CN-118344771-B - Quantum dot ink, quantum dot light conversion element and display device

Abstract

The invention relates to the technical field of ink-jet printing, and discloses quantum dot ink which comprises quantum dots, siloxane, a reactive coupling agent containing C=C bonds and Si-O bonds, wherein the surface of the quantum dots is provided with an organic chain segment, and the organic chain segment is linked with a photo-curable active functional group. According to the quantum dot ink, siloxane is added into the quantum dot ink, the siloxane generates polysiloxane microspheres through chemical reaction in the process of ink-jet printing and curing film forming, the polysiloxane microspheres can serve as a light dispersing agent, and the optical performance of the quantum dot ink is improved, so that in a quantum dot light conversion element, the polysiloxane microspheres can scatter light of backlight blue light, reduce transmitted blue light, enable more blue light to be absorbed by the quantum dot, and improve the light-emitting brightness of the quantum dot light conversion element, and the addition of the reactive coupling agent enables the dispersibility of the quantum dot and the formed polysiloxane microspheres in the ink to be good, so that the roughness of the film surface of the quantum dot light conversion element is reduced.

Inventors

• MA BO
• ZHANG SIYUAN
• WU JINGFEI
• LI JINGQUN
• HUANG LONG
• WANG YUNJUN

Assignees

• 苏州星烁纳米科技有限公司

Dates

Publication Date

20260508

Application Date

20231215

Claims (9)

1. 1. The quantum dot ink is characterized by comprising quantum dots, siloxane, a reactive coupling agent containing C=C bonds and Si-O bonds and an acrylic monomer, wherein an organic chain segment is arranged on the surface of each quantum dot, the organic chain segment is linked with a photo-curable active functional group, the reactive coupling agent can be connected with the siloxane and the photo-curable active functional group, the photo-curable active functional group comprises a substituted or unsubstituted propenyl group, the reactive coupling agent comprises an unsaturated silane coupling agent, and the organic chain segment is at least one of pentaerythritol tetra (3-mercaptopropionate), pentaerythritol tetra (3-mercaptobutyrate) and tris [2- (3-mercaptopropionyloxy) ethyl ] isocyanurate.
2. 2. The quantum dot ink of claim 1, further comprising a photoinitiator, a polymerization inhibitor.
3. 3. The quantum dot ink of claim 1, wherein the unsaturated silane coupling agent is selected from one of methyl vinyl dimethoxy silane, methacryloxyethoxy trimethyl silane, methacryloxypropyl tris (trimethylsiloxy) silane, γ -methacryloxypropyl trimethoxy silane, 1-methoxy-2-methyl-1- (trimethylsiloxy) propene, 3- (methacryloxy) propyl trimethoxy silane, 3- (methacryloxy) propyl tris (trimethylsiloxy) silane, 3- (methacryloxy) propyl trimethoxy silane, 3-methacryloxypropyl triethoxy silane, vinyl trimethoxy silane, vinyl tris (b-methoxyethoxy) silane, vinyl triethoxy silane, vinyloxy trimethyl silane, vinyl dimethyl ethoxy silane, vinyl tris (2-methoxyethoxy) silane, divinyl tetramethyl disiloxane.
4. 4. The quantum dot ink of claim 1, wherein the siloxane is selected from at least one of dodecyl triethoxysilane, cyclohexyl ethoxysilane, octaphenyl cyclotetrasiloxane, dimethyl cyclosiloxane, methyl silsesquioxane, tetramethyl cyclotetrasiloxane, octamethyl cyclotetrasiloxane, tetraethoxysilane, aminopropyl-containing siloxane, isocyanatosiloxane, allyl silsesquioxane, tetradecyl dihydroxy heptasiloxane, methyl vinyl cyclosiloxane, methylphenyl cyclosiloxane, trifluoropropyl methyl cyclotrisiloxane, methyl-3, 5-trifluoropropyl siloxane, phenyl silsesquioxane, methyl siloxane.
5. 5. The quantum dot ink of claim 1, wherein the weight percent of the organic segment in the quantum dot is 5-80wt%.
6. 6. The quantum dot ink of claim 2, wherein the acrylate monomer comprises at least one of a monofunctional acrylate monomer, a multifunctional acrylate monomer, or an oligomeric acrylate monomer.
7. 7. The quantum dot ink according to claim 2, wherein in the quantum dot ink, the content of the quantum dot is 10-30wt%, the content of the siloxane is 10-30wt%, the content of the reactive coupling agent is 5-15wt%, the content of the acrylate monomer is 10-90wt%, the content of the photoinitiator is 1-10wt%, and the content of the polymerization inhibitor is 1-5wt%.
8. 8. A quantum dot light conversion element prepared from the quantum dot ink of any one of claims 1-7.
9. 9. A display device comprising the quantum dot light converting element according to claim 8.

