Lampe aus durch Luft oder gegebenenfalls andere Medien zu dem UVA-anregbaren Leuchtstoff übertragen werden. Von Interesse kann das dann sein, wenn die an sich vorbekannten Vorteile einer dielektrisch behinderten Entladung im Vergleich zu einer konventio- nellen Hg-Entladung von Interesse sind. Diese Vorteile bestehen u.a. darin, dass die Leuchtdichte der Entladung kaum temperaturabhängig ist, somit praktisch kein Anlaufverhalten auftritt und die Entladungslampen im übrigen eine außerordentlich hohe Schaltfestigkeit und Lebensdauer aufweisen.A preferred aspect of the invention is directed to the fact that the UVA radiation generated by the described phosphor is used to excite a further phosphor. This can be of interest if, on the one hand, a certain UVA-stimulable phosphor is of interest, and on the other hand, the advantages of, for example, a pulsed dielectric barrier discharge are to be exploited. This is also of interest if a phosphor is to be excited at a point to which the discharge that generates the VUV radiation cannot be coupled directly. The VUV radiation is strongly absorbed by air and can therefore can only be relayed by vacuum. However, this does not apply to UVA radiation. If, for example, visible light is to be generated in a display and a certain UVA-stimulable phosphor is suitable for this purpose, then UVA radiation can be generated with the phosphor according to the invention via a VUV excitation and this UVA radiation from the UVA lamp thus formed are transferred from the air or possibly other media to the UVA-stimulable phosphor. This can be of interest if the known advantages of a dielectrically impeded discharge compared to a conventional Hg discharge are of interest. These advantages include the fact that the luminance of the discharge is hardly temperature-dependent, so there is practically no start-up behavior and the discharge lamps also have an extraordinarily high switching stability and service life.
Der in Betracht kommende UVA-Bereich liegt bei Wellenlängen von etwa 300 - 380 nm.The UVA range in question is at wavelengths of around 300-380 nm.
Die Erfindung bezieht sich, wie eingangs bereits festgestellt, nicht nur auf die Verwendung des beschriebenen Aluminatleuchtstoffs bei Anregung mit kurzwelliger UV-Strahlung (Wellenlänge < 200nm), sondern auch auf Entladungslampen, in denen eine VUV-Anregung stattfinden kann und die mit dem beschriebenen Aluminatleuchtstoff versehen sind.As already stated at the beginning, the invention relates not only to the use of the aluminate phosphor described for excitation with short-wave UV radiation (wavelength <200 nm), but also to discharge lamps in which VUV excitation can take place and that with the aluminate phosphor described are provided.
Solche Entladungslampen können verschiedene bevorzugte Anwendungen finden. Sie können beispielsweise als Signaleinrichtung ausgebildet sein oder in der beschriebenen Weise als Anregungsquelle für ein mit UVA anregbaren Leuchtstoffen betriebenes Display. Sie können aber auch als UVA-Strahler ausgebildet sein, etwa für eine Bräunungseinrichtung, die ebenfalls geschützt sein soll. Bei Höhensonnen, Solarien und vergleichbaren Bräunungseinrichtungen wird nämlich UVA-Strahlung benötigt und bietet sich andererseits die mit dielektrisch behinderten Entladungslampen erzielbare flache Bauform an. Außerdem ist dort eine genaue Kontrolle der abgestrahlten Dosis notwendig, so dass das Anlaufverhalten konventioneller Entladungen störend ist. Im übrigen ist eine hohe Lebensdauer und sehr gute Maintenance in diesem Anwendungsbereich von Interesse. Außerdem ist aus Umweltschutzgründen erwünscht, das Element Hg möglichst nicht in Produkten in Umlauf zu bringen.Such discharge lamps can find various preferred applications. They can be designed, for example, as a signaling device or, in the manner described, as an excitation source for a display operated with UVA-stimulable phosphors. But they can also be designed as UVA emitters, for example for a tanning device that should also be protected. In the case of sunlamps, solariums and comparable tanning facilities, UVA radiation is required and is also available the flat design achievable with dielectrically disabled discharge lamps. In addition, a precise control of the emitted dose is necessary there, so that the start-up behavior of conventional discharges is disruptive. In addition, a long service life and very good maintenance are of interest in this area of application. In addition, for environmental reasons, it is desirable not to bring the element Hg into circulation in products wherever possible.
