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A high-performance, strong-limited pure blue cspbbr 3 Quantum dots and their low-temperature preparation methods and applications

A high-performance, quantum dot technology, applied in chemical instruments and methods, semiconductor devices, luminescent materials, etc., can solve the characteristics of perovskite nanocrystals with low soft ion lattice structure, difficulty in obtaining pure blue, and fast nucleation and growth and other problems, to achieve the effects of inhibiting the growth rate of nucleation, rapidly reducing the solution temperature, and excellent spectral stability

Active Publication Date: 2022-07-01
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

[0004] However, CsPbBr 3 Due to the low formation energy and the structural characteristics of the soft ionic lattice, perovskite nanocrystals have extremely fast nucleation and growth, and can usually be formed in a few seconds. It is difficult to obtain pure blue CsPbBr with strong confinement in three dimensions. 3 Perovskite Quantum Dots

Method used

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  • A high-performance, strong-limited pure blue cspbbr <sub>3</sub> Quantum dots and their low-temperature preparation methods and applications
  • A high-performance, strong-limited pure blue cspbbr <sub>3</sub> Quantum dots and their low-temperature preparation methods and applications
  • A high-performance, strong-limited pure blue cspbbr <sub>3</sub> Quantum dots and their low-temperature preparation methods and applications

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Embodiment 1

[0053] like figure 1 As shown, this embodiment provides a high-performance, strong confinement pure blue CsPbBr 3 The low-temperature preparation method of quantum dots includes the following steps:

[0054] (1) Synthesis of precursor solution

[0055] Dissolve 1 mmol of lead bromide and 1 mmol of cesium bromide in 25 mL of N,N-dimethylformamide solvent, and continuously stir for 2 h; add 2.5 mL of oleylamine and 1.25 mL of oleic acid to the mixed solution, and continue to stir for 2 h to obtain the precursor body solution;

[0056] (2) anti-solvent recrystallization

[0057] After mixing 150 μL of hydrogen bromide and 20 mL of toluene, quickly add 100 mL of liquid nitrogen to obtain a low-temperature anti-solvent solution; after 25 s, take 2 mL of the precursor solution and quickly inject it into the anti-solvent solution, the mixed solution is immediately frozen, and after a few seconds , the solid melts, and the solution is collected;

[0058] (3) Purification

[0059...

Embodiment 2

[0061] This embodiment provides a high-performance, strong confinement pure blue CsPbBr 3 The low-temperature preparation method of quantum dots includes the following steps:

[0062] (1) Synthesis of precursor solution

[0063] Dissolve 1 mmol of lead bromide and 1 mmol of cesium bromide in 20 mL of N,N-dimethylformamide solvent, and stir continuously for 3 h; add 2.5 mL of oleylamine and 1.25 mL of oleic acid to the mixed solution, and continue to stir for 3 h to obtain the precursor body solution;

[0064] (2) anti-solvent recrystallization

[0065] After mixing 100 μL of hydrogen bromide and 20 mL of toluene, quickly fill 100 mL of liquid nitrogen to obtain a low-temperature anti-solvent solution; after 25 s, take 2 mL of the precursor solution and quickly inject it into the anti-solvent solution, and the mixed solution is immediately frozen for a few seconds. After the solid melted, the solution was collected;

[0066] (3) Purification

[0067] The rotating speed of ...

Embodiment 3

[0069] This embodiment provides a high-performance, strong confinement pure blue CsPbBr 3 The low-temperature preparation method of quantum dots includes the following steps:

[0070] (1) Synthesis of precursor solution

[0071] Dissolve 2 mmol of lead bromide and 2 mmol of cesium bromide in 50 mL of N,N-dimethylformamide solvent, and continuously stir for 2 h; add 5 mL of oleylamine and 2.5 mL of oleic acid to the mixed solution, and continue to stir for 2 h to obtain the precursor solution;

[0072] (2) anti-solvent recrystallization

[0073] After mixing 300 μL of hydrogen bromide and 60 mL of toluene, quickly fill 120 mL of liquid nitrogen to obtain a low-temperature anti-solvent solution; after 25 s, take 5 mL of the precursor solution and quickly inject it into the anti-solvent solution, and the mixed solution is immediately frozen for a few seconds. After the solid melted, the solution was collected;

[0074] (3) Purification

[0075] The solution collected in step...

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Abstract

The invention discloses a high-performance, strong confinement pure blue CsPbBr 3 A quantum dot and a low-temperature preparation method and application thereof, the preparation method includes the following steps: (1) synthesis of a precursor solution; (2) anti-solvent recrystallization; (3) purification. Cs containing Cs was first prepared by cesium and lead sources without elements other than cesium / lead / bromine + and [PbBr 6 ] 4 The precursor solution of ‑, using the difference between the solubility of the precursor solution in the polar solvent and the non-polar solvent, and using liquid nitrogen to reduce the temperature of the anti-solvent, suppressing the nucleation and growth of the precursor, precipitating crystals, and obtaining pure blue light emission of ultra-small quantum dots. This high-performance, strongly confined pure blue CsPbBr 3 Quantum dots have strong quantum confinement and high exciton binding energy, and have great application prospects in the field of LED devices.

Description

technical field [0001] The invention belongs to the technical field of perovskite quantum dots, and in particular relates to a high-performance, strongly confined pure blue CsPbBr 3 Quantum dots and low temperature preparation methods and applications thereof. Background technique [0002] Lead-halide perovskite nanocrystals have emerged as promising materials for next-generation optoelectronic applications due to their excellent luminescent properties, facile synthetic methods, high luminescent quantum yields, and low defect tolerance. Perovskite light-emitting diodes (PeLEDs) designed using halide perovskite materials have high color purity, continuous emission spectrum, and low production cost, and have become the next-generation light-emitting display technology that is widely concerned by the industry. Solid-state lighting and displays are extremely promising. [0003] At present, the external quantum yield of red and green light has exceeded 20%. However, the develop...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/66B82Y20/00B82Y40/00H01L33/50
CPCC09K11/665B82Y20/00B82Y40/00H01L33/502
Inventor 杨维清曹晶晶吕军闫成李文曾贤侃
Owner SOUTHWEST JIAOTONG UNIV
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