Photonic crystal assembled by fluorescent microspheres and preparation method and application thereof

A fluorescent microsphere and photonic crystal technology, applied in chemical instruments and methods, luminescent materials, semiconductor devices, etc., can solve the problem of difficulty in ensuring the consistency of LED photometric and chromaticity, difficult to control the thickness and uniformity of fluorescent powder glue, and affecting the use of LEDs. lifespan and other issues

Active Publication Date: 2016-11-23
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 prepar

Method used

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  • Photonic crystal assembled by fluorescent microspheres and preparation method and application thereof
  • Photonic crystal assembled by fluorescent microspheres and preparation method and application thereof
  • Photonic crystal assembled by fluorescent microspheres and preparation method and application thereof

Examples

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[0063] Example 1

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

[0065] Dissolve 6 ml of ammonia in water, add ethanol to make the total amount of trifoliate 50 ml, place it in a three-necked flask and stir at 25°C for 15 minutes, then measure 4.5 ml of ethyl orthosilicate (TEOS) and dissolve in 45.5 ml of ethanol. The ethanol solution of ethyl orthosilicate is added to the ammonia solution to keep the reaction system sealed and fully reacted for 24 hours. The obtained product was centrifuged, and the particles were washed three times with absolute ethanol and distilled water, and placed in a vacuum drying oven at 50 ℃ 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) are re-dispersed in methanol, and the concentration of silica is 2.5 wt%. Then add 3-aminopropyltriethoxysilane APTMS (mass accounts for SiO 2 5wt%), the sol...

Example Embodiment

[0077] Example 2

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

[0079] Measure 15 ml of cyclohexane and place it in a three-necked flask. Under the condition of magnetic stirring, add 3.6 ml of surfactant (Triton X-100) and a certain amount of co-surfactant (n-hexanol, normal Octanol or n-heptanol), keep its concentration at 1.15 mol / L, stir vigorously at 30 ℃ for 5 min, then add a certain amount of distilled water to it, and continue to stir for 30 min to form a water-in-oil reverse phase micro Lotion. Under the condition of constant temperature and stirring, add 0.6 mL of ammonia and 0.6 ml of TEOS to the system, fully react for 24 h, add 30 ml of acetone to demulsify and terminate the reaction. After standing for a period of time, the resulting product is heated at 15000 rpm. After centrifugal separation under the conditions, the microspheres were washed three times with absolute ethanol and distilled water, and placed in a vacuum drying oven at 50 ℃ for 24 h to ...

Example Embodiment

[0090] Example 3

[0091] (1) Monodisperse silica particles are purchased directly, the monodispersity is below 3%, and the particle size is 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: re-disperse the silica particles in methanol, and the concentration of silica is 5wt%. Then add aminosilane (10wt% for SiO 2 ), the solution was heated at reflux overnight, centrifuged, 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 silica concentration 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 octadecylamine...

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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 three-primary color quantum dots embedded in monodisperse particles to obtain fluorescent microspheres assembled into photonic crystals, and the application of the photonic crystals in white light emitting diodes. Background technique [0002] Facing the depletion of petroleum resources, sustainable development and environmental protection requirements, the development of a new generation of high-efficiency, energy-saving and environmentally friendly light source technology is an urgent task that people need to solve. Semiconductor quantum dots have the characteristics of narrow light-emitting 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 Potenti...

Claims

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Application Information

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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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