CN112331754B - Light diffusion agent, preparation method thereof and application of light diffusion agent - Google Patents
Light diffusion agent, preparation method thereof and application of light diffusion agent Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/44—Semiconductor devices having potential barriers 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 coatings, e.g. passivation layer or anti-reflective coating
- H01L33/46—Reflective coating, e.g. dielectric Bragg reflector
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers 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 having potential barriers 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
- H01L33/52—Encapsulations
- H01L33/56—Materials, e.g. epoxy or silicone resin
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2933/00—Details relating to devices covered by the group H01L33/00 but not provided for in its subgroups
- H01L2933/0008—Processes
- H01L2933/0025—Processes relating to coatings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2933/00—Details relating to devices covered by the group H01L33/00 but not provided for in its subgroups
- H01L2933/0008—Processes
- H01L2933/0033—Processes relating to semiconductor body packages
- H01L2933/005—Processes relating to semiconductor body packages relating to encapsulations
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Abstract
The application belongs to the technical field of LEDs, and particularly relates to a light diffusant, a preparation method thereof and application of the light diffusant. The light diffusion agent comprises the following raw material components in parts by weight: 1-10 parts of diffusion powder and 5-50 parts of transparent glue, wherein the weight ratio of the diffusion powder to the transparent glue is 1: (2-10). This application light diffusant plays the homogenization to the light-emitting of LED screen lamp pearl, and granular sensation when reducing LED screen display prevents to produce light crosstalk between the LED lamp pearl, ensures the quality of screen pixel contrast and the image of demonstration, promotes user's visual perception.
Description
Technical Field
The application belongs to the technical field of LEDs, and particularly relates to a light diffusant, a preparation method thereof and application of the light diffusant.
Background
In recent years, the use of LED semiconductors has been widely used in the fields of lighting, display screens, and the like. In the LED screen, the difficult complete pixel region that covers of luminous scope of LED lamp pearl leads to LED screen to carry out image display and can produce the sense of particle, and LED lamp pearl interval is big more moreover, and the sense of particle is more obvious. At present, a diffusion film is generally added in front of the LED to reduce the granular feeling of the LED screen during displaying. But the diffusion barrier can make and produce luminous crosstalk between adjacent LED lamp pearl to make pixel contrast reduce, influence its quality of the image that shows.
Disclosure of Invention
The application aims to provide a light diffusion agent, a preparation method thereof and application of the light diffusion agent, and aims to solve the technical problems that the interval between lamp beads of an existing LED screen is large, the granular sensation is obvious, and an existing diffusion film can cause luminous crosstalk to a certain extent.
In order to achieve the purpose of the application, the technical scheme adopted by the application is as follows:
in a first aspect, the present application provides a light diffuser, which comprises the following raw material components in parts by weight:
1 to 10 parts of a dispersion powder,
5-50 parts of transparent glue water,
the weight ratio of the diffusion powder to the transparent glue is 1: (2-10).
In a second aspect, the present application provides a method for preparing a light diffusing agent, in which the light diffusing agent is obtained by mixing and grinding the raw material components of the light diffusing agent.
In a third aspect, the application provides an application of the light diffusing agent, and the light diffusing agent or the light diffusing agent prepared by the method is obtained and deposited on the light emitting surface of the LED chip.
The light diffusion agent that this application first aspect provided plays the homogenization to the light-emitting of LED screen lamp pearl, and granular sensation when reducing LED screen display prevents to produce optical crosstalk between the LED lamp pearl, ensures the quality of screen pixel contrast and the image of demonstration, promotes user's visual perception.
According to the preparation method of the light diffusion agent provided by the second aspect of the application, the light diffusion agent can be obtained by mixing and grinding the raw material components of the light diffusion agent in a formula amount, and the preparation method is simple in preparation process and suitable for industrial large-scale production and application.
