Classifications

• • 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
  • F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
  • F21V9/30—Elements containing photoluminescent material distinct from or spaced from the light source
• • 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
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F21—LIGHTING
  • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
  • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
  • F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
  • F21K9/64—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F21—LIGHTING
  • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
  • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
  • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
  • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
  • F21S41/16—Laser light sources
• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
  • G02B27/10—Beam splitting or combining systems
  • G02B27/14—Beam splitting or combining systems operating by reflection only
  • G02B27/141—Beam splitting or combining systems operating by reflection only using dichroic mirrors
• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
  • G02B27/10—Beam splitting or combining systems
  • G02B27/14—Beam splitting or combining systems operating by reflection only
  • G02B27/142—Coating structures, e.g. thin films multilayers
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
  • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps

Definitions

• the invention relates to an arrangement for generating in particular white light, by means of blue light and a converter for converting blue light into yellow light and mixing these spectral components.
• the ratio of blue light component to yellow light component in the generated illumination light depends on the conversion medium, which the incident blue light of a
• the parameters of the converter are exactly complied with, including the doping of the converter material, the light scattering in the converter material and the thickness of the converter. Only by carefully tuning such parameters can the correct spectral ratio of blue to yellow light be achieved and thus obtain white light.
• the invention has for its object to provide an arrangement for adjusting the color locus of light, the larger tolerances in such material parameters as the thickness of the converter, doping of the converter material,
• a blue light excitation light source and a converter for converting substantially all of the blue light into yellow light are provided.
• a holder or carrier directs in a remission geometry the surface of the converter to the excitation light source and also in
• the thickness of the converter is chosen correspondingly large.
• Embodiment of the invention thus penetrates 70% to 90% of the blue light in the converter and is there almost completely converted into yellow light (and heat).
• the optical coating but can be converted light
• Illuminating light which appears blue-yellow white because of the mixture.
• a dichroic layer or even a thin metallic layer can be used as the optical coating.
• specular reflection on a dichroic or metal layer may also be advantageous.
• an antireflection layer (R ⁇ 0.05, better R ⁇ 0.01) is first prepared for the
• Excitation light and the converted light applied to the converter and then the litter layer.
• Optical coating is considered to be regulatory in the
• the stated object can also be achieved without optical coating on the surface of the converter by taking into account the refractive index of the converter medium in determining the correct angle of the excitation light source to the surface of the converter.
• the refractive index of the converter medium in determining the correct angle of the excitation light source to the surface of the converter.
• Reflectance geometry in the illumination direction where it mixes with the reflected blue light of the excitation light source to finally produce a white light impression.
• FIG. 1 shows a section through a converter with a dichroic surface layer and a holder of the converter
• Fig. 2 shows a further section through a converter with a thin metallic surface layer and a holder of the converter
• Fig. 3 is a section through another converter.
• FIG. 1 schematically illustrates an arrangement for producing white light.
• an excitation light source 1 for blue light for example generated by a diode laser
• a converter 2 which has a coating 3 on its surface
• the converter material may be a Ce-YAG ceramic.
• the coating 3 is an optical coating using a dichroic layer or a thin metallic layer. The coating 3 divides the excitation light stream into a reflected light portion and a penetrating one
• Light components is generally maintained an angle not equal to 90 ° of the incident light to the surface of the converter.
• the invading blue light is from the
• Converter 2 is converted into yellow light 6, and more so, the lower the light penetrates into the converter, and discharged as a light lobe, not shown.
• Conversion point is indicated at 60. From there, the converted light spreads to all sides.
• the thickness (d) of the converter is chosen according to the invention at least so large that substantially all light entering the converter is converted.
• the carrier or holder 4 is designed to be reflective to the penetrating blue light 1, but above all
• the proportion of the reflected blue light is determined via the layer composition and layer thickness of the coating 3.
• the reflected light is at 5 and that
• the coating 3 is an optical coating, the formation of which incidentally also of the refractive index of the
• Conversion medium is dependent to reflect the correct proportion at the correct angle, or to let penetrate.
• the optical coating 3 has in the blue
• a preselectable reflection factor in order to arrive at the desired result of the white light when mixing with the emitted yellow part of the light.
• the reflection factor at the optical coating also depends on the angle of incidence on the converter. This will help in the training of
• the converted yellow light should be coupled as completely as possible in a spectral range from 480 nm to 650 nm for an angular distribution of 0 ° to 60 ° to the surface normal of the converter.
• the optical coating is in the spectral range of 480 to 650 nm with a
• Fig. 2 shows an embodiment of the arrangement for
• Adjustment of the color locus of light with a scattering layer 30 The remaining elements correspond to the embodiment according to FIG. 1. Again, the thickness (d) of the converter is chosen to be at least large enough to convert substantially all of the light that enters the converter. The proportion of the reflected blue light is defined by the scattering layer 30.
• the litter layer 30 may, for. B. be a thin white paint. Underneath the scattering layer 30, an antireflection layer may extend, which minimizes unwanted reflection of the excitation light.
• Fig. 3 shows a third embodiment of the invention.
• the blue excitation light 1 is at an angle to the normal on the
• Emission site is shown at 60.
• the converted light spreads out in all places, including in
• Illumination direction as indicated at 6. Part of the converted light is also reflected by the
• the carrier or holder 4 reflects and leaves the converter in the illumination direction.
• the carrier or holder 4 may be formed as a wedge-shaped plate which is rotatable about a rotation axis 40. Upon rotation of the converter 2 about this axis of rotation 40, the angle of incidence of the application light 1 changes. In this way, a fine adjustment of the angle of incidence with respect.
• the surface of the converter is possible. This can also be done later if the excitation light source is not available with a uniform excitation wavelength.
• the proportion of the reflected blue light 5 is determined by the laws of reflection when passing light from a thinner into a more optically denser medium.
• the converter material used was a Ce-YAG ceramic with a refractive index of 1.833.
• the reflected fraction was selected to be 0.2. This gives an angle of incidence of 68.3 °. A deviation in the angle of incidence of +/- one degree only leads to a change of +/- 1% in

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• Physics & Mathematics (AREA)
• Engineering & Computer Science (AREA)
• Optics & Photonics (AREA)
• Chemical & Material Sciences (AREA)
• General Engineering & Computer Science (AREA)
• Spectroscopy & Molecular Physics (AREA)
• General Physics & Mathematics (AREA)
• Microelectronics & Electronic Packaging (AREA)
• Inorganic Chemistry (AREA)
• Materials Engineering (AREA)
• Organic Chemistry (AREA)
• Optical Filters (AREA)
• Semiconductor Lasers (AREA)
• Projection Apparatus (AREA)
• Optical Elements Other Than Lenses (AREA)

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Citations (11)

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• 2012
  • 2012-03-22 DE DE102012005658A patent/DE102012005658B4/de active Active
• 2013
  • 2013-03-08 WO PCT/EP2013/054708 patent/WO2013139620A1/de not_active Ceased
  • 2013-03-08 JP JP2015500830A patent/JP2015511068A/ja active Pending
  • 2013-03-08 CN CN201380015381.4A patent/CN104204135B/zh active Active
• 2014
  • 2014-09-22 US US14/492,125 patent/US9599313B2/en active Active

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