Provided are soluble graphene quantum dots and light-emitting devices including the same. The soluble graphene quantum dot has an anthracenyl N-alkyl maleimide functional group at an edge thereof, thereby exhibiting improved solubility and/or improved emission characteristics.

Provided are soluble graphene quantum dots and light-emitting devices including the same. The soluble graphene quantum dot has an anthracenyl N-alkyl maleimide functional group at an edge thereof, thereby exhibiting improved solubility and/or improved emission characteristics.

A method of preparing an enhanced yellow-emitting carbon dots includes dissolving citric acid and urea in N,N-dimethylformamide, reacting at a temperature of 150-180° C. for 4-8 h to obtain a carbonized mixture, separating and purifying the carbonized mixture through column chromatography using an eluent prepared according to a volume ratio of dichloromethane to methanol from high to low, collecting a solution obtained by elution when the volume ratio of dichloromethane to methanol is 1:1-2, performing rotary evaporation to remove the solvent, and drying to obtain the yellow-emitting carbon dot. The yellow-emitting carbon dot with fluorescence intensity enhanced with the increase of temperature is synthesized. The yellow-emitting carbon dots has application value in the fields of temperature detection, biological imaging, photoelectric equipment and the like.

A method of preparing an enhanced yellow-emitting carbon dots includes dissolving citric acid and urea in N,N-dimethylformamide, reacting at a temperature of 150-180° C. for 4-8 h to obtain a carbonized mixture, separating and purifying the carbonized mixture through column chromatography using an eluent prepared according to a volume ratio of dichloromethane to methanol from high to low, collecting a solution obtained by elution when the volume ratio of dichloromethane to methanol is 1:1-2, performing rotary evaporation to remove the solvent, and drying to obtain the yellow-emitting carbon dot. The yellow-emitting carbon dot with fluorescence intensity enhanced with the increase of temperature is synthesized. The yellow-emitting carbon dots has application value in the fields of temperature detection, biological imaging, photoelectric equipment and the like.

An inverted nanocone structure of the present disclosure includes a first surface, a second surface spaced apart from the first surface by a predetermined distance and having a greater area than the first surface, and a body having an inverted cone shape between the first surface and the second surface, wherein at least one activated point defect center is provided in the body.

An inverted nanocone structure of the present disclosure includes a first surface, a second surface spaced apart from the first surface by a predetermined distance and having a greater area than the first surface, and a body having an inverted cone shape between the first surface and the second surface, wherein at least one activated point defect center is provided in the body.

A method for preparing a carbon nanodot-fluorescent polymer composite includes subjecting a reactant and a biological component to a reaction at 260° C. to 290° C., so as to obtain the carbon nanodot-fluorescent polymer composite containing a polymer and carbon nanodots dispersed in the polymer. The biological component includes at least one of collagen, chitin, gelatin, and sodium alginate. The reactant is selected from a reaction component or a polycondensate formed therefrom. The reaction component includes terephthalic acid having carboxylic acid groups and ethylene glycol capable of reacting with such groups. Also disclosed are the carbon nanodot-fluorescent polymer composite and a carbon nanodot-fluorescent composite fiber including the same.

A method for preparing a carbon nanodot-fluorescent polymer composite includes subjecting a reactant and a biological component to a reaction at 260° C. to 290° C., so as to obtain the carbon nanodot-fluorescent polymer composite containing a polymer and carbon nanodots dispersed in the polymer. The biological component includes at least one of collagen, chitin, gelatin, and sodium alginate. The reactant is selected from a reaction component or a polycondensate formed therefrom. The reaction component includes terephthalic acid having carboxylic acid groups and ethylene glycol capable of reacting with such groups. Also disclosed are the carbon nanodot-fluorescent polymer composite and a carbon nanodot-fluorescent composite fiber including the same.

Provided is an organic light emitting diode display device. The organic light emitting diode display device includes a flexible substrate, including a display region, a first barrier region and a second barrier region, wherein the first barrier region is located between the display region and the second barrier region, and a barrier is disposed on the flexible substrate of the second barrier region; wherein a groove is formed in the flexible substrate of the first barrier region, and an organic light emitting diode unit is disposed on the flexible substrate of the display region.

Provided is an organic light emitting diode display device. The organic light emitting diode display device includes a flexible substrate, including a display region, a first barrier region and a second barrier region, wherein the first barrier region is located between the display region and the second barrier region, and a barrier is disposed on the flexible substrate of the second barrier region; wherein a groove is formed in the flexible substrate of the first barrier region, and an organic light emitting diode unit is disposed on the flexible substrate of the display region.