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A spectrally controllable cdse quantum dot preparation method

A technology of quantum dots and spectroscopy, applied in the field of quantum dot preparation, can solve problems such as the inability to obtain emitting CdSe quantum dots stably

Active Publication Date: 2019-03-01
苏州昆道新材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the emission wavelength coverage of the prepared CdSe quantum dots is 450 to 650nm, and the existing preparation methods cannot stably obtain CdSe quantum dots with emission wavelengths less than 450nm.

Method used

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  • A spectrally controllable cdse quantum dot preparation method

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Embodiment Construction

[0009] Spectrally controllable CdSe quantum dot preparation methods include,

[0010] Step 1: Weigh 114mg of selenium powder and 2.5ml of tri-n-octylphosphine (TOP) into a three-neck flask, heat to 100°C and stir for reaction. Then nitrogen gas was fed and evacuated 3 times, and nitrogen gas was continuously fed. Stop heating when the selenium powder is completely dissolved, continue feeding nitrogen gas until the solution drops to room temperature, and take out the colorless transparent liquid.

[0011] Step 2: Put 56mg tetradecylphosphonic acid (TDPA), 0.35g octadecylamine (ODA), 0.65g tri-n-octylphosphine oxide (TOPO), and 14mg cadmium oxide (CdO) into a three-necked flask, and seal the flask and insert the thermometer. Heating was carried out in the state of nitrogen gas, and the solution appeared as a red turbid liquid after reaching 100°C, and the vacuum was started for 30 minutes, and the liquid was brownish red at this time. After the vacuuming was completed, the ni...

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Abstract

The invention discloses a preparation method of CdSe quantum dots with controllable spectrum. The preparation method comprises the following steps: step 1, a Se precursor is prepared through steps as follows: Se powder is added to tri-n-octylphosphine and heated to 100 DEG C, nitrogen is introduced for protection, a product is cooled to the room temperature after sufficient reaction, and a colorless and transparent liquid is taken; step 2, tetradecyl phosphoric acid, octadecylamine, tri-n-octylphosphine and cadmium oxide are taken and mixed, the mixture is heated with nitrogen introduction, vacuumized after the temperature reaches 100 DEG C and kept in the vacuum state, then nitrogen is introduced again, the mixture is heated to 330 DEG C, kept for 10 min and then cooled to 275 DEG C, the Se precursor obtained in the step 1 is added, and the CdSe quantum dots are separated and taken out within 4-80 s after addition of the Se precursor. The CdSe quantum dots with emission wavelength being 450 nm or smaller can be obtained with the method.

Description

technical field [0001] The invention relates to a method for preparing CdSe quantum dots, in particular to a method for preparing CdSe quantum dots with controllable spectra, and belongs to the technical field of quantum dot preparation. Background technique [0002] Quantum dots are nanoparticles composed of II-VI or III-V elements. The particle size of quantum dots is generally between 1 and 10 nm. Since electrons and holes are quantum-confined, the continuous energy band structure becomes a discrete energy level structure with molecular characteristics, and can emit fluorescence after being excited. At present, in the preparation of CdSe quantum dots, selenium powder is usually used as the selenium source, tri-n-octylphosphine (TOP) is used as the solvent to prepare the Se precursor, CdO is used as the cadmium source, and an organic coating agent and a co-solvent are added to obtain the Cd precursor. CdSe quantum dots are obtained after the precursor and the Cd precursor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/88B82Y20/00B82Y40/00
CPCB82Y20/00B82Y40/00C09K11/883
Inventor 杨希峰尹兴锐李南星张德宝杨宏刘玉申况亚伟顾利萍孙苏徽赵明江
Owner 苏州昆道新材料科技有限公司