Composite fluorescent sheet, optical element and display equipment

Abstract

The utility model provides a composite fluorescent sheet, an optical element and display equipment, and belongs to the technical field of lighting materials. The composite fluorescent sheet comprises a plurality of fluorescent sheets which are uniformly distributed on the same plane to form a planar sheet structure; wherein the plurality of fluorescent sheets are uniformly distributed along the horizontal direction and / or the vertical direction, and the colors of light emitted by the plurality of fluorescent sheets are more than two. According to the invention, the composite fluorescent sheet is formed by adopting the plane design generating fluorescence of different light colors, so that the luminous efficiency and the color rendering performance are effectively improved, the reabsorption among different fluorescent materials is reduced, and the luminous efficiency of the fluorescent ceramic material can be ensured while the high color rendering performance is obtained.

Description

Technical Field

[0001] The present invention belongs to the technical field of lighting materials, and in particular relates to a composite fluorescent sheet, an optical element and a display device. Background Art

[0002] At present, the solid-state light sources used in the lighting field are mainly white light emitting diodes (LEDs), among which the method of using blue light chips and yellow phosphors to achieve white light output is the mainstream solution for LED lighting. However, this type of LED has an "efficiency drop" phenomenon that is unrelated to heat dissipation. As the driving power density increases, the luminous efficiency will decay rapidly. Compared with white light LEDs, white light semiconductor lasers (Laser Diodes, LDs) have the advantages of higher luminous efficiency, less energy consumption, and better directionality, and are expected to become a new generation of lighting sources. In white light LDs, the ideal solution is to mix blue light LD chips with green-yellow phosphors and orange or red phosphors to achieve white light emission. However, in this packaging method, organic materials such as resins have poor heat dissipation performance and heat accumulation effects. They are very easy to age and deteriorate at high temperatures, causing light decay and color drift, which greatly reduces the service life of white light LDs. In particular, since the LD excitation light power is larger and the excitation area is smaller, the packaging method that only uses phosphors directly affects the working efficiency and service life of the device, greatly limiting its development in the field of high-power white light LDs.

[0003] Currently, the fluorescent films are mainly monochromatic fluorescent films (such as YAG yellow light), which are combined with blue light LD to obtain white light LD. Due to the single color component in the spectrum, the white light obtained by mixing the colors is of poor quality, poor luminous efficiency, and low color rendering index of white light, which is difficult to meet the needs of general lighting or backlighting. Utility Model Content

[0004] The present disclosure aims to solve at least one of the technical problems existing in the prior art and provide a composite fluorescent sheet, an optical element and a display device.

[0005] In one aspect of the present disclosure, a composite fluorescent sheet is provided, the composite fluorescent sheet comprising a plurality of fluorescent sheets, the plurality of fluorescent sheets being evenly distributed on the same plane to form a planar sheet structure; wherein:

[0006] The plurality of fluorescent sheets are evenly distributed in a horizontal direction and / or a vertical direction, and the plurality of fluorescent sheets emit light of two or more colors.

[0007] Optionally, two adjacent fluorescent sheets among the plurality of fluorescent sheets emit light of different colors.

[0008] Optionally, the plurality of fluorescent sheets are arranged in an array, and each row or column of the array includes at least two fluorescent sheets, and each fluorescent sheet emits light of a different color.

[0009] Optionally, the plurality of fluorescent sheets are evenly arranged in a horizontal direction or a vertical direction, and the colors of light emitted by the plurality of fluorescent sheets are all different.

[0010] Optionally, the fluorescent sheet is selected from LuAG:Ce 3+ Fluorescent ceramics, YAG:Ce 3+ Fluorescent ceramics, La3Si6N 11 :Ce 3+ Fluorescent ceramics, α-sialon fluorescent ceramics, β-sialon fluorescent ceramics, γ-AlON fluorescent ceramics, CaAlSiN3:Eu 2+ Fluorescent ceramics, (Sr,Ca)AlSiN3:Eu 2+ Fluorescent ceramics and SrLiAl3N4:Eu 2+ Any of the fluorescent ceramic sheets.

