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Preparation method of blue fluorescent graphene quantum dots and application in white LED

A technology of graphene quantum dots and blue fluorescence, which is applied in the direction of graphene, chemical instruments and methods, and luminescent materials, can solve the problems of wide excitation spectrum range, reduced luminous efficiency, and short excitation light wavelength, and achieves a simple and reasonable preparation method , low preparation cost and short reaction time

Inactive Publication Date: 2018-01-09
苏州轻光材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Using ultraviolet LED as the excitation source with red and blue phosphors to prepare white LEDs, due to the radiation reabsorption between phosphors of different substrates, it will increase energy loss and reduce luminous efficiency, so single-phase phosphors excited by ultraviolet LEDs have become the mainstream development. trend; there are many reported UV LED-excited single-phase phosphors, such as a Chinese invention patent with application number CN106929011A that provides a white-light phosphor excited by UV LEDs, whose general chemical formula is M 1-x-y- z SM x Tb y T m z AlSiN 3-2(x+y+z) / 2 , wherein: M is at least one of Ca, Sr, and Ba, 0.001≤x≤0.2, 0.001≤y≤0.1, 0.001≤z≤0.2, and the white light phosphor can emit White light with short excitation wavelength and wide excitation spectrum

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh 10mg of graphene oxide powder and dissolve it in 8ml of deionized water, add 8ml of 5% hydrogen peroxide, move it to a polytetrafluoroethylene-lined stainless steel reactor and seal it, and react with 155°C for 50min to obtain blue fluorescent graphite Graphene quantum dot solution, after cooling, transferred to a dialysis bag with a molecular weight of 3500Da, dialyzed 3 times in 500mL ultrapure water containing 100mg manganese dioxide, and dialyzed for 2h each time, and prepared the blue fluorescent graphene quantum dots Glue to obtain blue fluorescent glue, and yellow fluorescent powder is prepared in the same way to obtain yellow fluorescent glue. The ultraviolet light source is made by connecting the ultraviolet LED chip to the substrate. Obtain an ultraviolet excitation white light LED lamp; the optimal UV excitation wavelength of the blue fluorescent graphene quantum dot described in the present embodiment is 360nm, and the maximum emission peak is at 420nm,...

Embodiment 2

[0024] Weigh 20mg of graphene oxide powder and dissolve it in 20ml of deionized water, add 10ml of 25% hydrogen peroxide, move it to a polytetrafluoroethylene-lined stainless steel reactor and seal it, and react with 165°C for 60min to obtain blue fluorescent graphite The alkene quantum dot solution was transferred to a dialysis bag with a molecular weight of 3500Da after cooling, and dialyzed 5 times in 2L ultrapure water containing 300 mg of manganese dioxide, each time for 4 hours. The blue fluorescent graphene quantum dots are glued together to obtain blue fluorescent glue, and the yellow fluorescent powder is glued according to the same method to obtain yellow fluorescent glue. The ultraviolet light source is made by connecting an ultraviolet LED chip to a substrate. The fluorescent glue is arranged and coated on the ultraviolet LED chip at intervals to obtain an ultraviolet-excited white light LED lamp; the optimal UV excitation wavelength of the blue fluorescent graphene...

Embodiment 3

[0026] Weigh 10mg of graphene oxide powder and dissolve it in 10ml of deionized water, add 10ml of 15% hydrogen peroxide, move it to a polytetrafluoroethylene-lined stainless steel reactor and seal it, and react with 160°C for 55min to obtain blue fluorescent graphite The alkene quantum dot solution was transferred to a dialysis bag with a molecular weight of 3500Da after cooling, and dialyzed 4 times in 1L ultrapure water containing 100 mg of manganese dioxide, each time for 3 hours. The blue fluorescent graphene quantum dots are glued together to obtain blue fluorescent glue, and the yellow fluorescent powder is glued according to the same method to obtain yellow fluorescent glue. The ultraviolet light source is made by connecting an ultraviolet LED chip to a substrate. The fluorescent glue is arranged and coated on the ultraviolet LED chip at intervals to obtain an ultraviolet excited white light LED lamp; the optimal UV excitation wavelength of the blue fluorescent graphene...

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Abstract

The invention belongs to the technical field of white emitting phosphor of LED lamps and in particular relates to a preparation method of blue fluorescent graphene quantum dots and an application in awhite LED. The preparation method is simple, reasonable, low in preparation cost, mild in reaction conditions, short in reaction time and short in production cycle; with the adoption of inorganic peroxide hydrogen peroxide, any impurity ion is not introduced, excessive hydrogen peroxide can be removed by adopting a manganese dioxide catalyst, and the method is simple, capable of completely removing the excessive hydrogen peroxide, environment-friendly and pollution-free; and the graphene quantum dots can emit blue fluorescence and have stable light-emitting properties.

Description

technical field [0001] The invention belongs to the technical field of white light fluorescent powder for LED lamps, and in particular relates to a method for preparing blue fluorescent graphene quantum dots and their application in white light LEDs. Background technique [0002] In recent years, with the gradual improvement of light-emitting diode (LED) luminous efficiency and the gradual decline of cost, LED, as a new type of blue and environmentally friendly solid-state lighting source, is a solid-state semiconductor material that can convert electrical energy into visible light. Compared with other light sources, LED has the advantages of energy saving, safety, long life, low energy consumption, less heat generation, high brightness, waterproof, shockproof, easy dimming, concentrated beam, and convenient maintenance. It has become an inevitable trend in the development and future of modern lighting. Trend, white LED is called "21st century blue light source". [0003] A...

Claims

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Application Information

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IPC IPC(8): C09K11/65H01L33/50H01L33/26B82Y40/00C01B32/184
CPCY02B20/00
Inventor 马必鹉董安钢张家奇夏浩孚陈延兵
Owner 苏州轻光材料科技有限公司
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