A multi-layer co-extrusion injection-molded quantum dot diffusion plate and its application

Abstract

The present invention relates to the technical field of optoelectronic display materials, and in particular to a multi-layer co-extrusion injection-molded quantum dot diffusion plate and its application. The quantum dot diffusion plate has three layers, from the outer layer to the inner layer, which are an outer transparent layer, a middle quantum dot layer, and an inner structural layer; and the thickness ratio of the three layers is (1-4): (2-5): (1-4). The quantum dot lens device of the present invention is formed in one step through a multi-layer co-extrusion injection molding process, which simplifies the production process and reduces costs, while ensuring the uniform dispersion of quantum dots and improving optical performance.

Description

Technical Field

[0001] The invention relates to the technical field of optoelectronic display materials, and in particular to a multi-layer co-extrusion injection-molded quantum dot diffusion plate and applications thereof. Background Art

[0002] Optoelectronic Display refers to a device or system that uses optoelectronic technology to convert electrical signals into visible light information and display it. It is widely used in electronic display screens, televisions, computer monitors, mobile phone screens and other devices. The core principle of optoelectronic display is to convert electrical signals into optical signals through optoelectronic devices (such as light-emitting diodes, liquid crystal materials, OLED, etc.), and then present the optical signals as images, text, videos and other information.

[0003] Quantum dot display technology (QLED, Quantum Dot Light Emitting Diode) emits light through nano-scale semiconductor materials (quantum dots) under the action of electric fields. Quantum dot materials can accurately control the wavelength of light to achieve purer colors. The colors are more saturated, brighter, and have high contrast. It is energy efficient and has good luminous efficiency and brightness. At present, most QLED displays still rely on backlight sources, but in the future, full QLED self-luminous display technology will develop rapidly.

[0004] Quantum dot display technology (QLED) is a display technology that uses nano-scale semiconductor materials (quantum dots) to generate light. It has become one of the hottest directions in modern display technology because it can provide high brightness, wide color gamut and precise color control. However, the development and application of quantum dot display technology faces some technical and industrial difficulties.

[0005] 1. Stability of quantum dot materials

[0006] The stability of quantum dot materials directly affects the life and performance of displays. In particular, blue quantum dots have a short life and are prone to degradation after long-term use, resulting in poor brightness and color performance of displays.

[0007] Quantum dots can oxidize or pyrolyze under the influence of electric current, especially under the influence of ultraviolet light and high temperature. Compared with red and green quantum dots, blue quantum dots are more susceptible to degradation.

[0008] 2. Challenges of quantum dot packaging technology

[0009] Quantum dot materials are sensitive to the environment and are easily affected by oxygen, moisture, and ultraviolet rays, which can lead to performance degradation. Therefore, packaging technology is the key to ensuring the stability of quantum dots. Good packaging technology can prevent external factors from affecting quantum dots and extend the service life of the display.

[0010] The nanoscale size of quantum dot materials and their sensitivity to the environment make packaging more difficult. Especially in large-area applications, imperfect packaging technology can lead to unstable performance of the display.

[0011] Quantum dot display technology has broad application prospects, but it still faces many challenges in the process of commercialization and further development. The stability of quantum dot materials, the development of cadmium-free materials, the improvement of luminous efficiency, the consistency of large-size panels, the technological breakthrough of self-luminous QLED, the control of production costs and the improvement of packaging technology are all technical problems that need to be solved urgently. Summary of the invention

[0012] In order to solve the above technical problems, the present invention provides a multi-layer co-extrusion injection-molded quantum dot diffusion plate, wherein the quantum dot diffusion plate has three layers, which are, from the outer layer to the inner layer, an outer transparent layer, a middle quantum dot layer, and an inner structural layer; and the thickness ratio of the three layers is (1-4): (2-5): (1-4).

[0013] As an embodiment of the present invention, the outer transparent layer is made of PMMA or PC.

[0014] As an embodiment of the present invention, the raw materials for preparing the intermediate quantum dot layer are quantum dot masterbatch and PMMA.

[0015] As an embodiment of the present invention, the mass ratio of the quantum dot-containing masterbatch to PMMA is 1:100.

[0016] As an embodiment of the present invention, the quantum dot-containing masterbatch is a masterbatch prepared by co-extrusion of quantum dots and polymers.

