WO2013118037A1 - A lighting assembly, a color conversion element, a lamp and a luminaire - Google Patents

A lighting assembly, a color conversion element, a lamp and a luminaire Download PDF

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Publication number
WO2013118037A1
WO2013118037A1 PCT/IB2013/050854 IB2013050854W WO2013118037A1 WO 2013118037 A1 WO2013118037 A1 WO 2013118037A1 IB 2013050854 W IB2013050854 W IB 2013050854W WO 2013118037 A1 WO2013118037 A1 WO 2013118037A1
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WO
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Patent type
Prior art keywords
light
color
color conversion
distribution
portion
Prior art date
Application number
PCT/IB2013/050854
Other languages
French (fr)
Inventor
Ties Van Bommel
Rifat Ata Mustafa Hikmet
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Koninklijke Philips N.V.
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V9/00Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
    • F21V9/30Elements containing photoluminescent material distinct from or spaced from the light source
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21KNON-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
    • F21K9/00Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/60Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
    • F21K9/64Optical 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00Reflectors for light sources
    • F21V7/22Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21KNON-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
    • F21K9/00Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/20Light sources comprising attachment means
    • F21K9/23Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21KNON-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
    • F21K9/00Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/20Light sources comprising attachment means
    • F21K9/23Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings
    • F21K9/232Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21KNON-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
    • F21K9/00Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/20Light sources comprising attachment means
    • F21K9/27Retrofit light sources for lighting devices with two fittings for each light source, e.g. for substitution of fluorescent tubes
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S6/00Lighting devices intended to be free-standing
    • F21S6/002Table lamps, e.g. for ambient lighting
    • F21S6/003Table lamps, e.g. for ambient lighting for task lighting, e.g. for reading or desk work, e.g. angle poise lamps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21YINDEXING 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
    • F21Y2103/00Elongate light sources, e.g. fluorescent tubes
    • F21Y2103/10Elongate light sources, e.g. fluorescent tubes comprising a linear array of point-like light-generating elements
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21YINDEXING 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
    • F21Y2115/00Light-generating elements of semiconductor light sources
    • F21Y2115/10Light-emitting diodes [LED]

Abstract

A lighting assembly (100), a color conversion element (109), a lamp and a luminaire are provided. The lighting assembly (100) comprises a light source (112) and a color conversion element (109). The light source (112) emits an angular light intensity distribution of a first color distribution. The angular light intensity distribution comprises a high intensity portion (116) with a relatively high intensity of light (102) of the first color distribution and comprises low intensity portion (110) with a relatively low intensity of light (102) of the first color distribution. The color conversion element (109) converts the light (102) of the first color distribution to another color distribution. The color conversion element (109) comprises a color conversion layer (108) and an optical element (114). The color conversion layer (108) is arranged to receive light from the light source (112) and comprises an organic luminescent material which is configured to absorb a portion of the light (102) of the first color distribution and to convert a portion of the absorbed light into light (104) of a second color distribution. The optical element (114) is arranged to prevent the exposure of the organic luminescent material to the high intensity portion (116) of the light (102) of the first color distribution by reducing the light intensity of the light (102) of the first color of the high intensity portion. The optical element (114) is further arranged to allow at least a part of the light (102) of the first color of the low intensity portion (110) to arrive at the color conversion layer (109) without being reduced in intensity.

Description

A LIGHTING ASSEMBLY, A COLOR CONVERSION ELEMENT, A LAMP AND A LUMINAIRE

FIELD OF THE INVENTION

The invention relates to the field of lighting assemblies which comprises an organic luminescent material for converting light from a first color to another color. BACKGROUND OF THE INVENTION

Published patent US7635203 discloses a lighting apparatus in which a light engine emits UV light towards a phosphor portion which is spaced from the lighting engine. The phosphor portion may, in a specific embodiment, comprise an organic phosphor which converts the UV light towards light of another color. The light engine comprises, in a specific embodiment, Light Emitting Diodes (LED). Organic luminescent material is relatively cheap and, consequently, provides a cost advantage.

Organic phosphors suffer from a relatively low photo-chemical stability. Their stability strongly depends on the temperature of the material and on the amount of light that it converts. If the material converts a relatively large amount of light, the material deteriorates relatively fast. Furthermore, if a relatively large amount of light is converted to another color, the organic phosphor material becomes relatively hot because energy is absorbed as the result of the Stokes Shift, and, thus, the organic phosphor material becomes damaged even sooner. Thus, after a relatively short period of time, the phosphor portion does not comply anymore with its conversion specifications. Consequently, the life time of the lighting apparatus of the cited patent is too short.

SUMMARY OF THE INVENTION

It is an object of the invention to provide a lighting assembly which has a relatively long life-time while it remains relatively cheap.

A first aspect of the invention provides a lighting assembly. A second aspect of the invention provides a color conversion element. A third aspect of the invention provides a lamp. A fourth aspect of the invention provides a luminaire. Advantageous embodiments are defined in the dependent claims. A lighting assembly in accordance with the first aspect of the invention comprises a light source and a color conversion element. The light source emits an angular light intensity distribution of a first color distribution. The angular light intensity distribution comprises a high intensity portion with a relatively high intensity of light of the first color distribution and comprises a low intensity portion with a relatively low intensity of light of the first color distribution. The color conversion element converts the light of the first color distribution to another color distribution. The color conversion element comprises a color conversion layer and an optical element. The color conversion layer is arranged to receive light from the light source and comprising an organic luminescent material which is configured to absorb a portion of the light of the first color distribution and to convert a portion of the absorbed light into light of a second color distribution. The optical element is arranged to prevent the exposure of the organic luminescent material to the high intensity portion of the light of the first color distribution by reducing the light intensity of the light of the first color of the high intensity portion. The optical element is further arranged to allow at least a part of the light of the first color of the low intensity portion to arrive at the color conversion layer without being reduced in intensity.