Ein weiterer erfindungsgemäßer Aspekt betrifft die Verwendung des vorgenannten UVA-Strahlers zur photokatalytischen Reinigung. Es hat sich näm- lieh gezeigt, dass sich dieser UVA-Strahler hierfür besonders gut eignet, insbesondere wenn als Katalysator Titanoxid verwendet wird. Ein derartiger Katalysator eignet sich bei Bestrahlung mit dem UVA-Strahler zum Aufbrechen von Kohlenstoffverbindungen, insbesondere Ruß.Another aspect of the invention relates to the use of the aforementioned UVA lamp for photocatalytic cleaning. Namely, it has been shown that this UVA lamp is particularly suitable for this, in particular if titanium oxide is used as the catalyst. Such a catalyst is suitable for breaking up carbon compounds, in particular soot, when irradiated with the UVA lamp.
Beschreibung der ZeichnungDescription of the drawing
Im folgenden wird die Erfindung anhand eines Ausführungsbeispiels näher erläutert, wobei die Figur eine Messkurve der Anregbarkeit des erfindungsgemäßen Leuchtstoffs im VUV-Bereich (Wellenlänge < 200 nm) und UV- Bereich (Wellenlänge 200-260 nm) zeigt.The invention is explained in more detail below using an exemplary embodiment, the figure showing a measurement curve of the excitability of the phosphor according to the invention in the VUV range (wavelength <200 nm) and UV range (wavelength 200-260 nm).
Die Figur zeigt die relative Anregbarkeit des erfindungsgemäßen Leuchtstoffs mit folgender genauer Zusammensetzung: Ceo,9θ Bao.osMgAlπOis, 90, d.h. a = 0,95, b = 0, c = 0,05, d = 1.The figure shows the relative excitability of the phosphor according to the invention with the following precise composition: Ceo, 9θ Bao.osMgAlπOis, 90, i.e. a = 0.95, b = 0, c = 0.05, d = 1.
Die Kurve ist in der üblichen Weise normiert auf die Werte von Na-Salycilat. Der irreguläre Kurvenverlauf bei etwa 165 nm ist messtechnisch bedingt und resultiert aus einer Übersteuerung durch den Resonanzpeak der anregenden Deuteriumlampe. Man erkennt deutlich, dass die Anregbarkeit zwischen 230 nm und 220 nm stark abfällt, wie dies an sich bereits bekannt war. Allerdings steigt sie zwischen 200 nm und 180 nm wieder auf Werte an, die denen im Bereich um 250 nm praktisch gleichkommen. Gerade in dem für die Xe2*-Entladung interes- sierenden Wellenlängenbereich ist damit die Anregbarkeit sehr hoch. Der Abfall zu niedrigeren Wellenlängen unter 150 nm spielt demgegenüber keine Rolle.The curve is normalized in the usual way to the values of Na salycilate. The irregular curve at around 165 nm is measurement-related and results from an overload due to the resonance peak of the exciting deuterium lamp. It can clearly be seen that the excitability drops sharply between 230 nm and 220 nm, as was already known per se. However, it rises again between 200 nm and 180 nm to values that are practically equivalent to those in the range around 250 nm. The excitability is very high, especially in the wavelength range of interest for the Xe 2 * discharge. In contrast, the drop to lower wavelengths below 150 nm plays no role.
In der folgenden Tabelle wird das sogenannte Maintenance- Verhalten dieses Leuchtstoffs in dielektrisch behinderten Xe2*-Entladungslampen dargestellt. Φ steht dabei für den Strahlungsfluß, und zwar bei den neuen Lampen, nach 100 Betriebsstunden, 500 Betriebsstunden sowie 1.000 Betriebsstunden, wobei zum einen die direkten Messwerte in relativen Einheiten und andererseits die auf den Anfangswert normierten Werten nach Zeitablauf in Prozent dargestellt sind. Die ermittelten Werte für Maintenance und Streuung wer- den als günstig beurteilt. The following table shows the so-called maintenance behavior of this phosphor in dielectric-disabled Xe2 * discharge lamps. Φ stands for the radiation flux, namely for the new lamps, after 100 operating hours, 500 operating hours and 1,000 operating hours, whereby on the one hand the direct measured values are shown in relative units and on the other hand the values normalized to the initial value are shown in percent after the passage of time. The determined values for maintenance and diversification are assessed as favorable.