[0011] Optionally, in the composite fluorescent sheet, one of the fluorescent sheets is used as a starting fluorescent sheet, and the remaining fluorescent sheets are sequentially arranged on one side of the starting fluorescent sheet along the horizontal direction and / or the vertical direction; wherein,

[0012] The starting fluorescent sheet is LuAG:Ce 3+ Fluorescent ceramic sheet or β-sialon fluorescent ceramic sheet.

[0013] Optionally, among the plurality of fluorescent sheets, a width of a connecting gap between adjacent fluorescent sheets is less than 3 micrometers.

[0014] In another aspect of the present disclosure, an optical element is provided, comprising the composite fluorescent sheet described above.

[0015] Optionally, the optical element is a wavelength conversion element or an optical color wheel.

[0016] In another aspect of the present disclosure, a display device is provided, comprising a light source and the optical element described above.

[0017] The present disclosure proposes a composite fluorescent sheet, an optical element, and a display device, wherein the composite fluorescent sheet includes a plurality of fluorescent sheets, and the plurality of fluorescent sheets are evenly distributed on the same plane to form a planar sheet structure; wherein the plurality of fluorescent sheets are evenly distributed in the horizontal direction and / or the vertical direction, and the plurality of fluorescent sheets emit light of two or more colors. The present disclosure forms a composite fluorescent sheet by adopting a plane design that generates fluorescence of different light colors, thereby effectively improving the luminous efficiency and color rendering performance, reducing the reabsorption between different fluorescent materials, obtaining high color rendering performance, and ensuring the luminous efficiency of fluorescent ceramic materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the composite fluorescent sheet of Example 2 of the present disclosure;

[0019] Figure 2 This is a schematic diagram of the application of the composite fluorescent sheet according to Embodiment 2 of the present disclosure;

[0020] Figure 3 It is a schematic diagram of the structure of the composite fluorescent sheet of Example 3 of the present disclosure;

[0021] Figure 4 This is a schematic diagram of the application of the composite fluorescent sheet of Example 3 of the present disclosure;

[0022] Figure 5 This is a schematic diagram of the application of the composite fluorescent sheet of Example 3 of the present disclosure. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the technical solution of the present disclosure, the present disclosure is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific embodiments described herein are only used to explain the present disclosure and are not used to limit the disclosure. The described embodiments are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present disclosure.

[0024] In some descriptions of the present disclosure, the terms "include" or "comprises" and the like neither limit the mentioned shapes, numbers, steps, actions, operations, components, originals and / or their groups, nor exclude the presence or addition of one or more other different shapes, numbers, steps, actions, operations, components, originals and / or their groups.

[0025] In some descriptions of the present disclosure, the terms "first", "second" and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number and order of the indicated technical features.

[0026] In some descriptions of the present disclosure, terms such as "installed", "connected", "connected" or "fixed" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect through an intermediate medium, and may be internal connections between two elements or mutual interactions between two elements.

[0027] In some descriptions of the present disclosure, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or position relationships based on the orientations or position relationships shown in the accompanying drawings and are only used to indicate relative position relationships. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0028] In one aspect of the present disclosure, a composite fluorescent sheet is proposed, which includes a plurality of fluorescent sheets, which are evenly distributed on the same plane to form a planar sheet structure; wherein the plurality of fluorescent sheets are evenly distributed along the horizontal direction and / or vertical direction, and the plurality of fluorescent sheets emit light of more than two colors.

