Wavelength conversion assembly, light source device and lighting device

Abstract

The invention discloses a wavelength conversion assembly, a light source device and a lighting device. The wavelength conversion assembly includes a substrate having a first pit; the fluorescent particles and the adhesive phase cover the first pit to form the fluorescent material layer; the fluorescent material layer is used for receiving the exciting light and generating excited light based on the exciting light; the fluorescent material layer comprises N areas distributed from the center position of the first pit to the edge position of the first pit, and N is a positive integer greater than or equal to 2; a first area located at the center position of the first pit has a first thickness, and an Nth area located at the edge position of the first pit has an Nth thickness; multiplying the first thickness by the unit area to obtain a first volume, and multiplying the Nth thickness by the unit area to obtain an Nth volume; wherein the content of fluorescent particles in the first volume is higher than the content of fluorescent particles in the Nth volume. The intensity characteristics of the incident excitation light are matched by controlling the fluorescent particle content in the first volume and the Nth volume.

Description

Technical Field

[0001] The present application relates to the field of lighting and display technology, and in particular to a wavelength conversion component, a light source device and a lighting device. Background Art

[0002] When producing white light, the LED lighting industry usually uses lens focusing to project light spots in order to improve the utilization rate of light energy.

[0003] However, the light spot projected by the lens has inconsistent color temperature because the intensity of the light at the edge and the color temperature of the light at the center are inconsistent. Summary of the invention

[0004] The present application provides a wavelength conversion component, a light source device and an illumination device to solve the technical problem of inconsistent color temperature of a light spot projected by a lens in the prior art.

[0005] To solve the above problems, the first aspect of the present application provides a wavelength conversion component, which includes: a substrate having a first pit; a fluorescent material layer, in which fluorescent particles and an adhesive are covered on the first pit to form a fluorescent material layer; the fluorescent material layer is used to receive excitation light and generate stimulated light based on the excitation light; the fluorescent material layer includes N regions distributed from the center position of the first pit to the edge position of the first pit, where N is a positive integer greater than or equal to 2; the first region located at the center position of the first pit has a first thickness, and the Nth region located at the edge position of the first pit has an Nth thickness; the first thickness multiplied by a unit area obtains a first volume, and the Nth thickness multiplied by a unit area obtains an Nth volume; wherein the content of fluorescent particles in the first volume is higher than the content of fluorescent particles in the Nth volume.

[0006] Further, the first thickness is greater than the Nth thickness.

[0007] Furthermore, in the first volume, the volume proportion of the fluorescent particles is the first volume proportion, and in the Nth volume, the volume proportion of the fluorescent particles is the Nth volume proportion, and the first volume proportion is greater than the Nth volume proportion; wherein, the volume proportion of the fluorescent particles refers to the volume of the fluorescent particles divided by the sum of the volume of the fluorescent particles and the volume of the bonding phase within a unit volume.

[0008] Furthermore, the content of the fluorescent particles in the first volume to the Nth volume gradually decreases and presents a Gaussian distribution.

[0009] Furthermore, the substrate has a plurality of second pits, the plurality of second pits are arranged at the bottom of the first pit, and the size of each second pit is smaller than the size of the first pit.

[0010] Further, the first pit includes a plurality of adjacently arranged sub-pits, and in a cross section of the first pit, the plurality of sub-pits extend in an ascending step-like manner from a center position of the first pit to an edge position of the first pit.

[0011] Furthermore, each sub-pit has the same shape, which is one of a regular triangle, a regular quadrilateral, or a regular hexagon.

[0012] Further, the first pit includes a plurality of adjacently arranged sub-pits, and in a cross section of the first pit, the plurality of sub-pits are connected to each other from a center position of the first pit to an edge position of the first pit.

[0013] Furthermore, the shape of the first sub-pit is a hemispherical surface, a semi-ellipsoidal surface or a spherical crown, and the shapes of the second sub-pit to the Nth sub-pit are fan-shaped rings.

[0014] Furthermore, the first thickness to the Nth thickness gradually decrease and present a Gaussian distribution.

[0015] Furthermore, the first volume proportion to the Nth volume proportion gradually decreases and presents a Gaussian distribution.

[0016] To solve the above-mentioned problem, the second aspect of the present application provides a light source device, including a laser light source for emitting excitation light; a first lens group for emitting and focusing the excitation light emitted by the laser light source; the above-mentioned wavelength conversion component for receiving the excitation light emitted and focused by the first lens group, and generating a stimulated light based on the excitation light; a second lens group, arranged on the light-emitting side of the wavelength conversion component, for emitting the emitted light.

[0017] In order to solve the above-mentioned problem, the third aspect of the present application provides a lighting device, comprising the above-mentioned light source device and a shell, wherein the shell forms a receiving space for receiving the light source device.

[0018] Furthermore, the shell is provided with a light blocking portion and an exit port in the exit direction of the exit light, the light blocking portion is used to block part of the exit light, and the exit port is used to emit part of the exit light.

