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Perovskite quantum dots and synthesis method thereof

A synthesis method and perovskite technology, applied in nanotechnology, electrical components, nanotechnology, etc., can solve the problems of weak binding force of quantum dots, affecting electron transport, weak resistance of quantum dots, etc., and achieve stable solution synthesis and preparation. Simple process and good protective effect

Inactive Publication Date: 2018-07-06
SUZHOU UNIV
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Problems solved by technology

The current mainstream display technology is liquid crystal display (LCD), but there are still defects, such as the slow response time of LCD and relatively narrow color gamut.
[0004] At present, there are many synthetic works for the preparation of perovskite quantum dots, but there is no major breakthrough in the stability of the synthesized quantum dots themselves. In the face of high temperature, humidity and purification process, the structure of the quantum dots themselves will be destroyed. The surface ligands fall off, resulting in a sharp decline in the fluorescence quantum yield, which is not conducive to the preparation and application of LEDs
The traditional synthesis of perovskite quantum dots uses oleic acid / oleylamine to wrap its surface. QLED is a light-emitting diode based on quantum dots. The preparation of QLED has very high requirements for its perovskite quantum dot film formation, while oleic acid / oleyl Due to the high oleic acid / oleylamine content of amine-wrapped quantum dots, in the QLED preparation process, the surface organic matter content is high, the film formation is poor, and the electron transmission is affected at the same time, so the efficiency of the prepared QLED is very low
If you want to improve the film formation of perovskite quantum dots, purification is undoubtedly a very effective method to remove excess oleic acid / oleylamine and ensure low organic content. However, perovskite quantum dots coated with oleic acid / oleylamine In the purification process, it is greatly affected by the purification reagent. The binding force between oleic acid / oleylamine and quantum dots is weak, and it is easy to peel off during the purification process, resulting in a sharp drop in solubility and fluorescence quantum yield, so oleic acid / oleylamine Amine-coated quantum dots are limited in the preparation of QLEDs
In addition, the quantum dots wrapped with oleic acid / oleylamine ligands have very weak resistance to water and air, and the prepared QLEDs are easily affected by air, which is not conducive to large-scale applications in the future.

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  • Perovskite quantum dots and synthesis method thereof
  • Perovskite quantum dots and synthesis method thereof
  • Perovskite quantum dots and synthesis method thereof

Examples

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Embodiment 1

[0054] This embodiment provides a pure inorganic lead system perovskite quantum dot synthesis method, specifically as follows:

[0055] Get about 0.3g of cesium acetate into a three-necked flask, then add 10ml of octadecene, and add 1ml of oleic acid to aid in dissolution. First pump and fill nitrogen at room temperature to remove excess water and oxygen, then raise the temperature to 120°C to dissolve all cesium acetate solids, and then carry out nitrogen pumping. The cesium salt solution can be stored at low temperature and reused. until the solution is clear and transparent.

[0056] Take 0.069g of lead bromide solid and add it to a three-necked flask, add 5ml of octadecene, add 1g of solid tri-n-octyl phosphine oxide and 0.1g of octyl phosphoric acid at the same time, pump nitrogen at room temperature, remove excess water and Oxygen, then raise the temperature to 120°C. During the heating process, the solid tri-n-octylphosphine oxide dissolves at 40-50°C, and the lead bro...

Embodiment 2

[0062] This embodiment provides a synthetic method for organic-inorganic hybrid lead system perovskite quantum dots, specifically as follows:

[0063] Add about 0.3 g of cesium acetate and 0.216 g of formamidine acetate into a three-necked flask, then add 10 ml of octadecene, and simultaneously add 2 ml of oleic acid to aid in dissolution. First, nitrogen gas is pumped and charged at room temperature to remove excess water and oxygen, and then the temperature is raised to 120° C. to dissolve all cesium acetate solids, and then nitrogen gas is pumped to obtain a mixed solution. The mixed solution can be stored at low temperature and reused. When used, it should be raised to the corresponding temperature until the solution is clear and transparent.

[0064] Take 0.069g of lead bromide solid and add it to a three-necked flask, add 5ml of octadecene, add 1g of solid tri-n-octyl phosphine oxide and 0.1g of octyl phosphoric acid at the same time, pump nitrogen at room temperature, r...

Embodiment 3

[0069] This embodiment provides a pure organic lead system perovskite quantum dot synthesis method, as follows:

[0070] Take 0.216g of formamidine acetate and put it into a three-neck flask, then add 10ml of octadecene, and add 1ml of oleic acid to help dissolve it. First, nitrogen gas is pumped and filled at room temperature to remove excess water and oxygen, and then the temperature is raised to 120° C. to dissolve all formamidine acetate solids, and then nitrogen gas is pumped to obtain formamidine acetate solution. The formamidine acetate solution can be stored at low temperature and reused. When used, it should be raised to the corresponding temperature until the solution is clear and transparent.

[0071] Add 5ml of octadecene into the three-necked flask, add 1g of solid tri-n-octylphosphine oxide and 0.1g of octyl phosphoric acid at the same time, add 0.069g of lead bromide solid at the same time, remove excess water and oxygen, and directly raise the temperature to 10...

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Abstract

The invention relates to a synthesis method of perovskite quantum dots. The method includes the following steps: cesium salt and / or organic salt is dissolved in an organic solvent to obtain a first solution. The organic salt is formamidine salt, methylamine salt or naphthylamine salt; metal salt is dissolved in an organic solvent and an alkyl phosphoric acid and a compound of the formula (1) are added to obtain a second solution. The metal salt is a lead salt or a bismuth salt. The formula (1) is as follows: R is alkyl; raising the temperature of the first solution to 120-140oC, then injectingthe first solution into a second solution with the temperature of 120-180oC. The molar ratio of the cesium salt and / or the organic salt in the first solution to the metal salt in the second solutionis not more than 1:2 to obtain the perovskite quantum dot. According to the invention the perovskite quantum dots prepared by the above preparation method are also provided. The perovskite quantum dots are spherical. The perovskite quantum dots comprise perovskite of the inner layer and the perovskite surface is connected with alkyl phosphoric acid through a non-covalent bond.

Description

technical field [0001] The invention relates to the technical field of quantum dot synthesis, in particular to a perovskite quantum dot and a synthesis method thereof. Background technique [0002] With the development of display technology, market competition is becoming increasingly fierce. The current mainstream display technology is liquid crystal display (LCD), but there are still defects, such as the slow response time of LCD and relatively narrow color gamut. Organic light-emitting display (OLED), as a display technology that develops relatively fast this year, has a relatively narrow half-height width (40 nanometers) of its luminescence peak, and has received widespread attention in the industry. However, the production cost of OLED is relatively high, and its lifespan and difficulties in mass production are all problems that need to be overcome at present. With II-VI quantum dots (such as CdSe) display technology (QLED), quantum dots can be processed using a solut...

Claims

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Application Information

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IPC IPC(8): H01L51/56H01L51/50B82Y30/00
CPCB82Y30/00H10K50/115H10K71/00
Inventor 孙宝全宋涛谈叶舒
Owner SUZHOU UNIV
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