[0029] In this embodiment, by using multiple fluorescent sheets that generate different fluorescence to form a composite fluorescent sheet with a planar structure, the reabsorption between different fluorescent materials can be reduced. In this way, while ensuring high color rendering performance, the luminous efficiency of the fluorescent ceramic material can also be effectively improved. At the same time, the composite fluorescent sheet can also withstand 1 to 20 W / mm 2 The irradiation of a high-power density laser light source has excellent luminous stability and can also greatly improve the scattering of the laser light source, making the output light more uniform.

[0030] It should be noted that the present embodiment does not specifically limit the number of fluorescent sheets, for example, three fluorescent sheets, four fluorescent sheets, six fluorescent sheets, eight fluorescent sheets, etc.

[0031] It should be further explained that the present embodiment does not specifically limit the arrangement of the multiple fluorescent sheets. For example, the multiple fluorescent sheets are evenly distributed in the horizontal direction, or the multiple fluorescent sheets are evenly distributed in the vertical direction. Of course, the multiple fluorescent sheets can also be distributed both in the horizontal direction and in the vertical direction to form an array arrangement.

[0032] In some preferred embodiments, Figure 1 As shown, the composite fluorescent sheet 100 includes a first fluorescent sheet 110 , a second fluorescent sheet 120 , and a third fluorescent sheet 130 , and the three fluorescent sheets are evenly arranged in a horizontal direction.

[0033] In other preferred embodiments, Figure 3 As shown, the composite fluorescent sheet 100 includes two first fluorescent sheets 110, two second fluorescent sheets 120, and two third fluorescent sheets 130. Three of the six fluorescent sheets are evenly arranged in the first row along the horizontal direction, and the other three fluorescent sheets are evenly arranged in the second row along the horizontal direction to form a 2*3 rectangular array.

[0034] It should be noted that the colors of light emitted by multiple fluorescent sheets should be at least two or more. In some preferred embodiments, there can be three, four or more colors, which needs to be determined according to the number of fluorescent sheets to achieve a full spectrum that is extremely similar to sunlight.

[0035] In some preferred embodiments, two adjacent fluorescent sheets among the plurality of fluorescent sheets emit light of different colors, and emit white light after being excited by the laser of the light source, thereby providing a color rendering index of white light.

[0036] In other preferred embodiments, a plurality of fluorescent sheets are arranged in an array, and each row or column of the array includes at least two fluorescent sheets, and each fluorescent sheet emits light of a different color. That is, the plurality of fluorescent sheets in each row or column are fluorescent sheets that can emit light of different colors.

[0037] Of course, it should be understood that the above arrangement of the multiple fluorescent sheets is only an example. In other preferred embodiments, other arrangements are possible and are not specifically limited thereto.

[0038] In this embodiment, the composite fluorescent sheet includes pixel points of multiple luminous wavelengths on a plane, so that it can well match the lighting characteristics of the light source and match fluorescent sheets with different luminous properties at different locations of the structure to bring out the best performance of each fluorescent sheet and improve the luminous efficiency.

[0039] It should be noted that the fluorescent sheet is a fluorescent sheet that emits any one of yellow light, red light, reddish-yellow light, green light or yellow-green light under the excitation of a blue light LED or a blue light LD.

[0040] In some preferred embodiments, the colors of light emitted by multiple fluorescent sheets are different, that is, one fluorescent sheet emits light of one color. For example, one fluorescent sheet can emit yellow light, another fluorescent sheet can emit red light, another fluorescent sheet can emit green light, and so on.

[0041] In other preferred embodiments, fluorescent sheets that can emit light of different colors are regularly arranged at intervals. For example, when there are three fluorescent sheets arranged in the horizontal direction, the first fluorescent sheet is a fluorescent sheet that can emit yellow light, the second fluorescent sheet is a fluorescent sheet that can emit red light, and the third fluorescent sheet is a fluorescent sheet that can emit green light. Of course, in other preferred embodiments, fluorescent sheets that can emit other colors can also be selected, and this is not specifically limited.

[0042] It should be noted that the present embodiment does not impose any specific restrictions on the material of the fluorescent sheet, as long as it can emit light of different colors under the excitation of a blue light LED or a blue light LD.

