Polysiloxane functionalized carbon dots and preparation method thereof, and application of polysiloxane functionalized carbon dots

A polysiloxane, functionalization technology, applied in chemical instruments and methods, dyeing organosilicon compound treatment, energy-saving lighting, etc., can solve the problem of limited doping concentration of carbon dots, and achieve improved compatibility and good white light Good quality and compatibility

Active Publication Date: 2016-05-11
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But in this method the doping concentration of carbon dots is limited

Method used

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  • Polysiloxane functionalized carbon dots and preparation method thereof, and application of polysiloxane functionalized carbon dots
  • Polysiloxane functionalized carbon dots and preparation method thereof, and application of polysiloxane functionalized carbon dots
  • Polysiloxane functionalized carbon dots and preparation method thereof, and application of polysiloxane functionalized carbon dots

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Add isocyanate propyl methyl silicone oil and citric acid ethanol solution into a high-pressure reactor, and react at 170°C for 4 hours; after column separation, a concentrated isocyanate propyl methyl silicone oil carbon-dot ethanol solution with known carbon-dot concentration is obtained. Isocyanate propyl methyl silicone oil carbon dots are directly coated on the blue LED chip and cured. The blue light is combined with the emission of carbon dots to obtain white light.

[0041] In order to obtain isocyanate propyl methicone functionalized carbon dots with higher fluorescence quantum yield, different molecular weights of isocyanate propyl methicone were selected during the reaction, as shown in Table 1. The results show that the quantum efficiency is about 16%.

[0042] The quantum yield of carbon dots prepared by isocyanate propyl methyl silicone oil of different molecular weights in table 1

[0043]

[0044] figure 1 It shows that the carbon dots are circular ...

Embodiment 2

[0053] Add isocyanate propyl methyl silicone oil ethanol solution into the high-pressure reaction kettle, then add malic acid ethanol solution, and magnetically stir to obtain a blended solution; put the reaction kettle into a blast oven, and react at 170°C for 4 hours; obtain isocyanate after extraction and separation Propyl methyl silicone carbon dot ethanol solution.

Embodiment 3

[0055] Add isocyanate propyl methyl silicone oil ethanol solution into the high-pressure reaction kettle, then add malic acid ethanol solution, and magnetically stir to obtain a blended solution; put the reaction kettle into a blast oven, and react at 150°C for 16 hours; obtain isocyanate after extraction and separation Propyl methyl silicone carbon dot ethanol solution.

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Abstract

The invention discloses polysiloxane functionalized carbon dots. The size of the carbon dots is 1-10nm, the surfaces of the carbon dots are modified by polysiloxane, and the polysiloxane is chemically grafted on the surfaces of the carbon dots. The carbon dots can emit blue light to green light under the irradiation of light with the wavelength of 300-880nm. The invention also discloses preparation and application of the polysiloxane functionalized carbon dots. The polysiloxane functionalized carbon dots can be used instead of fluorescent powder to implement application in the field of white-light LEDs (light-emitting diodes), and can also be used as a light conversion layer or packaging layer material. The white-light LED prepared from the polysiloxane functionalized carbon dots has favorable white light quality and refraction coefficient, and can satisfy the requirements in commerce.

Description

technical field [0001] The invention relates to the field of luminescent materials. More specifically, it relates to a polysiloxane functionalized carbon point, a preparation method and an application in the field of white light LED lighting. Background technique [0002] Light-emitting diodes (LEDs) play an important role in the fields of display and lighting due to their superior properties such as low power consumption, long service life, and good durability. At present, commercial white LEDs are based on YAG:Ce blue LEDs, and yellow phosphor is dispersed in silicone resin or polymer as a light conversion layer. Combining the two, a dichroic white LED can be obtained. However, micron-scale phosphors have problems of light blocking and light leakage, which will seriously affect the optical performance of white LEDs. On the other hand, these phosphors usually involve expensive and environmentally polluting rare earth ions. The above defects will greatly limit the applica...

Claims

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Application Information

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IPC IPC(8): C09K11/65C09C1/44C09C3/12H01L33/50H01L33/56
CPCC09C1/44C09C3/12C09K11/65H01L33/504H01L33/56Y02B20/00
Inventor 谢政王云凤周传健周树云陈萍尹正茂赵新新
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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