CN110887022A - Wavelength conversion device and light source system - Google Patents
Wavelength conversion device and light source system Download PDFInfo
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- CN110887022A CN110887022A CN201811049145.5A CN201811049145A CN110887022A CN 110887022 A CN110887022 A CN 110887022A CN 201811049145 A CN201811049145 A CN 201811049145A CN 110887022 A CN110887022 A CN 110887022A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
- F21V9/30—Elements containing photoluminescent material distinct from or spaced from the light source
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
- F21V9/40—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters with provision for controlling spectral properties, e.g. colour, or intensity
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/16—Cooling; Preventing overheating
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2033—LED or laser light sources
- G03B21/204—LED or laser light sources using secondary light emission, e.g. luminescence or fluorescence
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/50—Wavelength conversion elements
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Abstract
A wavelength conversion device comprises a wavelength conversion part and a non-wavelength conversion part, wherein the wavelength conversion part comprises a plurality of wavelength conversion modules, and each wavelength conversion module comprises a transparent heat conduction substrate, a wavelength conversion layer and a reflection layer which are sequentially arranged along the incident direction of exciting light. According to the invention, the structure of the wavelength conversion module is improved, so that the reflecting layer is arranged outside, and the heat dissipation of the wavelength conversion device can be optimized while the thickness of the reflecting layer is increased; each wavelength conversion module is independently packaged by different materials, so that the light efficiency of the wavelength conversion modules with different colors is fully improved, and the light emitting efficiency of the wavelength conversion device is improved.
Description
Technical Field
The invention relates to a wavelength conversion device and a light source system, and belongs to the technical field of illumination and display manufacturing.
Background
The fluorescent powder is excited by utilizing light sources such as laser or LED to obtain preset monochromatic light or polychromatic light, and the fluorescent powder is a technical scheme widely applied to the fields of lighting sources, projection display and the like. The technical scheme is that laser or LED emergent light is often incident on a fluorescent powder color wheel rotating at high speed so as to realize good heat dissipation.
The reflective color wheel in the prior art generally includes a substrate, a reflective layer and a light-emitting layer, which are sequentially stacked, wherein heat generated by the light-emitting layer due to laser or LED radiation is conducted to the substrate through the reflective layer, and then is dissipated to air through the substrate. Since the thermal conductivity of the reflective layer is low, the reflective layer cannot be designed to be too thick for heat dissipation. However, as the optical power is continuously increased, the requirement for the reflectivity of the reflective layer is gradually increased, increasing the thickness of the reflective layer is one of the effective ways to increase the reflectivity, and increasing the thickness of the reflective layer will increase the thermal resistance of the reflective layer, thereby reducing the heat dissipation performance.
Disclosure of Invention
The present invention provides a wavelength conversion device and a light source system with good reflectivity and heat dissipation performance, aiming at the defects of the prior art.
The technical problem to be solved by the invention is realized by the following technical scheme:
a wavelength conversion device is used for emitting excited light under the irradiation of exciting light and comprises a wavelength conversion part and a non-wavelength conversion part, wherein the wavelength conversion part comprises a plurality of wavelength conversion modules, and each wavelength conversion module comprises a transparent heat conduction substrate, a wavelength conversion layer and a reflection layer which are sequentially arranged along the incidence direction of the exciting light.
Preferably, the wavelength conversion part includes a first wavelength conversion module and a second wavelength conversion module, the first wavelength conversion module includes a first transparent heat conduction substrate, a first wavelength conversion layer and a first reflection layer that are sequentially arranged along the incident direction of the excitation light, and the second wavelength conversion module includes a second transparent heat conduction substrate, a second wavelength conversion layer and a second reflection layer that are sequentially arranged along the incident direction of the excitation light.
Preferably, the first wavelength conversion layer includes a first wavelength conversion material and an organic binder, the first reflective layer includes scattering particles and an organic binder, the second wavelength conversion layer includes a second wavelength conversion material and an inorganic binder, and the second reflective layer includes scattering particles and an inorganic binder.