[0019] Furthermore, it also includes: a light-transmitting sheet, which is arranged at the front end of the light-blocking portion and covers the exit port, so that part of the exiting light passes through the exit port and the light-transmitting sheet in sequence; a light-absorbing material layer, which is covered on the edge area of ​​the light-blocking portion and / or the edge area of ​​the light-transmitting sheet, and is used to absorb the exiting light of the edge part.

[0020] The beneficial effect of the present application is that, different from the prior art, the wavelength conversion component of the present application divides the fluorescent material layer into N regions, and controls the fluorescent particle content in the first volume to be higher than the fluorescent particle content in the Nth volume, so as to match the intensity characteristics of the incident excitation light, that is, to match the intensity characteristics of the incident excitation light with high intensity in the central part and low intensity in the edge part, so that the color temperature of the light emitted in the first region is consistent with that of the light emitted in the Nth region, so that the color temperature of the light spot finally formed is consistent. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 is a cross-sectional view of the first embodiment of the wavelength conversion component of the present application;

[0023] Figure 2 is a cross-sectional view of a second embodiment of a wavelength conversion component of the present application;

[0024] Figure 3 is a cross-sectional view of a first embodiment of a sub-pit in a wavelength conversion component of the present application;

[0025] Figure 4 is a top view of a first embodiment of a sub-pit in a wavelength conversion component of the present application;

[0026] Figure 5 is a cross-sectional view of a second embodiment of a sub-pit in a wavelength conversion component of the present application;

[0027] Figure 6 is a top view of a second embodiment of a sub-pit in a wavelength conversion component of the present application;

[0028] Figure 7 It is a structural schematic diagram of the light source device of the present application;

[0029] Figure 8 It is a schematic diagram of the structure of the housing in the lighting device of the present application;

[0030] Fig. 9 It is a structural schematic diagram of the lighting device of the present application;

[0031] Fig.10 It is a schematic diagram of a process of an embodiment of the preparation method of the present application.

[0032] Figure numerals: wavelength conversion component 10; substrate 11; fluorescent material layer 12; first pit 111; second pit 112; sub-pit 113; light source device 20; laser light source 21; first lens group 22; second lens group 23; lighting device 30; housing 31; light blocking portion 311; exit port 312; light-transmitting sheet 32. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0034] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0035] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0036] During the research process, the inventor of this application found that the LED lighting industry usually uses reflective cups or lens focusing methods to achieve light projection when producing white light. The reflective cup focusing method has poor focusing effect and low light energy utilization rate; the lens focusing method has high light energy utilization rate, but the color temperature of the light spot finally formed by lens projection is inconsistent, that is, the color presented at the edge of the light spot is inconsistent with the color presented at the center.

[0037] The principle of lens focusing is that the wavelength conversion component will convert the wavelength under the excitation of the excitation light and generate the stimulated light. The converted excitation light and the unconverted excitation light are combined to obtain white light (i.e., the output light), which is projected through the lens to form a light spot. For example, the wavelength conversion component will convert the wavelength under the blue excitation light and generate yellow-green stimulated light. The yellow-green stimulated light and the unconverted blue excitation light are combined to obtain white light, which is projected through the lens to form a light spot.

[0038] The reason why the color of the edge of the light spot formed by lens projection is inconsistent with the color of the center is that the intensity characteristics of the incident excitation light cause the ratio between the converted excitation light and the unconverted excitation light to not meet the requirements of synthetic white light. Specifically, the intensity characteristics of the incident excitation light affect the ratio of the unconverted excitation light. The incident excitation light has a Gaussian distribution characteristic in terms of intensity, that is, the intensity of the light from the center part to the edge part of the incident excitation light gradually changes from high to low, so the ratio of the unconverted excitation light from the center position to the edge position of the wavelength conversion component also gradually changes from high to low. Therefore, the color of the edge of the light spot formed by lens projection is inconsistent with the color of the center. Specifically, the edge of the light spot has a lower ratio of unconverted excitation light, and the color of the edge of the light spot is the converted excitation light. The center of the light spot has a higher ratio of unconverted excitation light, and the color of the edge of the light spot is the unconverted excitation light. For example, the edge of the light spot formed by lens projection is yellow, and the center is blue, that is, a light spot with a yellow aperture and a blue center.

[0039] The inventor proposes a wavelength conversion component to solve the technical problem of inconsistent color temperature of a light spot projected by a lens in the prior art.

[0040] See also Figure 1 As shown, Figure 1 1 is a cross-sectional view of the first embodiment of the wavelength conversion component of the present application. The wavelength conversion component 10 of this embodiment is applied to a lighting device. The wavelength conversion component 10 is arranged on the optical path of the excitation light, and the wavelength conversion component 10 is used to receive the excitation light incident from the outside, and generate the converted light under the excitation of the excitation light. For example, the blue excitation light received by the wavelength conversion component 10 generates the yellow-green converted light under the excitation of the blue excitation light.

[0041] The wavelength conversion component 10 includes a substrate 11 and a fluorescent material layer 12 .