In the application of the light diffusion agent provided by the third aspect of the application, the light diffusion agent is directly deposited on the light emitting surface of the LED chip in a coating, dispensing and other modes, and a light diffusion agent coating is formed on the LED panel after curing and forming. The light-emitting of LED screen lamp pearl plays the homogenization through light diffusant coating, and the granular sensation when reducing LED screen display prevents to produce light crosstalk between the LED lamp pearl, ensures the quality of screen pixel contrast and the image that shows, promotes user's visual perception.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIGS. 1-2 are schematic views illustrating a mask structure of an LED display screen according to an embodiment of the present disclosure;
the LED display screen comprises 100 parts of an LED display screen 10, a mask body 11, unit cells 20, a light diffusion agent layer 30, a substrate 40 and an LED light source;
FIG. 3 is a graph showing the light intensity of a luminescent spot of comparative example 1 without coating a light diffusing agent;
FIG. 4 is a light intensity test of a light emitting point at the line A-A in FIG. 3;
FIG. 5 is a graph showing the light intensity of a light emitting point of example 1 without coating a light diffusing agent;
FIG. 6 is a light intensity test of a light emitting point at line A-A in FIG. 5;
FIG. 7 is a graph showing the light emitting effect of an LED chip of comparative example 1, which is not coated with a light diffusing agent;
FIG. 8 is the luminous effect of the LED chip coated with the light diffuser of example 2;
FIG. 9 is the luminous effect of the LED chip coated with the light diffuser of example 3;
FIG. 10 is the light emitting effect of the LED chip coated with the light diffusing agent of example 4.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application more clearly apparent, the present application is further described in detail below with reference to the embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In the present invention, the term "and/or" describes the association relationship of the associated objects, and means that there may be three relationships, for example, a and/or B, which may mean: a is present alone, A and B are present simultaneously, and B is present alone. Wherein A and B can be singular or plural.
In the present invention, "at least one" means one or more, "a plurality" means two or more. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, "at least one (one) of a, b, or c," or "at least one (one) of a, b, and c," may each represent: a, b, c, a-b (i.e., a and b), a-c, b-c, or a-b-c, wherein a, b, and c may be single or plural, respectively.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
The weight of the related components mentioned in the description of the embodiments of the present invention may not only refer to the specific content of each component, but also represent the proportional relationship of the weight among the components, and therefore, the content of the related components is scaled up or down within the scope disclosed in the description of the embodiments of the present invention as long as it is in accordance with the description of the embodiments of the present invention. Specifically, the mass in the description of the embodiments of the present invention may be a mass unit known in the chemical industry field such as μ g, mg, g, kg, etc.
The first aspect of the embodiments of the present application provides a light diffusing agent, which comprises the following raw material components in parts by weight:
1 to 10 parts of a dispersion powder,
5-50 parts of transparent glue water,
the weight ratio of the diffusion powder to the transparent glue is 1: (2-10).
The weight ratio of the diffusion powder to the transparent glue in the light diffusion agent provided by the first aspect of the application is 1: (2 ~ 10), the diffusion powder has the reflex action to the light that the LED screen sent, through the multiple reflection of diffusion powder to light, can lead to the light angle to diffuse, plays the effect of homogenization light. If the amount of the diffusion powder in the light diffusing agent is too much, the brightness of the light emitting is reduced due to too many times of light reflection, and the diffusion powder with too high content is easy to agglomerate, so that the dispersion of the diffusion powder in the light diffusing agent is uneven, and the light emitting effect is reduced. The transparent glue can not only play a role in dispersing and diffusing the powder to form uniform and stable light diffusant slurry, but also can provide an adhesion function, so that the light diffusant is firmly and stably combined on the light emitting surface of the LED chip. The light diffusant provided by the embodiment of the application plays a role in homogenizing the light emitted by the LED screen lamp beads, reduces the granular sensation during the display of the LED screen, prevents the light crosstalk between the LED lamp beads, ensures the quality of the image of the contrast ratio and the display of the screen pixels, and improves the visual perception of a user.
In some embodiments, the diffusion powder is selected from: at least one of silicon particles, silicon dioxide, aluminum oxide and hollow glass beads, the diffusion powder has a good reflection effect on light, the powder particles reflect light for many times, the light can be homogenized, the light of the lamp beads is more full, the light emitting angle of the LED is enlarged, and accordingly the granular sensation of light emitting LED spots is eliminated. In addition, the diffusion powder is white or colorless, and the light emitting color of the LED screen cannot be influenced.
In some embodiments, the refractive index of the diffusion powder is 1.46-1.51, and the refractive diffusion powder simultaneously ensures the reflection effect and the brightness of the emergent light. If the refractive index is too large, the reflectivity is very small, and the light cannot be reflected; if the refractive index is too small, the luminance of the diffuser may be reduced. In some embodiments, the refractive index of the diffusion powder is 1.46 to 1.48, 1.48 to 1.50, or 1.50 to 1.51.
