DE102019210255A1 - Illumination device for emitting light of several wavelengths, optical analysis device for illuminating and analyzing a sample and method for producing an illumination device - Google Patents

Abstract

The present invention provides a lighting device (1) for emitting light of several wavelengths, comprising a light source (10); a wavelength-converting device (2) which is arranged in an emission area of the light source (10) which has at least a first converter area (KB3a, KB3b, ..., KB3n) with a first wavelength-converting material (3a) and a second converter area (KB3a ' , KB3b ', ..., KB3n') with a second wavelength-converting material (3b), the first converter region (KB3a, KB3b, ..., KB3n) being set up to convert light from the light source (10) into a first To convert wavelength and the second converter area (KB3a ', KB3b', ..., KB3n ') is set up to convert light from the light source (10) into a second wavelength, the first and the second wavelength being different, and wherein the converter areas (KB3a, KB3b ', ..., KB3n) are arranged laterally next to one another.

Description

The present invention relates to a lighting device for emitting light of several wavelengths, an optical analysis device for illuminating and analyzing a sample, and a method for producing a lighting device.

State of the art

Light-converting phosphors are known from fluorescent tubes, for example. Owing to its sensitivity to the eyes, the fluorescent material usually only has a comparatively small bandwidth of 400 nm to about 700 nm. For use in sensor technology, significantly larger bandwidths may be necessary or desirable, for example outside the visible wavelength range, for example in the infrared . The development of luminescent substances mostly relates to the visible wavelength range and therefore far less suitable materials for infrared luminescent substances are known.

For the spectrometry, a PC-LED ("Phosphor Converted Light Emitting Diode") is currently used in the SCiO product from ConsumerPhysics, which emits fluorescent-converted infrared light outside the visible wavelength range of 700 nm to 1000 nm. The excitation light of the LED has a wavelength of around 450 nm and is converted by the phosphor with far lower efficiencies than is the case for corresponding products from lighting applications.

More broadband solutions and / or corresponding products in the longer-wave infrared range would be desirable. For spectrometry in particular, the light source should have a broad emitted wavelength range with as constant an intensity as possible. The properties of the available phosphors of the PC-LED (phosphor converted) influence the functional scope and the performance of an optical system (e.g. a spectrometer or a hyperspectral camera) considerably. Usually two different PC-LEDs with different wavelength ranges are used for the lighting. In order to cover a wider wavelength range (> 300 nm) with a single LED, several phosphors are usually required.

In the CN 105 895783 A it is proposed to stack several phosphors on top of one another and to excite them through all layers.

Disclosure of the invention

The present invention provides a lighting device for emitting light of several wavelengths according to claim 1, an optical analysis device for illuminating and analyzing a sample according to claim 13 and a method for producing a lighting device according to claim 15.

Preferred further developments are the subject of the subclaims.

Advantages of the invention

The idea on which the present invention is based consists in specifying a lighting device for emitting light of several wavelengths, an optical analysis device for illuminating and analyzing a sample and a method for producing an optical lighting device, with a compact and broadband light source for an analysis device, such as a spectrometer or an imaging hyperspectral sensor for irradiating a sample can be implemented. The lighting device can emit in the visible wavelength range and also in the UV or infrared wavelength range for use in spectroscopy. By means of the lighting device, the emission properties of several individual wavelength-converting materials can be adapted independently of one another to requirements and their mutual influence can be reduced. For example, the intensity, the emission, the bandwidth of the lighting device, or the rise and decay times can be adapted and, in the process, drops in emission efficiency compared to a mixture of wavelength-converting materials can be reduced or avoided.

According to the invention, the lighting device for emitting light of several wavelengths comprises a light source; a wavelength-converting device, which is arranged in an emission region of the light source, which comprises at least a first converter region with a first wavelength-converting material and a second converter region with a second wavelength-converting material, the first converter region being configured to convert light from the light source into a first wavelength to convert and the second converter area is set up to convert light from the light source into a second wavelength, wherein the first and the second wavelength are different, and wherein the converter areas are arranged laterally next to one another.

By separating the phosphors, a higher emission intensity can be achieved than with a mixture of phosphors. In this way, a lighting device can be provided which emits with as constant an intensity as possible over a broad wavelength range.

According to a preferred embodiment of the lighting device, the light from the light source can be converted into a first wavelength range by the first converter area and into a second wavelength range by the second converter area, the first wavelength range and the second wavelength range partially overlapping.

