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
• • 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
  • H05B35/00—Electric light sources using a combination of different types of light generation
• • 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
  • C09K11/7774—Aluminates
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F21—LIGHTING
  • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
  • F21V7/00—Reflectors for light sources
  • F21V7/22—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors
  • F21V7/28—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors characterised by coatings
  • F21V7/30—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors characterised by coatings the coatings comprising photoluminescent substances
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F21—LIGHTING
  • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
  • F21Y2113/00—Combination of light sources
  • F21Y2113/20—Combination of light sources of different form
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F21—LIGHTING
  • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
  • F21Y2115/00—Light-generating elements of semiconductor light sources
  • F21Y2115/10—Light-emitting diodes [LED]

Definitions

• Lighting unit consisting of discharge lamp, LEDs and
• the invention relates to a lighting unit with adjustable color location consisting of a discharge lamp as a primary light source and LEDs as a secondary light source and additionally a phosphor layer in the form of a phosphor screen of conversion phosphors. Furthermore, the present invention relates to a method for illuminating usable areas by the lighting unit according to the invention.
• High Pressure and Low Pressure - Sodium Discharge Lamps are extremely energy efficient.
• the most important field of application of these lamps is the street lighting, because here the high energy efficiency ("luminous efficiency" in Im / W), as well as the very long life expectancy of more than 30,000 hours come into play.
• These lamps are recognizable by the yellow-orange light, which is emitted by them and which is associated with a poor color rendering (the lack of blue and yellow-green portions in the spectrum means that no colors can be seen.)
• the poor color rendering is also a disadvantage for the street lighting segment, as it may cause, e.g. B.
• Na vapor lamps can not be used in segments such as e.g. the greenhouse lighting can be used without additional fluorescent lamps and are not suitable for architectural and general lighting due to the poor color rendering. The reason for the high
• the high pressure sodium vapor lamp also has one
• a lighting system in which in addition to a primary light source additionally monochromatic emitting secondary light sources are provided.
• the intensity of the secondary light sources can be adjusted continuously to change the color location and in particular the color temperature or light color.
• a lighting system with at least one light source is further known to illuminate usable areas, wherein further monochrome emitting light sources (LEDs) are provided in addition to the light source for changing the light spectrum radiated by the light source onto the effective area.
• LEDs monochrome emitting light sources
• Object of the present invention is therefore to develop a lighting unit that eliminates the disadvantage of poor color rendering of sodium vapor lamps, the high energy efficiency is maintained and can be controlled individually by the simple way the color location and in particular the color temperature.
• This object is surprisingly achieved by providing a lighting unit consisting of a discharge lamp, LEDs and additionally a phosphor layer of conversion phosphors. This lighting unit allows the adjustment of the emission spectrum and the adjustment of the color temperature by
• Dimming the LEDs to the respective application generally refers to a change in the driving parameters of the LED. This may be, for example, that the LED is operated continuously with variable currents or is operated with current pulses with variable currentless periods between the current pulses.
• these luminaires have a wide range of applications as highly energy-efficient and with high color rendering lamps.
• the application ranges from improved traffic lighting to architectural lighting and general lighting.
• suitable spectra with, in particular, blue and red parts can be realized, which favorably influence plant growth.
• the subject of the present invention is thus an illumination unit with adjustable color location, with a housing (2) in which at least one primary and one secondary light source is arranged, the color location of both light sources being different and the primary light source (6) being orange-yellow light of a given color location with a given color temperature and light color emitted while the secondary light source
• Output radiation emitted by the illumination unit may differ from the primary light source, characterized in that the Housing located deflection means (4) comprises a phosphor layer (12) containing one or more conversion phosphors, and that this phosphor layer of the secondary light source (10) is excitable to emit radiation whose color location differs from the color locations of the primary and secondary light sources.
• the Housing located deflection means (4) comprises a phosphor layer (12) containing one or more conversion phosphors, and that this phosphor layer of the secondary light source (10) is excitable to emit radiation whose color location differs from the color locations of the primary and secondary light sources.
• the color point area corresponds to the total of the points (x, y) that are located within the area of the CIE diagram, this area being limited by the color dots of the Na vapor lamp, the blue LED and the phosphor or the phosphor mixtures ,
• the color locus is that location in a color space that exactly defines the position of the color of a measurement object (colored light source). According to Grassmann's law, each color space is three-dimensional, so the color location in the defined color space is defined by three coordinates.
• the lighting unit according to the invention consists of a conventional housing for discharge lamps. There are additional LEDs in the housing (see Fig. 1). Here, the blue light of the LEDs and the light of the discharge lamp is mixed in the beam path and directed by the reflector (deflection) on the object to be illuminated.
• n discharge lamp, LED, phosphor 1, phosphor 2, etc.
• the spectrum of the lamps can be adapted to the application.