[0017] As an embodiment of the present invention, the raw materials for preparing the inner structural layer include a light diffuser and PMMA.

[0018] As an embodiment of the present invention, the mass ratio of the light diffusing agent to PMMA is 1:1000.

[0019] As an embodiment of the present invention, the light diffuser is a composite light diffuser.

[0020] As an embodiment of the present invention, the multi-layer co-extrusion injection-molded quantum dot diffusion plate is formed in one step by a multi-layer co-extrusion injection-molding process.

[0021] As an embodiment of the present invention, the multi-layer co-extrusion injection-molded quantum dot diffusion plate is applied in the field of LED semiconductor light emitting.

[0022] By adopting the above technical solution, the present invention has the following beneficial effects:

[0023] The quantum dot lens device of the present invention is formed in one step through a multi-layer co-extrusion injection molding process, which simplifies the production process and reduces costs, while ensuring uniform dispersion of quantum dots and improving optical performance. DETAILED DESCRIPTION

[0024] The technical solution of the present invention will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] The present invention provides a multi-layer co-extrusion injection-molded quantum dot diffusion plate, wherein the quantum dot diffusion plate has three layers, which are, from the outer layer to the inner layer, an outer transparent layer, a middle quantum dot layer, and an inner structural layer; and the thickness ratio of the three layers is 3:4:3.

[0026] The outer transparent layer is prepared from PMMA, HD01L from Wanhua Chemical.

[0027] The raw materials for preparing the intermediate quantum dot layer are quantum dot masterbatch and PMMA; the mass ratio of the quantum dot masterbatch and PMMA is 1:100; the PMMA of the intermediate quantum dot layer is Wanhua Chemical HD01L.

[0028] The raw materials for preparing the quantum dot-containing masterbatch are quantum dots and polymer A, and the polymer A is PMMA OD02 produced by Wanhua Chemical; the mass ratio of the quantum dots to polymer A is 1:100.

[0029] The raw materials for preparing the inner structural layer include a light diffuser and PMMA. The PMMA of the inner structural layer is HD01L from Wanhua Chemical. The light diffuser is a composite light diffuser, which is an organic silicon light diffuser and polymer B, with a mass ratio of 1:10. The polymer B is PMMA OD02 from Wanhua Chemical.

[0030] Organic silicon light diffuser, specifically HY-7000 spherical silicone resin micropowder from Hangzhou Yuheng Technology Co., Ltd.

[0031] The multi-layer co-extrusion injection-molded quantum dot diffusion plate is formed in one step by a multi-layer co-extrusion injection-molding process.

[0032] The present invention is further explained below in conjunction with specific implementation modes.

[0033] Example 1

[0034] This embodiment provides a multi-layer co-extrusion injection-molded quantum dot diffusion plate, which has three layers, from the outer layer to the inner layer, namely an outer transparent layer, a middle quantum dot layer, and an inner structural layer; and the thickness ratio of the three layers is 3:4:3.

[0035] Outer transparent layer:

[0036] The outer transparent layer is prepared from PMMA, HD01L from Wanhua Chemical.

[0037] Intermediate quantum dot layer:

[0038] The raw materials for preparing the intermediate quantum dot layer are quantum dot masterbatch and PMMA; the PMMA of the intermediate quantum dot layer is HD01L from Wanhua Chemical. The mass ratio of the quantum dot masterbatch to PMMA is 1:100;

[0039] The raw materials for preparing the quantum dot-containing masterbatch are quantum dots and polymer A, and the polymer A is PMMAOD02 produced by Wanhua Chemical. The mass ratio of the quantum dots to the polymer A is 1:100.

[0040] The preparation method of the quantum dots refers to

[0074] to

[0076] in patent CN118328333A.

[0041] The method for preparing the masterbatch containing quantum dots is a conventional method for preparing masterbatch.

[0042] Inner structure layer:

[0043] The raw materials for preparing the inner structural layer include a light diffuser and PMMA. The mass ratio of the light diffuser to PMMA is 1:1000; the PMMA of the inner structural layer is Wanhua Chemical HD01L. The light diffuser is a composite light diffuser, which is an organic silicon light diffuser and polymer B, and the mass ratio is 1:10. The polymer B is Wanhua Chemical PMMA OD02.

[0044] The preparation method of the light diffuser is a conventional method for preparing masterbatch.

