Up-converting light-diffusing microspheres for flat panel display and preparation method thereof

A flat-panel display and light conversion technology, which is applied in the preparation of microspheres and microcapsule preparations, can solve the problem of poor mechanical properties and flame retardancy of the light-diffusing film, the inability to realize the multi-functionality of the light-diffusing film, and the shape and size of the light-diffusing agent. Uncontrollable and other problems, to achieve strong up-conversion luminous performance, good application prospects, and multi-functional effects

Active Publication Date: 2019-04-30
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Chinese patent 201310101155.X discloses a light-diffusing agent for acrylic light-diffusing plates and its preparation method. The light-diffusing agent is styrene and methacryloxypropyl isobutyl cage-type oligomeric silsesquioxane random copolymer, but the polymerization reaction is difficult to control, and the shape and size of the obtained light diffusing agent are uncontrollable, resulting in poor diffusion effect of the light diffusing plate; Chinese patent 201510628802.1 discloses a preparation method of a styrene-based light diffusing Polymerization, styrene, divinylbenzene, ethylene glycol methacrylate, trimethylsilyl methacrylate, and chlorotrifluoroethylene are polymerized to obtain a styrene-based light diffusing agent. Although the invention The uniform dispersion of the light diffusing agent is achieved, but the mechanical properties and flame retardancy of the prepared light diffusing film are poor; Chinese patent 201610019716.5 discloses a modified amino resin light diffusing agent and its preparation method. After the end-capping agent reacts to eliminate the surface groups, the refractive index regulator is coated. Although this patent has the advantage of adjustable refractive index, the structure of the diffusing agent is single, and the range of refractive index adjustment is narrow, so it is impossible to realize the multifunctionality of the light diffusion film.
[0005] Current for upconversion materials and g-C 3 N 4 The research is concentrated in their respective research fields, and the report of combining the two as a light diffusing agent has never been seen.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] At 25°C, mix 0.14mol magnesium nitrate, 1.02g composite precipitant (the mass ratio of ammonium bicarbonate, cetyltrimethylammonium bromide, and sodium hydroxide is 1:2:0.5), 4mmol ErCl 3 ·H 2 0. Add 60mL distilled water into the reaction kettle and mix evenly, heat up to 150°C after ultrasonic dispersion for 1h, hydrothermally react for 8h, filter after cooling down to room temperature, wash with 100mL distilled water and 60mL absolute ethanol each time, wash 3 times, at 90 Dry at ℃ for 12h to get Er 2 o 3 - MgO microspheres.

[0033] After mixing 1.5g of melamine with 50mL of absolute ethanol, add 4g of the above-prepared Er 2 o 3 -MgO microspheres, stirred at 25°C for 8h, evaporated ethanol under reduced pressure, dried the solid at 60°C for 10h, and calcined at 550°C for 4h in an air atmosphere, the porous g-C 3 N 4 / Er 2 o 3 -MgO composite microspheres.

[0034] At 25°C, 0.01mol N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane, 80mL distilled water, 10g urea...

Embodiment 2

[0037] At 25°C, mix 0.14mol magnesium nitrate, 1g composite precipitant (the mass ratio of ammonium bicarbonate, cetyltrimethylammonium bromide, and sodium hydroxide is 1:3:0.5), 3mmol Er(NO 3 ) 3 ·5H 2 0, 50mL distilled water, add to the reaction kettle and mix evenly, heat up to 160°C after ultrasonic dispersion for 0.5h, hydrothermally react for 6h, filter after cooling down to room temperature, wash with 100mL distilled water and 60mL absolute ethanol each time, wash 4 times, in Dry at 80°C for 24h to get Er 2 o 3 - MgO microspheres.

[0038] After mixing 3g of dicyandiamide with 80mL of absolute ethanol, add 5g of Er prepared above 2 o 3 -MgO microspheres, stirred at 25°C for 6h, evaporated the ethanol under reduced pressure, dried the obtained solid in vacuum at 70°C for 9h, and calcined at 600°C for 3h in an air atmosphere, the porous g-C 3 N 4 / Er 2 o 3 -MgO composite microspheres.

[0039] At 25°C, 0.012mol N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane, 85m...

Embodiment 3

[0042] At 25°C, 0.14mol magnesium nitrate, 1.03g composite precipitant (the mass ratio of ammonium bicarbonate, cetyltrimethylammonium bromide, and sodium hydroxide is 1:3:1.5), 60mL distilled water, 4 mmol ErCl 3 ·H 2 O, add to the reaction kettle and mix well, heat up to 140°C after ultrasonic dispersion for 1.5h, hydrothermal reaction for 5h, filter after cooling down to room temperature, wash with 55mL distilled water and 40mL absolute ethanol each time, wash 3 times, at 100°C Dry for 10h to get Er 2 o 3 - MgO microspheres.

[0043] After mixing 3 g of melamine with 90 mL of absolute ethanol, add 6 g of Er prepared above 2 o 3 - MgO microspheres, after stirring at 25°C for 10h, evaporate the ethanol under reduced pressure, dry the obtained solid in vacuum at 50°C for 9h, and calcined at 450°C for 6h in an air atmosphere, the porous g-C 3 N 4 / Er 2 o 3 -MgO composite microspheres.

[0044] At 25°C, 0.01mol N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane, 80mL disti...

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Abstract

The invention discloses an up-conversion light diffusion micro-sphere for panel display and a preparation method thereof. The light diffusion micro-sphere is of a multi-shell structure and is microscopically of a "sandwich" structure. Erbium and magnesium bimetal composite oxide Er2O3-MgO micro-spheres are arranged on the innermost layer, and the average diameter of the micro-spheres is 2-4 μm; porous g-C3N4 is arranged on intermediate layers, and the thicknesses of the intermediate layers are 100-200 nm; polysiloxane condensation polymers are arranged on the outermost layer, and the thickness of the outermost layer is 400-600 nm. The light diffusion micro-sphere is prepared by: firstly growing a layer of porous g-C3N4 on each Er2O3-MgO micro-sphere in an in-situ manner to prepare porous g-C3N4 / Er2O3-MgO composite micro-spheres, and then hydrolyzing, condensing and polymerizing siloxane monomers on the composite micro-spheres in an in-situ manner, the panel display up-conversion light diffusion micro-sphere has up-conversion luminescence phenomena, and green light can be generated by the panel display up-conversion light diffusion micro-sphere excited by laser devices with the wavelengths of 980 nm. Excellent light diffusion effects can be realized by light diffusion films prepared from the panel display up-conversion light diffusion micro-sphere by means of ultraviolet curing, the visible light transmittance of the light diffusion films is 90%-95%, the haze of the light diffusion films is 80%-88%.

Description

technical field [0001] The invention relates to an up-conversion light-diffusing microsphere for flat panel display and a preparation method thereof, which belongs to the technical field of photoelectric functional materials and can be applied to the preparation of light-diffusion and up-conversion light-emitting two-in-one optical films. Background technique [0002] As a new type of light-emitting material, LED is widely used in automotive lighting, signal indicator lights, outdoor display screens, and indoor and outdoor lighting. However, because LED itself is a point light source, it will cause problems such as glare and narrow lighting area. Add light diffusion material to the resin to solve the problem. Light-diffusing material refers to an optical material with a certain light transmittance and haze. Through the difference between its own refractive index and the matrix resin, the point light source and line light source can be converted into line light source and sur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J13/02B01J13/14C08G77/26C08G77/28
CPCB01J13/02B01J13/14C08G77/26C08G77/28
Inventor 周钰明钟熙胡金刚何曼卜小海
Owner SOUTHEAST UNIV
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