Preferably, the excitation light incident surfaces of the first transparent heat conductive substrate and the second transparent heat conductive substrate are located on the same plane.
Preferably, the wavelength conversion part further includes a third wavelength conversion module, and the third wavelength conversion module includes a third transparent heat conduction substrate, a third wavelength conversion layer, and a third reflection layer, which are sequentially disposed along the excitation light incidence direction.
Preferably, the excitation light incident surfaces of the first, second, and third transparent heat conductive substrates are located on the same plane.
Preferably, the third wavelength conversion layer is a fluorescent ceramic layer, or the third wavelength conversion layer contains a third wavelength conversion material and an inorganic binder.
Preferably, the first wavelength conversion module further comprises a fluorescent ceramic layer disposed between the first transparent heat conductive substrate and the first wavelength conversion layer.
Preferably, the non-wavelength converting region includes a fourth transparent thermally conductive substrate and a fourth reflective layer, the fourth reflective layer being disposed on the excitation light incident surface of the fourth transparent thermally conductive substrate.
Preferably, a reflective layer is further disposed between the wavelength conversion layers of the adjacent wavelength conversion modules.
The invention also provides a light source system comprising the wavelength conversion device.
In summary, the structure of the wavelength conversion module is improved, so that the reflective layer is externally arranged, and the heat dissipation of the wavelength conversion device can be optimized while the thickness of the reflective layer is increased; each wavelength conversion module is independently packaged by different materials so as to fully improve the light efficiency of the wavelength conversion modules with different colors, thereby improving the light extraction efficiency of the wavelength conversion device; the excitation light incidence surfaces of the transparent heat conduction substrates of the different-color wavelength conversion modules are arranged on the same plane, so that the collection efficiency of the collection lenses in the light path is consistent.
The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Drawings
FIG. 1 is a schematic structural diagram of a wavelength conversion device according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view of a first wavelength conversion module according to one embodiment of the invention;
FIG. 3 is a cross-sectional view of a second wavelength conversion module according to one embodiment of the present invention;
FIG. 4 is a cross-sectional view of a third wavelength conversion module according to an embodiment of the present invention;
FIG. 5 is a cross-sectional view of a non-wavelength converting region according to an embodiment of the present invention;
FIG. 6 is a graph showing the relationship between the particle size and content of scattering particles and the reflectivity;
fig. 7 is a cross-sectional view of a third wavelength conversion module according to an embodiment of the present invention;
FIG. 8 is a flowchart illustrating a method for fabricating a wavelength conversion device according to an embodiment of the present invention;
fig. 9 is a cross-sectional view of a third wavelength conversion module according to an embodiment of the present invention.
[ description of reference ]
100 first wavelength conversion module
200 second wavelength conversion module
300 third wavelength conversion module
400 non-wavelength converting part
110 first wavelength conversion layer
120 first reflective layer
130 first transparent heat-conducting substrate
210 second wavelength converting layer
220 second reflective layer
230 second transparent heat-conducting substrate
310 third wavelength conversion layer
320 third reflective layer
330 third transparent heat-conducting substrate
420 fourth reflective layer
430 fourth transparent heat-conducting substrate
310' yellow fluorescent ceramic
320' third surrounding reflective layer
Detailed Description
Example one
The invention provides a wavelength conversion device for emitting stimulated light under irradiation of exciting light, which comprises a wavelength conversion part and a non-wavelength conversion part.
