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Fluorescent microspheres assembled into photonic crystals, its preparation method and application

A technology of fluorescent microspheres and photonic crystals, applied in chemical instruments and methods, luminescent materials, semiconductor devices, etc., can solve problems such as slow precipitation of fluorescent materials, performance degradation of fluorescent materials, and affecting the service life of LEDs

Active Publication Date: 2018-10-09
苏州古廷玉新型环保材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Our previous patent CN201310278799.6 has already involved the use of photonic crystals to increase the intensity of white light. However, since the fluorescent material is coated on the surface or gap of the photonic crystal and directly contacts the LED chip, the heat generated by the chip during operation will reduce the performance of the fluorescent material. Causes the light source light stability to deteriorate, and then affects the service life of the LED
In addition, in the process of preparing light-emitting diodes, due to the difference in density between the fluorescent material and the light-curing adhesive, the fluorescent material will slowly precipitate in the colloid, making it difficult to ensure the consistency of LED luminosity and chromaticity. It is difficult to control the thickness and uniformity of LED products, resulting in inconsistent angular distribution of light intensity of different LED products. The above problems limit its practical application and development.

Method used

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  • Fluorescent microspheres assembled into photonic crystals, its preparation method and application
  • Fluorescent microspheres assembled into photonic crystals, its preparation method and application
  • Fluorescent microspheres assembled into photonic crystals, its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] (1) Preparation of monodisperse silica particles:

[0065] Dissolve 6 ml of ammonia water in water, add ethanol to make the total trifoliate orange to 50 ml, place in a three-necked bottle and stir at 25°C for 15 minutes, then measure 4.5 ml of tetraethyl orthosilicate (TEOS) and dissolve in 45.5 ml of ethanol. Add the ethanol solution of ethyl orthosilicate to the ammonia solution to keep the reaction system sealed and fully react for 24 hours. The resulting product was centrifuged, and the particles were washed three times with absolute ethanol and distilled water, and placed in a vacuum oven at 50 °C for 24 h to obtain silica particles.

[0066] (2) Preparation of fluorescent microspheres

[0067] (a) Surface modification of monodisperse silica particles: the silica particles obtained in step (1) were redispersed in methanol, and the concentration of silica was 2.5 wt%. Then add 3-aminopropyltriethoxysilane APTMS (mass accounted for SiO 2 5 wt %), the solution was...

Embodiment 2

[0078] (1) Preparation of monodisperse silica particles:

[0079] Measure 15 ml of cyclohexane into a three-necked flask, add 3.6 ml of surfactant (Triton X-100) and a certain amount of co-surfactant (n-hexanol, n- Octanol or n-heptanol), keep its concentration at 1.15 mol / L, stir vigorously at 30 °C for 5 min, then add a certain amount of distilled water to it, and continue stirring for 30 min to form a water-in-oil reverse phase microsphere. lotion. Under the condition of constant temperature and stirring, add 0.6mL of ammonia water and 0.6ml of TEOS to the system. After fully reacting for 24 hours, add 30ml of acetone to break the emulsification and terminate the reaction. The microspheres were centrifuged under the conditions, and the microspheres were washed three times with absolute ethanol and distilled water, and placed in a vacuum oven at 50 °C for 24 h to obtain silica particles.

[0080] (2) Preparation of fluorescent microspheres

[0081] (a) Surface modificatio...

Embodiment 3

[0091] (1) Monodisperse silica particles are purchased directly, with a monodispersity of less than 3% and a particle size of 150-200 nm. Monodisperse silica particles with a particle size of 160 nm are selected as seeds.

[0092] (2) Preparation of fluorescent microspheres

[0093] (a) Surface modification of monodisperse silica particles: The silica particles were redispersed in methanol with a silica concentration of 5 wt%. Then add aminosilane (10wt % for SiO 2 ), the solution was heated under reflux overnight, centrifuged, and the obtained powder was washed 2-3 times with methanol and deionized water, and finally dispersed in ethanol to obtain an amino-modified silica solution. The concentration of silica was 2%. The hydrochloric acid solution adjusts the pH value of the amino-modified silica solution so that the pH value is around 4.

[0094] (b) Surface modification of quantum dots: Red, green, and blue quantum dots CdSe / ZnS (purchased from Adrich) modified by octadec...

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Abstract

The invention belongs to the technical field of organic photo-functional materials. A photonic crystal assembled by fluorescent microspheres obtained after three-primary-color quantum dots are embedded into particles is characterized by being assembled by the mono-dispersed fluorescent microspheres through a self-assembly method, wherein the fluorescent microspheres comprise mono-dispersed particle kernels and shells which are made of silicon dioxide materials and have uniform thickness, a layer of quantum dots are evenly dispersed on the outer surfaces of the particles through the static effect, the layer of quantum dots are formed by mixing red quantum dots, green quantum dots and blue quantum dots in proportion, and the photonic crystal can be applied to white light emitting diodes.

Description

technical field [0001] The invention relates to the technical field of organic optical functional materials, in particular to a photonic crystal obtained by embedding three primary color quantum dots into monodisperse particles to obtain fluorescent microspheres, and the application of the photonic crystal in white light emitting diodes. Background technique [0002] Facing the depletion of oil resources, sustainable development and environmental protection requirements, it is an urgent task to develop a new generation of high-efficiency, energy-saving and environment-friendly light source technology. Semiconductor quantum dots have the characteristics of narrow luminescent line width, high photoluminescence efficiency, and quantum dots of different sizes can be excited by a single wavelength of light to emit light of different colors. Therefore, light-emitting diodes with quantum dots as the light-emitting layer are extremely Potential next-generation display and solid-stat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/02C09K11/88H01L33/50
CPCC09K11/025C09K11/88C09K11/883H01L33/502Y02B20/00
Inventor 李珩徐朝华
Owner 苏州古廷玉新型环保材料有限公司
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