Fluorescent carbon quantum dot composite light-emitting material, preparation method therefor and application on LED

A technology of carbon quantum dots and luminescent materials, which is applied in the fields of fluorescent carbon quantum dot composite luminescent materials and its preparation and application in LEDs. problems, and achieve the effects of low cost, short production cycle and simple preparation process

Active Publication Date: 2015-12-02
中农工科(成都)农业发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the above reports, a single carbon quantum dot fluorescent powder emits light. Compared with the traditional rare earth fluorescent powder, its luminous intensity is greatly weakened. Moreover, due to the lack of red components in the spectrum, its color rendering index and luminous efficiency are not good. high
[0005] At present, blue light chips plus yellow phosphors that can be efficiently excited by blue light are the easiest way to achieve white light, but there is also the problem of a serious lack of red and green light in the mixed white light.

Method used

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  • Fluorescent carbon quantum dot composite light-emitting material, preparation method therefor and application on LED
  • Fluorescent carbon quantum dot composite light-emitting material, preparation method therefor and application on LED
  • Fluorescent carbon quantum dot composite light-emitting material, preparation method therefor and application on LED

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Embodiment 1

[0059] (1) Preparation of silane-functionalized fluorescent carbon quantum dots: under nitrogen protection, preheat 100mL of N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane in vacuum to 240°C and perform magnetic Stir. 4 g of anhydrous citric acid was quickly added to the above solution, and after constant temperature reaction for 5 minutes, it was taken out and cooled to room temperature. The crude product was purified three times with petroleum ether to obtain a silane-functionalized fluorescent carbon quantum dot solution.

[0060] (2) Fluorescent carbon quantum dots / CaAl 12 o 19 :Mn 4+ Preparation of fluorescent powder composite luminescent material: Weigh 0.005 g of the silane-functionalized carbon quantum dot solution prepared in step (1), add 1 mL of absolute ethanol, and adjust the pH to 6.5 with 2 mol / L hydrochloric acid solution. Then add 8 mL of ethyl orthosilicate, absolute ethanol, distilled water, 2mol / L hydrochloric acid mixed solution, ethyl orthosilicate: ab...

Embodiment 2

[0070] (1) Preparation of silane-functionalized fluorescent carbon quantum dots: under the condition of nitrogen protection, preheat 100mL N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane in vacuum to 180°C and carry out Magnetic stirring. 1 g of anhydrous citric acid was quickly added to the above solution, and after constant temperature reaction for 10 minutes, it was taken out and cooled to room temperature. The crude product was purified three times with petroleum ether to obtain a silane-functionalized fluorescent carbon quantum dot solution.

[0071] (2) Fluorescent carbon quantum dots / Sr 2 Si 5 N 8 :Eu 2+ Preparation of fluorescent powder composite luminescent material: Weigh 0.01 g of the silane-functionalized carbon quantum dot solution prepared in step (1), add 1 mL of absolute ethanol, and adjust the pH to 4.0 with 2 mol / L hydrochloric acid solution. Then add 3 mL of ethyl orthosilicate, absolute ethanol, distilled water, 2mol / L hydrochloric acid mixed solution, e...

Embodiment 3

[0075] (1) Preparation of silane-functionalized fluorescent carbon quantum dots: under the condition of nitrogen protection, preheat 100mL N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane in vacuum to 250°C and carry out Magnetic stirring. 7 g of anhydrous citric acid was quickly added to the above solution, and after constant temperature reaction for 30 minutes, it was taken out and cooled to room temperature. The crude product was purified three times with petroleum ether to obtain a silane-functionalized fluorescent carbon quantum dot solution.

[0076] (2) Fluorescent carbon quantum dots / 3.5MgO·0.05MgF 2 · GeO 2 :Mn 4+ Preparation of fluorescent powder composite luminescent material: Weigh 1 g of the silane-functionalized carbon quantum dot solution prepared in step (1), add 5 mL of absolute ethanol, and adjust the pH to 7.0 with 2 mol / L hydrochloric acid solution. Then add 20mL of ethyl orthosilicate, dehydrated alcohol, distilled water, 2mol / L hydrochloric acid mixed so...

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Abstract

The invention belongs to the field of composite functional material, and discloses a fluorescent carbon quantum dot composite light-emitting material, a preparation method therefor and application on LED. The fluorescent carbon quantum dot composite light-emitting material is prepared by the following method: (1) preheating an organic silane compound with stirring, adding an organic acid to react, and cooling to obtain a silane functionalized fluorescent carbon quantum dot solution; and (2) weighing the silane functionalized fluorescent carbon quantum dot solution, adding absolute ethyl alcohol, adding acid to adjust PH to 4.0-7.0, adding a silicate solution with stirring, adding a phosphor to react, and drying and grinding to obtain the required fluorescent carbon quantum dot composite light-emitting material. Through the doping of the fluorescent carbon quantum dot with inorganic phosphors of different concentration, an emission-tunable fluorescent carbon quantum dot composite light-emitting material within the range from the red-purple to light green-blue is obtained. When excited by 375nm UV chip, white light can be successfully obtained, and can be well applied to LED.

Description

technical field [0001] The invention belongs to the field of composite functional materials, in particular to a fluorescent carbon quantum dot composite luminescent material and its preparation and application on LEDs. Background technique [0002] As a new type of high-efficiency solid-state light source, light-emitting diodes (LEDs) have significant advantages such as high efficiency, energy saving, environmental protection, long life, safety, rich colors, small size, and fast response. Its appearance is recognized as one of the most promising high-tech fields in the 21st century. Lighting applications are the second largest energy consumption in the world, accounting for about 19% of all energy consumption. If LEDs are used to replace traditional incandescent lamps, 90% of power consumption will be saved. Therefore, developing the LED industry and promoting the application process of LED lighting will greatly reduce energy consumption and environmental pollution. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/02C09K11/65C09K11/66C09K11/78H01L33/50
CPCY02B20/00
Inventor 雷炳富陈实李唯张浩然庄健乐刘应亮董汉武
Owner 中农工科(成都)农业发展有限公司
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