[0045] Preparation method:

[0046] The multi-layer co-extrusion injection-molded quantum dot diffusion plate is formed in one step by a multi-layer co-extrusion injection molding process. Specifically, the three layers of prepared raw materials are mixed and dispersed evenly, and then extruded through screw 1, screw 2, and screw 3 according to a thickness ratio of 3:4:3. The temperature is set to 180°C, 190°C, 200°C, 210°C, 215°C, and 203°C, and then cooled and cut to obtain the diffusion plate.

[0047] Example 2

[0048] This embodiment provides a multi-layer co-extrusion injection-molded quantum dot diffusion plate, which has three layers, from the outer layer to the inner layer, namely an outer transparent layer, a middle quantum dot layer, and an inner structural layer; and the thickness ratio of the three layers is 3:4:3.

[0049] Outer transparent layer:

[0050] The outer transparent layer is prepared from PMMA, HD01L from Wanhua Chemical.

[0051] Intermediate quantum dot layer:

[0052] The raw materials for preparing the intermediate quantum dot layer are quantum dot masterbatch and PMMA; the PMMA of the intermediate quantum dot layer is Wanhua Chemical HD01L. The mass ratio of the quantum dot masterbatch to PMMA is 1:100;

[0053] The raw materials for preparing the quantum dot-containing masterbatch are quantum dots and polymer A, and the polymer A is HD01L produced by Wanhua Chemical; the mass ratio of the quantum dots to the polymer A is 1:100.

[0054] The preparation method of the quantum dots refers to

[0074] to

[0076] in patent CN118328333A.

[0055] The method for preparing the masterbatch containing quantum dots is a conventional method for preparing masterbatch.

[0056] Inner structure layer:

[0057] The raw materials for preparing the inner structural layer include a light diffuser and PMMA. The mass ratio of the light diffuser to PMMA is 1:1000; the PMMA of the inner structural layer is Wanhua Chemical HD01L. The light diffuser is a composite light diffuser, which is an organic silicon light diffuser and polymer B, and the mass ratio is 1:10. The polymer B is Wanhua Chemical HD01L.

[0058] The preparation method of the light diffuser is a conventional method for preparing masterbatch.

[0059] Preparation method:

[0060] The multi-layer co-extrusion injection-molded quantum dot diffusion plate is formed in one step by a multi-layer co-extrusion injection molding process. Specifically, the three layers of prepared raw materials are mixed and dispersed evenly, and then extruded through screw 1, screw 2, and screw 3 according to a thickness ratio of 3:4:3. The temperature is set to 180°C, 190°C, 200°C, 210°C, 215°C, and 203°C, and then cooled and cut to obtain the diffusion plate.

[0061] Example 3

[0062] This embodiment provides a multi-layer co-extrusion injection-molded quantum dot diffusion plate, which has three layers, from the outer layer to the inner layer, namely an outer transparent layer, a middle quantum dot layer, and an inner structural layer; and the thickness ratio of the three layers is 3:4:3.

[0063] Outer transparent layer:

[0064] The outer transparent layer is prepared from PMMA, HD01L from Wanhua Chemical.

[0065] Intermediate quantum dot layer:

[0066] The raw materials for preparing the intermediate quantum dot layer are quantum dot masterbatch and PMMA; the PMMA of the intermediate quantum dot layer is Wanhua Chemical HDO4. The mass ratio of the quantum dot masterbatch to PMMA is 1:100;

[0067] The raw materials for preparing the quantum dot-containing masterbatch are quantum dots and polymer A, and the polymer A is PMMAOD02 produced by Wanhua Chemical. The mass ratio of the quantum dots to the polymer A is 1:100.

[0068] The preparation method of the quantum dots refers to

[0074] to

[0076] in patent CN118328333A.

[0069] The method for preparing the masterbatch containing quantum dots is a conventional method for preparing masterbatch.

[0070] Inner structure layer:

[0071] The raw materials for preparing the inner structural layer include a light diffuser and PMMA. The mass ratio of the light diffuser to PMMA is 1:1000; the PMMA of the inner structural layer is Wanhua Chemical HD01L. The light diffuser is a composite light diffuser, which is an organic silicon light diffuser and polymer B, and the mass ratio is 1:10. The polymer B is Wanhua Chemical PMMA OD02.

[0072] The preparation method of the light diffuser is a conventional method for preparing masterbatch.

