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A kind of preparation method and product thereof of pure cs4pbbr6 perovskite quantum dot

A quantum dot and perovskite technology, applied in the field of preparation of pure Cs4PbBr6 perovskite quantum dots, can solve the problems of practical application difficulties, poor stability of perovskite quantum dots, etc. , the effect of a wide range of application prospects

Active Publication Date: 2021-11-30
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the invention is to provide a pure Cs with good luminescence performance, ultra-long quantum lifetime and heat resistance 4 PbBr 6 The preparation method of perovskite quantum dots and its products solve the problem of current Cs 4 PbBr 6 Difficulties in practical application caused by poor stability of perovskite quantum dots

Method used

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  • A kind of preparation method and product thereof of pure cs4pbbr6 perovskite quantum dot
  • A kind of preparation method and product thereof of pure cs4pbbr6 perovskite quantum dot
  • A kind of preparation method and product thereof of pure cs4pbbr6 perovskite quantum dot

Examples

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Embodiment 1

[0033] Inject 5ml of oleic acid and 2.5ml of oleylamine into 25mL of acetone solution and let it stand for 6h as a precursor solution. Dissolve 0.212g of cesium bromide and 0.367g of lead bromide in 1ml of deionized water and 4ml of dimethyl sulfoxide respectively. Then add it to the precursor solution, and stir at 1200r / min at room temperature for 10min, then separate at 7000r / min, then purify with 10ml of acetone (aprotic polar purification solvent), separate at 7000r / min, and then re-separate in 60°C air Under the condition of drying for 12h, Cs was obtained 4 PbBr 6 Perovskite quantum dots.

[0034] The Cs prepared in this example 4 PbBr 6 XRD pattern of perovskite quantum dots figure 1 As shown, it can be seen from the figure that its peak type is completely corresponding to the standard card, and there is no appearance of impurity peaks, indicating that pure Cs is prepared in this example 4 PbBr 6 .

[0035] The Cs prepared in this example 4 PbBr 6 Microscopic m...

Embodiment 2

[0039] The preparation method is basically the same as in Example 1, except that the resting time of the precursor solution is changed, and a plurality of resting times are provided, and the resting times are respectively 0, 2, 6 (Example 1), 12, 15 , 24h; then prepare Cs respectively 4 PbBr 6 Perovskite quantum dots, the Cs that embodiment 1 and 2 make 4 PbBr 6 Perovskite quantum dots were tested for luminescence performance, and the results are as follows Figure 6 as shown, Figure 6 It can be seen that the standing time is between 2-15h, the luminous effect is better, and the best standing time is 6h.

Embodiment 3

[0041] Inject 0ml of oleic acid and 2.5ml of oleylamine into 25mL of acetone solution and let it stand for 6 hours as a precursor solution. Dissolve 0.212g of cesium bromide and 0.367g of lead bromide in 1ml of deionized water and 4ml of dimethyl sulfoxide respectively. Then it was added to the precursor solution, stirred at 1200r / min for 10min at room temperature, separated at 7000r / min, purified with 10ml of acetone, separated at 7000r / min, and dried at 60°C for 12h to obtain Cs 4 PbBr 6 Perovskite quantum dots.

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Abstract

The invention discloses a preparation method and product of pure Cs4PbBr6 perovskite quantum dots, comprising the following steps: 1) configuration of precursor solution; 2) configuration of ionic solution; 3) preparation of pure Cs 4 PbBr 6 Perovskite quantum dots: the cesium bromide solution and lead bromide solution in step 2) are added to the precursor solution in step 1), and the reaction is stirred at room temperature. After the reaction is completed, centrifugation is completed to obtain primary Cs 4 PbBr 6 Perovskite quantum dots; 4) Pure Cs is obtained after purification 4 PbBr 6 Perovskite quantum dots. The preparation method of the present invention introduces a small amount of water in the preparation process, so that its luminescence performance and stability are greatly improved, and the prepared Cs 4 PbBr 6 Perovskite quantum dots can emit green light under the excitation of near-ultraviolet and blue light, and the quantum lifetime reaches the microsecond level. The present invention adopts the Cs prepared by the ligand-assisted reprecipitation method 4 PbBr 6 Perovskite quantum dots can be effectively excited by near-ultraviolet rays, have high emission intensity, uniform phase, good thermal stability, and high quantum lifetime.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials, and in particular relates to a preparation method of pure Cs4PbBr6 perovskite quantum dots and a product thereof. Background technique [0002] All-inorganic lead-based perovskite quantum dots are very popular new optoelectronic materials in recent years. The range is wide, and the luminescence in the entire visible light spectrum range (400nm-700nm) can be realized by changing the particle size or adjusting the components; (3) The quantum yield of photoluminescence is high, and the quantum yield can be greater than 90%. All-inorganic lead-based perovskite quantum dots not only exhibit excellent optical properties, but also have stronger stability than other types of perovskite quantum dots (such as organic-inorganic hybrid perovskite quantum dots). Based on the above excellent photoelectric properties, all-inorganic lead-based perovskite quantum dots have received widespread atten...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/66B82Y40/00
CPCB82Y40/00C09K11/665
Inventor 林良武石子宽宋旼
Owner CENT SOUTH UNIV
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