By using several wavelength-converting materials, an intensity profile of the emitted wavelengths in the emission spectrum can be increased or broadened; in particular, the spectral intensity profile, that is to say over the wavelengths, can have a smoother profile than a single phosphor.

According to a preferred embodiment of the lighting device, the light source comprises a laser or an LED.

A laser or an LED can provide light with a precisely defined emission intensity and can easily be installed in a lighting device.

According to a preferred embodiment of the lighting device, the wavelength-converting device with the converter areas is each arranged directly on the light source.

A lighting device that is compact in size can advantageously be provided by a direct arrangement. The converter areas can be first and / or second converter areas.

Instead of being directly on the light source, the wavelength-converting device with the converter regions can be adjacent or adjacent to the light source by a certain distance.

According to a preferred embodiment of the lighting device, it comprises a cavity in which the light source is arranged and the converter regions at least partially fill the cavity.

The cavity can generate a reflective effect on its side walls and radiation emerging from the converter areas can be reflected back into the converter areas at the side areas, which can lead to an increase in the efficiency of the converter areas. The converter areas can be first and / or second converter areas.

According to a preferred embodiment of the lighting device, the wavelength-converting device comprises a carrier on which the converter areas are arranged and the carrier is arranged at a distance from the light source in an emission direction of the light from the light source.

By arranging them on a carrier, greater freedom for placing or orienting the phosphors can be achieved. The converter areas can be decoupled from a thermal effect of the light source by spacing them apart. The converter areas can be first and / or second converter areas.

According to a preferred embodiment of the lighting device, it comprises a cavity in which the light source is arranged and the carrier at least partially covers the cavity.

The arrangement on a carrier allows simple placement of the phosphors over the cavity, which can have a reflective effect in one direction of emission. By covering the cavity, a combination of phosphors can advantageously easily be arranged over this cavity, at least partially spanning it.

According to a preferred embodiment of the lighting device, the converter areas are integrated in the carrier or arranged on the carrier on a side facing away from or facing the light source and have an optically effective shape.

With an optically effective shape, lens effects can be achieved, for example, in order to be able to better influence the emission of the converted radiation, for example to focus on an area in the emission direction. The converter areas can be first and / or second converter areas.

According to a preferred embodiment of the lighting device, the light from the light source can be converted into an infrared or near-infrared range by means of at least one of the first and / or second and / or several wavelength-converting materials.

For use in sensor technology, relatively large bandwidths may be necessary or desirable, for example outside the visible wavelength range, for example in the infrared.

According to a preferred embodiment of the lighting device, it comprises a plurality of at least first and second converter areas, and the ratio of the intensity of light of at least the first wavelength to the intensity of light of the second wavelength can be set with a ratio of first converter areas to second converter areas.

By influencing the ratio of the converter areas, a certain bandwidth of the radiation can be achieved with a focus on the intensity in the desired wavelength.

According to a preferred embodiment of the lighting device, an intensity of a light emitted by the respective converter area can be set through a thickness of this converter area and the converter areas have the same or different thicknesses.

The converter areas can be first and / or second converter areas.

By means of a thickness that can be selected during manufacture, it is advantageously possible to easily influence the emission characteristic, advantageously on the emitted converted intensity.

According to a preferred embodiment of the lighting device, the carrier comprises a diffuser.

A diffuser can be used to achieve spatial homogenization of the radiation, and greater mixing of the different spectral components of the light emitted by the lighting device can be achieved.

According to the invention, the optical analysis device for illuminating and analyzing a sample comprises a lighting device according to the invention with which the sample can be irradiated with a light of several wavelengths; and a spectral sensor device with which a light reflected from the sample can be received and spectrally analyzed.

The sample can advantageously be irradiated in a targeted manner with specific wavelengths and the reflection spectrum of the sample can then be analyzed by the spectral sensor device.

According to a preferred embodiment of the optical analysis device, the spectral sensor device can comprise a spectrometer or an imaging hyperspectral sensor.

The spectrometer can advantageously generate an absorption spectrum of light reflected on the sample.

According to the invention, a light source is provided in the method for producing a lighting device; arranging a wavelength-converting device in an emission region of the light source, at least a first converter region being produced with a first wavelength-converting material and a second converter region being produced with a second wavelength-converting material, the first converter region being configured to convert light from the light source into a first wavelength convert and the second converter area is set up to convert light from the light source into a second wavelength, wherein the first and the second wavelength are different, and wherein the converter areas are arranged laterally next to one another.

