Solution-processable solid blue fluorescent-red phosphorescent carbon quantum organic frameworks with high quantum yield and their preparation and applications

A blue fluorescent and solution processing technology, applied in the field of fluorescent-phosphorescent carbon nanomaterials, can solve the problems of low quantum yield, low phosphorescent quantum yield, and limiting the application of phosphorescent CQDs

Active Publication Date: 2022-03-22
BEIJING NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, all phosphorescence-emitting CQDs obtained so far are limited to yellow emission; worse, they have extremely low solubility, long phosphorescence lifetime, and low phosphorescence quantum yield, which greatly limit the phosphorescence Application of CQDs in Electroluminescent Diodes
[0006] At present, although the content of carbonyl functional groups can be significantly increased by using urea as a precursor, yellow phosphorescent carbon quantum dots with single-component emission can be prepared, but its quantum yield is relatively low (25%), and the solid is insoluble and cannot be processed.
Therefore, the preparation of a phosphorescent carbon quantum dot that can be processed in solution, has a high quantum yield, a short phosphorescent lifetime, and a long emission wavelength is the only way to develop high-efficiency electroluminescent LEDs, and there are still great challenges.

Method used

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  • Solution-processable solid blue fluorescent-red phosphorescent carbon quantum organic frameworks with high quantum yield and their preparation and applications
  • Solution-processable solid blue fluorescent-red phosphorescent carbon quantum organic frameworks with high quantum yield and their preparation and applications
  • Solution-processable solid blue fluorescent-red phosphorescent carbon quantum organic frameworks with high quantum yield and their preparation and applications

Examples

Experimental program
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Effect test

Embodiment 1

[0047] Example 1. Preparation of a solid blue fluorescent-red phosphorescent carbon quantum organic framework with high quantum yield and solution processability

[0048] Weigh trimesic acid, guanidine phosphate, and 3,4,9,10-perylenetetracarboxylic dianhydride solids with a mass ratio of 20:10:1 as the carbon source precursor, and dissolve them in 15ml of N,N-dicarbonate with ultrasonic stirring. in methylformamide. 1 mL of concentrated sulfuric acid was added to the reaction system as a reaction catalyst. The above solution was transferred to a 25mL Teflon-lined stainless steel autoclave, and the lid was tightened. Solvothermal reaction was performed at 200°C for 4 hours, and then the reactor was naturally cooled to room temperature to obtain a light blue carbon quantum dot organic framework N,N-dimethylformamide solution, which was then mixed with 20 mL of 0.01 mole per Neutralize to neutral with 1 liter of sodium hydroxide aqueous solution, then filter, take the filtrate...

Embodiment 2

[0053] Example 2. Preparation of electroluminescent diode based on red phosphorescent carbon quantum dot organic framework structure

[0054] The high quantum yield solution-processable solid blue fluorescent-red phosphorescent carbon quantum organic framework prepared in Example 1 is used as an active light-emitting layer in a monochromatic electroluminescent diode. Such as Figure 19 As shown, the light-emitting diode device structure includes a transparent glass substrate (glass), an anode layer (ITO), a hole injection layer poly 3,4-ethylenedioxythiophene: polystyrene sulfonate (PEDOT) from bottom to top. :PSS), active light emitting layer (red phosphorescent carbon quantum organic framework with high quantum yield), electron transport layer 1,3,5-tris(1-phenyl-1H-benzimidazol-2-yl)benzene (TPBI ), the cathode layer (LiF / Al). The structure of the electroluminescent diode device is described as: ITO / PEDOT:PSS / CDOFs / TPBi / LiF / Al.

[0055] The preparation method of the mono...

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Abstract

The invention relates to the field of fluorescent-phosphorescent carbon nanomaterials, in particular to a solution-processable solid blue fluorescent-red phosphorescent carbon quantum organic framework with high quantum yield and its preparation and application. Using trimellitic acid, guanidine phosphate and 3,4,9,10-perylenetetracarboxylic dianhydride as carbon source precursors, a solution-processable solid blue fluorescent-red can be obtained by solvothermal method under acidic conditions Phosphorescent carbon quantum organic frameworks. The blue fluorescent-red phosphorescent solid carbon quantum organic framework prepared by the present invention is a network structure formed by connecting chains with π-channels with carbon quantum dots as the core, and has broad application prospects.

Description

technical field [0001] The invention relates to the field of fluorescent-phosphorescent carbon nanomaterials, in particular to a solid blue fluorescent-red phosphorescent carbon quantum organic framework capable of solution processing with high quantum yield and its preparation and application. Background technique [0002] Carbon quantum dots (Carbon Quantum Dots, CQDs), as a new class of carbon nanomaterials with a size smaller than 10nm, are widely used in optoelectronic devices and biomedicine due to their advantages such as almost no toxicity, good biocompatibility, low cost, and stable fluorescence emission. The field has broad application prospects. More importantly, nanoscale CQDs due to the intact sp 2 The conjugated plane has obvious bandgap-dependent fluorescence tunability, which can be adjusted by changing the size of CQDs. Compared with traditional heavy metal-doped semiconductor quantum dots and organic small molecules with complex manufacturing processes, l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/65H01L33/50B82Y20/00B82Y40/00B82Y30/00
CPCC09K11/65H01L33/504B82Y20/00B82Y40/00B82Y30/00
Inventor 范楼珍石钰鑫
Owner BEIJING NORMAL UNIVERSITY
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