[0042] The substrate 11 is made of quartz glass. Quartz glass is an amorphous material with a single component of silicon dioxide. Its microstructure is a simple network composed of silicon dioxide tetrahedral structural units. Since the Si-O chemical bond energy is large and the structure is very compact, quartz glass has unique properties, especially transparent quartz glass has excellent optical properties and has excellent transmittance in the continuous wavelength range from ultraviolet to infrared radiation. Quartz glass uses high-purity silica sand as raw material, and the traditional method of making it is a melting-quenching method (heating the material to the melting temperature and then rapidly cooling it to the solid phase of the glass).

[0043] The substrate 11 has a first pit 111, and the first pit 111 is arranged at the center of the substrate 11. Specifically, the substrate 11 is etched using laser processing technology to form the first pit 111 on the substrate 11. The etching of quartz glass by laser processing technology is mainly divided into laser direct etching method, laser induced plasma etching method, laser back wet etching method, etc. There are two types of direct etching of quartz glass by laser direct etching method. For infrared laser etching of quartz glass, a carbon dioxide laser with a wavelength of 10.6 microns is generally used as a heat source, because quartz glass has a high absorption rate for light of this wavelength. The infrared light is focused on the quartz surface by an optical system, and the quartz glass absorbs high-energy laser to melt and vaporize to complete the etching. For ultraviolet laser etching of quartz glass, a short wavelength (KrF: 248nm, ArF: 193nm) excimer pulse laser is generally used to achieve precise quartz etching. For ultraviolet nanosecond pulse laser, its etching mechanism is based on avalanche ionization. A few free electrons in quartz absorb laser energy. When the electron kinetic energy is greater than the ionization potential of the bound electron, it collides with the atom to ionize and produce two free electrons with lower kinetic energy. This process can replicate itself. When the laser energy is high enough, the density of free electrons will increase exponentially. Once the plasma reaches the critical density, the quartz material will become a light-absorbing material and damage will occur. Both laser-induced plasma etching and laser back wet etching use laser to interact with the target material through quartz glass to generate plasma to etch the bottom surface of quartz glass. The difference between them is that the target material used in the laser-induced plasma etching method is generally solid metal, mostly stainless steel and copper; while the target material of the laser back wet etching method is generally based on organic solvents.

[0044] The fluorescent particles and the adhesive are arranged on the first pit 111 to form a fluorescent material layer 12. The wavelength conversion component 10 generates a converted light under the excitation of the excitation light. Specifically, the fluorescent material layer 12 in the wavelength conversion component 10 receives the excitation light incident from the outside and generates a converted light under the excitation of the excitation light.

[0045] The fluorescent material layer 12 is divided into a plurality of regions, and the plurality of regions are N regions distributed along the center position of the first pit 111 to the edge position of the first pit 111, that is, the first region is located in the first region at the center position of the first pit 111, and the Nth region is located at the edge position of the first pit 111, and N is a positive integer greater than or equal to 2; and the first region has a first thickness, and the first thickness multiplied by the unit area obtains a first volume, and the Nth region has an Nth thickness; the Nth thickness multiplied by the unit area obtains an Nth volume, and in order to solve the technical problem of inconsistent color temperature of the light spot projected by the lens in the prior art, the content of fluorescent particles in the first volume is controlled to be higher than the content of fluorescent particles in the Nth volume. Among them, the unit area refers to the unit area in the top view of the wavelength conversion component 10, the first thickness refers to the depth of the fluorescent material layer 12 at the center position of the first pit 111 in the cross-sectional view of the wavelength conversion component 10, and the Nth thickness refers to the depth of the fluorescent material layer 12 at the edge position of the first pit 111 in the cross-sectional view of the wavelength conversion component 10.

[0046] The purpose of controlling the content of fluorescent particles in the first volume to be higher than that in the Nth volume is to match the intensity characteristics of the incident excitation light, that is, to match the intensity characteristics of the incident excitation light, that is, the intensity of the light in the center part is high and the intensity of the light in the edge part is low. The specific description is as follows:

[0047] It can be understood that the area where the light of the central part of the incident excitation light is incident is the central position of the fluorescent material layer 12, that is, the excitation light received by the first area is the light of the central part of the incident excitation light; the area where the light of the edge part of the incident excitation light is incident is the edge position of the fluorescent material layer 12, that is, the excitation light received by the Nth area is the light of the edge part of the incident excitation light. The content of fluorescent particles in the first volume is higher than that in the Nth volume, so the first area can perform wavelength conversion on more excitation light, increase the proportion of converted excitation light in the first area, so that the ratio between the converted excitation light and the unconverted excitation light in the first area meets the requirements of synthetic white light; in the Nth area, on the contrary, the proportion of converted excitation light in the Nth area is reduced, and finally the ratio between the converted excitation light and the unconverted excitation light in the Nth area also meets the requirements of synthetic white light, so that the color temperature of the light emitted in the first area is consistent with that of the light emitted in the Nth area, so that the color temperature of the finally formed light spot is consistent.