Without optical element, the color conversion layer would receive at some subareas a relatively high amount of light of the first color distribution. The organic luminescent material is sensitive to the first color distributions and, thus, without optical element, the organic luminescent material would have a short life-time. The optical element is configured to and is arranged such that the organic luminescent material does not anymore receive the relatively high intensity of the light of the first color distribution. Thus, the intensity of the first color distribution is reduced and as a result local increase of the temperature is reduced which as a result slows down the deterioration of the organic luminescent material. Thus, the optical element protects the organic luminescent material. The light of the first color distribution which is emitted in certain directions at a lower intensity is not reduced in intensity by the optical element, and, thus, the organic luminescent material, which receives this light, does not become too hot and/or does not receive too much light (does not receive a high dose) and maintains a relatively large life-time. The lighting assembly is relatively cheap because of the use of relatively cheap organic luminescent material. Furthermore, organic luminescent materials allow an easy design of a specific organic luminescent material which has a light emission spectrum anywhere in the visible light range. The optical element reduces the high intensity portion of the angular light intensity distribution of the light of the first color distribution. This means that less light of the first color distribution is emitted towards the color conversion layer when following the direction of the high intensity portion. This effect can be obtained by converting light of the first color distribution to light of another color distribution to which the organic luminescent material is not very sensitive. This effect can also be obtained by absorbing or reflecting a portion of the light of the first color distribution.

The total light emission by the lighting system is a combination of the first color distribution and of the second color distribution if not all light of the first color distribution is converted to the second color distribution. Thus, by combining, for example, a first color distribution which mainly has wavelengths in the blue spectral range with a second color distribution which mainly has wavelengths in the orange / yellow spectral range, substantially white light may be emitted by the lighting assembly.

Optionally, the optical element comprises inorganic luminescent material. The inorganic luminescent material is configured to absorb a portion of the light of the first color distribution of the high intensity portion and is configured to convert a portion of the absorbed light into light of a third color distribution. Thus, the optical element reduces the amount of light of the first color distribution of the high intensity portion by converting the light of the first color distribution to light of another color (third color distribution). It is to be noted that the third color distribution differs from the first color distribution to prevent that the organic luminescent material of the color conversion layer still absorbs a large amount of light and coverts it to another color. Optionally, the third color distribution is substantially equal to the second color distribution emitted by the organic luminescent material such that no color differences are seen by the human naked eye. Optionally, the third color distribution is substantially different from the second color distribution such that different colors are emitted by different areas of the color conversion element. The lighting system may be provided with a light mixing box arranged to receive the light emitted by the color conversion element such that a substantially homogeneous light emission is obtained by the lighting assembly as a whole.

The inorganic material prevents that the organic material is deteriorated too fast in the area where the color conversion layer receives the high intensity portion of the light emitted by the light source. The inorganic material also contributes in obtaining a specific light emission by the lighting assembly which may be a combination of the first color distribution, the second color distribution and the third color distribution. Thus, there are more design parameters to obtain a specific light emission which has a certain color point in a color space, and the Color Rendering Index of the light emitted by the lighting system is higher because light is emitted at more different wavelengths.

In known lighting systems, often only inorganic luminescent materials are used to obtain a relatively long life-time. An advantage, compared to the use of only inorganic luminescent materials, the solution of this optional embodiment results in a significant cost reduction: a limited amount of relatively expensive inorganic luminescent materials need to be applied in the optical element and a relatively large amount of relatively cheap organic luminescent material can be used in the color conversion layer.

Optionally, the optical element comprises light reflecting material for at least partially back reflecting light of the high intensity portions of the light distribution. The optical element of this optional embodiment reduces the amount of light of the first color distribution by back reflecting a significant portion of the light of the first color distribution. Back reflecting means that light is reflected in a direction that is about the reverse direction from which the light originates. In the optional embodiment, back-reflecting may be interpreted as "being reflected in a direction away from the color conversion layer". It is to be noted that the optical element may fully back reflect light or may partially allow the transmission of light of the first color distribution through the optical element. This is a very effective way of reducing the intensity of the high intensity portion. Optionally, to prevent a drop in efficiency of the color conversion element, the lighting assembly comprises a light reflective cavity in which the light source and the color conversion element are provided. The light reflective cavity receives the back-reflected light and specularly or diffusely reflects the light such that the back-reflected light is recycled and transmitted, after one or two reflections, to the light conversion element.

Optionally, the optical element is an integral part of the color conversion layer and is an area of the color conversion layer in which organic luminescent material is absent. Thus, in other words, the color conversion layer comprises different zones. In a first zone the light of the high intensity portion is received and this first zone is the optical element which prevents that organic luminescent material is lighted by the high intensity of light of the first color distribution. In a second zone, the color conversion layer comprises the organic luminescent material and the low intensity portion of the light emitted by the light source is received in this second zone. The advantage of one part comprising the optical element and the color conversion layer is that the complexity of the lighting assembly reduces because a fewer number of components have to be assembled. Optionally, the color conversion element comprises an optical element supporting means for arranging the optical element in between the light source and the color conversion layer within the light of the high intensity portion. Thus, in contrast to the previous optional embodiment, the optical element is not an integral part of the color conversion layer, and is a separate component which is hold in place by the optical element supporting means. The function of the optical element supporting means is to place the optical element in the high intensity portion of the light emitted by light source such that it can effectively reduce the intensity of the light of the high intensity portion before this light arrives at the color conversion layer. The optical element is, for example, arranged in between the light source and the color conversion layer. At least a gap is present between the light source and the optical element, which means that the optical element is not in direct contact with the light source.

