One-step preparation method for white light-emitting carbon dots
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A technology of carbon dots and white light, applied in the field of luminescent nanomaterials, can solve the problems of difficulty in uniform dispersion, consumption of rare earth resources, and difficulty in control, and achieves safe and efficient methods, simple processes, and the effects of light-emitting and encapsulation.
Active Publication Date: 2018-12-04
BEIJING UNIV OF TECH
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In 2004, researchers discovered fluorescent carbon nanoparticles for the first time when purifying single-walled carbon nanotubes (J.Am.Chem.Soc.2004,126:12736-12737.); in 2006, it was officially named carbon dots (J.Am.Chem.Soc.2006,128:7756-7757.); During the 14 years of rapid development of fluorescent carbon dots, more than 25,000 works on carbon dots have been widely reported by researchers all over the world ( Web of Science), but there are still many challenges in the research of highly efficient fluorescent carbon dots with long-wavelength emission
However, inorganic phosphors have many disadvantages, such as consumption of rare earth resources, high reaction temperature, large particle size and difficulty in controlling, and difficulty in uniform dispersion. Therefore, fluorescent carbon dots are of great significance as an alternative material.
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Embodiment 1
[0030] The carbon dots emitting white light were prepared as follows:
[0031] 1. Weigh 0.254g of o-phenylenediamine and 0.255g of catechol, put them in a 20mL reaction kettle, add 10mL of n-amyl alcohol into it, put them in an oven, heat up to 200°C, keep warm for 12 hours, and cool naturally. A solution of carbon dots emitting white light was obtained.
[0032] 2. Take out the solution obtained in step 1 and place it in uniformly stirred hot water at 85°C that is 10 times the volume of the reacted solution, heat and stir for 3 hours, and fully dissolve the incompletely reacted reactants in the hot water. Put this liquid in a centrifuge tube, centrifuge at 5000 rpm for 10 minutes, and take the lower layer of sediment.
[0033] 3. Redisperse the lower precipitate obtained in step 2 into ethanol with 3 times the volume of the solution after the reaction, and sonicate for 30 minutes.
[0034] 4. The liquid obtained in step 3 was rotary evaporated, and the solid in the lower la...
Embodiment 2
[0042] The preparation method of white light LED is as follows:
[0043]1. Weigh 5 μg of the white carbon dot prepared in Example 1 and place it in a 4 mL small plastic tube, add 25 μL of tetraethylenepentamine to it to obtain a transparent and clear solution, then add 125 μL of epoxy resin, and mix well.
[0044] 2. Drop a drop of the mixture in step 1 on the LED chip whose emission peak is at 365nm, and let it stand at room temperature for 6 hours until it solidifies.
[0045] 3. The LED emits white light under the excitation of 365nm.
[0046] Figure 7 It is a picture of the white light LED device prepared in Example 2.
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Abstract
The invention discloses a one-step preparation method for white light-emitting carbon dots, and relates to the field of luminescent nanomaterials. The white light-emitting carbon dots are prepared byusing the following method: in a constant temperature oven, dissolving o-phenylenediamine and catechol at different ratios in an alcohol solvent which includes methanol, ethanol, propyl alcohol, butylalcohol, pentanol and other alcohol, packaging the mixture into a reaction kettle, controlling the temperature of the oven at 140-240 DEG C, and performing a solvothermal reaction for 4-48 hours so as to obtain fluorescent carbon dots with luminescent peaks covering 400-700 nm, wherein the obtained fluorescent carbon dots includes the white light-emitting carbon dots which have CIE chromaticity coordinates of (0.33, 0.33). The white light-emitting carbon dots prepared by using the method has excellent optical properties, a simple preparation method, easily available materials and low cost, and can be directly added to epoxy resin as an encapsulating material of diodes so as to prepare a white light LED device.
Description
technical field [0001] The invention relates to the field of luminescent nanomaterials, more specifically, to the one-step preparation and application of white light emitting carbon dots. Background technique [0002] As the most widely existing element in nature, carbon element constitutes the earth on which human beings live in various forms. With the continuous development of nanotechnology, carbon nanomaterials have attracted much attention because of their properties of light, magnetism, electricity, heat, and sound, and are developing rapidly. Especially the rising star fluorescent carbon dots in the carbon nano family, its fluorescence is stable and resistant to photobleaching (Small 2012,8:281-290.); the excitation spectrum is wide and continuous (J.Am.Chem.Soc.2006,128 :7756-7757.); The emission wavelength is adjustable (Adv. Mater. 2017, 29: 1604436.) and so on have become its unique advantages. In 2004, researchers discovered fluorescent carbon nanoparticles for...
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