According to a preferred embodiment of the method, the light from the light source is converted by the first converter region into a first wavelength range and converted by the second converter region into a second wavelength range, the first wavelength range and the second wavelength range partially overlapping.

The method can also be distinguished by the features already mentioned in connection with the lighting device and their advantages, and vice versa.

Further features and advantages of embodiments of the invention emerge from the following description with reference to the accompanying drawings.

Figure list

The present invention is explained in more detail below with reference to the exemplary embodiment indicated in the schematic figures of the drawing.

• 1 eine schematische Abhängigkeit einer Abstrahlungsintensität des transmittierten Anregungslichtes und des konvertierten Lichtes eines wellenlängenkonvertierenden Materials von der Wellenlänge bei Mischung der Materialien;
• 2 eine schematische Seitenansicht einer Beleuchtungseinrichtung gemäß eines Ausführungsbeispiels der vorliegenden Erfindung;
• 3 eine schematische Seitenansicht einer Beleuchtungseinrichtung gemäß eines weiteren Ausführungsbeispiels der vorliegenden Erfindung;
• 4 eine Draufsicht auf eine Anordnung von wellenlängenkonvertierenden Materialien gemäß eines Ausführungsbeispiels der vorliegenden Erfindung;
• 5 eine schematische Abhängigkeit einer Abstrahlungsintensität des transmittierten Anregungslichtes und des konvertierten Lichtes eines wellenlängenkonvertierenden Materials von der Wellenlänge bei getrennt angeordneten Materialien mit unterschiedlichen Flächenverhältn issen;
• 6 eine schematische Seitenansicht einer Beleuchtungseinrichtung gemäß eines weiteren Ausführungsbeispiels der vorliegenden Erfindung;
• 7 eine schematische Seitenansicht einer Beleuchtungseinrichtung gemäß eines weiteren Ausführungsbeispiels der vorliegenden Erfindung;
• 8 eine schematische Seitenansicht einer Beleuchtungseinrichtung gemäß eines weiteren Ausführungsbeispiels der vorliegenden Erfindung;
• 9 eine schematische Seitenansicht einer optischen Analyseeinrichtung gemäß eines Ausführungsbeispiels der vorliegenden Erfindung; und
• 10 eine Blockdarstellung von Verfahrensschritten eines Verfahrens zum Herstellen einer Beleuchtungseinrichtung gemäß eines Ausführungsbeispiels der vorliegenden Erfindung.

Show it:

• 1 a schematic dependence of an emission intensity of the transmitted excitation light and the converted light of a wavelength-converting material on the wavelength when the materials are mixed;
• 2 a schematic side view of a lighting device according to an embodiment of the present invention;
• 3 a schematic side view of a lighting device according to one further embodiment of the present invention;
• 4th a plan view of an arrangement of wavelength-converting materials according to an embodiment of the present invention;
• 5 a schematic dependency of an emission intensity of the transmitted excitation light and the converted light of a wavelength-converting material on the wavelength in the case of separately arranged materials with different area ratios;
• 6th a schematic side view of a lighting device according to a further embodiment of the present invention;
• 7th a schematic side view of a lighting device according to a further embodiment of the present invention;
• 8th a schematic side view of a lighting device according to a further embodiment of the present invention;
• 9 a schematic side view of an optical analysis device according to an embodiment of the present invention; and
• 10 a block diagram of method steps of a method for producing a lighting device according to an embodiment of the present invention.

In the figures, the same reference symbols denote identical or functionally identical elements.

1 shows a schematic dependency of an emission intensity of the transmitted excitation light and the converted light of a wavelength-converting material on the wavelength when the materials are mixed;

Wavelength converting materials can include a phosphor. In order to be able to illuminate more than just one wavelength after the phosphor has been excited, several phosphors can be used, usually mixed.

The 1a shows the transmitting excitation light A1 and a resulting emission B1 for a first phosphor as intensity I as a function of the wavelength. The 1b shows the transmitted excitation light A2 and a resulting emission spectrum B2 for a second phosphor as intensity I as a function of the wavelength. In the 1c is the transmitted excitation light A3 shown where the excitation of a phosphor mixture can take place at the same wavelength, and the respective radiation spectra B1 and B2 , being compared to the radiation spectra B1 and B2 of the individual phosphors from the 1a and 1b for the phosphor mixture in the 1c a significantly lower intensity of the converted light is emitted.