The wavelength conversion part comprises a plurality of wavelength conversion modules, each wavelength conversion module is in a fan ring shape, each wavelength conversion module comprises a transparent heat conduction substrate, a wavelength conversion layer and a reflection layer which are sequentially arranged along the incidence direction of the exciting light, and the color of the wavelength conversion layer can be red, yellow, green, orange, cyan and the like. Specifically, when the wavelength conversion part comprises a first wavelength conversion module and a second wavelength conversion module, the first wavelength conversion module comprises a first transparent heat conduction substrate, a first wavelength conversion layer and a first reflection layer which are sequentially arranged along the incident direction of the exciting light, and the second wavelength conversion module comprises a second transparent heat conduction substrate, a second wavelength conversion layer and a second reflection layer which are sequentially arranged along the incident direction of the exciting light; when the wavelength conversion part further comprises a third wavelength conversion module, the third wavelength conversion module comprises a third transparent heat conduction substrate, a third wavelength conversion layer and a third reflection layer which are sequentially arranged along the incident direction of the exciting light. The number of wavelength conversion modules is not limited by the present invention, and those skilled in the art can design the wavelength conversion modules according to actual needs.
According to the invention, the reflecting layer is not positioned between the wavelength conversion layer and the transparent heat conduction substrate, so that the heat transfer between the wavelength conversion layer and the transparent heat conduction substrate is not influenced, therefore, the thickness of the reflecting layer can be increased, and the reflecting layer has excellent reflectivity. Meanwhile, the heat generated when the wavelength conversion layer is excited is directly conducted to the transparent heat conduction substrate, and then the transparent heat conduction substrate exchanges heat with air, so that the heat dissipation efficiency is obviously improved.
The wavelength conversion device of the present embodiment will be further described with reference to the drawings.
FIG. 1 is a schematic structural diagram of a wavelength conversion device according to an embodiment of the present invention; FIG. 2 is a cross-sectional view of a first wavelength conversion module according to one embodiment of the invention; FIG. 3 is a cross-sectional view of a second wavelength conversion module according to one embodiment of the present invention; FIG. 4 is a cross-sectional view of a third wavelength conversion module according to an embodiment of the present invention; FIG. 5 is a cross-sectional view of a non-wavelength converting region according to an embodiment of the present invention. As shown in fig. 1 to 5, in the present embodiment, the wavelength conversion device includes a wavelength converting region and a non-wavelength converting region 400. The wavelength conversion part includes a first wavelength conversion module 100, a second wavelength conversion module 200, and a third wavelength conversion module 300. The first wavelength conversion module 100, the second wavelength conversion module 200, and the third wavelength conversion module 300 are sequentially disposed along an incident direction of the excitation light (as indicated by arrows in the figure), and include a transparent heat conductive substrate, a wavelength conversion layer, and a reflective layer. The non-wavelength converting region 400 includes a fourth transparent thermally conductive substrate 430 and a fourth reflective layer 420. The wavelength conversion layer includes a wavelength conversion material and a binder, and the reflective layer includes scattering particles and a binder. The binder is an inorganic binder or an organic binder, the inorganic binder may be an inorganic binder such as glass, and the organic binder may be an organic binder such as silica gel, which is not limited in the present invention.
In this embodiment, the first wavelength conversion module 100 is configured to convert the excitation light into red stimulated light, the second wavelength conversion module 200 is configured to convert the excitation light into green stimulated light, and the third wavelength conversion module is configured to convert the excitation light into yellow stimulated light. Specifically, the first wavelength conversion layer 110 of the first wavelength conversion module 100 includes a first wavelength conversion material (red phosphor) and an organic binder, and the first reflective layer 120 includes scattering particles and an organic binder; the second wavelength conversion layer 210 of the second wavelength conversion module 200 includes a second wavelength conversion material (green phosphor) and an inorganic binder, and the second reflective layer 220 includes scattering particles and an inorganic binder; the third wavelength conversion layer 310 of the third wavelength conversion module 300 includes a third wavelength conversion material (yellow phosphor) and an inorganic binder, and the third reflective layer 320 includes scattering particles and an inorganic binder.