Optionally, the optical element is a layer.

Optionally, the optical element is in contact with the color conversion layer. When the optical element is in contact with the color conversion layer it well defines in which area of the color conversion layer the received intensity of light is reduced.

Furthermore, the color conversion layer may support the optical element such that an optional optical element supporting means is not necessary anymore.

Optionally, the optical element comprises a further inorganic material which is configured to absorb a portion of the light of the first color distribution and/or light of the third color distribution and to convert a portion of the absorbed light into light of a fourth color distribution. The function of the further inorganic luminescent material is about the same as the function of the inorganic luminescent material of the optical element: reduce the amount of light of the first color distribution in the high intensity portion of the light emitted by the light source. A further function is to add light of the fourth color distribution to the total light emission of the lighting assembly such that more colors of light can be created and/or such that the Color Rendering Index (CRI) of the light emitted by the lighting assembly increases. The inorganic luminescent material and the further inorganic

luminescent material may be arranged in a mixture in the optical element. In another optional embodiment, the optical element comprises a plurality of layers and the inorganic

luminescent material and the further inorganic luminescent material are arranged in different layers. Optionally, the color conversion layer comprises a further organic luminescent material which is configured to absorb a portion of the light of the first color distribution and to convert a portion of the absorbed light to light of a fifth color distribution.

Optionally, a gap is present between the light source and the color conversion element. Thus, according to this optional embodiment, the color conversion element is not arranged on top of the light source. The color conversion layer is arranged in a remote configuration or a vicinity configuration, which means that the distance between the light source and the color conversion layer is, respectively, relatively large or relatively small.

Optionally, the lighting assembly comprises a light mixing cavity for mixing back-reflected light and reflecting the back-reflected light towards the color conversion element, wherein the light source is arranged in the light mixing cavity. Thus, the light mixing cavity provides means to recycle back reflected light in order to maximize the efficiency of the lighting assembly. The walls of the light mixing cavity which face the cavity are at least partially reflective and, in an embodiment, diffusely reflective. In an embodiment, the color conversion layer is arranged at a light exit window of the light mixing cavity.

Optionally, the lighting assembly further comprises a light mixing box for receiving light emitted by the color conversion element and for mixing the received light before being emitted into the ambient of the lighting assembly. Thus, the light output of the light mixing box has a substantial homogeneous color after being mixed by the light mixing box. The walls of the light mixing box which face the interior of the bix are at least partially reflective and, in an embodiment, diffusely reflective. The light mixing box has a light input window and in an embodiment the color conversion layer is arranged at this light input window.

According to a second aspect of the invention, a color conversion element for use in a lighting assembly according to the first aspect of the invention is provided. The color conversion element is configured to receive an angular light intensity distribution of a first color distribution from a light source, the angular light intensity distribution comprises high intensity portions with a relatively high intensity of light of the first color distribution and comprises low intensity portion with a relatively low intensity of light of the first color distribution. The color conversion element comprises a color conversion layer and an optical element. The color conversion layer is arranged to receive light from the light source and comprises an organic luminescent material being configured to absorb a portion of the light of the first color distribution and to convert a portion of the absorbed light into light of a second color distribution. The optical element is arranged to prevent the exposure of the organic luminescent material to the high intensity portion of the light of the first color distribution by reducing the light intensity of the light of the first color of the high intensity portion and the optical element is arranged to allow at least a part of the light of the first color of the low intensity portion to be transmitted to the color conversion layer without being reduced in intensity.

According to a third aspect of the invention, a lamp is provided which comprises a lighting assembly according to the first aspect of the invention.

According to a fourth aspect of the invention, a luminaire is provided which comprises a lighting assembly according to the first aspect of the invention or which comprises a lamp according to the third aspect of the invention.

The color conversion element, the lamp and the luminaire according to, respectively, the second aspect, the third aspect and the fourth aspect of the invention provide the same benefits as the lighting assembly according to the first aspect of the invention and has similar embodiments with similar effects as the corresponding embodiments of the lighting assembly.

These and other aspects of the invention are apparent from and will be elucidated with reference to the embodiments described hereinafter.

It will be appreciated by those skilled in the art that two or more of the above- mentioned options, implementations, and/or aspects of the invention may be combined in any way deemed useful.

Modifications and variations of the system, the color conversion element, the lamp or the luminaire which correspond to the described modifications and variations of the lighting assembly, can be carried out by a person skilled in the art on the basis of the present description.

BRIEF DESCRIPTION OF THE DRAWINGS

In the drawings:

Fig. la schematically shows a cross-section of an embodiment of a lighting assembly according to the first aspect of the invention,

Fig. lb schematically shows a cross-section of another embodiment of a lighting assembly,

Fig. 2a schematically shows a cross-section of an embodiment of a lighting assembly, Fig. 2b schematically shows a cross-section of another embodiment of a lighting assembly,

Fig. 3 schematically shows a cross-section of a further embodiment of a lighting assembly,

Fig. 4 schematically shows a plurality of configurations of the color conversion element of the lighting assembly,

Fig 5a schematically shows a cross-section of a lighting assembly which comprises a plurality of light sources,

Fig. 5b schematically shows a cross-section of a lighting assembly which comprises a reflective cavity and a light mixing box,

Fig. 6a schematically shows a light tube comprising a plurality of lighting assemblies according to the first aspect of the invention,

Fig. 6b schematically shows a retrofit light bulb comprising a lighting assembly according to the first aspect of the invention, and

Fig. 7 schematically shows a luminaire comprising a lighting assembly according to the first aspect of the invention.

