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Preparation method of all-inorganic perovskite quantum dots serving as blue-violet light source

A technology of inorganic calcium and quantum dots, applied in inorganic chemistry, chemical instruments and methods, luminescent materials, etc., can solve the problems of high cost, Pb toxicity, poor equipment performance, etc.

Pending Publication Date: 2020-03-27
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Currently CsPbX 3 Most of the quantum dots are synthesized by thermal injection under inert gas, and the cost is relatively high
Wet chemistry does not require inert gases, but the synthesized quantum dot products are usually accompanied by large particles, which are not very suitable for assembling high-quality thin films, which will make the device performance poor
At the same time, Pb is toxic, and long-term use of such materials will cause health hazards

Method used

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  • Preparation method of all-inorganic perovskite quantum dots serving as blue-violet light source
  • Preparation method of all-inorganic perovskite quantum dots serving as blue-violet light source
  • Preparation method of all-inorganic perovskite quantum dots serving as blue-violet light source

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Embodiment 1

[0025] This embodiment provides a method for preparing an all-inorganic perovskite quantum dot as a blue-violet light source, comprising the following steps,

[0026] 1. Mix and heat 1.25ml oleic acid and 10ml octadecene to 100°C, then add 0.41g Cs 2 CO 3 Mix and stir to form a precursor solution;

[0027] 2. Add 1mmol PbCl 2 and 1mmol ZnCl 2 Heat and dry, then add to a mixture of 20ml octadecene, 4ml oleic acid, 4ml oleylamine and 2ml tri-n-octyl phosphine, heat to 135°C and stir to form a halide solution, after heating the halide solution to 190°C Add 2ml of precursor solution, the reaction time of halide solution and precursor solution is 13s, and generate CsPb 0.5 Zn 0.5 Cl 3 After cooling in the bath quickly, add 2 times the volume of ethyl acetate and perform the first centrifugation, the excess PbCl 2 , ZnC 2 , octadecene, oleic acid, oleylamine, and tri-n-octylphosphonium into ethyl acetate, remove the centrifugation liquid, add n-hexane to the solid product ob...

Embodiment 2

[0030] This embodiment provides a method for preparing an all-inorganic perovskite quantum dot as a blue-violet light source, comprising the following steps,

[0031] 1. Mix and heat 1.25ml oleic acid and 10ml octadecene to 100°C, then add 0.41g Cs 2 CO 3 Mix and stir to form a precursor solution;

[0032] 2. Add 1mmol PbCl 2 , 0.75 mmol PbBr 2 and 1mmol ZnCl 2 Heat and dry, then add to a mixture of 20ml octadecene, 4ml oleic acid, 4ml oleylamine and 2ml tri-n-octyl phosphine, heat to 131°C and stir to form a halide solution, after heating the halide solution to 185°C Add 2ml of precursor solution, the reaction time of halide solution and precursor solution is 10s, and generate CsPb 0.64 Zn 0.36 Cl 2.2 Br 0.8 After cooling in the bath quickly, add 2 times the volume of ethyl acetate and perform the first centrifugation, the excess PbCl 2 , ZnC 2 , octadecene, oleic acid, oleylamine, and tri-n-octylphosphonium into ethyl acetate, remove the centrifugation liquid, add...

Embodiment 3

[0035] This embodiment provides a method for preparing an all-inorganic perovskite quantum dot as a blue-violet light source, comprising the following steps,

[0036] 1. Mix and heat 1.25ml oleic acid and 10ml octadecene to 100°C, then add 0.41g Cs 2 CO 3 Mix and stir to form a precursor solution;

[0037] 2. Add 1mmol PbCl 2 , 1mmol PbBr 2 and 1mmol ZnCl 2 Heat and dry, then add to a mixture of 20ml octadecene, 4ml oleic acid, 4ml oleylamine and 2ml tri-n-octylphosphine, heat to 127°C and stir to form a halide solution, after heating the halide solution to 180°C Add 2ml of precursor solution, the reaction time of halide solution and precursor solution is 10s, and generate CsPb 0.67 Zn 0.33 Cl 2 Br was quickly cooled in the bath, and then 2 times the volume of ethyl acetate was added and the first centrifugation was performed, and the excess PbCl 2 , ZnC 2 , octadecene, oleic acid, oleylamine, and tri-n-octylphosphonium into ethyl acetate, remove the centrifugation li...

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Abstract

The invention discloses a preparation method of all-inorganic perovskite quantum dots serving as a blue-violet light source. The method comprises the following steps: heating, mixing and stirring Cs2CO3, oleic acid and octadecene, to form a precursor solution; heating lead halide and zinc halide, adding into a mixed solution of oleic acid, octadecene and oleylamine, heating to T1, and stirring toform a halide solution; heating the halide solution to T2, then adding the precursor solution, carrying out reaction of the halide solution and the precursor solution for t, to form Cs(Pb(1-x)Znx)(AyB(1-y))3, and then rapidly cooling, to obtain a coarse all-inorganic perovskite quantum dots serving as the blue-violet light source, wherein x is greater than 0 and smaller than 1, A and B are Cl, Bror I, and y is greater than or equal to 0 and smaller than or equal to 1. As the components of the precursor solution are not stable, the precursor solution is injected into the halide solution by adopting a hot injection method, a Cs(Pb(1-x)Znx)(AyB(1-y))3 quantum dot solution can be effectively and uniformly formed, and a heating process when the precursor solution starts to react is omitted. Znis used for replacing part of Pb, so that on one hand, the content of Pb in the perovskite can be reduced, and the toxicity of the perovskite is reduced.

Description

【Technical field】 [0001] The invention relates to a method for preparing an all-inorganic perovskite quantum dot as a blue-violet light source, belonging to the field of perovskite quantum dots. 【Background technique】 [0002] Halide perovskites have achieved significant success in applications. Solar cells, light-emitting diodes, and photodetectors have all shown halide perovskites as a new generation of emitter materials with great potential. They have strong photoelectric properties, quantum luminous efficiency can be as high as 95%, and have a very narrow FWHM luminescence peak of about 20nm, which makes them a great advantage in high-quality lighting and display applications. The recently reported synthesis of perovskite QDs uses a wet-chemical colloidal method, and the inorganic perovskite cesium lead halide (CsPbX3, X = Cl, Br, and I) has high thermal stability and low humidity. [0003] Currently CsPbX 3 Most of the quantum dots are synthesized by hot injection un...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/66C01G21/00B82Y40/00
CPCC09K11/665C01G21/006B82Y40/00C01P2002/80
Inventor 孙燕妮岳闯赵振富卫皎汪攀吴君
Owner NINGBO UNIV
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