[0048] In addition, in order to more finely match the intensity characteristics of the incident excitation light, the larger the positive integer N is, the better the effect. However, since the manufacturing difficulty of the first pit 111 will also increase accordingly, in order to balance the manufacturing difficulty and the requirement of more finely matching the characteristics of the incident laser spot, N can be a positive integer between 3-10, for example, N is 3, 4, 5, 6, 7, 8, 9, 10.

[0049] By dividing the fluorescent material layer into N regions, and by controlling the fluorescent particle content in the first volume to be higher than the fluorescent particle content in the Nth volume, so as to match the intensity characteristics of the incident excitation light, that is, matching the intensity characteristics of the incident excitation light with high intensity in the central part and low intensity in the edge part, the proportional relationship between the converted excitation light and the unconverted excitation light in the first region and the Nth region meets the requirements of synthetic white light, so that the color temperature of the light emitted in the first region is consistent with that of the light emitted in the Nth region, and the color temperature of the light spot finally formed is consistent.

[0050] In some embodiments of the present application, controlling the content of fluorescent particles in the first volume to be higher than the content of fluorescent particles in the Nth volume can be achieved specifically by controlling the thickness, that is, controlling the first thickness to be larger than the Nth thickness.

[0051] In some embodiments of the present application, controlling the content of fluorescent particles in the first volume to be higher than the content of fluorescent particles in the Nth volume can be achieved specifically by controlling the volume ratio of the fluorescent particles. The volume ratio of the fluorescent particles refers to the volume of the fluorescent particles divided by the sum of the volume of the fluorescent particles and the volume of the bonding phase within a unit volume. In the first volume, the volume ratio of the fluorescent particles is the first volume ratio, and in the Nth volume, the volume ratio of the fluorescent particles is the Nth volume ratio, that is, the first volume ratio is greater than the Nth volume ratio.

[0052] At the same time, under the condition that the content of fluorescent particles in the first volume is ensured to be higher than the content of fluorescent particles in the Nth volume, the first thickness and the Nth thickness may be the same or different.

[0053] In other embodiments of the present application, since the intensity characteristics of the incident excitation light are reflected in that the intensity of the light in the center part of the incident excitation light is high and the intensity of the light in the edge part is low, the intensity of the light from the center part to the edge part of the incident excitation light gradually changes from high to low and presents a Gaussian distribution. Therefore, the content of fluorescent particles in the first volume to the Nth volume is further controlled to gradually decrease and present a Gaussian distribution, so as to further better match the intensity characteristics of the incident excitation light.

[0054] In some embodiments of the present application, the substrate 11 has a plurality of second pits 112, see Figure 2 As shown, Figure 21 is a cross-sectional view of the second embodiment of the wavelength conversion component of the present application. A plurality of second pits 112 are arranged at the bottom of the first pit 111, and the size of each second pit 112 is smaller than the size of the first pit 111. The second pit 112 is used to increase the roughness of the surface of the first pit 111, thereby strengthening the adhesion between the fluorescent particles and the first pit 111, thereby improving the stability of the wavelength conversion component 10; in addition, the excitation light will have a scattering effect at the second pit 112, and the setting of the second pit 112 increases the excitation area of ​​the excitation light.

[0055] Optionally, the diameter of the second pit 112 ranges from 10 to 30 um.

[0056] Optionally, the cross-sectional shape of the first pit 111 can be set to a semicircular or semi-elliptical shape, in which case the first thickness is greater than the Nth thickness, and the first volume ratio is controlled to be equal to the Nth volume ratio, so that the content of fluorescent particles in the first volume is higher than the content of fluorescent particles in the Nth volume. Specifically, the cross-sectional shape of the first pit 111 can also be set to a rectangular shape, in which case the first thickness is the same as the Nth thickness, and the first volume ratio is controlled to be greater than the Nth volume ratio, so that the content of fluorescent particles in the first volume is higher than the content of fluorescent particles in the Nth volume.

[0057] Optionally, the first pit 111 includes a plurality of adjacently arranged sub-pits 113 , that is, the first pit 111 is formed by combining the plurality of sub-pits 113 , and the arrangement of the plurality of sub-pits 113 reduces the difficulty of etching the first pit 111 on the substrate 11 .

[0058] It is worth mentioning that the multiple sub-pits 113 and the fluorescent particles covered thereon only need to meet the condition that the content of fluorescent particles in the first volume is higher than the content of fluorescent particles in the Nth volume, and other conditions are not limited. For example, the type of fluorescent particles in each sub-pit 113 can be the same or different; the thickness of the first sub-pit can be sequentially reduced to the thickness of the Nth sub-pit, or the thickness of the first sub-pit can be sequentially increased to the thickness of the Nth sub-pit; the volume proportion of fluorescent particles in the first sub-pit can be sequentially reduced to the volume proportion of fluorescent particles in the Nth sub-pit, or the volume proportion of fluorescent particles in the first sub-pit can be sequentially increased to the volume proportion of fluorescent particles in the Nth sub-pit.

[0059] Taking the example of forming a first concave pit 111 with a semicircular or semi-elliptical cross-sectional shape by combining a plurality of sub-concave pits 113 , two arrangements of the sub-concave pits 113 are provided.