It should be noted that items denoted by the same reference numerals in different Figures have the same structural features and the same functions, or are the same signals. Where the function and/or structure of such an item have been explained, there is no necessity for repeated explanation thereof in the detailed description.

The Figures are purely diagrammatic and not drawn to scale. Particularly for clarity, some dimensions are exaggerated strongly.

DETAILED DESCRIPTION

A first embodiment is shown in Fig. 1. Fig. 1 shows a lighting assembly 100 which comprises a light source 112 and a color conversion element 109.

The light source 112 emits light 102 of a first color distribution. The light is emitted in an angular light intensity distribution which comprises a low intensity portion 110 and a high intensity portion 116. Often such an angular light intensity distribution has high intensities of light at relatively low angles a with respect to a central axis 118 of the angular light intensity distribution. The high intensity of light forms the high intensity portion 116.

Further, such an angular light intensity distribution has low intensities of light at relatively high angles a with respect to the central axis 118 of the angular light intensity distribution.

The low intensity of light forms the low intensity portion 110. It is to be noted that the light emission of the light source 112 may also have a different angular light intensity distribution than the distribution shown in Fig. la. The high intensity portion is not necessarily arranged at relatively low angles a with respect to a central axis 118 and the low intensity portion 110 is not necessarily arranged at relatively high angles a with respect to a central axis 118. The most important characteristic of the light emission by the light source 112 is that the light emission comprises portions at which the emitted light intensities are significantly higher than at other portions of the light emission. In practice, the differences in light intensities at different angles follow a continuous curve and, thus, the border between the high intensity portion and the low intensity portion is formed by a light intensity threshold value.

The light 102 of the first color distribution is emitted towards the color conversion element 109 which receives the light 102 of the first color distribution. The color conversion element 109 is for converting at least a part of the light 102 of the first color distribution to another color distribution. The another color distribution may be a

combination of different color distribution emitted by the color conversion element 109 as the result of the conversion, or the another color distribution may be a single color distribution emitted by the color conversion element 109. The color conversion element 109 comprises a color conversion layer 108 which comprises an organic luminescent material. The organic luminescent material is configured to absorb a portion of the received light 102 of the first color distribution and to convert a portion of the absorbed light to light 104 of a second color distribution. Furthermore, the color conversion layer may partially allow the transmission of light 102 of the first color distribution through the color conversion layer 108.

The color conversion element 109 further comprises an optical element 114. The optical element 114 is arranged to prevent the exposure of the organic luminescent material of the color conversion layer 108 to the high intensity portion of the light 102 of the first color distribution. The optical element 114 reduces the light intensity of the light 102 of the first color distribution of the high intensity portion 116. The optical element 114 is further arranged to allow at least a part of the light 102 of the first color of the low intensity portion 110 to be transmitted to the color conversion layer without being reduced in intensity. Thus, in other words, the light 102 of the low intensity portion 110 is minimally disturbed by the optical element 114, while the light of the high intensity portion 116 is reduced in intensity such that the light 102 of the first color distribution of the high intensity portion 116, which may still arrive at the color conversion layer 108, has a significantly reduced light intensity. In Fig. la, the optical element 114 is a layer which is arranged within the high intensity portion 116 of the light 102 of the first color distribution which means that all light of the high intensity portion 116 impinges on the optical element 114. The optical element 114 comprises an inorganic luminescent material for absorbing a portion of the light 102 of the first color distribution and for converting a portion of the absorbed light to light 106 of a third color distribution. This means that the intensity of the light 102 of the first color distribution is reduced because it is at least partly converted towards light 106 of the third color distribution. The inorganic luminescent material may absorb all light 102 of the first color distribution in the high intensity portion 116 or a significant portion of the light 102 of the first color distribution in the high intensity portion 116. The result is that the color conversion layer 108 receives, when the light emission path of the high intensity distribution 116 is followed, a relatively low intensity of light 102 of the first color distribution and at least an amount of light 106 of the third color distribution. The organic luminescent material of the color conversion layer 108 absorbs light 102 of the first color distribution and not the light 106 of the third color distribution. Thus, if the high intensity of light 102 of the first color distribution is reduced by converting a significant portion of the light 102 of the first color distribution towards light 106 of the third color distribution, the organic material of the color conversion layer 108 does not receive the high intensity of light 102 of the first color distribution.

Organic luminescent materials are sensitive for relatively high intensities of light to which they are sensitive (which means: which they absorb). They degrade relatively fast if they have to convert a high amount of light. Further, during the conversion heat is generated by the organic luminescent materials, which further degrades the organic luminescent materials. Thus, in the lighting assembly 100 of Fig. la the optical element 114 is an effective measure to reduce the high intensity of light 102 of the first color distribution before this light impinges on the organic luminescent material. This extends the life-time of the organic luminescent material of the color conversion layer 108, and, thus, extends the life-time of the lighting assembly as a whole.

