CN-115933027-B - Quantum dot compound extrusion type diffusion plate and light-emitting device

Abstract

The invention discloses a quantum dot compound extrusion-type diffusion plate and a light-emitting device, wherein the quantum dot compound extrusion-type diffusion plate is provided with a light-in surface and a light-out surface, and comprises a first layer of structural layer to an N-th layer of structural layer which are sequentially laminated and combined, wherein at least two layers of the first layer of structural layer to the N-th layer of structural layer comprise high-molecular polymers, the quantum dot compound is dispersed in the high-molecular polymers, N is not less than 2, the quantum dot compound comprises quantum dots and a coating for coating the quantum dots, and the refractive index of the coating in the structural layer closest to the light-in surface is the smallest in the structural layer comprising the quantum dot compound. The light conversion rate of the quantum dot compound extrusion type diffusion plate can be effectively improved, and the light emitting brightness of the light emitting device is further improved.

Inventors

• MA BO
• LIU DONGQIANG
• LIU SIJIN
• WANG YUNJUN

Assignees

• 苏州星烁纳米科技有限公司

Dates

Publication Date

20260508

Application Date

20220507

Priority Date

20210923

Claims (8)

1. 1. The quantum dot compound extrusion type diffusion plate is characterized by comprising a light incident surface and a light emergent surface, and sequentially laminating and combining a first layer of structural layer to an N layer of structural layer from the light incident surface to the light emergent surface, wherein the first layer of structural layer to the N layer of structural layer comprise high molecular polymers, at least two layers of the first layer of structural layer to the N layer of structural layer comprise quantum dot compounds dispersed in the high molecular polymers, N is more than or equal to 2, and the quantum dot compounds consist of quantum dots and cladding materials cladding the quantum dots; The refractive index of the cladding in the structural layer closest to the light incident surface is the smallest in the structural layers comprising the quantum dot compound, the refractive index of the cladding is gradually increased from layer to layer in the first-to-N-th structural layers, and the refractive index of the cladding is 1.4-2.8.
2. 2. The quantum dot composite extrusion-type diffusion plate according to claim 1, wherein the quantum dot composite is 1-10wt% in each structural layer.
3. 3. The quantum dot composite extrusion-type diffusion plate according to claim 1, wherein the particle size of the quantum dot composite is 30-500 nm.
4. 4. The quantum dot composite extrusion diffuser plate of claim 1 wherein the coating is inorganic.
5. 5. The quantum dot composite diffusion plate according to claim 1, wherein the thickness of the quantum dot composite diffusion plate is 500 μm to 2mm.
6. 6. The quantum dot composite extrusion-type diffusion plate according to claim 1, wherein the high molecular polymer is at least one of polystyrene, polyethylene, polypropylene, polythiol, polyurethane, polymethyl methacrylate-styrene copolymer.
7. 7. The quantum dot composite extrusion-type diffusion plate according to claim 1, wherein N is 4, and the cladding of the quantum dot composite is silica, alumina, titania, zirconia in this order in the first to fourth structural layers.
8. 8. A light emitting device comprising the quantum dot composite extrusion diffuser plate of any one of claims 1-7.

Description

Quantum dot compound extrusion type diffusion plate and light-emitting device Technical Field The application belongs to the technical field of nanometer, and particularly relates to a quantum dot compound extrusion type diffusion plate and a light-emitting device. Background Quantum dots (also known as semiconductor nanocrystals) are novel semiconductor nanomaterials, ranging in size from 1-20nm, which possess unique Photoluminescence (PL) and Electroluminescence (EL) properties due to quantum size effects and dielectric confinement effects. Compared with the traditional organic fluorescent dye, the quantum dot has the excellent optical characteristics of high quantum efficiency, high photochemical stability, difficult photolysis, wide excitation, narrow emission, high color purity, fluorescent emission characteristic, capability of adjusting the composition, the particle size and the structure of the quantum dot and the like, and can lead a television to have high color gamut (NTSC), and wide application prospect in the technical field of display. The backlight module is a backlight module for providing backlight source in LCD display products, and generally comprises a backlight source, multiple layers of backlight materials and a supporting frame. The backlight quality determines important parameters such as brightness, emergent light uniformity, color gradation and the like of the liquid crystal display screen, and determines the luminous effect of the liquid crystal display screen to a great extent. The side light incidence type backlight module can be matched with the light emitting diode and the light guide plate, has the advantage of thinner thickness, and light emitted by the LED packaging light source enters the light guide plate and propagates towards the direction of the liquid crystal screen through reflection and scattering of the reflecting sheet and the mesh points. At present, the quantum dots are mainly dispersed in a medium and are arranged near the light incident surface or the light emergent surface of the light guide plate. The quantum dots are arranged near the light incident surface, the service life of the quantum dots is reduced due to the fact that the quantum dots are easily influenced by the temperature of a light source, the luminous brightness is low, the quantum dots are arranged near the light emergent surface, and the quantum dots are large in consumption, high in cost and thick in module. Therefore, it is necessary to further optimize the application of the quantum dots in the backlight module. Disclosure of Invention In view of the above technical problems, the present application provides a quantum dot composite extrusion-type diffusion plate, which has a light incident surface and a light emergent surface, and includes a first layer of structure layer to an nth layer of structure layer laminated and combined in sequence from the light incident surface to the light emergent surface, wherein the first layer of structure layer to the nth layer of structure layer each include a polymer, at least two of the first layer of structure layer to the nth layer of structure layer include a quantum dot composite dispersed in the polymer, N is greater than or equal to 2, and the quantum dot composite includes quantum dots and a coating for coating the quantum dots; Among the structural layers containing the quantum dot compound, the refractive index of the cladding in the structural layer closest to the light incident surface is the smallest. Further, in each structural layer, the weight percentage of the quantum dot compound is 1-10wt%; preferably, in the quantum dot compound, the weight percentage of the quantum dots is 10-30wt%. Further, the particle size of the quantum dot composite is 30-500 nm, preferably 50-300 nm. Further, the coating is an inorganic substance; preferably, the inorganic substance includes at least one of aluminum oxide, aluminum nitride, aluminum oxynitride, titanium oxide, titanium nitride, titanium oxynitride, zirconium oxide, zirconium nitride, zirconium oxynitride, silicon oxide, silicon carbide, silicon oxynitride, barium sulfate, zinc sulfide, and graphene. Further, the refractive index of the cladding increases from layer to layer in the first to nth structural layers. Further, the thickness of the quantum dot composite diffusion plate is 500 μm-2 mm. Further, the high molecular polymer is at least one of polystyrene, polyethylene, polypropylene, polythiol alkene, polyurethane, polymethyl methacrylate and polymethyl methacrylate-styrene copolymer. Further, the refractive index of the coating is 1.4-2.8. Further, N is 4, and the cladding of the quantum dot composite is silica, alumina, titania and zirconia in sequence in the first to fourth structural layers. The application also provides a light-emitting device comprising the quantum dot compound extrusion type diffusion plate. The quantum dot composite extrusion type diffusion plate has the beneficia