Wavelength conversion element, projection device and manufacturing method of wavelength conversion element

Abstract

The invention provides a wavelength conversion element which comprises a substrate and a wavelength conversion material, the wavelength conversion material is configured on the substrate, and the wavelength conversion material is used for converting an excitation light beam into a conversion light beam. The wavelength conversion material comprises fluorescent glass and a second fluorescent material. The fluorescent glass comprises a glass material and a first fluorescent material. The fluorescent glass covers the second fluorescent material, and the first fluorescent material is different from the second fluorescent material. According to the wavelength conversion element, the projection device and the manufacturing method of the wavelength conversion element, the light emitting efficiency of the wavelength conversion element can be improved, and the effect of adjusting the color point of the light beam can be achieved through different fluorescent materials.

Description

Technical Field

[0001] The present invention relates to an optical element, an electronic device and a method for manufacturing the optical element, and in particular to a wavelength conversion element, a projection device and a method for manufacturing the wavelength conversion element. Background Art

[0002] The projection device is a display device used to produce large-size images. With the evolution and innovation of science and technology, it has been continuously improving. The imaging principle of the projection device is to convert the illumination beam generated by the illumination system into an image beam through a light valve, and then project the image beam onto the projection target (such as a screen or a wall) through a projection lens to form a projection image. In addition, the illumination system uses an excitation beam to excite the fluorescent layer on the fluorescent color wheel to obtain beams of different colors. Generally speaking, the fluorescent layer is made of glass as a material, and is formed by mixing crushed glass powder with fluorescent powder and sintering together. Among them, the excitation beam incident on the fluorescent color wheel excites the fluorescent powder to obtain fluorescence, and the wavelength of the fluorescence depends on the added fluorescent powder. However, glass only acts as a binder in the fluorescent layer and cannot be excited to produce fluorescence. In other words, the luminous efficiency and fluorescence wavelength of the fluorescent color wheel are only limited by the fluorescent powder itself, and the glass does not have the function of luminescence.

[0003] The "background technology" section is only used to help understand the content of the present invention. Therefore, the content disclosed in the "background technology" section may contain some prior art that is not known to those skilled in the art. The content disclosed in the "background technology" section does not mean that the content or the problem to be solved by one or more embodiments of the present invention has been known or recognized by those skilled in the art before the application of the present invention. Summary of the invention

[0004] The present invention provides a wavelength conversion element, a projection device and a method for manufacturing the wavelength conversion element, which can improve the luminous efficiency and also achieve the effect of adjusting the color point of the light beam by using different fluorescent materials.

[0005] Other purposes and advantages of the present invention can be further understood from the technical features disclosed in the present invention.

[0006] To achieve one or part or all of the above objectives or other objectives, the present invention provides a wavelength conversion element, which includes a substrate and a wavelength conversion material, wherein the wavelength conversion material is disposed on the substrate, and the wavelength conversion material is used to convert an excitation light beam into a conversion light beam. The wavelength conversion material includes fluorescent glass and a second fluorescent material. The fluorescent glass includes a glass material and a first fluorescent material. The fluorescent glass covers the second fluorescent material, and the first fluorescent material is different from the second fluorescent material.

[0007] To achieve one or part or all of the above purposes or other purposes, the present invention provides a projection device, which includes an illumination system, a light valve and a projection lens. The illumination system is used to provide an illumination beam, and the illumination system includes a light source module and a wavelength conversion element. The light source module is used to provide an excitation beam. The wavelength conversion element is configured on the transmission path of the excitation beam. The wavelength conversion element includes a substrate and a wavelength conversion material, wherein the wavelength conversion material is configured on the substrate, and the wavelength conversion material is used to convert the excitation beam into a conversion beam. The wavelength conversion material includes fluorescent glass and a second fluorescent material. The fluorescent glass includes a glass material and a first fluorescent material. The fluorescent glass covers the second fluorescent material, and the first fluorescent material is different from the second fluorescent material. The illumination beam includes at least one of the excitation beam and the conversion beam. The light valve is configured on the transmission path of the illumination beam to convert the illumination beam into an image beam. The projection lens is configured on the transmission path of the image beam to project the image beam out of the projection device.