As indicated in Fig. la, the total light emission of the lighting assembly 100 comprises light 102 of the first color distribution, light of the second color distribution 104 and light 106 of the third color distribution. A mix of these three color distribution is emitted and as such a specific color of light is emitted by the lighting assembly 100. By tuning the first color distribution, the second color distribution, the third color distributions, and the amount of light 102 of the first color distribution which is converted to light 104 of the second color distribution and/or which is converted to light 106 of the third color distribution, a specific light emission can be obtained having a specific color point in a color space. It is to be noted that in a specific embodiment, the organic luminescent material absorbs all light 102 of the first color distribution and/or the inorganic luminescent material absorbs all light 102 of the first color distribution. In such a case, the light emission by the lighting assembly 100 only comprises light 104 of the second color distribution and light 106 of the third color distribution. This may be the case when the light source 112 emits UV light which must be fully converted to light in the spectral range which is visible to humans.

The optical element 114 may also comprise a further inorganic luminescent material which also absorbs light 102 of the first color distribution and converts it to light of a fourth color distribution. The presence of the further inorganic luminescent material further reduces the intensity of the light 102 of the first color distribution and generates an additional color which may be advantageous with respect to the color of the light emitted by the light conversion element as a whole (e.g. the possibility to generate more colors and increasing the Color Rendering Index (CRI)). The inorganic luminescent material and the further inorganic luminescent material may be arranged as a mix in the optical element 114. The color conversion layer 108 may comprises a further organic luminescent material which absorbs a portion of the light of the first color distribution and converts it to light of another color. The organic luminescent material and the further organic luminescent material may be applied in a mix in the color conversion element 108.

The light source 112 may be a solid state light emitter, such as a Light

Emitting Diode (LED), an organic LED, or in another embodiment a laser. However, embodiments of the light source are not limited to solid state light emitters. In other embodiments the light source is an incandescent lamp or a traditional (fluorescent) light tube.

The light source 112 may emit, for example, blue light. The organic phosphor may be a material which comprises a perylene derivative, such as a yellow emitting perylene derivative, or a red/orange emitting perylene derivate. Such perylene derivatives are commercially available under the name Lumogen Yellow F083 or F170, Lumogen Red F305 and Lumogen Orange F240. The inorganic luminescent material may comprises a yellow emitting in organic phosphor, such as YAG and/or LuAG, or a red inorganic phosphor such as ECAS and/or BSSN. The color conversion layer 108 may be manufactured by arranging a layer with the organic luminescent material on a transparent layer of, for example, glass or polycarbonate. The organic luminescent material may also be arranged in a matrix polymer, such as Polymethyl methacrylate (PMMA), Polyethylene terephthalate (PET), Polyethylene naphthalate (PEN) or polycarbonate (PC) of which a solid layer is manufactured.

Fig. lb schematically shows a cross-section of another embodiment of a lighting assembly 150. Lighting assembly 150 is similar to lighting assembly 100, however, the color conversion element 159 has a different structure. The color conversion element 159 comprises the color conversion layer 108 which is similar to the color conversion layer 108 of Fig. la. Thus, the color conversion layer 108 comprises organic luminescent material which is configured to absorb a portion of the light 102 of the first color distribution and to convert a portion of the absorbed light towards light 104 of the second color distribution. The color conversion element 159 further comprises an optical element 164 which partially back refiects light 102 of the first color distribution. The back reflected light 152 is transmitted into a direction away from the color conversion element 159. The optical element 164 comprises a material which is at least partially reflective and, as such, if the high intensity portion 116 impinges on the optical element, a significant part of the light of the high intensity portion 116 is reflected back and not transmitted towards the organic material of the color conversion layer. In Fig. lb, the partially back reflecting optical element 164 is a layer which is in contact with the color conversion layer 108.

In an embodiment, the optical element 164 is a specular reflective layer, for example, made of a reflective metal. In another embodiment, the optical element 164 comprises diffusely reflective particles, such as Ti02 or A1203 particles. In a further embodiment, the optical element 164 may comprise a dichroic filter which back reflects light 102 of the first color distribution and allows the transmission of light of other wavelengths.

Fig. 2a schematically shows a cross-section of an embodiment of a lighting assembly 200. The lighting assembly 200 is similar to the lighting assembly 100 of Fig. la. However, the color conversion element 208 of the lighting assembly 200 is different and the light source 212 is schematically drawn as a traditional incandescent lamp.

The color conversion element 208 is a single layer which comprises a first subarea 218 and a second subarea 214. The first subarea comprises organic luminescent material and the second subarea comprises inorganic luminescent material. The first subarea 218 only receives light of the low intensity portion 110 of the light emitted by the light source 212. The second subarea 214 receives all light of the high intensity portion 116 of the light emitted by the light source 212. In other words, the optical element and the color conversion layer of the color conversion element 208 are a single integral part which is formed as a single layer. The organic luminescent material and the inorganic luminescent material are configured in the same way and have the same function as the organic and inorganic luminescent material of the color conversion element 109 of Fig. la. Such a color conversion element 208 may be manufactured by starting from a transparent substrate on which, in the first subarea 218, a layer with the organic luminescent material is applied an on which, in the second subarea 214, a layer with the inorganic luminescent material is applied. Another way of manufacturing the color conversion element 208 is by starting with a layer which comprises the organic luminescent material, sawing a hole in the layer which is filled by a piece of another layer which comprises the inorganic luminescent material.

Fig. 2b schematically shows a cross-section of another embodiment of a lighting assembly 250. The lighting assembly 250 is similar to the lighting assembly 150 of Fig. lb. However, the color conversion element 258 of the lighting assembly 250 is different and the light source 212 is schematically drawn as a traditional incandescent lamp.

