One-step preparation of white light-emitting carbon dots

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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Problems solved by technology

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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