If two or more phosphors are mixed, the emitted intensities I can drop, in other words the intensities can B1 and B2 in the emitted (converted) wavelengths can be halved in the best case by dividing the excitation intensity between two phosphors ( 1c ). When mixing phosphors there can be further losses in efficiency between excitation A1 or A2 (each for the two phosphors) and radiation spectra B1 and B2 occur, for example through an overlap of wavelengths of emission and excitation of the two phosphors. Efficiency losses that occur can be so great that the emission of a phosphor can be completely extinguished.

As a result, mixing different phosphors in order to be able to combine their luminous properties can lead to a negative mutual influencing of their emission.

For example, an intensity of the emitted wavelengths in the case of a mixture can be significantly lower than the sums of half the intensities in the case of a non-mixed arrangement.

The efficiency of mixed phosphors can depend on the phosphor grid matrix used, the activator (emitting element), the emission spectra and the excitation and absorption spectra.

The provision of more efficient mixtures can currently be carried out in a laborious manner by means of a trial-and-error process.

2 shows a schematic side view of a lighting device according to an embodiment of the present invention.

The lighting device 1 for emitting light of multiple wavelengths comprises a light source 10 ; a wavelength converting device 2 , which in a radiation area of the light source 10 is arranged, which has at least one first converter area KB3a with a first wavelength-converting material 3a and a second converter area KB3b 'with a second wavelength-converting material 3b comprises, the first converter area KB3a to this is set up to receive light from the light source 10 to convert into a first wavelength range and the second converter range KB3b 'is set up to receive light from the light source 10 to convert into a second wavelength range, wherein the first and the second wavelength range are different, but may overlap, and wherein the converter ranges KB3a and KB3b 'are arranged laterally next to one another. The two or more existing wavelength-converting materials can differ in their light-converting effect and emit light of different wavelength ranges. Instead of wavelength ranges, individual wavelengths can also be emitted.

The light source 10 can for example comprise a laser or an LED.

Furthermore, the wavelength converting device 2 with the converter areas KB3a and KB3b 'each directly on the light source 10 be arranged and be in direct contact with it. The two converter areas or, alternatively, several converter areas (not shown) can be the light source 10 cover, for example, equal parts of the surface or areas of the surface of the light source of different sizes 10 cover.

In the execution of the 2 can the lighting device 1 comprise a cavity K, for example in a substrate, advantageously with sloping side walls towards the opening of the cavity. The substrate 1a can be done for by the light source 10 emitted radiation be reflective. The light source can be in the cavity K 10 be arranged and the converter areas (KB3a, KB3b ', ...) can at least partially fill the cavity.

By at least one of the first and / or second wavelength-converting materials 3a or 3b can get the light from the light source 10 be convertible to an infrared or near-infrared range. The two wavelength converting materials 3a and 3b can advantageously be arranged in the cavity at the same time (in one step, for example dispensed).

The arrangement from the 2 a particularly compact shape of the lighting device can be achieved.

3 shows a schematic side view of a lighting device according to a further embodiment of the present invention.

The lighting device 1 the 3 differs from that from the 2 that the cavity K is not filled by wavelength-converting materials, but the wavelength-converting device 2 a carrier 2a comprises, on which the converter areas KB3a, KB3b ', ..., KB3n, that is, several of these, can be arranged, and the carrier 2a spaced from the light source 10 in an emission direction of the light from the light source 10 can be arranged. Here, the carrier 2a the wavelength converting materials 3a , 3b , ..., 3n embrace at one bottom ( 3a) , which the cavity K can face. The carrier 2a can comprise a transparent plate, for example a glass plate, which can be transparent to the converted radiation. According to another embodiment, for example in the 3b , can use the wavelength converting materials 3a , 3b , ..., 3n on a top of the carrier 2a be arranged and facing away from the cavity K. The carrier 2a can cover the cavity K advantageously completely or at least partially (not shown). By arranging them on a carrier, greater freedom for placing or orienting the phosphors can be achieved.

4th shows a plan view of an arrangement of wavelength-converting materials according to an embodiment of the present invention.