The color conversion element 258 is a single layer which comprises a first subarea 218 and a second subarea 264. The first subarea 218 comprises organic luminescent material and the second subarea 264 comprises a partially reflective material for partially back reflecting light of the high intensity portion 116 of the light emission of the light source 212. In other words, the partially back reflecting optical element and the color conversion layer of the color conversion element 258 form an integral part which is formed as a single layer. Such a color conversion layer 250 may be manufactured by applying to a transparent substrate in the first subarea 218 a layer which comprises the organic luminescent material and applying in the second subarea 264 a layer which comprises partially reflective particles.

The effect of the lighting assembly 200 and lighting assembly 250 is similar to the effects of lighting assembly 100 and lighting assembly 150. The life-time of the organic luminescent material, and, thus, the life-time of the lighting assemblies is increased. Further, the lighting assembly 200, 250 have a less complex configuration because only a single layer is present in the color conversion elements 208, 258.

Fig. 3 schematically shows a cross-section of a further embodiment of a lighting assembly 300. The lighting assembly 300 is similar to the lighting assembly 150 of Fig. lb. However, the partially back reflective optical element 164 is not arranged in direct contact with the color conversion layer 108, but is arranged at a distance away from the color conversion layer 108. The lighting assembly 300 further comprises a support frame 318 which supports the partially back reflective optical element 164 such that the optical element 164 is arranged within the high intensity portion 116 of the light emitted by the light emitter 112. All light of the high intensity portion 116 impinges on the optical element 164 and a significant part of this portion is reflected back in a direction away from the color conversion layer 108. Thus, the light emission from the optical element 164 towards the color conversion layer 108 comprises a low intensity of light of the first color distribution, and, thus, the lifetime of the organic luminescent material of the color conversion layer 108 is extended. In Fig. 3 the support frame 318 also supports the light emitter 112 such that the light emitter 112, the optical element 164 and the color conversion layer 108 are arranged at predefined distances from each other. The support frame 318 comprises, for example, of thin metal bars which only obstruct the light emission of the light source 112 to a limited extent.

It is to be noted that, according to the invention, the optical element 164 is not arranged directly on top of the light source 112.

Alternatively, instead of the back reflective optical element 164 which is arranged at a predefined distance from the color conversion layer 108, the optical element 114 of Fig. la may be arranged at the predefined distance from the color conversion layer 108 by the supporting frame 318. In other words, the supporting frame 318 is arranged to support the optical element 114 comprising inorganic luminescent material or the partially back reflective optical element 164 at a distance away from the color conversion layer 108 within the high intensity portion 164 of the light emission of the light source 112.

Fig. 4 schematically shows a plurality of configurations of the color conversion element 400, 410, 420, 430, 440, 450, 460 of the lighting assembly according to previous embodiments of the invention.

In part (a) of Fig. 4, a color conversion element 400 has the color conversion layer 108 of Fig. la which comprises the organic luminescent material. The optical element of the color conversion element 400 comprises two layer 114, 402. A first layer 114 is equal to the optical element 114 of Fig. la and comprises an inorganic luminescent material. The first layer 1 14 is arranged in contact with the color conversion layer 108. A second layer 402 is arranged to the first layer 114 such that the first layer 114 is between the second layer 402 and the color conversion layer 108. The second layer 402 comprises a further inorganic luminescent material which is configured to absorb a portion of the light of the first color distribution and to convert a portion of the absorbed light towards light of a fourth color distribution.

In part (b) of Fig. 4, a color conversion element 410 comprises the color conversion 218 of Fig. 2a and an additional second layer 402 as discussed above in relation to color conversion element 400. In part (c) of Fig. 4, a color conversion element 420 comprises a first subarea 428 comprising an organic luminescent material, a second subarea 424 comprising a first inorganic luminescent material and a third subarea 422 comprises a second inorganic luminescent material. The second subarea 424 and the third subarea 422 form the optical element for preventing the transmission of high intensity light of the first color distribution towards organic luminescent material. Alternatively to two subareas with different inorganic luminescent materials, the inorganic luminescent materials may be mixed in a single subarea, or a single subarea may contain a gradient from 100% of the first inorganic luminescent material to 100% of the second inorganic luminescent material.

In part (d) of Fig. 4, a color conversion element 430 comprises the color conversion layer 108 of Fig. la. The optical element of the color conversion element 430 is formed by a layer which comprises a first subarea 434 and a second subarea 432. The first subarea 434 comprising a first inorganic luminescent material and a second subarea 442 comprises a second inorganic luminescent material. The optical element is arranged in contact with the color conversion layer 108.

In part (e) of Fig. 4, a color conversion element 440 is presented which comprises a color conversion layer which exists of two layers 448, 108 each with a separate organic luminescent material. The optical element 114 is similar to optical element 114 of Fig. la. The first color conversion layer 108 comprises a first organic luminescent material for absorbing a portion of light of the first color distribution and converting the absorbed portion to light of the second color distribution. The second color conversion layer 108 comprises a second organic luminescent material for absorbing a portion of light of the first color distribution and/or light of the second color distribution and for converting the absorbed portion to light of a fifth color distribution. The first organic luminescent material and the second organic luminescent material are subject to photo and thermal degradation if too much light of the first color distribution is converted by the materials towards light of another color. The optical element 114 protects both layers for the high intensity of light of the first color distribution. Alternatively, instead of two layers 108, 448 with an organic luminescent material, the two organic luminescent material may also be arranged in a mixture in a single layer.