[0060] Optionally, the first arrangement of the sub-pit 113 can be seen in Figure 3 and Figure 4 As shown, Figure 3 is a cross-sectional view of a first embodiment of a sub-pit in a wavelength conversion component of the present application, Figure 4 It is a top view of the first embodiment of the sub-pit in the wavelength conversion component of the present application.

[0061] In the cross section of the first pit 111 , the plurality of sub-pits 113 extend from the center of the first pit 111 to the edge of the first pit 111 in an ascending step-like manner.

[0062] For example, the first pit 111 includes three sub-pits 113 distributed from the center position of the first pit 111 to the edge position of the first pit 111, the first sub-pit is located at the center position, and the second sub-pit and the third sub-pit are distributed in sequence toward the edge position of the sub-pit, wherein the depth of the first sub-pit decreases in sequence to the third sub-pit. The content of fluorescent particles in the first sub-pit is higher than that in the third sub-pit.

[0063] Optionally, the content of the fluorescent particles in the first sub-pit decreases sequentially to the content of the fluorescent particles in the third sub-pit and presents a Gaussian distribution.

[0064] Optionally, in order to further reduce the difficulty of etching, each sub-pit 113 has the same shape and size in a top view, and the shape is one of a regular triangle, a regular quadrilateral, or a regular hexagon. Figure 4 The top view shape of each sub-pit 113 is a regular hexagon.

[0065] Optionally, the second arrangement of the sub-pit 113 can be seen in Figure 5 and Figure 6 As shown, Figure 5 is a cross-sectional view of a second embodiment of a sub-pit in a wavelength conversion component of the present application, Figure 6 It is a top view of the second embodiment of the sub-pit in the wavelength conversion component of the present application.

[0066] In the cross section of the first pit 111 , a plurality of sub-pits are connected to each other from the center position of the first pit to the edge position of the first pit.

[0067] For example, the first pit 111 includes three sub-pits 113 distributed along the center position of the first pit 111 to the edge position of the first pit 111, the first sub-pit is located at the center position, and the second sub-pit and the third sub-pit are distributed in sequence toward the edge position of the sub-pit, wherein the shape of the first sub-pit is a hemispherical surface, a hemispherical surface or a spherical crown, and the top view shape of the first sub-pit is a circle or an ellipse (the top view shape corresponding to the hemispherical surface and the spherical crown is a circle, and the top view shape corresponding to the hemispherical surface is an ellipse). Figure 6 The top view shape of the first sub-pit is a circle; the shape of the second sub-pit and the third sub-pit is a sector ring, and the top view shape of the second sub-pit and the third sub-pit is a ring. Figure 6The top view of the second sub-pit and the third sub-pit is a ring; the inner arc of the second sub-pit is connected to the circular or elliptical edge of the first sub-pit, and the inner arc of the third sub-pit is connected to the outer arc of the second sub-pit. The content of fluorescent particles in the first sub-pit is higher than that in the third sub-pit.

[0068] Optionally, the content of the fluorescent particles in the first sub-pit decreases sequentially to the content of the fluorescent particles in the third sub-pit and presents a Gaussian distribution.

[0069] Optionally, the content of fluorescent particles in the first volume to the Nth volume is controlled to gradually decrease and present a Gaussian distribution, specifically, the first thickness to the Nth thickness is controlled to gradually decrease and present a Gaussian distribution, and the proportion of the first volume to the Nth volume is controlled to remain unchanged, so that the content of fluorescent particles in the first volume to the Nth volume is gradually reduced and presents a Gaussian distribution, which can match the intensity characteristics of the incident excitation light, that is, the light intensity in the central part is high, the light intensity in the edge part is low and presents a Gaussian distribution.

[0070] Optionally, the content of fluorescent particles in the first volume to the Nth volume is controlled to gradually decrease and present a Gaussian distribution. Specifically, the proportion of the first volume to the Nth volume is controlled to gradually decrease and present a Gaussian distribution, and the first thickness to the Nth thickness is controlled to remain unchanged. Ultimately, the content of fluorescent particles in the first volume to the Nth volume is gradually reduced and presents a Gaussian distribution, which can match the intensity characteristics of the incident excitation light, that is, the light intensity in the central part is high, the light intensity in the edge part is low, and presents a Gaussian distribution.

[0071] By the above method, the content of fluorescent particles in the first volume to the Nth volume is controlled to gradually decrease and present a Gaussian distribution, so as to match the intensity characteristics of the incident excitation light, which gradually changes from high to low in the center part to the edge part, and presents a Gaussian distribution. The incident excitation light with a Gaussian distribution of intensity meets the fluorescent particles with a Gaussian distribution of content, so that the incident excitation light is uniformly converted in wavelength, that is, in the N regions distributed from the center position of the first pit 111 to the edge position of the first pit 111 by the fluorescent material layer 12, the proportion of excitation light used for wavelength conversion in each region is the same, that is, the converted excitation light divided by (converted excitation light + unconverted excitation light) is the same in the N regions, and the converted excitation light is equal to the emitted stimulated light, so the stimulated light divided by (converted excitation light + unconverted excitation light) is the same in the N regions, and the stimulated light in the N regions and the unconverted excitation light are synthesized into white light (exit light) and emitted, so that the color temperature of the white light excited by the entire spot area is finally uniform.