In some embodiments, the average particle size of the diffusion powder is 4-6 μm, and the diffusion powder particles with the particle size are well dispersed in the transparent glue, so that slurry of the light diffusion agent with uniform and stable dispersion is favorably formed, and a light diffusion layer with uniform thickness and smooth and stable film layer is favorably formed on the LED screen by the light diffusion agent. In some embodiments, the average particle size of the diffusion powder is 4 μm, 5 μm, or 6 μm, etc.
In some embodiments, the diffusion powder is selected from: at least one of silicon particles, silicon dioxide, aluminum oxide and hollow glass beads; the refractive index of the diffusion powder is 1.46-1.51; the average particle diameter of the diffusion powder is 4 to 6 μm.
In some embodiments, the transparent glue is selected from: the LED screen comprises at least one of epoxy resin hard glue, silica gel, liquid optical glue and UV glue, wherein the glue has good bonding performance and good adhesion to an LED screen, and is favorable for forming a stable light diffusion layer on the LED screen; and the glue has good dispersing effect on the dispersing powder, and is beneficial to forming uniform and stable light dispersing agent slurry. Moreover, the glue has high transmittance, and the effects of the LED screen such as light-emitting brightness cannot be influenced.
In some embodiments, the refractive index of the transparent glue is 1.40-1.54, the transparent glue with the refractive index can further homogenize the light of the LED screen, so that the light diffusant has a more comprehensive and stable homogenizing effect on the light, the granular sensation during the display of the LED screen is reduced, the light crosstalk among LED lamp beads is prevented, and the visual perception of a user is improved. If the refractive index is too large, the reflectivity is very small, and the light cannot be reflected; if the refractive index is too small, the luminance of the diffuser may be reduced. In some embodiments, the transparent glue has a refractive index of 1.40-1.42, 1.42-1.45, 1.45-1.48, 1.48-1.50, or 1.50-1.54.
In some embodiments, the transparent glue is selected from: at least one of epoxy resin hard glue, silica gel, liquid optical glue and UV glue; the refractive index of the transparent glue is 1.40-1.54.
In some embodiments, the transparent glue is a bi-component glue, and the stock solution A and the curing catalyst B are mixed and stirred for 5 to 15 minutes at normal temperature according to a certain proportion, so that the glue is ensured to have good fluidity and to flow uniformly.
In some embodiments, the viscosity of the light diffusion agent is 3000-4800mpa.s, and the viscosity not only enables the light diffusion agent to have a better bonding effect on an LED screen to form a light diffusion agent coating which is stably and firmly combined, but also has a better dispersion effect on diffusion powder, and is beneficial to depositing the light diffusion agent on the light emitting surface of an LED chip in a coating, dispensing and other modes. If the viscosity is too low, the adhesion effect is poor, and the fluidity is too strong, so that the thickness of the coating of the light diffusant is easily uneven; if the viscosity is too high, the construction of the light diffusion agent on the LED screen by coating, dispensing and the like is not facilitated, and the coating is also uneven. In some embodiments, the light diffuser has a viscosity of 3000 mPa.s-3200 mPa.s, 3200 mPa.s-3500 mPa.s, 3500 mPa.s-3700 mPa.s, 3700 mPa.s-4000 mPa.s, 4000 mPa.s-4200 mPa.s, 4200 mPa.s-4600 mPa.s, 4600 mPa.s-4800 mPa.s, etc.
The light diffusing agent provided by the embodiment of the application has a good homogenizing and diffusing effect on light, and simultaneously has high light transmittance which is 95% -99%, and the original performances of light emitting color, brightness and the like of an LED screen cannot be influenced.
In some embodiments, the light diffusion agent further comprises 0.1-2 parts by weight of an anti-settling agent, and the anti-settling agent is added to further improve the dispersion effect of the diffusion powder and prevent agglomeration and settling of powder particles, so that the dispersion stability and uniformity of the light diffusion agent slurry are further improved. If the content of the anti-settling agent is too low, the improvement effect is not obvious; if the content of the anti-settling agent is too high, the diffusion effect of the diffusion powder is affected, and the light-equalizing effect is not facilitated.