Description

Quantum dot ink, quantum dot light conversion element and display device Technical Field The invention belongs to the technical field of ink-jet printing, and particularly relates to quantum dot ink, a quantum dot light conversion element and a display device. Background The quantum dots (also called semiconductor nanocrystals) are novel semiconductor nanomaterials with the size of 1-10nm. They have unique Photoluminescence (PL) and Electroluminescent (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 yield, high photochemical stability, difficult photolysis, wide excitation, narrow emission, high color purity, adjustable luminescent color by controlling the size of luminescent nano particles and the like, and has wide application prospect in the technical field of display, wherein the quantum dot light conversion film is one of the application modes with the highest current attention, and becomes a research hot spot. At present, a quantum dot light conversion element is generally prepared by adopting an inkjet printing process, and the technical advantage of the inkjet printing process is that the dripping position and the volume of quantum dot ink can be controlled, so that a film can be printed. The existing quantum dot ink is prepared by dissolving quantum dots in a resin system, and the quantum dot ink is prepared into a quantum dot light conversion element through steps of printing, curing and the like. In order to increase the optical performance, light diffusion particles are generally added into the quantum dot ink, and the printing of the quantum dot ink is not smooth due to the large particle size of the light diffusion particles, even if the light diffusion particles are dispersed in the ink, the light diffusion particles are easy to settle in a short time, and the spray head is blocked. Therefore, development of a quantum dot ink with smooth printing, high luminous efficiency and good stability is needed. Disclosure of Invention Accordingly, the present invention is directed to a quantum dot ink, a quantum dot light conversion element, and a display device, which can obtain a quantum dot light conversion element having high optical performance and a flat film surface without adding light diffusion particles into the ink. According to a first aspect of the present invention, there is provided a quantum dot ink comprising a quantum dot, a siloxane, a reactive coupling agent comprising c=c bonds and si—o bonds, the quantum dot surface having an organic segment linked with a photocurable active functional group, the reactive coupling agent being capable of linking with the siloxane and the photocurable active functional group. According to the invention, siloxane is added into the quantum dot ink, the siloxane generates polysiloxane microspheres through chemical reaction in the process of ink jet printing and curing film forming, the polysiloxane microspheres can be used as a light dispersing agent, and the optical performance of the quantum dot ink is improved, so that in a quantum dot light conversion element prepared from the quantum dot ink, the polysiloxane microspheres can scatter light of backlight blue light, reduce transmitted blue light and enable more blue light to be absorbed by the quantum dots, thereby improving the light-emitting brightness of the quantum dot light conversion element, after the quantum dot ink is cured, the siloxane reacts to generate the polysiloxane microspheres with light diffusion effect, no light diffusion particles are required to be added into the ink, the polysiloxane microspheres are organic matters, the density is small, the sedimentation is difficult, the problems of easiness in sedimentation, difficulty in storage, difficulty in blocking a spray nozzle and the like of the quantum dot ink due to the addition of the light diffusion particles are avoided, and meanwhile, the light-emitting brightness of the quantum dot light conversion element can be remarkably improved. In addition, the reactive coupling agent containing C=C bonds and Si-O bonds is added into the quantum dot ink, and the organic chain segment on the surface of the quantum dot is linked with the photo-curable active functional group, so that the photo-curable active functional group is crosslinked with the C=C bonds of the coupling agent, the Si-O bonds form chemical bond connection with siloxane, the dispersibility of the quantum dot and the formed polysiloxane microsphere in the ink is good, and the roughness of the film surface of the quantum dot light conversion element prepared from the quantum dot ink is reduced. As a preferable scheme of the quantum dot ink, the quantum dot ink further comprises an acrylic monomer; Preferably, a photoinitiator is also included; Preferably, a polymerization inhibitor is also included. The acrylate