[0072] Optionally, the material of the substrate 11 includes quartz glass, and the material of the fluorescent material layer 12 is Y3Al5O 12 :Ce 3+ 、Lu3Al5O12 :Ce 3+ 、CaS:Eu 2+ 、ZnS:Mn 2+ 、Te 2+ The material of the fluorescent material layer 12 can be selected according to the color of the converted light generated by the fluorescent material layer 12. For example, the fluorescent material layer 12 can be set to Lu3Al5O 12 :Ce 3+ The stimulated light generated by the fluorescent material layer 12 is green or cyan. The fluorescent material layer 12 is CaS:Eu 2+ 、ZnS:Mn 2 + 、Te 2+ Or Eu2W2O7 material, the stimulated light generated by the fluorescent material layer 12 is red light or purple light.

[0073] The present application also provides a light source device 20, which can be used in LED lighting, projectors, stage lights, searchlights, car lights, and flashlights. Figure 7 , Figure 7 The light source device 20 includes a laser light source 21 , a first lens group 22 , the wavelength conversion component 10 and a second lens group 23 .

[0074] The laser light source 21 is used to emit excitation light, for example, the laser light source 21 can emit blue laser. The laser light source 21 can be a single laser or multiple lasers in an integrated array package, which is determined according to the use scenario requirements of the light source device 20.

[0075] The first lens group 22 is used to emit and focus the excitation light emitted by the laser light source 21, that is, in the process of the excitation light emitted by the laser light source 21 passing through the first lens group 22 and being emitted through the first lens group 22, the first lens group 22 focuses the excitation light to one point, that is, to the contact surface between the first pit 111 of the wavelength conversion component 10 and the fluorescent material layer 12 of the wavelength conversion component 10. The first lens group 22 needs to select one or more lenses with a suitable focal length that meets the above conditions.

[0076] The wavelength conversion component 10 is used to receive the excitation light emitted and collected by the first lens group 22, and to generate converted light under the excitation of the excitation light emitted and collected by the first lens group 22. The wavelength conversion component 10 of the present application makes the ratio between the converted excitation light (i.e., the formed converted light) and the unconverted excitation light meet the requirements of synthesizing white light.

[0077] The second lens group 23 is disposed on the light-emitting side of the wavelength conversion component 10 and is used to emit the converted excitation light (ie, the converted light) and the unconverted excitation light. After being emitted from the second lens group 23, a white light spot is formed.

[0078] Optionally, the first lens group 22 and the second lens group 23 may be, but are not limited to, borosilicate optical glass sheets or plastic lenses, wherein the plastic lenses may be made of polymethyl methacrylate (PMMA), optical resin materials, and the like.

[0079] The present application also provides a lighting device 30, see Figure 8 , 9 As shown, Figure 8 is a schematic diagram of the structure of the housing in the lighting device of the present application, Fig. 9 The lighting device 30 includes the above-mentioned light source device 20 and a housing 31 .

[0080] The shell 31 forms a accommodating space for accommodating the light source device 20, that is, for accommodating the laser light source 21, the first lens group 22, the wavelength conversion component 10 and the second lens group 23. In addition to providing a accommodating space for the laser light source 21, the first lens group 22, the wavelength conversion component 10 and the second lens group 23, the shell 31 is also used to seal and protect the laser light source 21, the first lens group 22, the wavelength conversion component 10 and the second lens group 23 to prevent external light from the external environment from appearing in the internal light path of the lighting device 30.

[0081] Considering the volume of the lighting device 30 and the size of the first recess 111 of the wavelength conversion component 10, the diameter of the housing 31 is set to 20-100 mm. Considering the firmness of the lighting device 30, the thickness of the housing 31 is set to 1-3 mm.

[0082] The material of the shell 31 is not limited here, including but not limited to stainless steel, metal, alloy, hard plastic. When the shell 31 is made of metal, the surface of the shell 31 needs to be treated with anti-oxidation and anti-corrosion. For example, the anti-oxidation treatment can be selected by coating the metal surface with mineral oil, paint or fired enamel, spraying, etc., or plating a layer of metal that is not easy to rust on the metal surface by electroplating, hot-dip plating, etc., or using chemical methods to form a dense and stable oxide film on the metal surface; the anti-corrosion treatment prevents metal corrosion from two aspects: structural design and surface treatment: the structural design includes preventing sharp corners from appearing at the edges and corners, otherwise the sharp corners will corrode first; welding should minimize spot welding, the welding surface should be polished smooth, and all splashing welding slag should be removed; the surface treatment includes one or more of the traditional surface treatment methods such as electroplating, electrophoresis, bluing (blackening) passivation, phosphating, spraying, coloring, baking paint, impregnation, shot blasting, sandblasting, etc. Electroplating refers to a surface processing method in which the metal of the housing 31 is used as the cathode in a salt solution containing the pre-plated metal, and the cations of the pre-plated metal in the plating solution are deposited on the metal surface of the housing 31 through electrolysis to form a coating. Bluing is a process in which a metal is heated to an appropriate temperature in air-water vapor or chemicals to form a blue or black oxide film on its surface. It is also called blackening. The oxide film formed has an outer layer mainly of ferroferric oxide and an inner layer of ferrous oxide.