[0008] To achieve one or part or all of the above purposes or other purposes, the present invention provides a method for manufacturing a wavelength conversion element, which includes the steps of mixing a glass material and a first fluorescent material to form a fluorescent glass body raw material; a step of making fluorescent glass using the fluorescent glass body raw material; a step of mixing a second fluorescent material and the fluorescent glass and sintering to form a wavelength conversion material, wherein the first fluorescent material and the second fluorescent material are different; and a step of configuring the wavelength conversion material to a substrate to form a wavelength conversion element.

[0009] Based on the above, the embodiments of the present invention have at least one of the following advantages or effects. In the wavelength conversion element, projection device and wavelength conversion element manufacturing method of the present invention, the wavelength conversion element includes a substrate and a wavelength conversion material, and the wavelength conversion element is configured on the transmission path of the excitation light beam. Among them, the wavelength conversion material includes fluorescent glass and a second fluorescent material, and the fluorescent glass includes a glass material and a first fluorescent material. Among them, the first fluorescent material is different from the second fluorescent material. In this way, the wavelength conversion material can achieve the effect of composite luminescence, improve the luminous efficiency of the wavelength conversion material, and also can achieve the effect of adjusting the color point of the light beam by the wavelength difference of the light beam generated by the excitation of two different fluorescent materials.

[0010] In order to make the above features and advantages of the present invention more clearly understood, embodiments are given below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 FIG. 4 is a schematic diagram of a projection device according to an embodiment of the present invention.

[0012] Figure 2 FIG. 4 is a schematic diagram of a wavelength conversion element according to an embodiment of the present invention.

[0013] Figure 3 for Figure 2 A schematic partial cross-sectional view of a wavelength conversion element.

[0014] FIG. 4A to FIG. 4C Schematic diagrams of spectra of fluorescent glasses according to different embodiments of the present invention.

[0015] Figure 5A and Figure 5B Schematic diagrams of spectra of the second fluorescent material according to different embodiments of the present invention.

[0016] Figure 6 FIG. 4 is a schematic diagram of a spectrum of a wavelength conversion material according to an embodiment of the present invention.

[0017] Figure 7 The present invention is a flowchart of a method for manufacturing a wavelength conversion element according to an embodiment of the present invention.

[0018] Reference numerals list

[0019] 10: Projection device

[0020] 50: Lighting system

[0021] 52: Light source module

[0022] 60: Light valve

[0023] 70: Projection device

[0024] 100: Wavelength conversion element

[0025] 110:Substrate

[0026] 112: Wavelength conversion area

[0027] 114: Non-wavelength conversion area

[0028] 120: Wavelength conversion material

[0029] 210: Fluorescent glass

[0030] 212: Glass material

[0031] 214: first fluorescent material

[0032] 220: Second fluorescent material

[0033] L1: Excitation beam

[0034] L2: Transformation beam

[0035] L21: First beam

[0036] L22: Second beam

[0037] LB: Lighting beam

[0038] LI: Image beam. DETAILED DESCRIPTION

[0039] The above and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the drawings. The directional terms (e.g., up, down, left, right, front or back, etc.) mentioned in the following embodiments are only referenced to the directions of the attached drawings. Therefore, the directional terms used are used to illustrate and not to limit the present invention.

[0040] Figure 1 This is a schematic diagram of a projection device according to an embodiment of the present invention. Figure 1 The present embodiment provides a projection device (projector) 10, which includes an illumination system 50, a light valve 60, and a projection lens 70. The illumination system 50 is used to provide an illumination beam LB. The light valve 60 is disposed on the transmission path of the illumination beam LB, and is used to convert the illumination beam LB into an image beam LI. The projection lens 70 is disposed on the transmission path of the image beam LI, and is used to project the image beam LI out of the projection device 10 to a projection target (not shown), such as a screen or a wall.