As can be seen from fig. 2 to 4, in the wavelength conversion module, the reflective layer is not located between the wavelength conversion layer and the transparent heat conductive substrate, and thus even if the thickness of the reflective layer is increased, the heat transfer between the wavelength conversion layer and the transparent heat conductive substrate is not affected, so that the thickness of the reflective layer in the present invention can be increased, thereby enabling the reflective layer to have excellent reflectivity. Meanwhile, the heat generated when the wavelength conversion layer is excited is directly conducted to the transparent heat conduction substrate, and then the transparent heat conduction substrate exchanges heat with air, so that the heat dissipation efficiency is obviously improved.
Further, the wavelength conversion material and the binder of the plurality of wavelength conversion module wavelength conversion layers in the present invention may be selected according to the color of the wavelength conversion module.
In this embodiment, the first wavelength conversion layer 110 of the first wavelength conversion module 100 contains a red wavelength conversion material, and the red wavelength conversion material cannot be packaged into a luminescent inorganic adhesive or a luminescent ceramic because of the bottleneck limit of the red wavelength conversion material itself.
The second wavelength conversion layer 210 of the second wavelength conversion module 200 contains a green wavelength conversion material, and the wavelength conversion layer composed of green phosphor and inorganic binder has high luminous efficiency, so in this embodiment, the second wavelength conversion layer of the second wavelength conversion module contains the second wavelength conversion material (such as green phosphor) and inorganic binder.
The third wavelength conversion layer of the third wavelength conversion module 300 contains a yellow wavelength conversion material, and the wavelength conversion layer composed of a yellow phosphor and an inorganic binder has high luminous efficiency, so in this embodiment, the wavelength conversion layer of the third wavelength conversion module contains the third wavelength conversion material (yellow phosphor) and the inorganic binder.
The reflective layer contains scattering particles and an organic binder or an inorganic binder for binding the scattering particles. The scattering particles are made of one or more powder materials such as zirconia, magnesia, alumina, titania, calcium oxide and the like.
The relative scattering power of the scattering particles in the reflective layer for different colors of light varies in size, and the relative scattering power of the scattering particles in the reflective layer composition for blue, green, and red light is a function of particle size. For example, when the particle diameter of the scattering particles is 0.2 μm, the sum of the relative scattering forces for light of the respective wavelengths is maximum; when the particle size of the scattering particles is increased to between 0.25 μm and 0.30 μm, the relative scattering power for blue excitation light is rapidly reduced, but the relative scattering power for green and red excitation light is relatively unchanged; when the particle diameter of the scattering particles is reduced to 0.15 μm, the relative scattering power for blue excitation light is maximized, while the relative scattering power for green and red excitation light is significantly reduced. In addition, the content of the scattering particles in the reflective layer has different relative scattering forces for different colors of light. Therefore, in the present invention, the particle size and the content of the scattering particles in the reflective layer may be different for wavelength conversion modules of different colors.
In this embodiment, the particle size of the scattering particles in the third reflective layer of the third wavelength conversion module is 0.25 μm to 0.3 μm, and the content of the scattering particles is 40 wt% to 60 wt%; the particle size of scattering particles in the first reflecting layer of the first wavelength conversion module is 0.25-0.35 μm, and the content of the scattering particles is 40-80 wt%; the particle size of scattering particles in the second reflecting layer of the second wavelength conversion module is 0.25-0.3 μm, and the content of the scattering particles is 40-60 wt%; the particle diameter of the scattering particles in the reflective layer of the non-wavelength conversion part is 0.1-0.2 μm, and the content of the scattering particles is 30-50 wt%.
Fig. 6 is a graph showing the relationship between the particle size and content of the scattering particles and the reflectance. As shown in fig. 6, FS01 is a reflectance curve of a normal reflective layer, FS02 is a reflectance curve of the second reflective layer and the third reflective layer in the present invention, and FS03 is a reflectance curve of the first reflective layer in the present invention. As can be seen from the figure, the first reflective layer has a high reflectance for red light, and the second and third reflective layers have high reflectances for green and yellow light. Compared with the same reflecting layer, the light with different wavelengths can be reflected by the wavelength conversion device with higher reflectivity by selecting the reflecting layer suitable for the light with different wavelengths, so that the light efficiency of each wavelength conversion layer is improved.