The arrangement of the wavelength converting materials 3a and 3b as in the 4a , 4b or 4c shown, may apply to their arrangement in the cavity or on the carrier. In the 4a can the second wavelength converting material 3b a circle around the center of the area under consideration, i.e. the wavelength-converting device 2 in their optical axis. The first wavelength converting material 3a can laterally outside, for example directly adjoining it, and the second area 3b surrounding, be arranged. After 4b can do both areas 3a and 3b be arranged symmetrically around a separation axis, advantageously parallel to one another and with the same dimensions. In the 4c can do both areas 3a and 3b be arranged similar to a checkerboard pattern, so the wavelength converting device 2 a plurality of regions KB3a and KB3b 'comprising first and second wavelength converting materials. The arrangements of the 4a - 4c can also turn out differently, for example with unequal areas in the 4b , or each with several different materials or other shapes or other proportions.

The 5a and 5b show a schematic dependence of an emission intensity of the transmitted excitation light and the converted emission spectrum of a wavelength-converting material on the wavelength at separately arranged materials with different area ratios. The dashed lines for B1 and B2 show radiation spectra which would only arise if the respective phosphor alone was excited. The transmitted excitation light is marked with A3. The phosphor B1 is for example to the top right in the 5a The arrangement shown is distributed according to the area KB3a, which can have a smaller proportion of the total area (radiating area) than the second area KB3b '. The radiated portion of B2 thus also has a higher emission intensity. The distribution ratio of the converting materials over the area can thus determine the radiation intensities of the areas B1 and B2 influence.

The 5b shows a corresponding radiation characteristic for both phosphors, such as 5a , but with the opposite distribution of the surface areas of the radiating surface. An increased radiation intensity for the first area can thus be achieved B1 be achievable. In general, by separating the phosphors, a higher emission intensity can be achieved than with a mixture of phosphors.

By using several wavelength-converting materials, an intensity profile of the emitted wavelengths in the emission spectrum can be improved; in particular, the spectral intensity profile, that is to say over the wavelengths, can have a smoother profile than a single phosphor. In principle, the bandwidth of the emission can also be expanded as required by a combination of phosphors. Intensity drops due to mutual absorptions, for example as with a mixture of phosphors, can also be better avoided or reduced. It should also be noted that for usage scenarios in which the PC-LED is operated at higher frequencies, the rise and fall times of the intensities of the various phosphors can be optimized independently of one another.

6th shows a schematic side view of a lighting device according to a further embodiment of the present invention.

After 6th can also be a combination of one with the wavelength-converting material, for example the first material 3a , filled cavity K and a carrier 2a with wavelength-converting materials arranged thereon 3a , 3b , ..., 3n , such as on a top or bottom (not shown) of the carrier 2a , to be provided. The carrier 2a can of the first wavelength-converting material 3a , which is arranged in the cavity, be spaced. Due to the spacing, the wavelength-converting material ( 3b or others) thermally from the light source 10 be decoupled, for example such a distance between the warm light source 10 and the wavelength-converting material are selected large enough to minimize thermal quenching (decrease in intensity of the radiation of the wavelength-converting material due to the action of heat). A distance between the wavelength-converting material and the sample to be irradiated can be very small.

The carrier 2a can separate areas KB3b 'with the second wavelength converting material 3b comprise, or (not shown) comprise several different or identical wavelength-converting materials separated or adjacent to one another. Furthermore, one of the wavelength-converting materials can also be flat, for example over the entire carrier 2a , and a second or more wavelength-converting materials can be arranged in areas (structured) on this flat design (not shown). The carrier 2a can, for example, as a substrate, thereby the cavity or the entire lighting device 1 , such as an LED.

The emitted portion and the strength of the emitted intensity of the respective phosphors (wavelength-converting materials) can also be influenced by the thickness of the respective wavelength-converting materials independently of the other materials, since more light can be converted in thick (geometric) phosphor layers than in thinner phosphor layers. A large number of first and second converter areas (KB3a, KB3b ', ..., KB3n) can be arranged on the carrier or the cavity or further carriers, with a ratio of first converter areas (KB3a, KB3b, ..., KB3n) to second converter areas (KB3a ', KB3b', ..., KB3n ') the ratio of the intensity of light of the first wavelength range to the intensity of light of the second wavelength range can be set.

7th shows a schematic side view of a lighting device according to a further embodiment of the present invention.

