A kind of preparation method of aqueous phase quantum dot

A technology of quantum dots and water phase, which is applied in the field of preparation of water phase quantum dots, can solve the problems of low utilization rate of parent raw materials, high energy consumption, and long preparation time, so as to improve the utilization rate of raw materials, reduce the aging process, and improve the quality of quantum dots. Yield effect

Active Publication Date: 2019-09-10
GUANGDONG REAL FAITH LIGHTING TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method takes a long time to prepare (such as: near-infrared luminescence > 18h), consumes a lot of energy, and has low utilization rate of matrix raw materials. The prepared crystals have poor quality and poor particle size uniformity. point, not suitable for mass production

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  • A kind of preparation method of aqueous phase quantum dot
  • A kind of preparation method of aqueous phase quantum dot
  • A kind of preparation method of aqueous phase quantum dot

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Embodiment 1

[0033] This embodiment provides a method for preparing aqueous phase quantum dots, which specifically includes the following steps:

[0034] (1) Preparation of nanocluster intermediates in aqueous phase system:

[0035] Take the Cd parent (CdCl 2 2.5H 2 O) and ligand (mercaptopropionic acid, MPA) dissolved in water, CdCl 2 2.5H 2 The molar ratio of O to mercaptopropionic acid is 1:0.5-1:5, preferably, CdCl 2 2.5H 2The molar ratio of O to mercaptopropionic acid is 1:1.6, and the resulting quantum dots have better luminescence properties. Adjust the pH of the solution to 7-14, preferably 8.5. When the pH is less than 8, the solution is turbid and the quantum dots react unevenly. The resulting particle size distribution is poor; with the increase of pH, the growth rate of quantum dots is greatly increased, which reduces the controllability, so the optimal pH of the solution is 8.5. Stir in an ice bath, quickly inject the freshly prepared Te matrix (NaHTe) aqueous solution, ...

Embodiment 2

[0063] This embodiment provides a method for preparing aqueous phase quantum dots, which specifically includes the following steps:

[0064] (1) Preparation of nanocluster intermediates in aqueous phase system:

[0065] Take the Cd parent (CdCl 2 2.5H 2 O) and ligand (mercaptopropionic acid, MPA) dissolved in water, CdCl 2 2.5H 2 The molar ratio of O to mercaptopropionic acid is 1:0.5-1:5, preferably, CdCl 2 2.5H 2 The molar ratio of O to mercaptopropionic acid is 1:1.6, and the resulting quantum dots have better luminescence properties. Adjust the pH of the solution to 7-14, preferably 8.5. When the pH is less than 8, the solution is turbid and the quantum dots react unevenly. The resulting particle size distribution is poor; with the increase of pH, the growth rate of quantum dots is greatly increased, which reduces the controllability, so the optimal pH of the solution is 8.5. Stir in an ice bath, quickly inject the freshly prepared Se matrix (NaHSe) aqueous solution,...

Embodiment 3

[0069] This embodiment provides a method for preparing aqueous phase quantum dots, which specifically includes the following steps:

[0070] (1) Preparation of nanocluster intermediates in aqueous phase system:

[0071] Take the Cd parent (CdCl 2 2.5H 2 O) and ligand (mercaptopropionic acid, MPA) dissolved in water, CdCl 2 2.5H 2 The molar ratio of O to mercaptopropionic acid is 1:0.5-1:5, preferably, CdCl 2 2.5H 2 The molar ratio of O to mercaptopropionic acid is 1:1.6, and the resulting quantum dots have better luminescence properties. Adjust the pH of the solution to 7-14, preferably 8.5. When the pH is less than 8, the solution is turbid and the quantum dots react unevenly. The resulting particle size distribution is poor; with the increase of pH, the growth rate of quantum dots is greatly increased, which reduces the controllability, so the optimal pH of the solution is 8.5. Stir in an ice bath, quickly inject the freshly prepared Te matrix (NaHTe) aqueous solution,...

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Abstract

The invention discloses a preparation method of water-phase quantum dots. The preparation method comprises the following steps: using a nanocluster intermediate as a seed, coating the nanocluster intermediate with a shell material according to a seed growth method, and preparing the quantum dots. According to the preparation method, the crystal growth process can be effectively controlled, the seed growth method is introduced into preparation of the quantum dots for the first time, rapid preparation of the high-concentration water-phase quantum dots is achieved, the raw material utilization rate of the water-phase quantum dots is greatly increased and is higher than 50%, and the quantum yield rate is also increased and can reach 40-60%; the Ostwald aging process is reduced, the preparation time of the quantum dots is shortened, and the production efficiency is improved; the half peak width of the quantum dots prepared by the preparation method is narrow, and the half peak width of red quantum dots is smaller than or equal to 50 nm; the quantum dots prepared by the preparation method are relatively low in cost, the cost of 1g of the quantum dots is lower than 100 yuan, and the preparation method is suitable for batch production.

Description

technical field [0001] The lighting technology field of the present invention specifically relates to a preparation method of water-phase quantum dots. Background technique [0002] Semiconductor lighting technology is a new type of lighting technology based on high-efficiency white light emitting diodes (White Light Emitting Diode, WLED), which is recognized as one of the most promising high-tech fields in the 21st century. In terms of the domestic LED industry, the overall output value of my country's semiconductor lighting industry exceeded 500 billion yuan for the first time in 2016, and the industry scale reached 521.6 billion yuan, but most of it was concentrated in the downstream assembly process, and the production capacity of high-tech was low, and the main competitive technologies were still in the hands of Foreign patents. The nine major national key research and development plans in 2016 again mention the concept of nanometer and quantum, and the development of q...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/02
Inventor 王恺郝俊杰徐冰邓建孙小卫
Owner GUANGDONG REAL FAITH LIGHTING TECH
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