When an organic adhesive or an inorganic adhesive for bonding scattering particles is used, the amount of power of the excitation light can be adjusted, and if the power is large, the inorganic adhesive is preferable. When the binder of the wavelength conversion layer is an organic binder, the reflective layer preferably binds the scattering particles with the organic binder; when an inorganic adhesive is used as the binder of the wavelength conversion layer, the scattering particles are preferably bound to the reflective layer by the inorganic adhesive.
Because each wavelength conversion module can adopt the best material and process to realize the best performance according to the technical requirement characteristics, the reflecting layer can select the raw materials and the particle diameter range suitable for the color section according to the wavelength attribute of the emergent light of each wavelength conversion layer, and the raw materials and the particle diameter range are flexibly combined and spliced to fully improve the light efficiency of each wavelength conversion layer, thereby improving the light-emitting efficiency of the whole wavelength conversion device.
In order to ensure that the emitting light surfaces are on the same plane and the collecting efficiency at the collecting lens in the light path is consistent, the excitation light incident surfaces of the transparent heat conducting substrates of the plurality of wavelength conversion modules are located on the same plane. At this time, since the excitation light incident surface of the transparent heat conductive substrate of the wavelength conversion part is a plane, it is both the excitation light incident surface and the light emitting surface, that is, the first transparent heat conductive substrate of the first wavelength conversion module 100, the second transparent heat conductive substrate of the second wavelength conversion module 200, and the third transparent heat conductive substrate 330 of the third wavelength conversion module 300, which face away from the wavelength conversion layer, are the same plane.
In addition, the reflective layer in the fourth wavelength conversion module 400 may be disposed on the light incident surface (surface on which the excitation light is incident) of the fourth transparent heat conductive substrate 430, or may be disposed on a surface away from the light incident surface of the fourth transparent heat conductive substrate 430, preferably on the light incident surface, that is, the fourth reflective layer and the fourth transparent heat conductive substrate are sequentially disposed along the direction of incidence of the excitation light. The excitation light directly enters the fourth wavelength conversion module 400 from the air to be reflected when the excitation light is arranged on the light incident surface, the reflected light directly enters the air, and the reflected light does not pass through the fourth transparent substrate and then enters the air, so that the loss of the reflected light is reduced. If the light reflected by the fourth wavelength conversion module 400 is not vertically incident on the fourth transparent heat conducting substrate 430 but is angularly incident due to diffuse reflection on the back surface (the surface far away from the light incident surface), since the fourth reflective layer 420 and the fourth transparent heat conducting substrate are different media, the light is refracted when entering the fourth transparent heat conducting substrate 430 from the fourth reflective layer 420, and a part of the light at an angle cannot exit from the light incident surface of the fourth transparent heat conducting substrate 430.
In order to improve the reflection efficiency of the wavelength conversion modules with different colors of the wavelength conversion part and avoid mutual interference among a plurality of wavelength conversion modules with different colors, a reflection layer can be arranged between the wavelength conversion layers of the adjacent wavelength conversion modules. Fig. 7 is a cross-sectional view of a third wavelength conversion module according to an embodiment of the present invention after improvement. As shown in fig. 7, the side of the third wavelength conversion layer 310 of the third wavelength conversion module is wrapped by a third surrounding reflective layer 320'.
Fig. 8 is a flowchart of a method for manufacturing a wavelength conversion device according to an embodiment of the present invention, and as shown in fig. 8, in combination with the above description, the method for manufacturing a wavelength conversion device according to the embodiment includes:
s101, providing a first transparent heat conducting substrate, a second transparent heat conducting substrate, a third transparent heat conducting substrate and a fourth transparent heat conducting substrate.