In the 7a and 7b different shapes of the wavelength-converting areas KB3a and KB3b 'with the respective associated materials 3a and 3b on the carrier 2a ( 7a) or in the carrier 2a ( 7b) shown, which can be on the top of the carrier in both cases. In this way, several converting materials can also be present on an upper and / or lower side of the carrier (not shown). In the 7a is a round surface shape of the wavelength converting materials 3a and 3b shown. Such external shapes of the wavelength-converting areas can have an optical effect for the have converted light and / or for the light transmitted through the wavelength-converting region, for example a lens effect or a variation of the spectrum over different emission angles.

After 7b can the carrier 2a before applying the wavelength converting materials 3a and 3b already include recesses, in which then the wavelength-converting materials 3a and 3b can then be introduced (for example applied or dispensed), for example a flow of the wavelength-converting materials can be restrained and one in the areas KB3a and KB3b 'of the recesses in the carrier 2a defined area coverages can be generated.

8th shows a schematic side view of a lighting device according to a further embodiment of the present invention.

The 8a as well as the 8b show similar to the 7a and 7b an array of wavelength converting materials 3a and 3b in areas with the difference that the carrier 2a can be shaped as a diffuser, so about after 8a can comprise several microlenses on one side and on the other side, opposite the microlenses, the wavelength-converting regions with the wavelength-converting materials 3a and 3b may have which the carrier 2a Can cover area-wide and can be arranged directly next to one another and alternately. According to the 8b the diffuser can also comprise the wavelength-converting materials as microlenses. The microlenses can be arranged close to one another and the first and second wavelength-converting material alternating 3a and 3b or also include others (not shown). Such a diffuser can be characterized by a spatial homogenization of the radiation and a higher degree of mixing of the different spectral components of the emitted light from the lighting device can be achieved and at the same time a high degree of compactness of the lighting device can be achieved,

9 shows a schematic side view of an optical analysis device according to an embodiment of the present invention.

The optical analysis device 30th for illuminating and analyzing a sample 4th comprises a lighting device according to the invention 1 with which the sample 4th can be irradiated with a light L of several wavelengths; and a spectral sensor device 20th , for example a spectrometer or an imaging hyperspectral sensor, with which one of the sample 4th reflected light LR can be received and spectrally analyzed. Lighting device 1 can be parallel to the spectral sensor device 20th , preferably be arranged in the same housing. The lighting device 1 can after the 9 a beam with converting areas 3a , 3b and 3c include, but any other embodiment of the invention is conceivable. On the side of the spectral sensor device 20th a transparent plate OPT, or an objective or another optical element can be arranged on the housing. The housing can have a separation area, for example a wall, between the spectral sensor device 20th and the lighting device 1 include. The optical element OPT can be, for example, at least one diffractive element, a static filter or a filter that can be varied in terms of wavelengths, that is to say tunable. The wavelength converting materials 3a and 3b , or more, can be on the carrier 2a for example, be designed or applied as a cover glass or plate. The spectral sensor device 20th can comprise a detector which can be arranged downstream of a Fabry-Perot interferometer, for example. This detector can be a single-channel or multi-channel detector.

10 shows a block diagram of method steps of a method for producing a lighting device according to an embodiment of the present invention.

In the method for producing a lighting device, provision takes place S1 a light source; an arranging S2 a wavelength-converting device in an emission region of the light source, at least a first converter region being produced with a first wavelength-converting material and a second converter region being produced with a second wavelength-converting material, the first converter region being configured to convert light from the light source into a first wavelength and the second converter area is set up to convert light from the light source into a second wavelength, wherein the first and the second wavelength are different, but can overlap, and wherein the converter areas are arranged laterally next to one another.

Although the present invention has been fully described above on the basis of the preferred exemplary embodiment, it is not restricted thereto, but rather can be modified in many different ways.