In part (f) of Fig. 4, a color conversion element 450 is presented which is not a flat layer, but has a dome shape. The color conversion element 450 receives an angular light emission distribution from a light source which comprises a low intensity portion and a high intensity portion. The color conversion element 450 comprises a first subarea 456 which comprises an organic luminescent material and comprises a second subarea 452 which comprises an inorganic luminescent material. The second subarea 452 is the optical element which prevents the organic luminescent material for receiving the high intensity of light of the first color distribution, thus, the second subarea 452 has to be arranged in the high intensity portion of the angular light emission distribution that is received by the color conversion element 450. The first subarea 456 has to be arranged such that it receives light of the first color distribution of the low intensity portion of the angular light emission distribution.

In part (g) of Fig. 4, a color conversion element 460 is shown which comprises a color conversion layer 468, which is dome shaped, and comprises an optical element 114 similar to the optical element 114 of Fig. la. The optical element 114 is arranged with a supporting frame 464 at some distance away from the color conversion layer 468 in the high intensity portion of the angular light emission distribution of light of the first color distribution that is received by the color conversion element 460. The supporting frame 464 comprises of thin wires being connected to the color conversion element 460. The supporting frame 464 forms a suspension for the optical element 114.

Fig. 5a schematically shows a cross-section of a lighting assembly 500 which comprises a plurality of light sources 112. The plurality of light source 112 each emit light of the first color distribution towards the color conversion element 509. The light emission of each of the light sources 112 comprises a high intensity portion 116 and a low intensity portion 110. As such, the color conversion element 509 comprises a plurality of optical elements 114 which each reduce the intensity of light of the first color distribution of each one of the respective high intensity portions 116.

Fig. 5b schematically shows a cross-section of a lighting assembly 550 which comprises a reflective cavity 558 comprising the light source 112 and a light mixing box 554 with a light exit window 552. The basis of the lighting assembly 550 is formed by a housing 560 which has a light exit window 552. Within the housing, opposite the light exit window 552, is provided a light source 112 which emits light of a first color distribution towards the light exit window 552. The light emission of the light source 112 comprises a high intensity portion and a low intensity portion. Within the housing, in between the light source 112 and the light exit window 552 is provided a color conversion element 258 which comprises a subarea with organic luminescent material and a subarea with partially back reflective material. Color conversion element 258 is similar to color conversion element 258 of Fig. 2b. The color conversion element 258 divides the housing into two different areas. The area between the light source 112 and the color conversion element 258 is a reflective cavity 558 and the area between the color conversion element 258 and the light exit window 552 is the light mixing box 554.

The inner walls 556 of the housing 560 may be diffusely reflective as indicated at position 562. Light which is back reflected by the color conversion element 258 impinges on the inner walls and is diffusely reflected such that it is transmitted after one or two reflections towards the color conversion element 258 to recycle the back-reflected light instead of absorbing the light. The light emission of the color conversion element 258 in the direction of the light exit window 552 does not have a homogeneous color distribution. The light mixing box 556 with the diffusely reflective walls 556 mixes the light of the different light emission distributions to obtain a substantially homogenous light emission through the light exit window 552.

The inner walls 556 of the housing 560 may also be specularly reflective or partially reflective. Further, the color conversion element may be different from the color conversion element 258 of Fig. 5b. Any of the previously discussed color conversion elements may be used in the lighting assembly 550.

Fig. 6a schematically shows a light tube 600 comprising a plurality of lighting assemblies 602 according to the first aspect of the invention. The total light emission 604 of the light tube 600 is a combination of the light emissions of the plurality of lighting assemblies 602.

Fig. 6b schematically shows a retrofit light bulb 650 comprises a lighting assembly 652 according to the first aspect of the invention.

The retrofit light bulb 650 and the light tube 600 have the same advantages and effects as the lighting assemblies discussed in previous embodiments.

Fig. 7 schematically shows a luminaire 700 comprising a lighting assembly 702 according to the first aspect of the invention. The luminaire 700 is, for example, placed on a desk 704 and lightens area 706 of the desk 704. The luminaire 700 may also comprise a light tube or a retrofit light bulb according to Fig. 6a or Fig. 6b. The luminaire 700 has the same advantages and effects as the lighting assemblies discussed in previous embodiments.

It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. Use of the verb "comprise" and its conjugations does not exclude the presence of elements or steps other than those stated in a claim. The article "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the device claim enumerating several means, several of these means may be embodied by one and the same item of hardware. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.