[0041] The illumination system 50 is used to provide an illumination beam LB. For example, in the present embodiment, the illumination system 50 is composed of a light source module 52, a wavelength conversion element 100, a light homogenizing element, a filter element, and a plurality of light splitting and combining elements, and is used to provide light with different wavelengths as the source of the illumination beam LB. The light source module 52 is composed of a plurality of light emitting elements, and is used to provide an excitation beam L1. The light emitting element is, for example, a light emitting diode (LED) or a laser diode (LD). The wavelength conversion element 100 is, for example, a fluorescent color wheel, which is arranged on the transmission path of the excitation beam L1, and is used to convert the excitation beam L1 into a conversion beam L2. The conversion beam L2 is, for example, fluorescent light. The illumination beam LB includes at least one of the excitation beam L1 and the conversion beam L2. However, the present invention does not limit the type or form of the illumination system 50 in the projection device 10, and its detailed structure and implementation method can obtain sufficient teachings, suggestions and implementation instructions from the common knowledge in the relevant field, so it is not repeated.

[0042] The light valve 60 is, for example, a reflective light modulator such as a Liquid Crystal On Silicon panel (LCoS panel) or a Digital Micro-mirror Device (DMD). In some embodiments, the light valve 60 may also be a transmissive light modulator such as a Transparent Liquid Crystal Panel, an Electro-Optical Modulator, a Magneto-Optic modulator, or an Acousto-Optic Modulator (AOM). The present invention does not limit the type and kind of the light valve 60. The detailed steps and implementation methods of the method of converting the illumination light beam LB into the image light beam LI by the light valve 60 can be obtained from the common knowledge in the relevant field, and therefore will not be repeated. In the present embodiment, the number of the light valve 60 is one, for example, a projection device 10 using a single digital micromirror device, but in other embodiments, there may be multiple light valves, and the present invention is not limited thereto.

[0043] The projection lens 70 includes, for example, a combination of one or more optical lenses with refractive power, such as various combinations of non-planar lenses such as biconcave lenses, biconvex lenses, concave-convex lenses, convex-concave lenses, plano-convex lenses, and plano-concave lenses. In one embodiment, the projection lens 70 may also include a planar optical lens that projects the image beam LI from the light valve 60 to the projection target in a reflective manner. The present invention does not limit the type and kind of the projection lens 70.

[0044] Figure 2 FIG. 4 is a schematic diagram of a wavelength conversion element according to an embodiment of the present invention. Figure 3 for Figure 2 A partial cross-sectional diagram of the wavelength conversion element. Please refer to Figures 1 to 3 . Figure 2 The wavelength conversion element 100 shown can be applied to at least Figure 1The projection device 10 shown in FIG. 1 is a projection device 10. The wavelength conversion element 100 includes a substrate 110 and a wavelength conversion material 120. The wavelength conversion material 120 is disposed on the substrate 110 to convert the excitation light beam L1 into a conversion light beam L2. The substrate 110 may be a reflective substrate or a light-transmitting substrate. The surface of the substrate 110 may be designed as a surface with a reflective property or a light-transmitting surface. Specifically, the substrate 110 has a wavelength conversion region 112 and a non-wavelength conversion region 114. The wavelength conversion material 120 is disposed in the wavelength conversion region 112. The non-wavelength conversion region 114 may be configured with a reflector or a light-transmitting optical element. The light-transmitting optical element may be, for example, a light-transmitting plate or glass. The wavelength conversion material 120 may be, for example, a phosphor in glass (PIG) ​​sintered body, which includes a fluorescent glass 210 and a second fluorescent material 220. In other embodiments, the wavelength conversion element 100 may further include a reflective layer disposed between the wavelength conversion material 120 and the substrate 110.

[0045] In detail, the fluorescent glass 210 includes a glass material 212 and a first fluorescent material 214, and the fluorescent glass 210 covers a second fluorescent material 220. The first fluorescent material 214 is different from the second fluorescent material 220. In other words, the wavelength conversion material 120 of this embodiment is made by mixing the first fluorescent material 214 with the glass material 212 to form the fluorescent glass 210, and the fluorescent glass 210 and the second fluorescent material 220 are sintered to form a fluorescent glass sintered body (wavelength conversion material 120). Therefore, the converted light beam L2 generated by the wavelength conversion material 120 has multiple different wavelength peaks. In this way, the wavelength conversion material 120 can achieve the effect of composite luminescence. The fluorescent glass 210 with a larger volume not only acts as a binder but also has a luminescence function. In this way, the luminescence efficiency of the wavelength conversion material 120 can be improved, and the color point of the light beam can be adjusted by the wavelength difference of the light beam generated by exciting two different fluorescent materials.