S103, printing a first luminescent slurry layer on one surface of the first transparent heat-conducting substrate, and pre-baking and surface-drying the first luminescent slurry layer.
And S105, printing a first reflection slurry layer on the surface of the first luminescence slurry layer, and drying the first reflection slurry layer to form the first wavelength conversion module.
And S107, printing a second luminescent slurry layer on one surface of the second transparent heat-conducting substrate, and drying the second slurry layer.
And S109, printing a second reflection slurry layer on the surface of the second light-emitting slurry layer, and drying the second reflection slurry layer to form a second wavelength conversion module.
And S111, printing a third luminescent slurry layer on one surface of the third transparent heat-conducting substrate, and drying the third slurry layer.
And S113, printing a third reflection slurry layer on the surface of the third light-emitting slurry layer, and drying the third reflection slurry layer to form a third wavelength conversion module.
And S115, printing a fourth reflecting slurry layer on one surface of the fourth transparent heat-conducting substrate, and drying the fourth reflecting slurry layer to form the non-wavelength conversion part.
And S117, gluing the first transparent heat-conducting substrate, the second transparent heat-conducting substrate, the third transparent heat-conducting substrate and the fourth transparent heat-conducting substrate.
It is understood that the method for manufacturing the wavelength conversion device of the present invention does not necessarily have to be strictly in accordance with the above-mentioned order, and the above-mentioned steps may be performed in a regulated order or simultaneously.
Specifically, in the step of manufacturing the first wavelength conversion module, the first luminescent paste layer contains an organic binder and a first wavelength conversion material (red phosphor), and the first reflective paste layer contains an organic binder and scattering particles. Because the red fluorescent powder is not heat-resistant, a pre-drying mode is needed.
Further, after the first reflective slurry layer is dried, a red light color-modifying coating layer can be further formed on the surface, far away from the first wavelength conversion layer, of the first transparent heat-conducting substrate by vacuum evaporation or magnetron sputtering. The red light color-modifying coating layer has the functions of transmitting small-angle blue light (the incident angle is less than 17 degrees and the wavelength is 420nm-460 nm) and larger-angle red light (the wavelength is 580nm-700nm) and reflecting light in other wave bands.
In the step of fabricating the second wavelength conversion module, the second luminescent paste layer includes an inorganic binder and a second wavelength conversion material (green phosphor), and the second reflective paste layer includes an inorganic binder and scattering particles.
Further, after the second reflective slurry layer is dried, a green light color-modifying coating layer can be further coated on one surface of the second transparent heat-conducting substrate far away from the second wavelength conversion layer by vacuum evaporation or magnetron sputtering. The green light color-modifying coating layer has the functions of transmitting small-angle blue-green light (the incident angle is less than 17 degrees, and the wavelength is 420nm-560 nm), and reflecting light in other wave bands.
In the step of fabricating the third wavelength conversion module, the third luminescent paste layer contains an inorganic binder and a third wavelength conversion material (yellow phosphor), and the third reflective paste layer contains an inorganic binder and scattering particles.
Further, after the third reflective slurry layer is dried, a yellow light-modifying coating layer may be further deposited on the surface of the third transparent heat conducting substrate 330 away from the third wavelength conversion layer 310 by vacuum evaporation or magnetron sputtering. The yellow light color-modifying coating layer has the functions of transmitting small-angle blue light (the incident angle is less than 17 degrees, and the wavelength is 420nm-460 nm) and larger-angle yellow light (the wavelength is 520nm-580nm), and reflecting other wave band light.
The fourth reflective paste layer contains an inorganic binder and scattering particles.