[0073] Preparation method:

[0074] The multi-layer co-extrusion injection-molded quantum dot diffusion plate is formed in one step by a multi-layer co-extrusion injection molding process. Specifically, the three layers of prepared raw materials are mixed and dispersed evenly, and then extruded through screw 1, screw 2, and screw 3 according to a thickness ratio of 3:4:3. The temperature is set to 180°C, 190°C, 200°C, 210°C, 215°C, and 203°C, and then cooled and cut to obtain the diffusion plate.

[0075] Example 4

[0076] This embodiment provides a multi-layer co-extrusion injection-molded quantum dot diffusion plate, which has three layers, from the outer layer to the inner layer, namely an outer transparent layer, a middle quantum dot layer, and an inner structural layer; and the thickness ratio of the three layers is 3:4:3.

[0077] Outer transparent layer:

[0078] The outer transparent layer is prepared from PMMA, HD01L from Wanhua Chemical.

[0079] Intermediate quantum dot layer:

[0080] The raw materials for preparing the intermediate quantum dot layer are quantum dot masterbatch and PMMA; the PMMA of the intermediate quantum dot layer is HD01L from Wanhua Chemical. The mass ratio of the quantum dot masterbatch to PMMA is 1:100;

[0081] The raw materials for preparing the quantum dot-containing masterbatch are quantum dots and polymer A, and the polymer A is PMMASF 01 produced by Wanhua Chemical. The mass ratio of the quantum dots to the polymer A is 1:100.

[0082] The preparation method of the quantum dots refers to

[0074] to

[0076] in patent CN118328333A.

[0083] The method for preparing the masterbatch containing quantum dots is a conventional method for preparing masterbatch.

[0084] Inner structure layer:

[0085] The raw materials for preparing the inner structural layer include a light diffuser and PMMA. The mass ratio of the light diffuser to PMMA is 1:1000; the PMMA of the inner structural layer is Wanhua Chemical HD01L. The light diffuser is a composite light diffuser, which is an organic silicon light diffuser and polymer B, with a mass ratio of 1:10. The polymer B is Wanhua Chemical PMMAOD02.

[0086] The preparation method of the light diffuser is a conventional method for preparing masterbatch.

[0087] Preparation method:

[0088] The multi-layer co-extrusion injection-molded quantum dot diffusion plate is formed in one step by a multi-layer co-extrusion injection molding process. Specifically, the three layers of prepared raw materials are mixed and dispersed evenly, and then extruded through screw 1, screw 2, and screw 3 according to a thickness ratio of 3:4:3. The temperature is set to 180°C, 190°C, 200°C, 210°C, 215°C, and 203°C, and then cooled and cut to obtain the diffusion plate.

[0089] Example 5

[0090] This embodiment provides a multi-layer co-extrusion injection-molded quantum dot diffusion plate, which has three layers, from the outer layer to the inner layer, namely an outer transparent layer, a middle quantum dot layer, and an inner structural layer; and the thickness ratio of the three layers is 3:4:3.

[0091] Outer transparent layer:

[0092] The outer transparent layer is prepared from PMMA, HD01L from Wanhua Chemical.

[0093] Intermediate quantum dot layer:

[0094] The raw materials for preparing the intermediate quantum dot layer are quantum dots and PMMA; the PMMA of the intermediate quantum dot layer is HD01L from Wanhua Chemical. The mass ratio of the quantum dots to PMMA is 1:10000;

[0095] The preparation method of the quantum dots refers to

[0074] to

[0076] in patent CN118328333A.

[0096] Inner structure layer:

[0097] The raw materials for preparing the inner structural layer include a light diffuser and PMMA. The mass ratio of the light diffuser to PMMA is 1:1000; the PMMA of the inner structural layer is Wanhua Chemical HD01L. The light diffuser is a composite light diffuser, which is an organic silicon light diffuser and polymer B, and the mass ratio is 1:10. The polymer B is Wanhua Chemical PMMA OD02.

[0098] The preparation method of the light diffuser is a conventional method for preparing masterbatch.

[0099] Preparation method:

[0100] The multi-layer co-extrusion injection-molded quantum dot diffusion plate is formed in one step by a multi-layer co-extrusion injection molding process. Specifically, the three layers of prepared raw materials are mixed and dispersed evenly, and then extruded through screw 1, screw 2, and screw 3 according to a thickness ratio of 3:4:3. The temperature is set to 180°C, 190°C, 200°C, 210°C, 215°C, and 203°C, and then cooled and cut to obtain the diffusion plate.