[0043] In some preferred embodiments, the substrate of the fluorescent sheet material is glass, ceramic or high temperature resistant resin.

[0044] As a further preferred solution, the substrate of the fluorescent sheet material is an aluminum oxide or aluminum nitride ceramic substrate.

[0045] As a further preferred solution, the fluorescent sheet is selected from LuAG:Ce 3+ Fluorescent ceramics, YAG:Ce 3+ Fluorescent ceramics, La3Si6N 11 :Ce 3+ Fluorescent ceramics, α-sialon fluorescent ceramics, β-sialon fluorescent ceramics, γ-AlON fluorescent ceramics, CaAlSiN3:Eu 2+ Fluorescent ceramics, (Sr,Ca)AlSiN3:Eu 2+ Fluorescent ceramics and SrLiAl3N4:Eu 2+ Any of the fluorescent ceramic sheets.

[0046] It is still necessary to explain that when multiple fluorescent sheets are evenly arranged, one of the fluorescent sheets is used as the starting fluorescent sheet, and the remaining fluorescent sheets are arranged on one side of the starting fluorescent sheet in the horizontal direction and / or vertical direction. In other words, a planar sheet structure evenly distributed is formed with one fluorescent sheet as the starting point.

[0047] In some preferred embodiments, the starting phosphor is LuAG:Ce 3+ Fluorescent ceramic sheet or β-sialon fluorescent ceramic sheet.

[0048] As a further preferred embodiment, LuAG:Ce 3+ The raw materials and molar ratio of the fluorescent ceramics can be Lu a (Al b Ga c ) 12 :xCe 3+ , 2.8≤a≤3, 2≤b≤5, 0≤c≤3, 0.001≤c≤0.2.

[0049] As a further preferred embodiment, the raw materials and molar ratio of β-sialon fluorescent ceramics can be Si 6- z Al z OzN 8-z : x Eu, 0.1≤z≤0.3, 0.001≤x≤0.05.

[0050] It should also be understood that the multiple fluorescent sheets should be arranged closely together to minimize the gap between them so as to make the emitted light more uniform.

[0051] In some preferred embodiments, the width of the connecting gap between adjacent phosphor sheets is less than 3 microns.

[0052] As a further preferred solution, the width of the connecting gap between adjacent fluorescent sheets is 0, that is, there is no gap between adjacent fluorescent sheets.

[0053] It should be noted that the present embodiment also does not specifically limit the connection method between the multiple fluorescent sheets. For example, adjacent fluorescent sheet layers are connected by bonding, welding or sintering.

[0054] It should be understood that when adjacent fluorescent sheets are connected by co-sintering, a seamless connection can be achieved. When connected by bonding or welding, the width of the connection gap is generally not more than 3 microns, otherwise it will affect the light output performance.

[0055] It should be noted that the present embodiment does not specifically limit the size of the multiple fluorescent sheets, which can be determined according to actual needs, and the sizes of the multiple fluorescent sheets can be the same or different. That is, after the starting fluorescent sheet is determined, the remaining fluorescent sheets can be extended in equal or unequal proportions.

[0056] It should be noted that the present embodiment does not specifically limit the shapes of the plurality of fluorescent sheets, and the shapes may be square or quasi-square.

[0057] The composite fluorescent sheet of this embodiment not only has a high color rendering index and luminous efficiency, but also can withstand 1-20W / mm 2 The irradiation of the high-power density laser light source has excellent luminous stability and meets the needs of general lighting or backlighting.

[0058] The composite fluorescent sheet described above is prepared by the following method, which includes the following specific steps:

[0059] S1. Obtain corresponding slurries of various fluorescent sheets.

[0060] It should be noted that the slurry should include the phosphor corresponding to the phosphor sheet, as well as components such as an organic solvent and a dispersant. After these components are mixed and ball-milled, a slurry with a viscosity of 8000 mPa·s is obtained.