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• CN 105895783 A [0005]

Claims (16)

A lighting device (1) for emitting light of several wavelengths comprising - a light source (10); - A wavelength-converting device (2) which is arranged in an emission area of the light source (10) which has at least a first converter area (KB3a, KB3b, ..., KB3n) with a first wavelength-converting material (3a) and a second converter area (KB3a ', KB3b', ..., KB3n ') with a second wavelength-converting material (3b), the first converter area (KB3a, KB3b, ..., KB3n) being set up to convert light from the light source (10) into a to convert the first wavelength and the second converter area (KB3a ', KB3b', ..., KB3n ') is set up to convert light from the light source (10) into a second wavelength, the first and the second wavelength being different, and wherein the converter areas (KB3a, KB3b ', ..., KB3n) are arranged laterally next to one another. Lighting device (1) according to Claim 1 , in which the light from the light source (10) can be converted into a first wavelength range through the first converter area (KB3a, KB3b, ..., KB3n) and through the second converter area (KB3a ', KB3b', ..., KB3n ' ) is convertible into a second wavelength range, the first wavelength range and the second wavelength range partially overlapping. Lighting device (1) according to Claim 1 or 2 , wherein the light source (10) comprises a laser or an LED. Lighting device (1) according to one of the Claims 1 to 3 , wherein the wavelength converting device (2) with the converter areas (KB3a, KB3b ', ..., KB3n) is arranged directly on the light source (10). Lighting device (1) according to Claim 4 which comprises a cavity (K) in which the light source (10) is arranged and the converter areas (KB3a, KB3b ', ..., KB3n) at least partially fill the cavity. Lighting device (1) according to one of the Claims 1 to 5 , wherein the wavelength converting device (2) comprises a carrier (2a) on which the converter areas (KB3a, KB3b ', ..., KB3n) are arranged and the carrier (2a) is spaced from the light source (10) in an emission direction of the light from the light source (10) is arranged. Lighting device (1) according to Claim 6 which comprises a cavity (K) in which the light source (10) is arranged and the carrier (2a) at least partially covers the cavity (K). Lighting device (1) according to Claim 6 or 7th , in which the converter areas (KB3a, KB3b ', ..., KB3n) are integrated in the carrier (2a) or are arranged on the carrier (2a) on a side facing away from or facing the light source (10) and have an optically effective shape . Lighting device (1) according to one of the Claims 1 to 8th , in which the light from the light source (10) can be converted into an infrared or near-infrared range by at least one of the first and / or second and / or by several wavelength-converting materials (3a, 3b, ..., 3n). Lighting device (1) according to one of the Claims 1 to 9 , which comprises a plurality of at least first and second converter areas (KB3a, KB3b ', ..., KB3n), and wherein with a ratio of first converter areas (KB3a, KB3b, ..., KB3n) to second converter areas (KB3a', KB3b ', ..., KB3n') the ratio of the intensity of light of at least the first wavelength to the intensity of light of the second wavelengths can be set. Lighting device (1) according to one of the Claims 1 to 10 , at which an intensity of a light emitted by the respective converter area (KB3a, KB3b ', ..., KB3n) can be set through a thickness of this converter area (KB3a, KB3b', ..., KB3n) and the converter areas (KB3a, KB3b ' , ..., KB3n) have the same or different thicknesses. Lighting device (1) according to one of the Claims 1 to 11 , in which the carrier (2a) comprises a diffuser. Optical analysis device (30) for illuminating and analyzing a sample (4) comprising an illumination device (1) according to one of the Claims 1 to 12 with which the sample (4) can be irradiated with a light of several wavelengths; and a spectral sensor device (20) with which a light (LR) reflected from the sample (4) can be received and spectrally analyzed. Optical analysis device (30) according to Claim 13 , in which the spectral sensor device (20) comprises a spectrometer or an imaging hyperspectral sensor. A method for producing a lighting device (1) comprises the steps: - providing (S1) a light source (10); - Arranging (S2) a wavelength converting device (2) in a radiation area of the Light source (10), wherein at least a first converter area (KB3a, KB3b, ..., KB3n) with a first wavelength-converting material (3a) and a second converter area (KB3a ', KB3b', ..., KB3n ') with a second wavelength-converting material (3b) is generated, the first converter area (KB3a, KB3b, ..., KB3n) being set up to convert light from the light source (10) into a first wavelength and the second converter area (KB3a ', KB3b' , ..., KB3n ') is set up to convert light from the light source (10) into a second wavelength, the first and second wavelengths being different, and the converter areas (KB3a, KB3b', ..., KB3n) are arranged laterally next to one another. Procedure according to Claim 15 , in which the light from the light source (10) is converted by the first converter area (KB3a, KB3b, ..., KB3n) into a first wavelength range and by the second converter area (KB3a ', KB3b', ..., KB3n ' ) is converted into a second wavelength range, the first wavelength range and the second wavelength range partially overlapping.

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