• an advantageous higher color temperature than conventional sodium lamps because the human eye can see better with bluish light at night.
• the primary light source consists of a discharge lamp, with a
• sodium vapor discharge lamp (6) is preferred.
• sodium vapor discharge lamp is understood to mean high-pressure sodium, medium-pressure and low-pressure lamps which emit yellow light from a gas discharge in sodium vapor, in which the pressure ranges from 100 ⁇ bar to 10 bar
• Sodium vapor lamps no fluorescent phosphor. In these lamps, the gas discharge itself already generates visible light and does not have to be converted into it first.
• the secondary light source consists of at least one light-emitting
• Diode (LED) 10 that emits UV or blue light with wavelengths between 250 to 500 nm.
• the LEDs 10 are symmetrically arranged on the right and left of the primary light source or discharge lamp 6 such that the admixture of the radiation emitted by the LEDs 10 or the radiation emitted by the phosphor layer 12 to the radiation of the discharge lamp 6 below the illumination unit 1 in a Area takes place, which is as close as possible to the secondary light sources 10.
• the phosphor layer 12, which sits on the deflection means 4, is produced by dissolving the microcrystalline phosphor particles having the desired particle size distribution with an arithmetic mean diameter of 0.6 ⁇ m to 70 ⁇ m, preferably between 1 ⁇ m to 25 ⁇ m and particularly preferably 1.2 ⁇ m to 15 .mu.m first be transferred via the methods known to those skilled in the art using substances known in the art in a suspension. Examples of this are described in the specialist literature, for. In Keith H. Butler, Fluorescent Lamp
• This suspension can be formulated on an aqueous or organic basis.
• the phosphor particles are suspended in a dispersant based on acrylate latices, which may contain surfactants, antifoaming agents and antiflocculant additives.
• the phosphor particles may be suspended in a medium based on ethyl cellulose or nitrocellulose as a binder. Possible compositions are, for example, in
• Nitrocellulose trap 5wt% nitrocellulose, 2.5wt% ethanol, 87.5wt% butyl acetate, 5wt% diethyl phthalate, and in the case of the ethylcellulose: 6.2wt% ethylcellulose, 3.2wt % Dibutyl phthalate, 86.3% by weight of xylene, 4.3% by weight of butanol.
• a carrier gas such as air (airbrush), dipping method or with the aid of Inkjet valves and / or needle valves applied to the deflection.
• the phosphors can also be applied dispersedly in epoxy, silicone or acrylate resins to the deflecting means 4, whereby the application can likewise be effected by spraying with or without carrier gas, dipping, inking or needle valves. After application, solidification of the mixture is required due to increased temperature or exposure of the coated diverter
• the phosphor layer may contain additives, such as adhesion promoters for the adhesion of the phosphor layer to the deflection means 4, which may for example consist of ultrafine particles of SiO 2 or Al 2 O 3 .
• additives can also help by refractive index matching to optimize the light coupling and light extraction in or out of the phosphor layer or to optimize the light path in the phosphor layer by scattering processes.
• the phosphor layer 12 includes one or more
• the two different light sources can be controlled advantageously with a single special ballast, especially when using a discharge lamp in combination with multiple LEDs.
• Another object of the present invention is a method for illuminating usable areas by the lighting unit 1 according to the invention, wherein the primary and secondary light source and the deflection means 4 are arranged with the illumination layer 12 such that a multi-band lamp with high color rendering and
• a lighting unit 1 shows a sectional view of a lighting unit 1 according to the invention, comprising a housing 2 with a top wall 3, two side surfaces or deflecting means 4 and a bottom wall 5 and two side walls (not visible).
• the side walls are attached obliquely to the top wall 3.
• the lower wall 5 has a central light exit opening 7, which is closed off by a diffuser plate (diffuser plate) 8.
• a Sodium vapor discharge lamp 6 accommodated on a holder 11, whose light is protected from direct exit through the opening 7 by a cross-sectionally V-shaped reflector 9.
• the yellow light of the sodium vapor discharge lamp serving as the primary light source is directed to the opening 7 via the walls of the housing. Also, at the
• Base wall 5 each four dimmable LEDs 10 (with different emission maxima 445, 460, 468 and 482 nm wavelength) attached to both sides of the sodium vapor discharge lamp 6. These LEDs 10 stimulate the phosphor layer 12 present in the deflection means 4, which contains conversion phosphors.
• Fig. 2 spectrum of the illumination unit 1 according to the invention when using a Na low-pressure discharge lamp with 480 nm LEDs
• Fig. 3 Spectrum of the lighting unit 1 according to the invention
• FIG. 4 shows the achievable color space of the illumination unit 1 according to the invention if a high-pressure sodium vapor lamp and four blue LEDs with emission maxima at 445 nm, 460 nm, 468 nm and 482 nm and a conversion luminescent layer consisting of LuAG: Ce [(Lu, Y ) 3 AI 5 O ⁇ Ce] can be used on the deflection 4.
• Fig. 5 shows the achievable color space of the invention
• Illumination unit 1 if a low pressure sodium vapor lamp and four blue LEDs with emission maxima at 445 nm, 460 nm, 468 mn and 482 nm and a conversion luminescent layer consisting of LuAG: Ce [(Lu 1 Y) 3 Al 5 Oi 2 ICe] on the Deflection means 4 are used.

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Inorganic Chemistry (AREA)
• Materials Engineering (AREA)
• Organic Chemistry (AREA)
• General Engineering & Computer Science (AREA)
• Luminescent Compositions (AREA)
• Non-Portable Lighting Devices Or Systems Thereof (AREA)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

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• 2007
  • 2007-05-14 DE DE102007022566A patent/DE102007022566A1/de not_active Withdrawn
• 2008
  • 2008-04-18 CN CN200880015997A patent/CN101681788A/zh active Pending
  • 2008-04-18 US US12/599,889 patent/US8256920B2/en not_active Expired - Fee Related
  • 2008-04-18 KR KR1020097025942A patent/KR20100025524A/ko not_active Withdrawn
  • 2008-04-18 JP JP2010507812A patent/JP2010527126A/ja active Pending
  • 2008-04-18 WO PCT/EP2008/003144 patent/WO2008138449A1/de not_active Ceased
  • 2008-04-18 EP EP08735327A patent/EP2147454A1/de not_active Withdrawn

Non-Patent Citations (1)

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