[0061] In some preferred embodiments, the phosphor may be LuAG:Ce 3+ Phosphor, YAG:Ce 3+ Phosphor, La3Si6N 11 :Ce 3+ Phosphor, α-sialon phosphor, β-sialon phosphor, γ-AlON phosphor, CaAlSiN3:Eu 2+ Phosphor, (Sr,Ca)AlSiN3:Eu 2+Phosphors and SrLiAl3N4:Eu 2+ Any of the phosphors.

[0062] In other preferred embodiments, the organic solvent is isopropanol or the like.

[0063] S2, printing one of the slurries on the surface of the substrate and curing it, printing another slurry on the surface of the green body and curing it, until the last slurry is printed on the surface of the green body and cured, to obtain a composite fluorescent sheet green body.

[0064] It should be understood that when printing multiple pastes on the substrate surface, the multiple pastes should be printed adjacent to each other, that is, another paste is printed in a position adjacent to the printed pattern obtained by curing in the previous step and then cured.

[0065] S3, subjecting the green composite fluorescent sheet to a debinding treatment at 400-600° C. in an air environment to obtain a debinding sheet.

[0066] In some preferred embodiments, the temperature may be 400°C, 430°C, 450°C, 470°C, 500°C, 550°C, 600°C.

[0067] S240, sintering the debonding sheet at 1600-1800° C. in a hydrogen atmosphere for 6-10 hours to obtain a composite fluorescent sheet.

[0068] In some preferred embodiments, the sintering temperature is 1600° C., 1650° C., 1670° C., 1700° C., 1730° C., 1750° C., 1800° C. The sintering time is 6 h, 7 h, 8 h, 9 h, 10 h.

[0069] In another aspect of the present disclosure, an optical element is provided, comprising the composite fluorescent sheet described above.

[0070] It should be noted that the composite fluorescent sheet of this embodiment can be applied in the field of lighting. For example, the optical element can be a wavelength conversion element or an optical color wheel.

[0071] In another aspect of the present disclosure, a display device is provided, comprising a light source and the optical element described above.

[0072] It should be noted that the light source can be a light-emitting chip or a laser chip, etc., without specific limitation. A composite fluorescent sheet is arranged in the irradiation direction of the light source of the light-emitting chip or the laser chip to convert the blue light emitted by the light source into white light.

[0073] In some preferred embodiments, the display device may be a projection device, which includes a laser light source and an optical color wheel. The optical color wheel generates excitation light under the excitation of laser light generated by the laser light source, which can greatly reduce the volume of the existing color wheel structure.

[0074] In other preferred embodiments, the display device can be a backlight display device, including a backlight display light source and a wavelength conversion element. The wavelength conversion element can adopt a composite fluorescent film, and the composite fluorescent film is arranged on the optical path of the light emitted from the light source to convert at least a part of the wavelength of the incident light and emit light of a wavelength different from the wavelength of the incident light, thereby achieving high luminous efficiency, high color rendering, high color gamut and other characteristics.

[0075] Of course, in other preferred embodiments, the display device may also be other optical devices, which is not specifically limited.

[0076] It should also be understood that the optical device should also include a bracket for supporting the composite fluorescent sheet and the light-emitting chip, that is, the bracket has a accommodating cavity, the light-emitting chip is arranged inside the bracket accommodating cavity, and the composite fluorescent sheet is arranged above the bracket. The light source emitted by the light-emitting chip is emitted along the outlet of the accommodating cavity and irradiates the composite fluorescent sheet to convert it.