Claims

CLAIMS:
1. A lighting assembly (100, 150, 200, 250, 300, 500, 550, 602, 652, 702) comprising
a light source (112, 212) for emitting an angular light intensity distribution of a first color distribution, the angular light intensity distribution comprises a high intensity portion (116) with a relatively high intensity of light (102) of the first color distribution and comprises a low intensity portion (110) with a relatively low intensity of light (102) of the first color distribution,
a color conversion element (109, 159, 208, 258, 400, 410, 420, 430, 440, 450, 460, 509) for converting at least a part of the light (102) of the first color distribution to another color distribution, the color conversion element (109, 159, 208, 258, 400, 410, 420, 430, 440, 450, 460, 509) comprising a color conversion layer (108, 208, 218, 258, 428, 256, 468) and an optical element (114, 164, 214, 264, 164, 402, 432, 434, 452), wherein
the color conversion layer (108, 208, 218, 258, 428, 256, 468) being arranged to receive light from the light source (112, 212) and comprising an organic luminescent material being configured to absorb a portion of the light (102) of the first color distribution and to convert a portion of the absorbed light into light (104) of a second color distribution, the optical element (114, 164, 214, 264, 164, 402, 432, 434, 452) being arranged for preventing the exposure of the organic luminescent material to the high intensity portion (116) of the light (102) of the first color distribution by reducing the light intensity of the light of the first color of the high intensity portion (116) and the optical element (114, 164, 214, 264, 164, 402, 432, 434, 452) being arranged to allow at least a part of the light (102) of the first color of the low intensity portion (110) to be transmitted to the color conversion layer (108, 208, 218, 258, 428, 256, 468) without being reduced in intensity.
2. A lighting assembly (100, 150, 200, 250, 300, 500, 550, 602, 652, 702) according to claim 1, wherein the optical element (114, 164, 214, 264, 164, 402, 432, 434, 452) comprises inorganic luminescent material being configured to absorbed a portion of the light (102) of the first color distribution of the high intensity portion (1 16) and to convert a portion of the absorbed light into light (106) of a third color distribution.
3. A lighting assembly according to claim 1, wherein the optical element (114, 164, 214, 264, 164, 402, 432, 434, 452) comprises light reflecting material for at least partially back reflecting light of the high intensity portion (116).
4. A lighting assembly according to claim 2 or 3, wherein the optical element
(114, 164, 214, 264, 164, 402, 432, 434, 452) is an integral part of the color conversion layer (108, 208, 218, 258, 428, 256, 468) and is an area of the color conversion layer in which organic luminescent material is absent.
5. A lighting assembly according to claim 2 or 3, wherein the color conversion element (109, 159, 208, 258, 400, 410, 420, 430, 440, 450, 460, 509) comprises an optical element supporting means (318, 464) for arranging the optical element (114, 164, 214, 264, 164, 402, 432, 434, 452) in between the light source (112, 212) and the color conversion layer (108, 208, 218, 258, 428, 256, 468) within the light of the high intensity portion (116).
6. A lighting assembly (100, 150, 200, 250, 300, 500, 550, 602, 652, 702) according to claim 2, 3 or 5, wherein the optical element (114, 164, 214, 264, 164, 402, 432, 434, 452) is a layer.
7. A lighting assembly (100, 150, 200, 250, 300, 500, 550, 602, 652, 702) according to claim 6, wherein the optical element (114, 164, 214, 264, 164, 402, 432, 434, 452) is in contact with the color conversion layer (108, 208, 218, 258, 428, 256, 468).
8. A lighting assembly (100, 150, 200, 250, 300, 500, 550, 602, 652, 702) according to claim 2, wherein the optical element (114, 164, 214, 264, 164, 402, 432, 434, 452) comprises a further inorganic material being configured to absorb a portion of the light (102) of the first color distribution and/or light (106) of the third color distribution and to convert a portion of the absorbed light into light of a fourth color distribution.
9. A lighting assembly according to claim 1, wherein a gap is present between the light source (112, 212) and the color conversion element (109, 159, 208, 258, 400, 410, 420, 430, 440, 450, 460, 509).
10. A lighting assembly (100, 150, 200, 250, 300, 500, 550, 602, 652, 702) according to claim 1 or 3, further comprising a light mixing cavity (558) for mixing back- reflected light and reflecting the back-reflected light towards the color conversion element (109, 159, 208, 258, 400, 410, 420, 430, 440, 450, 460, 509), wherein the light source (112, 212) is arranged in the light mixing cavity (558).
11. A lighting assembly (100, 150, 200, 250, 300, 500, 550, 602, 652, 702) according to claim 1, further comprising a light mixing box (554) for receiving light emitted by the color conversion element (109, 159, 208, 258, 400, 410, 420, 430, 440, 450, 460, 509) and for mixing the received light before being emitted into the ambient of the lighting assembly (100, 150, 200, 250, 300, 500, 550, 602, 652, 702).
12. A color conversion element (109, 159, 208, 258, 400, 410, 420, 430, 440, 450, 460, 509) for use in the lighting assembly (100, 150, 200, 250, 300, 500, 550, 602, 652, 702) according to any of the claims 1 to 11, the color conversion element (109, 159, 208, 258, 400, 410, 420, 430, 440, 450, 460, 509) being configured to receive an angular light intensity distribution of a first color distribution from a light source (112, 212), the angular light intensity distribution comprises a high intensity portion (116) with a relatively high intensity of light (102) of the first color distribution and comprises a low intensity portion (1 10) with a relatively low intensity of light (102) of the first color distribution, the color conversion element (109, 159, 208, 258, 400, 410, 420, 430, 440, 450, 460, 509) comprising
a color conversion layer (108, 208, 218, 258, 428, 256, 468) being arranged to receive light from the light source (112, 212) and comprising an organic luminescent material being configured to absorb a portion of the light (102) of the first color distribution and to convert a portion of the absorbed light into light (104) of a second color distribution,
an optical element (114, 164, 214, 264, 164, 402, 432, 434, 452) being arranged for preventing the exposure of the organic luminescent material to the high intensity portion (116) of the light (102) of the first color distribution by reducing the light intensity of the light (102) of the first color of the high intensity portion and the optical element (114, 164, 214, 264, 164, 402, 432, 434, 452) being arranged to allow at least a part of the light (102) of the first color of the low intensity portion (110) to be transmitted to the color conversion layer (108, 208, 218, 258, 428, 256, 468) without being reduced in intensity.
13. A lamp (600, 650) comprising a lighting assembly (100, 150, 200, 250, 300, 500, 550, 602, 652, 702) according to claim 1.
14. A luminaire (700) comprising a lighting assembly (100, 150, 200, 250, 300, 500, 550, 602, 652, 702) according to claim 1 or a lamp (600, 650) according to claim 13.
PCT/IB2013/050854 2012-02-10 2013-02-01 A lighting assembly, a color conversion element, a lamp and a luminaire WO2013118037A1 (en)

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