The invention provides carbon quantum dots with room-temperature phosphorescence and delayed fluorescence properties. The carbon quantum dots can generate fluorescence under the excitation of ultraviolet light with the wavelength of 315-475nm, wherein the fluorescence intensity reaches the maximum when the excitation wavelength is 375nm. The particle size distribution range of the carbon quantum dots is 2-6nm. The brand-new carbon quantum dots with room-temperature phosphorescence and delayed fluorescence properties are synthesized from isocyanate under the action of microwaves. The carbon quantum dots have high yield, are oil-soluble, and can be compounded into a polymer material in situ without aggregation. The structure of the carbon quantum dots contains certain amounts of O, N and other heteroatoms with lone electron pairs, thereby increasing the transition probability from singlet state to triplet state under excitation. Meanwhile, the matrix performs the functions of reducing the nonradiative transition and quenching the triplet-state oxygen, so that the prepared carbon quantum dots have the visible stable room-temperature phosphorescence and delayed fluorescence properties in the matrix.

Carbon quantum dots with room-temperature phosphorescence and delayed fluorescence properties, and synthesis and application thereof

The invention relates to a method for preparing carbon quantum dots. The method is mainly characterized by comprising the following steps of: adding hydrogen peroxide in natural compounds such as saccharides or proteins; and then, performing direct hydro-thermal treatment to obtain the carbon quantum dots with strong fluorescence. The shape of the natural compounds after hydro-thermal treatment can be greatly changed due to addition of hydrogen peroxide, so that the carbon quantum dots with strong fluorescence are formed. The method is wide in material source, very cheap in price, simple and convenient to operate, simple in post treatment and environment-friendly, and the yield of the carbon quantum dots is high. The property of the carbon quantum dots can be conveniently adjusted by content of added hydrogen peroxide, so that the method has large-scale preparation potential and a wide application prospect.

Method for preparing carbon quantum dots

Method for preparing photoluminescence carbon quantum dot

The invention discloses a white light LED (Light Emitting Diode) capable of lighting by triggering carbon points through blue light, and a preparation method thereof. The white light LED comprises an insulating base, a bowl-shaped reflection mirror, a blue light LED chip and a lens, wherein the bowl-shaped reflection mirror is arranged on the insulating base; a heat conduction sheet is arranged between the bowl-shaped reflection mirror and the insulating base; the blue light LED chip is fixed in the bowl-shaped reflection mirror; the silane functionalized carbon points are covered on the blue light LED chip; the lens is arranged outside the silicon bowl-shaped reflection mirror; a transparent sealing material is filled into the lens; organic multielement acid is fed into silane liquid which is boiled and flows back under the protection of nitrogen, so that the organic multielement acid is subjected to pyrolysis so as to synthesize the silane functionalized carbon points; the blue LED chip is fixed inside the bowl-shaped reflection mirror; the silane functionalized carbon points are coated on the blue LED chip and are cured; the lens is arranged outside the bowl-shaped reflection mirror; and the lens is filled with the transparent sealing material. The white light LED and the preparation method can be beneficial for improving the light emission efficiency, and the use stability and prolonging the service life of an LED.

White light LED (Light Emitting Diode) capable of lighting by triggering carbon points through blue light, and preparation method thereof

A white electroluminescent device realized by carbon quantum dots comprises a transparent sealing layer, a carbon quantum dot fluorescent layer, a transparent conductive layer, a light-emitting layer and a back conductive layer. The white electroluminescent device is characterized in that the carbon quantum dot fluorescent layer comprises carbon-containing nano fluorescent materials, has a light absorption range of 365-520 nm and a light emission range of 440-610 nm, and is used for converting the luminescent spectrums of the light-emitting layer into white light.

White electroluminescent device realized by carbon quantum dots

The invention discloses a fluorescent carbon quantum dot, which is nontoxic, has wide absorption spectrum and narrow fluorescence emission spectrum, has light colors adjustable with laser wavelength, and is high in luminescence efficiency and high in stability A chemical formula of the fluorescent carbon quantum dot is CaHbOcNd, wherein 01<=a<=09, 0005<=b<=01, 01<=c<=09, 0<=d<=015, and a+b+c+d=1

Fluorescent carbon quantum dot and its preparation method and application

The invention discloses a white-light LED (Light-emitting Diode) manufactured by utilizing quantum-dot fluorescent powder, aiming to solving the problems of lower color rendering property, narrower color range, poor stability and the like of the traditional LED technology. In the invention, the white-light LED (Light-emitting Diode) manufactured by utilizing the quantum-dot fluorescent powder comprises a heat-radiating base 1, gold wires 2, a quantum dot and silica gel mixture 3, a purple light or blue light chip 4, a light extraction lens 5, filler silica gel 6 and two electrodes 6, wherein the two electrodes 7 are fixed at two ends of the heat-radiating base 1, the purple light or blue light chip 4 is fixed on the heat-radiating base 1 and between the two electrodes 7, the two electrodes 7 are respectively connected with the purple light or blue light chip 4 through the gold wires 2, the quantum dot and silica gel mixture 3 covers on the purple light or blue light chip 4, the fillersilica gel 6 is used for covering the two electrodes 7, the gold wires 2, the quantum dot and silica gel mixture 3 and the purple light or blue light chip 4 on the heat-radiating base 4, and the light extraction lens 5 is arranged outside the filler silica gel 6.

White-light LED (Light-emitting Diode) manufactured by utilizing quantum-dot fluorescent powder and manufacturing method thereof

The invention belongs to the fields of supramolecular polymer polymer chemistry and drop formation control, and particularly relates to supramolecular hydrogel microsphere modified with cyclodextrin water-solubility polymer and adamantine water-solubility polymer and formed by assembling subjective and objective bodies in a liquid drop, and a preparation method and application thereof. The first purpose of the invention is to provide novel supramolecular hydrogel microsphere formed by assembling subjective and objective bodies and a preparation method thereof method, the second purpose of the invention is to adopt liquid drop as a template to realize supramolecular assembly and achieve uniform particle size and controllable dimension of the supramolecular hydrogel microsphere, and the third purpose of the invention is to provide application of the type of supramolecular hydrogel microsphere in adriacin doxorubicin and taxol water-solubility antitumor drug sustained release, so as to achieve the purpose that a drug can keep a high concentration level for a long time.

Supramolecular hydrogel microsphere prepared by taking liquid drop as template and preparation method thereof

The invention discloses a method for preparing a luminescence-adjustable ligand-free cadmium sulfide quantum dot. The quantum dot does not need any organic molecules as ligands, has good stability, can be effectively hybridized with organic materials and prevents the phenomenon of phase separation in the hybridization process, and the luminescence wave length can be precisely adjusted along with a synthesis condition. According to the preparation method of the luminescence-adjustable ligand-free cadmium sulfide semiconductor quantum dot, cadmium acetate, cadmium propionate or cadmium stearate is selected as a cadmium source, and thiourea or sodium sulfide is selected as a sulfur source, and the luminescence-adjustable ligand-free cadmium sulfide semiconductor quantum dot can be prepared without any organic molecules as a cladding agent.

Ziyi Yu

Papers

Fluorescent carbon quantum dot and its preparation method and application

White-light LED (Light-emitting Diode) manufactured by utilizing quantum-dot fluorescent powder and manufacturing method thereof

Supramolecular hydrogel microsphere prepared by taking liquid drop as template and preparation method thereof

Luminescence-adjustable ligand-free cadmium sulfide semiconductor quantum dot and preparation method thereof