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All-inorganic halogen perovskite nano-crystal and preparation method thereof

A nanocrystal and perovskite technology is applied in the field of nanomaterials to achieve the effects of convenient operation, high photoluminescence quantum yield and high solubility

Active Publication Date: 2019-01-25
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the indirect synthesis of CsPbX in the prior art 3 There are still few methods for nanocrystals, and it is urgent to develop other new methods with simple process and convenient operation

Method used

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  • All-inorganic halogen perovskite nano-crystal and preparation method thereof

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preparation example Construction

[0031] The invention provides a method for preparing all-inorganic halogen perovskite nanocrystals, the method comprising the following steps:

[0032] S1. Preparation of Cs 4 wxya 6 nanocrystals;

[0033] S2. Cs described in step 1 4 wxya 6 Nanocrystals are dispersed in a non-polar solvent to obtain a dispersion solution, and then water is poured into the dispersion solution and shaken, so that the Cs 4 wxya 6 Nanocrystal conversion to CsPbX 3 nanocrystals.

[0034] The halogen X of the present invention includes Cl, Br, I, Cl / Br, Cl / I, the above Cs 4 wxya 6 Structure includes Cs 4 PbCl 6 、Cs 4 Pb(Cl / Br) 6 、Cs 4 PbBr 6 、Cs 4 Pb(Br / I) 6 、Cs 4 PB 6 one or more of.

[0035] The present invention utilizes the high solubility of CsX in water, Cs 4 wxya 6 Due to the ionic properties of nanocrystals and the strong ion diffusion, water treatment of Cs 4 wxya 6 A non-polar solution of nanocrystals, which dissociates excess CsX and thereby dissociates non-fluores...

Embodiment 1

[0054] 1) Weigh 0.16g Cs 2 CO 3 , 1mL of oleic acid and 16mL of octadecene were added to a 50mL three-necked flask, heated to 120°C, vacuumized at this temperature for 30 minutes, and then heated under N 2 Heating to 150°C under atmosphere until Cs 2 CO 3 Dissolve completely and react with oleic acid to form cesium oleate solution. After the reaction was completed, the cesium oleate solution was cooled to 120°C and kept at 120°C.

[0055] 2) Weigh 1mL oleylamine, 1mL oleic acid, 10mL octadecene and 0.2mmol PbBr 2 , the above-mentioned substances were added to a 25mL three-necked flask to form PbBr 2 Mix the solution and carry out vacuum treatment for 30 minutes. PbBr in the three-necked flask 2 Mixed solution in N 2 Heated to 140°C under ambient conditions, then quickly added 4.4mL of cesium oleate solution at 120°C prepared in step 1) to PbBr 2 A reaction mixture was formed in the mixed solution, and after 7 seconds, the reaction mixture was cooled with an ice-water ...

Embodiment 2

[0063] 1) Weigh 0.16g Cs 2 CO 3 , 1mL of oleic acid and 16mL of octadecene were added to a 50mL three-necked flask, heated to 120°C, vacuumized at this temperature for 20 minutes, and then heated under N 2 Heating to 150°C under atmosphere until Cs 2 CO 3 Dissolve completely and react with oleic acid to form cesium oleate solution. After the reaction was completed, the cesium oleate solution was cooled to 120°C and kept at 120°C.

[0064] 2) Weigh 1mL oleylamine, 1mL oleic acid, 10mL octadecene and 0.2mmol PbCl 2 , the above-mentioned substances were added to a 25mL three-necked flask to form PbCl 2 Mix the solution and carry out vacuum treatment for 20 minutes. PbCl in the three-necked flask 2 Mixed solution in N 2 Heated to 140 °C under ambient conditions, then quickly added 4.4 mL of the 120 °C cesium oleate solution prepared in step 1) into the PbCl 2 A reaction mixture was formed in the mixed solution, and after 7 seconds, the reaction mixture was cooled with an ...

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Abstract

The invention relates to an all-inorganic halogen perovskite nano-crystal and a preparation method thereof. The preparation method comprises: preparing a Cs4PbX6 nano-crystal, and dispersing the Cs4PbX6 nano-crystal in a non-polar solvent to obtain a dispersion solution; and injecting water into the dispersion solution, and oscillating to convert the Cs4PbX6 nano-crystal into a CsPbX3 nano-crystal. According to the present invention, through the water initiation process, the conversion of the Cs4PbX6 nano-crystal incapable of emitting fluorescence into the CsPbX3 nano-crystal with excellent light emitting performance under normal temperature and normal pressure is achieved; the method has characteristics of simple process and convenient operation; and the prepared Cs4PbX6 nano-crystal hasadvantages of good dispersibility, excellent light emitting performance and narrow emission width, and has the photoluminescence quantum yield of up to 75%, wherein the optical properties can be adjusted within the whole visible light range.

Description

technical field [0001] The invention relates to the technical field of nanometer materials, in particular to an all-inorganic halogen perovskite nanocrystal and a preparation method thereof. Background technique [0002] All-inorganic cesium lead halide perovskite (CsPbX 3 (X=Cl,Br,I,Cl / Br,Cl / I)) nanocrystals due to their excellent photophysical properties, such as high photoluminescence quantum yield (PLQY, up to 100% after processing), narrow emission width, and The tunable bandgap covering the entire visible light range has become the most concerned new nanofunctional material in recent years, CsPbX 3 Nanocrystals have shown attractive application prospects in photovoltaics, lasers, light-emitting diodes, and photodetectors. [0003] CsPbX that has been developed so far 3 The preparation methods are mainly thermal injection method, solvothermal method, ultrasonic method, room temperature precipitation method and chemical vapor deposition method (CVD). Corresponding Cs...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G21/00C09K11/66B82Y40/00
CPCB82Y40/00C01G21/006C01P2002/72C01P2002/84C01P2004/04C09K11/665
Inventor 张桥吴林忠于晓雅徐勇仲启轩胡慧成陈敏
Owner SUZHOU UNIV
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