[0046] In this embodiment, the weight percentage concentration of the first fluorescent material 214 in the wavelength conversion material 120 is less than or equal to 10%, which has a better optical effect. In a preferred embodiment, the weight percentage concentration of the first fluorescent material 214 in the wavelength conversion material 120 is between 4% and 7%. In a more preferred embodiment, the weight percentage concentration of the first fluorescent material 214 in the wavelength conversion material 120 is between 5% and 6%. Further, the weight percentage concentration of the first fluorescent material 214 in the fluorescent glass 210 is less than or equal to 10%, which has a better optical effect. In addition, the weight percentage concentration of the second fluorescent material 220 in the wavelength conversion material 120 is between 30% and 60%, which has a better optical effect. In a preferred embodiment, the weight percentage concentration of the second fluorescent material 220 in the wavelength conversion material 120 is between 40% and 50%. The weight percentage concentration of the fluorescent glass 210 in the wavelength conversion material 120 is between 40% and 70%, which has a better optical effect. In a preferred embodiment, the weight percentage concentration of the fluorescent glass 210 in the wavelength conversion material 120 is between 50% and 60%. In addition, the thickness of the wavelength conversion material 120 is between 0.05 mm and 0.5 mm, which has a better optical effect.

[0047] FIG. 4A to FIG. 4C Schematic diagrams of spectra of fluorescent glasses according to different embodiments of the present invention. Figure 5A and Figure 5B Schematic diagrams of spectra of the second fluorescent material according to different embodiments of the present invention. Figure 6 This is a schematic diagram of the spectrum of a wavelength conversion material according to an embodiment of the present invention. Figures 3 to 6 . In detail, the fluorescent glass 210 containing the first fluorescent material 214 is used to convert the excitation light beam L1 into the first light beam L21, and the second fluorescent material 220 is used to convert the excitation light beam L1 into the second light beam L22. The wavelength peak of the first light beam L21 is different from the wavelength peak of the second light beam L22, and the converted light beam L2 includes at least one of the first light beam L21 and the second light beam L22. The glass material 212 includes, for example, silicate, borate, aluminate, phosphate, alkali metals, alkaline earth metals, zinc oxide, or any combination thereof. Among them, the use of alkaline earth metals, alkali metals, or zinc oxide can be used to modify the properties of the glass to reduce the sintering temperature or working temperature of the glass. The first fluorescent material 214 includes, for example, gadolinium (Gd), terbium (Tb), gallium (Ga), manganese (Mn), or any combination thereof.

[0048] In this embodiment, the wavelength of the converted light beam L2 can be determined according to the fluorescent glass 210 and / or the second fluorescent material 220 used. For example, when the glass material 212 is borosilicate glass (SiO2-B2O5-R2O) and the first fluorescent material 214 is gadolinium (Gd), the fluorescent glass 210 formed by the glass material 212 and the first fluorescent material 214 is borosilicate glass containing gadolinium (SiO2-B2O5-R2O:Gd), and its fluorescent spectrum (i.e., the wavelength energy distribution of the first light beam L21) is as follows: Figure 4A In other embodiments, when the first fluorescent material 214 is terbium (Tb), the fluorescent glass 210 formed by the glass material 212 and the first fluorescent material 214 is a borosilicate glass containing terbium (SiO2-B2O5-R2O:Tb), and its fluorescent spectrum (i.e., the wavelength energy distribution of the first light beam L21) is as shown in FIG. Figure 4B When the first fluorescent material 214 is manganese (Mn), the fluorescent glass 210 formed by the glass material 212 and the first fluorescent material 214 is manganese-containing borosilicate glass (SiO2-B2O5-R2O:Mn), and its fluorescent spectrum (i.e., the wavelength energy distribution of the first light beam L21) is as shown in FIG. Figure 4C shown.

[0049] On the other hand, in this embodiment, the second fluorescent material 220 includes, for example, cerium-doped yttrium aluminum garnet (YAG:Ce), cerium-doped lumen aluminum garnet (LuAG:Ce) or a combination thereof. For example, when the second fluorescent material 220 is cerium-doped yttrium aluminum garnet, its fluorescent spectrum (i.e., the wavelength energy distribution of the second light beam L22) is as follows: Figure 5A When the second fluorescent material 220 is cerium aluminum garnet, its fluorescent spectrum (i.e., the wavelength energy distribution of the second light beam L22) is as shown in FIG. Figure 5B shown.