In some embodiments, the anti-settling agent is selected from: AEROSILR812S and/or opening agent, wherein the two anti-settling agents can effectively control the rheological property of the light diffusion agent, improve the dispersion stability of the diffusion powder and have small influence on the viscosity of the light diffusion agent.
In some embodiments, the light diffuser further comprises a diluent such as silicone oil, and the viscosity of the light diffuser is adjusted by adding the diluent, so that the light diffuser is suitable for wider application situations.
The light diffusing agent provided in the examples of the present application can be prepared by the following methods.
In a second aspect of the embodiments of the present application, a method for preparing a light diffusing agent is provided, in which raw material components in the light diffusing agent are mixed and ground to obtain the light diffusing agent.
According to the preparation method of the light diffusion agent provided by the second aspect of the application, the light diffusion agent can be obtained by mixing and grinding the raw material components of the light diffusion agent in a formula amount, and the preparation method is simple in preparation process and suitable for industrial large-scale production and application.
In some embodiments, the step of mixing and grinding comprises: mixing the raw material components according to the formula amount, grinding for 10-60 minutes to enable the raw material components to be uniformly dispersed, further refining and homogenizing the particle size of the diffusion powder, improving the stability of the slurry, vacuumizing for 2-3 times, removing air bubbles in the slurry, and avoiding the occurrence of air bubbles in a film layer during subsequent coating use to obtain the light diffusant.
In a third aspect of the embodiments of the present application, an application of the light diffusing agent is provided, where the light diffusing agent or the light diffusing agent prepared by the method is obtained and deposited on a light emitting surface of an LED chip.
In the application of the light diffusion agent provided by the third aspect of the application, the light diffusion agent is directly deposited on the light emitting surface of the LED chip in a coating, dispensing and other modes, and a light diffusion agent coating is formed on the LED panel after curing and forming. The light-emitting of LED screen lamp pearl plays the homogenization through light diffusant coating, and the granular sensation when reducing LED screen display prevents to produce light crosstalk between the LED lamp pearl, ensures the quality of screen pixel contrast and the image that shows, promotes user's visual perception.
In some embodiments, after the light diffusing agent is obtained, in order to prevent the light diffusing agent from being solidified and the diffusing powder from settling for too long time, the light diffusing agent is coated or dispensed on the light emitting surface of the LED chip within 1-2 hours.
In some embodiments, the light diffuser is deposited at a height that is flush with the height of the face mask of the grid structure in the LED chip. If the deposition height of the light diffusing agent is too thick, the light uniformizing effect is reduced, and if the deposition height of the light diffusing agent is too thin, the light uniformizing effect is not obtained, or a difference between left and right viewing angles is generated. The deposition height of the light diffusion agent in the embodiments of the present application refers to the thickness of the light diffusion agent layer formed on the light emitting surface of the LED chip by coating, dispensing, and the like.
In some embodiments, the light diffusing agent as described above may be disposed on the LED display screen, for example, by mounting a mask having a grid structure on the LED display screen and then applying the light diffusing agent to the mask of the grid structure.
In some embodiments, as shown in fig. 1 and 2, in the mask structure for LED display screens, a plurality of unit cells 11 are formed on a substrate 30 through a mask body 10, the plurality of unit cells 11 form a grid-like structure, each LED light source 40 on the LED display screen 100 is located in a unit cell 11 by attaching the mask body 10 to the LED display screen 100, and a light diffusing agent layer 20 is disposed in the unit cell 11 for wrapping the LED light sources 40 in the unit cell 11. The light diffusing agent layer 20 may be prepared using the light diffusing agent in any of the above embodiments. In the mask structure of the LED display screen of the embodiment of the present application, the light diffusing agent layer 20 can increase the uniformity of the LED light source 40, so as to homogenize the light and improve the light emitting effect of the LED display screen 100.
In order to make the above-mentioned implementation details and operations of the present application clearly understood by those skilled in the art and to make the progress of the light diffusing agent, its preparation method and its application obvious in the present application, the above-mentioned technical solutions are illustrated by a plurality of examples below.
Example 1
A light diffusing agent is prepared by the following steps:
mixing inorganic silicone resin microspheres with the average particle size of 4 mu m and the refractive index of 1.49 and silica gel glue (AB glue) with the light refractive index of 1.403-1.54 according to the powder-glue ratio of 1: 5, mixing, and grinding for 10 minutes to obtain the first light diffusant.