Because the color correction coating layer is directly plated on the transparent heat conducting substrate, the size miniaturization of the wavelength conversion device can be realized, the load capacity of the motor is reduced, and the packaging process difficulty is reduced. In other words, the transparent heat-conducting substrate provided with the color-modifying coating layer has the functions of heat sink heat conduction, a supporting substrate and a color-modifying membrane.
Example two
This embodiment is different from the first embodiment in that the wavelength conversion layer of the third wavelength conversion module employs a yellow fluorescent ceramic. Due to the current YAG: ce3+The yellow fluorescent ceramic has a mature preparation process, the luminous efficiency of the yellow fluorescent ceramic is superior to the combination of an inorganic adhesive and yellow fluorescent powder, and the yellow fluorescent ceramic has great advantages in the aspects of heat resistance, heat conductivity and reliability.
In this embodiment, the improved third wavelength conversion module is manufactured by the following steps:
printing a third reflection slurry layer on the non-polished surface of the single-side polished yellow fluorescent ceramic, and drying the third reflection slurry layer;
and a yellow light shading coating layer is plated on one surface of the third transparent heat-conducting substrate by vacuum evaporation or magnetron sputtering. The yellow light color-modifying coating layer has the functions of transmitting small-angle blue light (the incident angle is less than 17 degrees, and the wavelength is 420nm-460 nm) and larger-angle yellow light (the wavelength is 520nm-580nm), and reflecting other wave band light.
And coating colorless transparent optical glue on the surface, without the film, of the third transparent heat-conducting substrate and the polished surface of the yellow fluorescent ceramic, and then attaching and drying the surfaces, wherein the thickness of the optical glue is within 10 microns.
Other structures in this embodiment are the same as those in the first embodiment, and are not described herein again.
EXAMPLE III
The present embodiment is different from the first embodiment in the structure of the first wavelength conversion module.
Fig. 9 is a cross-sectional view of a third wavelength conversion module according to an embodiment of the present invention. Since the red phosphor has poor heat resistance, in order to improve the heat resistance of the first wavelength conversion module, as shown in fig. 9, in this embodiment, a fluorescent ceramic layer (yellow fluorescent ceramic 310 ') is further disposed between the first wavelength conversion layer 110 and the first transparent heat conducting substrate 130 of the first wavelength conversion module, that is, in this embodiment, the first wavelength conversion module includes the first transparent heat conducting substrate 130, the yellow fluorescent ceramic 310', the first wavelength conversion layer 110, and the first reflective layer 120, which are sequentially disposed along the incident direction of the excitation light.
The packaging process of the first wavelength conversion module comprises the following steps:
a first luminescent slurry layer is formed on the non-polished surface of the yellow fluorescent ceramic with a polished single surface, and the first luminescent slurry layer is pre-baked and surface-dried;
printing a first reflection slurry layer on the surface of the first luminescence slurry layer, and drying the first reflection slurry layer;
and a red light color-modifying coating layer is plated on one surface of the first transparent heat-conducting substrate by vacuum evaporation or magnetron sputtering. The red light color-modifying coating layer has the functions of transmitting small-angle blue light (the incident angle is less than 17 degrees and the wavelength is 420nm-460 nm) and larger-angle red light (the wavelength is 580nm-700nm) and reflecting light in other wave bands;
and coating colorless and transparent optical glue on the surface, without the film, of the first transparent heat-conducting substrate and the polished surface of the yellow fluorescent ceramic, and then attaching and drying the first transparent heat-conducting substrate and the polished surface of the yellow fluorescent ceramic, wherein the thickness of the optical glue is within 10 mu m.
Other structures in this embodiment are the same as those in the embodiment, and are not described herein again.
The embodiment of the present invention further provides a light source system, which includes a wavelength conversion device, where the wavelength conversion device may have the structure and the function in the above embodiments, and the light source system may be applied to a projection apparatus.