[0050] In this embodiment, when the fluorescent glass 210 is borosilicate glass containing gadolinium (SiO2-B2O5-R2O:Gd) and the second fluorescent material 220 is cerium-doped yttrium aluminum garnet (YAG:Ce), the fluorescent spectrum of the wavelength conversion material 120 (i.e., the light wavelength energy distribution of the converted light beam L2) is as follows: Figure 6As shown. Since the wavelength peak of the first light beam L21 is greater than the wavelength peak of the second light beam L22, the color point (x, y) of the converted light beam L2 formed by the wavelength conversion material 120 in the CIE color space is, for example, (0.452, 0.503), which is optimized compared to the color point (0.418, 0.554) of the light beam generated by the existing fluorescent layer (i.e., fluorescent glass without luminous effect) in the CIE color space, and a better optical effect can be obtained. In addition, when the first fluorescent material 214 is selected from gadolinium (Gd), terbium (Tb), gallium (Ga) or any combination thereof, the wavelength peak of the first light beam L21 is greater than the wavelength peak of the second light beam L22. When the first fluorescent material 214 is selected from manganese (Mn), the wavelength peak of the first light beam L21 is less than the wavelength peak of the second light beam L22. It can be seen that the color point of the converted light beam L2 generated by the wavelength conversion material 120 of this embodiment can be adjusted by selecting the first fluorescent material 214 and the second fluorescent material 220.

[0051] Figure 7 FIG. 4 is a flow chart of the steps of a method for manufacturing a wavelength conversion element according to an embodiment of the present invention. Figure 7 The method for manufacturing the wavelength conversion element shown can be applied to at least Figure 3 The wavelength conversion element 100 is shown. Please also refer to Figure 3 and Figure 7 . In the method for manufacturing the wavelength conversion element 100 of the present embodiment, first, step S300 is performed to mix the glass material 212 and the first fluorescent material 214 to form a fluorescent glass raw material. Specifically, the powdered first fluorescent material 214 is added to the powdered glass material 212, and the two are mixed to form a powdered fluorescent glass raw material. For example, the powdered first fluorescent material 214 is added to powdered silicate, borate and / or alkali metals. After obtaining the powdered fluorescent glass raw material, step S301 is performed to manufacture the fluorescent glass 210 by using the fluorescent glass raw material. Specifically, in this step, the powdered fluorescent glass raw material is first heated to form a high-temperature molten fluorescent glass liquid. In a preferred embodiment, the powdered fluorescent glass raw material is heated so that the temperature of the liquid fluorescent glass liquid is between 1200 degrees and 1600 degrees, and the powdered fluorescent glass raw material is heated so that the viscosity of the liquid fluorescent glass liquid is 1Pa·s (Pascal·second). In this way, the fluorescent glass sintered body (i.e., the wavelength conversion material 120) formed subsequently can have a better light transmittance. Then, the molten fluorescent glass liquid is cooled to form the fluorescent glass 210. Specifically, the molten fluorescent glass liquid is cooled to room temperature to obtain the fluorescent glass 210 capable of being excited to emit the first light beam (fluorescence) L21.