[0077] The structure of the composite fluorescent sheet will be further described below in conjunction with several specific embodiments:

[0078] Example 1

[0079] This example provides a method for forming a composite fluorescent ceramic sheet and the performance of the composite fluorescent sheet, wherein the composite fluorescent sheet is formed by the following method, which specifically includes the following steps:

[0080] S1. First weigh 32.5g of YAG:Ce 3+ Phosphor powder, 30 g isopropyl alcohol and 0.25 g dispersant SC-0505K, as the materials of the first phosphor sheet; weigh 47.06 g LuAG:Ce 3+ Phosphor, 30 g isopropyl alcohol and 0.25 g dispersant SC-0505K, as the material of the second phosphor; weigh 53.26 g CaAlSiN3:Eu 2+ Phosphor powder, 30 grams of isopropyl alcohol and 0.25 grams of dispersant SC-0505K are used as materials for the third phosphor sheet; the three groups of raw materials are mechanically ball-milled for 8-12 hours to obtain a slurry with a viscosity of 8000 mPa·s;

[0081] S2. Print the three slurries prepared above in sequence according to a preset printing order. After each printing, dry and cure at 80° C. for 10 minutes before the next printing. After printing, obtain a composite fluorescent ceramic blank.

[0082] S3, placing the composite fluorescent ceramic blank in a resistance furnace for debinding treatment at a debinding temperature of 600° C., and finally sintering at a sintering temperature of 1800° C. for 10 hours to obtain the composite fluorescent sheet.

[0083] The composite fluorescent sheet prepared in Example 1 was excited by a 460nm blue light LED. After testing, the composite fluorescent sheet prepared had the following properties, as shown in Table 1: a color rendering index of 85 and a luminous efficiency of 203lm / W.

[0084] Table 1 Properties of composite phosphor sheets

[0085] Fluorescent ceramic materials Power W Color temperature K Color Rendering Index Luminous efficiency (lm / W) Example 1 6 3000 85 203 Comparative Example 1 6 3000 72 189

[0086] Comparative Example 1

[0087] The fluorescent sheet material of this example is two fluorescent materials equivalent to those in Example 1, and is a laminated structure. The lower fluorescent sheet material is YAG:Ce 3+ Phosphor sheet, the upper phosphor sheet material is LuAG:Ce 3+ The thickness of each laminated structure of the fluorescent sheet is the same as that of the composite fluorescent sheet of Example 1. The fluorescent sheet is excited by a 460nm blue light LED. After testing, the prepared composite fluorescent sheet has the following properties, as shown in Table 1, with a color rendering index of 72 and a luminous efficiency of 189lm / W.

[0088] It can be seen from the results of comparative example 1 and embodiment 1 that the composite fluorescent sheet proposed in the present disclosure has a higher color rendering index and light efficiency.

[0089] Example 2

[0090] like Figure 1 As shown, the composite fluorescent sheet 100 includes a first fluorescent sheet 110, a second fluorescent sheet 120 and a third fluorescent sheet 130, which are formed in the same plane along the horizontal direction, and starting from the first fluorescent sheet 110, the second fluorescent sheet 120 and the third fluorescent sheet 130 are parallel to the first fluorescent sheet 1, and are arranged in sequence on the right side of the first fluorescent sheet 110 to form a planar sheet structure. In addition, the first fluorescent sheet 110 and the second fluorescent sheet 120, and the second fluorescent sheet 120 and the third fluorescent sheet 130 can be seamlessly connected by co-sintering.

[0091] Furthermore, the composite fluorescent sheet provided in this embodiment is a composite fluorescent ceramic, which can be applied to the lighting field or backlight field excited by a blue light chip, wherein the first fluorescent sheet 110, the second fluorescent sheet 120 and the third fluorescent sheet 130 can respectively select blue light to excite and emit one of red light, red-yellow light, yellow light, green light or yellow-green light, so that the first fluorescent sheet 110, the second fluorescent sheet 120 and the third fluorescent sheet 130 form white light under the excitation of the same blue light source. Among them, the light emitted by the first fluorescent sheet 110, the second fluorescent sheet 120 and the third fluorescent sheet 130 under the blue light laser is different.