Claims

Patentansprüche claims
1. Verwendung eines Aluminatleuchtstoffs der Summenformel1. Use of an aluminate phosphor of the empirical formula
Cea-cYbRcMgdAl11O16,5+l,5(a+b)-0,5c+dCe a -cYbRcMgdAl 11 O 1 6.5 + l.5 (a + b) -0.5c + d
wobei R für Ba, Ca und /oder Sr stehtwhere R is Ba, Ca and / or Sr
und für a, b, c, d gilt:and for a, b, c, d:
0,14 ≤ a ≤ 1,000.14 ≤ a ≤ 1.00
0 ≤ b ≤ 0,350 ≤ b ≤ 0.35
0 ≤ c ≤ 0,5a0 ≤ c ≤ 0.5a
0,45 ≤ d ≤ 20.45 ≤ d ≤ 2
a + b ≤ la + b ≤ l
für eine Anregung des Leuchtstoffs mit VUV-Strahlung.for excitation of the phosphor with VUV radiation.
2. Verwendung nach Anspruch 1, bei der der Anregungsbereich zwischen 145 und 185 nm liegt.2. Use according to claim 1, wherein the excitation range is between 145 and 185 nm.
3. Verwendung nach Anspruch 2, bei der die anregende Strahlung durch eine Xe-Excimerentladung erzeugt wird.3. Use according to claim 2, wherein the exciting radiation is generated by a Xe excimer discharge.
4. Verwendung nach Anspruch 1, 2 oder 3, bei der die anregende Strahlung durch eine gepulst betriebene Gasentladung erzeugt wird. 4. Use according to claim 1, 2 or 3, in which the exciting radiation is generated by a pulsed gas discharge.
5. Verwendung nach einem der vorstehenden Ansprüche, bei der die von dem Leuchtstoff erzeugte UVA-Strahlung zur Anregung eines weiteren Leuchtstoffes verwendet wird.5. Use according to one of the preceding claims, in which the UVA radiation generated by the phosphor is used to excite a further phosphor.
6. Verwendung nach Anspruch 5, bei der der weitere Leuchtstoff sicht- bares Licht erzeugt.6. Use according to claim 5, in which the further phosphor generates visible light.
7. Entladungslampe, bei der der in Anspruch 1 beschriebene Leuchtstoff nach einem der Ansprüche 1 bis 6 verwendet wird.7. Discharge lamp, in which the phosphor described in claim 1 is used according to one of claims 1 to 6.
8. Entladungslampe nach Anspruch 7, die als Signaleinrichtung ausgebildet ist.8. Discharge lamp according to claim 7, which is designed as a signal device.
9. Entladungslampe nach Anspruch 7, jedoch nicht in Verbindung mit Anspruch 6, die als UVA-Strahler ausgebildet ist.9. Discharge lamp according to claim 7, but not in connection with claim 6, which is designed as a UVA lamp.
10. Verwendung einer Entladungslampe nach Anspruch 9 für eine Bräunungseinrichtung.10. Use of a discharge lamp according to claim 9 for a tanning device.
11. Bräunungseinrichtung mit einer Entladungslampe nach Anspruch 9.11. tanning device with a discharge lamp according to claim 9.
12. einer Entladungslampe nach Anspruch 9 für photokatalytische Reinigung.12. A discharge lamp according to claim 9 for photocatalytic cleaning.
13. Verwendung nach Anspruch 12 in Verbindung mit einem Titanoxid- Katalysator. 13. Use according to claim 12 in conjunction with a titanium oxide catalyst.
EP02742806A 2001-07-13 2002-06-12 Use of a uva illuminant Withdrawn EP1407473A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10133411A DE10133411A1 (en) 2001-07-13 2001-07-13 Use of aluminate luminescent material for exciting with vacuum ultra violet radiation
DE10133411 2001-07-13
PCT/DE2002/002142 WO2003007333A1 (en) 2001-07-13 2002-06-12 Use of a uva illuminant

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EP1407473A1 true EP1407473A1 (en) 2004-04-14

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US (1) US20040012325A1 (en)
EP (1) EP1407473A1 (en)
JP (1) JP2004521183A (en)
KR (1) KR20040030407A (en)
CA (1) CA2422511A1 (en)
DE (1) DE10133411A1 (en)
TW (1) TWI229121B (en)
WO (1) WO2003007333A1 (en)

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US8152586B2 (en) 2008-08-11 2012-04-10 Shat-R-Shield, Inc. Shatterproof light tube having after-glow
JP5370299B2 (en) * 2009-12-16 2013-12-18 ウシオ電機株式会社 Fluorescent lamp

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TWI229121B (en) 2005-03-11
KR20040030407A (en) 2004-04-09
US20040012325A1 (en) 2004-01-22
DE10133411A1 (en) 2003-01-23
CA2422511A1 (en) 2003-01-23
WO2003007333A1 (en) 2003-01-23
JP2004521183A (en) 2004-07-15

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