[0052] After obtaining the fluorescent glass 210, step S302 is performed to mix the second fluorescent material 220 and the fluorescent glass 210 and sinter to form the wavelength conversion material 120, wherein the first fluorescent material 214 is different from the second fluorescent material 220. Specifically, in this step, the fluorescent glass 210 is firstly ground to form a fluorescent glass powder. Then, the second fluorescent material 220 and the fluorescent glass powder are mixed and then heated and sintered to form the wavelength conversion material 120. The fluorescent glass powder fills the multiple gaps between the second fluorescent materials 220 during the sintering process. It should be noted that the particle size of the second fluorescent material 220 is between 10 microns and 40 microns, and the first fluorescent material 214 has been melted at high temperature with the glass material 212 in step S301 to form the fluorescent glass 210. Therefore, the first fluorescent material 214 in the fluorescent glass 210 has been uniformly mixed with the glass material 212, and the first fluorescent material 214 is not granular. In a preferred embodiment, the second fluorescent material 220 and the fluorescent glass 210 are sintered so that the sintering temperature of the wavelength conversion material 120 is between 700 degrees and 900 degrees, and the second fluorescent material 220 and the fluorescent glass 210 are sintered so that the viscosity of the wavelength conversion material 120 is between 10 2 Pa·s~10 5.5 In a preferred embodiment, when the sintering temperature is between 800 degrees and 850 degrees, the formed fluorescent glass sintered body (i.e., wavelength conversion material 120) has a better light transmittance. In a preferred embodiment, the temperature of the liquid fluorescent glass body formed in step 301 is greater than the sintering temperature of the wavelength conversion material 120 formed by sintering the second fluorescent material 220 and the fluorescent glass 210 in step S302.

[0053] Finally, after obtaining the wavelength conversion material 120 , step S303 is executed to configure the wavelength conversion material 120 on the substrate 110 to form the wavelength conversion element 100 .

[0054] In summary, the embodiments of the present invention have at least one of the following advantages or effects. In the wavelength conversion element, projection device and wavelength conversion element manufacturing method of the present invention, the wavelength conversion element includes a substrate and a wavelength conversion material, and the wavelength conversion element is configured on the transmission path of the excitation light beam. Among them, the wavelength conversion material includes fluorescent glass and a second fluorescent material, and the fluorescent glass includes a glass material and a first fluorescent material. Among them, the first fluorescent material is different from the second fluorescent material. In this way, the wavelength conversion material can achieve the effect of composite luminescence, improve the luminous efficiency of the wavelength conversion material, and also can achieve the effect of adjusting the color point of the light beam by exciting the wavelength difference of the light beam generated by two different fluorescent materials.

[0055] The above description is only a preferred embodiment of the present invention, and it cannot be used to limit the scope of the implementation of the present invention. That is, all simple equivalent changes and modifications made in accordance with the claims of the present invention and the specification of the present invention are still within the scope of the patent of the present invention. In addition, any embodiment or claim of the present invention is not required to achieve all the purposes, advantages or features disclosed in the present invention. In addition, the abstract of the specification and the name of the invention are only used to assist in the retrieval of patent documents, and are not used to limit the scope of rights of the present invention. In addition, the terms "first", "second", etc. mentioned in this specification or claims are only used to name the name of the element or distinguish different embodiments or scopes, and are not used to limit the upper or lower limit of the number of elements.

Claims

1. A wavelength conversion element, characterized in that: The wavelength conversion element comprises a substrate and a wavelength conversion material, wherein: The wavelength conversion material is disposed on the substrate, and is used to convert the excitation light beam into a conversion light beam. The wavelength conversion material includes fluorescent glass and a second fluorescent material, wherein: The fluorescent glass comprises a glass material and a first fluorescent material; The fluorescent glass covers the second fluorescent material, and the first fluorescent material is different from the second fluorescent material.

2. The wavelength conversion element according to claim 1, characterized in that The converted light beam has a plurality of different wavelength peaks.

3. The wavelength conversion element according to claim 1, characterized in that The fluorescent glass is used to convert the excitation beam into a first beam, and the second fluorescent material is used to convert the excitation beam into a second beam. The peak wavelength of the first beam is different from the peak wavelength of the second beam, and the converted beam includes at least one of the first beam and the second beam.

4. The wavelength conversion element according to claim 3, characterized in that: The peak wavelength of the first light beam is greater than the peak wavelength of the second light beam.

5. The wavelength conversion element according to claim 3, characterized in that: The peak wavelength of the first light beam is smaller than the peak wavelength of the second light beam.

6. The wavelength conversion element according to claim 1, characterized in that: The glass material includes silicate, borate, aluminate, phosphate, alkali metal, alkaline earth metal, zinc oxide or any combination thereof.

7. The wavelength conversion element according to claim 1, characterized in that: The thickness of the wavelength conversion material is between 0.05 mm and 0.5 mm.

8. The wavelength conversion element according to claim 1, characterized in that: The first fluorescent material includes gadolinium, terbium, gallium, manganese or any combination thereof.