After the preparation is finished, a sample is subjected to ultraviolet-visible absorption spectrum test, and the light transmittance of the first light diffusant is measured to be 95% -98%; the viscosity of the first light diffuser mixture was measured to be 3000-.
Example 2
A light diffusing agent is prepared by the following steps:
mixing alumina particles with the average particle size of 6 mu m and the refractive index of 1.49 with UV glue with the light refractive index of 1.403-1.54 according to the powder glue ratio of 2: 5, mixing, and grinding for 10 minutes to obtain the second light diffusant.
After the preparation, a sample is taken for ultraviolet-visible absorption spectrum test, the light transmittance of the second light diffusant is measured to be 95% -99%, and a viscometer is used for testing, and the mixing viscosity is 3000-.
Example 3
A light diffusing agent is prepared by the following steps:
mixing silica particles with the average particle size of 4 mu m and the refractive index of 1.49 with silica gel glue (AB glue) powder glue with the light refractive index of 1.403-1.54 according to the proportion of 1: 10, mixing, and grinding for 10 minutes to obtain a third light diffusant.
After the preparation, a sample is taken for ultraviolet-visible absorption spectrum test, the light transmittance of the third light diffusant is measured to be 95% -99%, and a viscometer is used for testing, and the mixing viscosity is 3000-.
Example 4
A light diffusing agent is prepared by the following steps:
mixing silica particles with the average particle size of 4 mu m and the refractive index of 1.49 with silica gel glue (AB glue) with the light refractive index of 1.403-1.54 according to the powder-glue ratio of 1: 10, and adding an AEROSILR812S anti-settling agent, mixing, and grinding for 10 minutes to obtain a fourth light diffusion agent.
After the preparation, a sample is taken for ultraviolet-visible absorption spectrum test, the light transmittance of the fourth light diffusant is measured to be 95% -99%, and a viscosity meter is used for testing, and the mixing viscosity is 3000-.
Comparative example 1
An LED chip not subjected to the light diffusion treatment was used as comparative example 1.
Further, in order to verify the improvement of the light diffusing agent in the examples of the present application, performance tests were performed on the light diffusing agents of examples 1 to 4 and comparative example 1.
1. The effect of the first light diffusing agent in example 1 was fitted, and the light emitting effect of the light emitting point not coated with the first light diffusing agent and the light emitting point coated with the first light diffusing agent was fitted using Zemax. The fitting structure is shown in fig. 3 to 6. Wherein, FIG. 3 is a schematic diagram of light intensity of a light emitting point of comparative example 1 not coated with the first light diffusing agent, and FIG. 4 is a light intensity test of a light emitting point at the line A-A in FIG. 3 (ordinate is positional space deviation, x is abscissa); fig. 5 is a graph showing the light intensity of a light emitting point coated with the first light diffusing agent, and fig. 6 is a graph showing the light intensity measurement of the light emitting point at the line a-a in fig. 5 (the ordinate is the positional space deviation, and x is the abscissa).
Comparing fig. 3 and 5, it can be seen that before the first light diffusing agent is coated, the light emitting surface of the light emitting point is a small and concentrated light emitting surface; after the first light diffusant is coated, the light emitting surface of the light emitting point is increased, and the light intensity distribution in the light emitting surface is uniform.
As can be seen from a comparison of fig. 4 and 6, the intensity of the light emitting point is slightly decreased after the first light diffusing agent is applied, but the full width at half maximum of the peak representing the intensity of each light emitting point is increased, indicating that the light intensity area of the light emitting surface generated by the light emitting point is uniform.
The results of fig. 3 to 6 show that the coating of the light diffuser can act to homogenize the light, reducing or eliminating the granular sensation between the luminous spots.
2. Selecting LED chips with the same specification and model, and coating the light diffusant of the embodiment 2-4 on the light emitting surface of the LED chip under the same condition, wherein the coating thickness is flush with the mask of the grid structure. Meanwhile, an LED chip without any treatment is taken as a comparative example 1. Then, the LED chip is energized to observe the light emission of the LED chip.
The light emitting effect of the LED chip of comparative example 1, which was not coated with the light diffuser, is shown in fig. 7. As can be seen from the figure, in the case where the light diffusing agent is not coated, each LED chip emits light sharply, the light emitting surface coverage area is small, and a large dark field area exists around each LED chip.