[0083] Optionally, the housing 31 is provided with a light blocking portion 311 and an exit port 312 in the exit direction of the exit light. The light blocking portion 311 is disposed at the front end of the second lens group 23 for blocking part of the exit light, and is specifically disposed at the front end of the edge area of ​​the second lens group 23 for blocking part of the exit light exiting from the edge area of ​​the second lens group 23.

[0084] By blocking this part of the emitted light, the light blocking portion 311 further ensures that the ratio between the converted excitation light (i.e., the converted stimulated light) and the unconverted excitation light ultimately used to form the light spot meets the requirements of synthetic white light, thereby reducing the yellow aperture at the edge of the light spot.

[0085] The light blocking portion 311 forms an emission port 312 , and part of the emitted light emitted from the non-edge region of the second lens group 23 is emitted from the emission port 312 .

[0086] Optionally, the lighting device 30 further includes a light-transmitting sheet 32 ​​and a light-absorbing material layer (not shown).

[0087] The light-transmitting sheet 32 ​​covers the exit port 312 , so part of the light emitted from the non-edge area of ​​the second lens group 23 is emitted from the exit port 312 and then from the light-transmitting sheet 32 ​​, entering the external environment to form a white light spot, thereby realizing the lighting function of the lighting device 30 .

[0088] The light-transmitting sheet 32 ​​is disposed at the front end of the light-blocking portion 311 for the convenience of disposing the light-transmitting sheet 32 ​​.

[0089] In addition, the light-transmitting sheet 32 ​​is combined with the housing 31 for sealing and protection.

[0090] The light-absorbing material layer can absorb the outgoing light, and the aforementioned light-blocking portion 311 is used to block part of the outgoing light. Specifically, the light-absorbing material layer covering the edge area of ​​the light-blocking portion 311 and / or the edge area of ​​the light-transmitting sheet 32 ​​absorbs the outgoing light at the edge part to achieve blocking of part of the outgoing light.

[0091] The light absorbing material layer is disposed at the edge area of ​​the light blocking portion 311 and / or the edge area of ​​the light transmitting sheet 32 ​​instead of providing a separate supporting component. This simplifies the internal structure of the lighting device 30 while playing the role of the light absorbing material layer.

[0092] Optionally, the diameter of the light-transmitting sheet 32 ​​is between 10 and 80 mm; the thickness of the light-transmitting sheet 32 ​​is between 0.3 and 3 mm, and may be 1 mm.

[0093] The material of the light-transmitting sheet 32 ​​may be any material that satisfies the condition that light can pass through smoothly, including but not limited to borosilicate optical glass, quartz glass, and sapphire. The light can pass through smoothly means that the transmittance of the light-transmitting sheet 32 ​​is between 90% and 99%.

[0094] Optionally, the light absorbing material layer may be a black light absorbing material.

[0095] Optionally, the size and shape of the light spot can be controlled by making specific arrangements for the housing 31 and the light-transmitting sheet 32 ​​.

[0096] This application also provides a preparation method, see Fig.10 , Fig.10 1 is a flow chart of an embodiment of a preparation method of the present application. The preparation method is used to prepare the wavelength conversion component 10 in the above embodiment, and includes the following steps.

[0097] Step S1: providing a substrate, and setting a first pit on the substrate.

[0098] A substrate 11 is provided. Specifically, a sol-gel process technology can be used to manufacture a quartz glass substrate.

[0099] A first pit 111 is provided at the center of the substrate 11, and the depth of the middle region of the first pit 111 is greater than the depth of the edge region. Specifically, the substrate 11 may be etched using laser processing technology to form the first pit 111 at the center of the substrate 11. Laser processing technology for etching quartz glass is mainly divided into laser direct etching, laser induced plasma etching, laser back wet etching, and the like.

[0100] Step S2: Cover the fluorescent particles and the adhesive on the first pit to form a fluorescent material layer on the first pit; the fluorescent material layer includes N areas distributed from the center position of the first pit to the edge position of the first pit, and N is a positive integer greater than or equal to 2; the first area located at the center position of the first pit has a first thickness, and the Nth area located at the edge position of the first pit has an Nth thickness; the first thickness multiplied by the unit area obtains the first volume, and the Nth thickness multiplied by the unit area obtains the Nth volume; wherein the fluorescent particle content in the first volume is higher than the fluorescent particle content in the Nth volume.

[0101] The fluorescent particles are bonded together by the bonding phase, and the bonding phase can make the connection between the fluorescent particles more firm, thereby forming a more stable fluorescent material layer 12 .