[0092] Furthermore, the materials that can be selected for the first fluorescent sheet 110, the second fluorescent sheet 120 and the third fluorescent sheet 130 in the second embodiment are CaAlSiN3:Eu 2+ Fluorescent ceramics, YAG:Ce 3+ Fluorescent ceramics, LuAG:Ce 3+ Fluorescent ceramics, La3Si6N 11 :Ce 3+ Fluorescent ceramics, α-sialon fluorescent ceramics, β-sialon fluorescent ceramics, γ-AlON fluorescent ceramics, (Sr,Ca)AlSiN3:Eu 2+ Fluorescent ceramic or SrLiAl3N4:Eu 2+ A type of fluorescent ceramic.

[0093] Of course, the first fluorescent sheet, the second fluorescent sheet and the third fluorescent sheet in the second embodiment may also be made of fluorescent glass or other fluorescent materials such as organic fluorescent materials (organic resin) and the like.

[0094] This embodiment 2 provides a new application structure of fluorescent materials, which breaks through the application form of existing laminated fluorescent sheets. Figure 2 As shown, the composite fluorescent sheet 100 is arranged along the irradiation direction of the light source of the light-emitting chip 210, so that when the light source emitted by the light-emitting chip 210 irradiates the composite fluorescent sheet 100, the light spot of the exciting light source can completely cover the entire composite fluorescent sheet, so that the exciting light source passes through different fluorescent sheets at one time, and finally obtains light of a preset color, such as white light. Since the composite fluorescent sheet provided in this embodiment is a single-layer structure, multiple fluorescent sheets are arranged adjacently along a plane, and the composite fluorescent sheet of this structure avoids the light loss caused by the exciting light source passing through different fluorescent layers in sequence, thereby improving the light effect, and the structure can be applied to a variety of scenes, further expanding the scope of application.

[0095] Example 3

[0096] like Figure 3 As shown, the composite fluorescent sheet 100 includes two first fluorescent sheets 110, two second fluorescent sheets 120 and two third fluorescent sheets 130, wherein, with the first fluorescent sheet 110 as the starting point, the second fluorescent sheets 120 and the third fluorescent sheets 130 are printed in sequence along the horizontal direction to form a first group of composite fluorescent materials; below the first group of composite fluorescent materials, with the third fluorescent sheet 130 as the starting point, the first fluorescent sheet 110 and the second fluorescent sheet 120 are printed in sequence along the horizontal direction to form a second group of composite fluorescent materials, and the second group of composite fluorescent materials is located below the first group of composite fluorescent materials, and the two groups of fluorescent sheet materials together constitute an array-type planar sheet-like composite fluorescent sheet.

[0097] In the third embodiment, the first fluorescent sheet 110, the second fluorescent sheet 120 and the third fluorescent sheet 130 can be made of fluorescent sheet materials with different luminous colors and fluorescent sheet materials with different luminous properties according to actual needs. The sizes of the first fluorescent sheet, the second fluorescent sheet and the third fluorescent sheet can be in equal or unequal proportions according to actual needs.

[0098] The composite fluorescent sheet provided in this embodiment 3 can be applied to the direct transmission of light from the excitation light source and the reflected light from the excitation light source (such as Figure 4 and Figure 5 ) application scenarios.

[0099] like Figure 4 As shown, the composite fluorescent sheet 100 can be used as a wavelength conversion medium in the field of lighting. For example, a backlight display device includes an LED bracket 220 and a light-emitting chip 210 arranged in the LED bracket. A composite chip 100 is also arranged above the LED bracket 220. In this way, the light source emitted by the light-emitting chip 210 in the LED bracket 220 is irradiated on the composite fluorescent sheet 100 to convert at least a part of the wavelength of the incident light and emit light of a wavelength different from the wavelength of the incident light to meet application requirements.