The light emitting effect of the light diffusing agent of example 2 coated on the LED chip is shown in fig. 8. After the light diffusing agent in example 2 was used, the emitted light of the LED chip was homogenized, and the light emitting surface was expanded.
The light emitting effect of the light diffusing agent of example 3 coated on the LED chip is shown in fig. 9. After the light diffusing agent in example 3 was used, the emitted light of the LED chip was homogenized and the light emitting surface was expanded.
The light emitting effect of the light diffusing agent of example 4 coated on the LED chip is shown in fig. 10. After the light diffusing agent in example 4 was used, the emitted light of the LED chip was homogenized and the light emitting surface was expanded.
Comparing fig. 8 and 9, it can be seen that the light intensity of the LED display screen is slightly decreased after the particle size of the powder is increased.
Comparing fig. 10 and fig. 9, it can be seen that the fourth light diffusing agent in example 4 adds a precipitation preventing agent, and the precipitation preventing agent can slow down the agglomeration of the powder, promote the uniform diffusion of the powder in the glue, so that the difficulty of forming the light diffusing agent on the LED display screen is reduced, but the light homogenizing effect of the light diffusing agent itself is not significantly weakened.
In summary, the LED chip coated with the light diffusing agent of embodiment 1 to 4 of the present application has the advantages that the light emitting area is enlarged, light is uniform, the granular sensation of LED pixels is weak, no light crosstalk phenomenon occurs between LED lamp beads, the LED lamp beads are watched under a proper visual range, and the area coated with the light diffusing agent is connected into a whole. However, the LED chip of comparative example 1 without any treatment had a large interval between the light emitting points, exhibited point-like light emission, and the granular sensation of the LED pixel was significant, and the images were not integrated.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. The light diffusion agent is characterized by comprising the following raw material components in parts by weight:
1 to 10 parts of a dispersion powder,
5-50 parts of transparent glue water,
the weight ratio of the diffusion powder to the transparent glue is 1: (2-10);
wherein the refractive index of the diffusion powder is 1.46-1.51;
the average particle size of the diffusion powder is 4-6 mu m;
the refractive index of the transparent glue is 1.40-1.54;
the viscosity of the light diffusion agent is 3000-4800 mpa.s;
the transparent glue is bi-component glue, and the stock solution and the curing catalyst are mixed and stirred for 5 to 15 minutes at normal temperature;
the light diffusion agent also comprises 0.1-2 parts by weight of an anti-settling agent.
2. The light diffusing agent of claim 1, wherein the diffusing powder is selected from the group consisting of: at least one of silicon particles, silicon dioxide, aluminum oxide and hollow glass beads.
3. The light diffuser of claim 1 or 2, wherein said transparent glue is selected from the group consisting of: at least one of epoxy resin hard glue, silica gel, liquid optical glue and UV glue.
4. The light diffusing agent according to claim 3, wherein the light transmittance of the light diffusing agent is 95% to 99%.
5. The light diffusing agent according to claim 1 or 4,
the light diffuser also includes a diluent.
6. The light diffuser of claim 5, wherein said anti-settling agent is selected from the group consisting of: aerosil r812S and/or an opening agent;
and/or, the diluent is selected from silicone oil.
7. A method for preparing a light diffusing agent, characterized in that the light diffusing agent is obtained by mixing and grinding the raw material components of the light diffusing agent according to any one of claims 1 to 6.
8. The method for producing a light diffusing agent according to claim 7, wherein the step of mixing and grinding treatment comprises: mixing the raw material components according to the formula ratio, grinding for 10-60 minutes, and vacuumizing for 2-3 times to obtain the light diffusant.
9. The application of the light diffusion agent is characterized in that the light diffusion agent as claimed in any one of claims 1 to 6 or the light diffusion agent prepared by the method as claimed in any one of claims 7 to 8 is obtained and deposited on the light emitting surface of an LED chip.
10. The use of the light diffusing agent according to claim 9, wherein after the light diffusing agent is obtained, the light diffusing agent is coated or dispensed on the light emitting surface of the LED chip within 1 to 2 hours;
the deposition height of the light diffusion agent is flush with the height of a grid structure mask in the LED chip.
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