[0102] Specifically, when covering the first pit 111 with fluorescent particles, attention is paid to the fluorescent particle content in the first volume and the fluorescent particle content in the Nth volume, so that the fluorescent particle content in the first volume is higher than that in the Nth volume, and the intensity characteristics of the incident excitation light are matched, that is, the intensity characteristics of the incident excitation light with high intensity in the center part and low intensity in the edge part are matched, so that the proportional relationship between the converted excitation light and the unconverted excitation light in the first region and the Nth region meets the requirements of synthetic white light, so that the color temperature of the light emitted in the first region is consistent with that of the light emitted in the Nth region, and the color temperature of the light spot finally formed is consistent.

[0103] Optionally, the material of the aforementioned bonding phase may be glass or silica gel. For example, SiO2-B2O3-RO type glass powder (R is one or more selected from Mg, Ca, Sr, Ba, Na, K, Bi), SiO2-TiO2-Nb2O5-R'2O type glass powder (R' is one or more selected from Li, Na, K), ZnO-P2O5 type glass powder may be used.

[0104] The above description is only an implementation method of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A wavelength conversion component, characterized in that: include: A substrate having a first recess; A fluorescent material layer, wherein the fluorescent particles and the adhesive are arranged on the first pit to form the fluorescent material layer; The fluorescent material layer is used to receive the excitation light and generate the stimulated light based on the excitation light; the fluorescent material layer includes N regions distributed from the center position of the first pit to the edge position of the first pit, where N is a positive integer greater than or equal to 2; the first region located at the center position of the first pit has a first thickness, and the Nth region located at the edge position of the first pit has an Nth thickness; the first thickness multiplied by a unit area obtains a first volume, and the Nth thickness multiplied by the unit area obtains an Nth volume; The content of the fluorescent particles in the first volume is higher than the content of the fluorescent particles in the Nth volume.

2. The wavelength conversion component according to claim 1, characterized in that: The first thickness is greater than the Nth thickness.

3. The wavelength conversion component according to claim 1, characterized in that: In the first volume, the volume proportion of the fluorescent particles is the first volume proportion, and in the Nth volume, the volume proportion of the fluorescent particles is the Nth volume proportion, and the first volume proportion is greater than the Nth volume proportion; wherein, the volume proportion of the fluorescent particles refers to the volume of the fluorescent particles divided by the sum of the volume of the fluorescent particles and the volume of the bonding phase within a unit volume.

4. The wavelength conversion component according to any one of claims 1 to 3, characterized in that: The content of the fluorescent particles in the first volume to the Nth volume gradually decreases and presents a Gaussian distribution.

5. The wavelength conversion component according to any one of claims 1 to 3, characterized in that: The substrate has a plurality of second pits, the plurality of second pits are arranged at the bottom of the first pit, and the size of each second pit is smaller than the size of the first pit.

6. The wavelength conversion component according to claim 2, characterized in that: The first pit includes a plurality of adjacently arranged sub-pits. In a cross section of the first pit, the plurality of sub-pits extend in an ascending step-like manner from a center position of the first pit to an edge position of the first pit.

7. The wavelength conversion component according to claim 6, characterized in that: Each of the sub-pits has the same shape, which is one of a regular triangle, a regular quadrilateral, or a regular hexagon.

8. The wavelength conversion component according to claim 2, characterized in that: The first pit includes a plurality of adjacently arranged sub-pits. In a cross section of the first pit, the plurality of sub-pits are connected to each other from a center position of the first pit to an edge position of the first pit.

9. The wavelength conversion component according to claim 8, characterized in that: The shape of the first sub-pit is a hemispherical surface, a hemispherical surface or a spherical crown, and the shapes of the second sub-pit to the Nth sub-pit are fan-shaped rings.

10. The wavelength conversion component according to claim 2, characterized in that: The first thickness to the Nth thickness gradually decrease and present a Gaussian distribution.

11. The wavelength conversion component according to claim 3, characterized in that: The first volume proportion to the Nth volume proportion gradually decreases and presents a Gaussian distribution.

12. A light source device, characterized in that: include: A laser light source, used for emitting excitation light; A first lens group, used for emitting and focusing the excitation light emitted by the laser light source; The wavelength conversion component according to any one of claims 1 to 11, used to receive the excitation light emitted and collected by the first lens group, and to generate stimulated light based on the excitation light; The second lens group is arranged on the light-emitting side of the wavelength conversion component and is used for emitting the emitted light.

13. A lighting device, characterized in that: include: The light source device as claimed in claim 11; The housing forms a receiving space for receiving the light source device.

14. The lighting device according to claim 13, characterized in that: The housing is provided with a light blocking portion and an exit port in the exit direction of the exit light, the light blocking portion is used to block part of the exit light, and the exit port is used to exit part of the exit light.

15. The lighting device according to claim 14, characterized in that: Also includes: a light-transmitting sheet, which is arranged at the front end of the light-blocking portion and covers the emission port, so that part of the emission light sequentially passes through the emission port and the light-transmitting sheet; A light absorbing material layer, wherein the light absorbing material layer is coated on the edge area of ​​the light blocking portion and / or the edge area of ​​the light transmitting sheet, and is used for absorbing the outgoing light of the edge portion.

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