[0100] like Figure 5 As shown, the composite fluorescent sheet 100 is used in the fields of projection equipment and the like. For example, the projection equipment includes a packaging bracket 250, in which an excitation light source 230 and a reflecting mirror 240 are arranged. The reflecting mirror 240 is arranged on the side where the excitation light source 230 emits light, and the bottom of the reflecting surface bracket of the reflecting mirror 240 is inclined toward one side of the top of the bracket, that is, the inclined surface faces the excitation light source 230, so that the light emitted by the excitation light source 230 is reflected onto the composite fluorescent sheet 100 to convert the light source.

[0101] The present disclosure proposes a composite fluorescent sheet, an optical element and a display device, which have the following beneficial effects compared with the prior art: the present disclosure adopts a parallel design that generates fluorescence of different light colors to form a composite planar structure. The composite fluorescent sheet can match fluorescent ceramics with different luminous properties at different positions of the structure, bring out the best performance of each fluorescent sheet, and effectively improve the luminous efficiency and color rendering performance.

[0102] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present disclosure, but the present disclosure is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and substance of the present disclosure, and these modifications and improvements are also considered to be within the scope of protection of the present disclosure.

Claims

1. A composite fluorescent sheet, characterized in that: The composite fluorescent sheet comprises a plurality of fluorescent sheets, and the plurality of fluorescent sheets are evenly distributed on the same plane to form a planar sheet structure; wherein, The plurality of fluorescent sheets are evenly distributed in a horizontal direction and / or a vertical direction, and the plurality of fluorescent sheets emit light of two or more colors.

2. The composite fluorescent sheet according to claim 1, characterized in that: Two adjacent fluorescent sheets among the plurality of fluorescent sheets emit light of different colors.

3. The composite fluorescent sheet according to claim 1, characterized in that: The plurality of fluorescent sheets are arranged in an array, and each row or column of the array includes at least two fluorescent sheets, and each fluorescent sheet emits light of different colors.

4. The composite fluorescent sheet according to claim 1, characterized in that: The plurality of fluorescent sheets are evenly arranged in a horizontal direction or a vertical direction, and the colors of light emitted by the plurality of fluorescent sheets are all different.

5. The composite fluorescent sheet according to any one of claims 1 to 4, characterized in that: The fluorescent sheet is a fluorescent sheet that emits any one of yellow light, red light, reddish-yellow light, green light or yellow-green light under the excitation of a blue light LED or a blue light LD.

6. The composite fluorescent sheet according to claim 5, characterized in that: The fluorescent sheet is selected from LuAG:Ce 3+ Fluorescent ceramics, YAG:Ce 3+ Fluorescent ceramics, La3Si6N 11 :Ce 3+ Fluorescent ceramics, α-sialon fluorescent ceramics, β-sialon fluorescent ceramics, γ-AlON fluorescent ceramics, CaAlSiN3:Eu 2+ Fluorescent ceramics, (Sr,Ca)AlSiN3:Eu 2+ Fluorescent ceramics and SrLiAl3N4:Eu 2+ Any of the fluorescent ceramic sheets.

7. The composite fluorescent sheet according to claim 6, characterized in that: In the composite fluorescent sheet, one of the fluorescent sheets is used as the starting fluorescent sheet, and the remaining fluorescent sheets are sequentially arranged on one side of the starting fluorescent sheet along the horizontal direction and / or the vertical direction; wherein, The starting fluorescent sheet is LuAG:Ce 3+ Fluorescent ceramic sheet or β-sialon fluorescent ceramic sheet.

8. The composite fluorescent sheet according to any one of claims 1 to 4, characterized in that: In the plurality of fluorescent sheets, a width of a connection gap between adjacent fluorescent sheets is less than 3 micrometers.

9. An optical element, characterized in that: The optical element comprises the composite fluorescent sheet according to any one of claims 1 to 8.

10. A display device, characterized in that: The display device comprises a light source and the optical element according to claim 9.

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