[0101] Performance Testing

[0102] Performance testing is carried out in accordance with corporate standard Q / GODM 2-2020.

[0103] Total light transmittance

[0104] In the process of the incident light flux leaving from the illuminated surface or the medium incident surface to the other side, the ratio of the radiant energy projected and passed through the object to the total radiant energy projected onto the object is called the transmittance of the object. The average value of the light transmittance of 380nm~750mm is the total light transmittance, represented by T.

[0105] Haze

[0106] A beam of parallel light from a standard "c" light source is vertically irradiated onto a transparent or translucent film, sheet, or plate. Due to scattering inside and on the surface of the material, part of the parallel light deviates from the incident direction by more than 2.5°. d and the luminous flux T transmitted through the material 2 The percentage of the ratio.

[0107] Test method: total light transmittance, haze, blue light removal rate test

[0108] The instruments and equipment are as follows: Spectrophotometer or similar equipment, which is required to be able to test the transmittance, haze and other parameters of the sample at a wavelength of 380nm to 750nm, and be able to test samples of specified thickness.

[0109] Sample preparation

[0110] The sample surface should not have defects such as bubbles, scratches, impurities, etc., and proceed as follows:

[0111] The sampling position should be at least 50mm away from the edge of the original plate; the length of the sample is 50mm~100mm, and the width is 50mm~100mm; remove the sample protective film, if the surface is dirty, clean the surface with anhydrous ethanol or other suitable solvents, and dry it naturally for use.

[0112] The test steps are as follows:

[0113] Start the instrument and connect it to the computer, open the test software, and initialize the instrument first; after initialization, perform a blank test without installing the sample, then place the test sample in the instrument, start the test, and obtain the light transmittance curve, data and haze results;

[0114] The average transmittance of the samples from 380nm to 420nm is taken as the blue light removal rate, %;

[0115] Take the average light transmittance of samples >380nm~750nm as the total light transmittance, %;

[0116] In the present invention, the haze requirement is 90% as the critical point, more than 90% is qualified, 85-90% is fair, and less than 85% is unqualified.

[0117] Brightness uniformity was determined by arranging four cold cathode tubes at intervals of 2 cm, fixing a light diffusion plate sample parallel to the plate at 10 mm, and visually observing the image. Uniform brightness was indicated by ○, and uneven brightness was indicated by ×.

[0118] Table 1 Test results of test 1 and test 2

[0119]

[0120] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multi-layer co-extrusion injection-molded quantum dot diffusion plate, characterized in that: The quantum dot diffusion plate has three layers, from the outer layer to the inner layer, which are an outer transparent layer, a middle quantum dot layer, and an inner structural layer; and the thickness ratio of the three layers is 3:4:3; The outer transparent layer is made of PMMA, and the PMMA of the outer transparent layer is HD01L from Wanhua Chemical; The raw materials for preparing the intermediate quantum dot layer are quantum dot masterbatch and PMMA; the PMMA of the intermediate quantum dot layer is Wanhua Chemical HD01L; the mass ratio of the quantum dot masterbatch to PMMA is 1:100; The raw materials for preparing the quantum dot-containing masterbatch are quantum dots and polymer A, and the polymer A is PMMAOD02 produced by Wanhua Chemical; the mass ratio of the quantum dots to the polymer A is 1:100; The raw materials for preparing the inner structural layer include a light diffuser and PMMA; the mass ratio of the light diffuser to PMMA is 1:1000; the PMMA of the inner structural layer is Wanhua Chemical HD01L; the light diffuser is a composite light diffuser, which is an organic silicon light diffuser and polymer B, with a mass ratio of 1:10; the polymer B is Wanhua Chemical PMMA OD02; The multi-layer co-extrusion injection-molded quantum dot diffusion plate is formed in one step by a multi-layer co-extrusion injection molding process. Specifically, the three layers of prepared raw materials are mixed and dispersed evenly, and then extruded through screw 1, screw 2, and screw 3 according to a thickness ratio of 3:4:

3. The temperature is set to 180°C, 190°C, 200°C, 210°C, 215°C, and 203°C, and then cooled and cut to obtain the diffusion plate.

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