In summary, the structure of the wavelength conversion module is improved, so that the reflective layer is externally arranged, and the heat dissipation of the wavelength conversion device can be optimized while the thickness of the reflective layer is increased; each wavelength conversion module is independently packaged by different materials so as to fully improve the light efficiency of the wavelength conversion modules with different colors, thereby improving the light extraction efficiency of the wavelength conversion device; the excitation light incidence surfaces of the transparent heat conduction substrates of the different-color wavelength conversion modules are arranged on the same plane, so that the collection efficiency of the collection lenses in the light path is consistent.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (12)
1. A wavelength conversion device is used for emitting excited light under the irradiation of exciting light, and is characterized by comprising a wavelength conversion part and a non-wavelength conversion part, wherein the wavelength conversion part comprises a plurality of wavelength conversion modules, and each wavelength conversion module comprises a transparent heat conduction substrate, a wavelength conversion layer and a reflection layer which are sequentially arranged along the incidence direction of the exciting light.
2. The wavelength conversion device according to claim 1, wherein the wavelength conversion portion includes a first wavelength conversion module and a second wavelength conversion module, the first wavelength conversion module includes a first transparent heat conductive substrate, a first wavelength conversion layer, and a first reflection layer that are sequentially arranged in an incident direction of the excitation light, and the second wavelength conversion module includes a second transparent heat conductive substrate, a second wavelength conversion layer, and a second reflection layer that are sequentially arranged in the incident direction of the excitation light.
3. The wavelength conversion device according to claim 2, wherein the first wavelength conversion layer contains a first wavelength conversion material and an organic binder, the first reflective layer contains scattering particles and an organic binder, the second wavelength conversion layer contains a second wavelength conversion material and an inorganic binder, and the second reflective layer contains scattering particles and an inorganic binder.
4. The wavelength conversion device according to claim 2, wherein the excitation light incident surfaces of the first transparent thermally conductive substrate and the second transparent thermally conductive substrate are located on the same plane.
5. The wavelength conversion device according to claim 2, wherein the wavelength conversion portion further comprises a third wavelength conversion module comprising a third transparent heat conductive substrate, a third wavelength conversion layer, and a third reflection layer disposed in this order along the incident direction of the excitation light.
6. The wavelength conversion device according to claim 5, wherein the excitation light incident surfaces of the first, second, and third transparent heat conductive substrates are located on the same plane.
7. The wavelength conversion device according to claim 5, wherein the third wavelength conversion layer is a fluorescent ceramic layer, or wherein the third wavelength conversion layer contains a third wavelength conversion material and an inorganic binder.
8. The wavelength conversion device of claim 2, wherein the first wavelength conversion module further comprises a fluorescent ceramic layer disposed between the first transparent thermally conductive substrate and the first wavelength conversion layer.
9. The wavelength conversion device according to claim 2, wherein the non-wavelength converting region comprises a fourth transparent thermally conductive substrate and a fourth reflective layer.
10. The wavelength conversion device according to claim 9, wherein the fourth reflective layer is disposed on an excitation light incident surface of the fourth transparent thermally conductive substrate.
11. The wavelength conversion device according to claim 1, wherein a reflective layer is further provided between the wavelength conversion layers of the adjacent wavelength conversion modules.
12. A light source system comprising a wavelength conversion device according to any one of claims 1 to 11.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811049145.5A CN110887022A (en) | 2018-09-10 | 2018-09-10 | Wavelength conversion device and light source system |
| PCT/CN2019/081650 WO2020052228A1 (en) | 2018-09-10 | 2019-04-08 | Wavelength conversion device and light source system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811049145.5A CN110887022A (en) | 2018-09-10 | 2018-09-10 | Wavelength conversion device and light source system |
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| CN110887022A true CN110887022A (en) | 2020-03-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811049145.5A Pending CN110887022A (en) | 2018-09-10 | 2018-09-10 | Wavelength conversion device and light source system |
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| Country | Link |
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| CN (1) | CN110887022A (en) |
| WO (1) | WO2020052228A1 (en) |
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