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Preparation method of wholly-inorganic lead-containing halide perovskite quantum dot fluorescent powder

A halide perovskite and quantum dot technology, which is applied in chemical instruments and methods, luminescent materials, nanotechnology, etc., can solve the problem of poor water and thermal stability of perovskite quantum dots, affecting the application performance of perovskite quantum dots and Foreground, quantum dot water and thermal stability can not be satisfied and other problems, to achieve the effect of high repetition rate, short reaction time, strong water stability and thermal stability

Inactive Publication Date: 2017-10-27
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the water and thermal stability of perovskite quantum dots synthesized using oleic acid and oleylamine modification are poor ( J. Am. Chem. Soc. 2016, 138, 5749; Angew. Chem. Int. Edit. , 2017, DOI:10.1002 / anie.201703703), which directly affects the application performance and prospects of perovskite quantum dots
Although it has been reported in the literature that the stability of quantum dots in humid air can be improved by using methods such as X-ray radiation, mesoporous silica adsorption, and silica coating, the water and thermal stability of quantum dots still cannot meet the needs of practical applications.

Method used

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  • Preparation method of wholly-inorganic lead-containing halide perovskite quantum dot fluorescent powder
  • Preparation method of wholly-inorganic lead-containing halide perovskite quantum dot fluorescent powder
  • Preparation method of wholly-inorganic lead-containing halide perovskite quantum dot fluorescent powder

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Embodiment 1

[0033] In this example, the dissolution-precipitation method is used to synthesize all-inorganic lead-containing halide quantum dots at room temperature, which specifically includes the following steps:

[0034] (1) Metal halide salts CsBr and PbBr 2 According to the molar ratio of 1:1, add in the DMF solution, under the magnetic stirring of 1000r / min until the metal halide salts CsBr and PbBr 2 completely dissolved.

[0035] (2) To the DMF solution of the metal halide salt obtained in (1), add 150 mg (10 mg / mL) of tetradecyl phosphoric acid and 1 mL of oleylamine as surfactants, and tetradecyl phosphonic acid as Precursors of organophosphates. Under magnetic stirring, a homogeneous mixed solution was formed as a reaction precursor.

[0036] (3) Add 1 mL of the precursor solution to the rapidly stirred 10 mL toluene solution to generate a quantum dot reaction solution.

[0037] (4) Centrifuge the above quantum dot reaction solution, pour the supernatant, and redisperse the...

Embodiment 2

[0039] Based on implementation case 1, the CsPbBr prepared by implementation case 1 3 The quantum dot reaction solution was washed by centrifugation for 3 times, and the precipitation of quantum dots was kept in the air at 35°C for 48 hours to form CsPbBr through self-assembly 3 Composite phosphor of quantum dots / tetradecyl phosphate.

[0040] Referring to Example 2, the difference is that the amount of all raw materials used is 4 times that of Example 1, so as to mass produce quantum dot phosphors. Finally, 1.5 g of CsPbBr was obtained at one time 3 Composite phosphor of quantum dots / tetradecyl phosphate.

Embodiment 3

[0042] Similar to Example 2, the difference is that the CsBr and PbBr in Example 2 2 Molar ratio 1:1 changed to CsI and PbI 2 Molar ratio 1:1, you can get CsPbI 3 Composite phosphor of quantum dots / tetradecyl phosphate.

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Abstract

The invention provides a preparation method of wholly-inorganic lead-containing halide perovskite quantum dot fluorescent powder. The preparation method comprises the following steps: S1, adding metal halides CsX and PbX2, alkyl phosphoric acid and an amine type surfactant into N,N-dimethylformamide, thus obtaining a precursor solution; S2, adding the precursor solution into methylbenzene, thus obtaining wholly-inorganic lead-containing halide perovskite quantum dot solution; S3, centrifuging the wholly-inorganic lead-containing halide perovskite quantum dot solution in S2, and carrying out self assembly to form the wholly-inorganic lead-containing halide perovskite quantum dot fluorescent powder after washing. The invention provides a simple precipitation method for preparing wholly-inorganic lead-containing quantum dot and organic phosphate compound-fluorescent powder. According to the preparation method provided by the invention, the reaction temperature is lower, the reaction time is shorter, the operation is simple, the repetition rate is high, and volume production can be realized; the fluorescent powder synthesized in the invention not only has higher fluorescence quantum efficiency, narrowband emission and wide color gamut, but also has strong water stability and strong thermal stability.

Description

technical field [0001] The invention relates to the technical field of preparation of photoelectric luminescent materials, in particular to a preparation method of an all-inorganic lead-containing halide perovskite quantum dot fluorescent powder. Background technique [0002] All-inorganic lead-containing perovskite quantum dots have been widely studied for optoelectronic devices due to their high fluorescent quantum dot efficiency, narrow emission, and wide color gamut. At present, the thermal injection method and the dissolution-precipitation method are mainly used to synthesize all-inorganic lead-containing perovskite quantum dots. The synthesized quantum dots have good monodispersity, high fluorescence quantum dot efficiency, narrow-band emission and tunable luminescence. [0003] However, the water and thermal stability of perovskite quantum dots synthesized using oleic acid and oleylamine modification are poor ( J. Am. Chem. Soc. 2016, 138, 5749; Angew. Chem. Int....

Claims

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Application Information

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IPC IPC(8): C09K11/66C09K11/02B82Y40/00
Inventor 王静宣曈曈楼孙棋黄俊健曹鲁豫龚书铭
Owner SUN YAT SEN UNIV
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