9. The wavelength conversion element according to claim 1, characterized in that: The second fluorescent material includes cerium-doped yttrium aluminum garnet, cerium-doped aluminum garnet or a combination thereof.

10. The wavelength conversion element according to claim 1, characterized in that: The weight percentage concentration of the fluorescent glass in the wavelength conversion material is between 40% and 70%.

11. The wavelength conversion element according to claim 1, characterized in that: The weight percentage concentration of the first fluorescent material in the fluorescent glass is less than or equal to 10%.

12. The wavelength conversion element according to claim 1, characterized in that: The weight percentage concentration of the first fluorescent material in the wavelength conversion material is less than or equal to 10%.

13. The wavelength conversion element according to claim 1, characterized in that: The weight percentage concentration of the second fluorescent material in the wavelength conversion material is between 30% and 60%.

14. The wavelength conversion element according to claim 1, characterized in that: The substrate has a wavelength conversion area and a non-wavelength conversion area, and the wavelength conversion material is configured in the wavelength conversion area.

15. A projection device, characterized in that: The projection device comprises an illumination system, a light valve and a projection lens, wherein: The lighting system is used to provide an illumination beam, and the lighting system includes a light source module and a wavelength conversion element, wherein: The light source module is used to provide an excitation light beam; and The wavelength conversion element is disposed on the transmission path of the excitation light beam, and the wavelength conversion element includes a substrate and a wavelength conversion material, wherein: The wavelength conversion material is disposed on the substrate, and the wavelength conversion material is used to convert the excitation beam into a conversion beam. The wavelength conversion material includes a fluorescent glass and a second fluorescent material, wherein the fluorescent glass includes a glass material and a first fluorescent material, the fluorescent glass covers the second fluorescent material, and the first fluorescent material is different from the second fluorescent material. The illumination beam includes at least one of the excitation beam and the conversion beam. The light valve is disposed on the transmission path of the illumination light beam, and is used to convert the illumination light beam into an image light beam; and The projection lens is arranged on the transmission path of the image light beam and is used for projecting the image light beam out of the projection device.

16. A method for manufacturing a wavelength conversion element, characterized in that: The method comprises: Mixing a glass material and a first fluorescent material to form a fluorescent glass body raw material; Making fluorescent glass by using the fluorescent glass raw material; mixing a second fluorescent material and the fluorescent glass and sintering to form a wavelength conversion material, wherein the first fluorescent material is different from the second fluorescent material; and The wavelength conversion material is disposed on a substrate to form the wavelength conversion element.

17. The method for manufacturing a wavelength conversion element according to claim 16, characterized in that: The step of making the fluorescent glass by using the fluorescent glass raw material also includes: heating the fluorescent glass raw material to form a fluorescent glass liquid; and The fluorescent glass liquid is cooled to form the fluorescent glass.

18. The method for manufacturing a wavelength conversion element according to claim 17, characterized in that: The fluorescent glass raw material is heated so that the temperature of the fluorescent glass liquid is between 1200 degrees and 1600 degrees.

19. The method for manufacturing a wavelength conversion element according to claim 17, wherein: The fluorescent glass raw material is heated to make the viscosity of the fluorescent glass liquid be 1 Pa·s.

20. The method for manufacturing a wavelength conversion element according to claim 16, wherein: The step of mixing the second fluorescent material and the fluorescent glass and sintering to form the wavelength conversion material further includes: grinding the fluorescent glass to form fluorescent glass powder; and The second fluorescent material and the fluorescent glass powder are mixed and heated and sintered to form the wavelength conversion material.

21. The wavelength conversion element according to claim 16, characterized in that: The second fluorescent material and the fluorescent glass are sintered so that the sintering temperature of the wavelength conversion material is between 700 degrees and 900 degrees.

22. The wavelength conversion element according to claim 16, characterized in that The second fluorescent material and the fluorescent glass are sintered so that the viscosity of the wavelength conversion material is between 10 2 Pa·s~10 5.5 Between Pa.s.

23. The wavelength conversion element according to claim 16, characterized in that: The temperature of the formed fluorescent glass is greater than the sintering temperature of the wavelength conversion material formed by sintering the second fluorescent material and the fluorescent glass.

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