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Preparation and application of zero-dimensional halogen perovskite structure material Cs4PbBr6

A technology of perovskite structure and halogen group, which is applied in the direction of luminescent materials, lead compounds, inorganic chemistry, etc., can solve the problems of complex steps, unfavorable, long preparation time, etc., and achieve low cost pressure, reduced dosage, and reduced pressure Effect

Active Publication Date: 2019-12-24
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Using the above method to prepare Cs 4 PbBr 6 The steps are relatively complicated and require a long preparation time, so there are sometimes certain requirements for moisture and oxygen in the environment, which is very important for the rapid and large-scale preparation of Cs 4 PbBr 6 It is unfavorable and limits the industrial application prospect of this kind of material

Method used

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  • Preparation and application of zero-dimensional halogen perovskite structure material Cs4PbBr6
  • Preparation and application of zero-dimensional halogen perovskite structure material Cs4PbBr6
  • Preparation and application of zero-dimensional halogen perovskite structure material Cs4PbBr6

Examples

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Effect test

Embodiment 1

[0034] Example 1: Cs 4 PbBr 6 -Green perovskite materials and preparation of LED devices

[0035]1) Mix 2 mmol CsBr and 0.5 mmol PbBr 2 into a 5 mL test tube;

[0036] 2) Add 10 μL of DMSO dropwise;

[0037] 3) Seal the resulting mixture and put it into an ultrasonic cleaner for 20 minutes of ultrasonic treatment at a power of 200W;

[0038] 4) Dry the product at a temperature of 140°C;

[0039] 5) Take CaAlSiN 3 :Eu 2+ and BaMgAl 10 o 17 : Eu and the product obtained above are uniformly mixed in epoxy resin with a mass ratio of 4:5:9;

[0040] 6) Dispense the uniformly mixed product on the base of the LED, and place it at a temperature of 140°C for curing and packaging.

[0041] Since lead bromide and cesium bromide can spontaneously react to form CsPbBr 3 , but it is easy to crystallize and generate green crystal Cs when saturated solution crystallizes 4 PbBr 6 , so with the help of a very small amount of solvent, lead bromide and cesium bromide reaching the rea...

Embodiment 2

[0045] Example 2: Cs 4 PbBr 6 Preparation of -White perovskite material

[0046] 1) Mix 0.1 mmol of CsBr and 0.025 mmol of PbBr 2 into a 10 mL test tube;

[0047] 2) Add 5 mL of ethanol dropwise to the test tube;

[0048] 3) Seal the resulting mixture and put it into an ultrasonic cleaner for 200 minutes of ultrasonic treatment at a power of 200 W;

[0049] 4) Dry the product at a temperature of 140°C.

[0050] Preparation of Cs by changing different polar solvents 4 PbBr 6 Perovskite materials, from Figure 4 The results of the photoluminescence spectrum shown show that the zero-dimensional perovskite Cs with the same emission wavelength can also be obtained 4 PbBr 6 Material.

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Abstract

The invention discloses preparation and application of a zero-dimensional halogen perovskite structure material Cs4PbBr6. The zero-dimensional halogen perovskite Cs4PbBr6 is synthesized through an ultrasonic-assisted trace polar solvent. Zero-dimensional halogen perovskite Cs4PbBr6 of different structures can be obtained by changing different solvents. The prepared green Cs4PbBr6 material has highPL brightness and a PL service life up to 10 ns. The LED equipment manufactured on the basis of the crystal can cover 32.32% of color gamut. According to the method, the performance of the perovskitematerial is effectively utilized, the wide-color-gamut perovskite LED can be prepared on a large scale under the condition of low cost, and the method is suitable for industrial batch production.

Description

technical field [0001] The invention relates to the technical field of luminescent materials, in particular to a zero-dimensional halogen perovskite structure material Cs 4 PbBr 6 preparation and application. Background technique [0002] 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. [0003] The molecular formula of the perovskite structure can generally be expressed as A n BX 2+n , n=1, 2, 3, 4 correspond to three-dimensional, two-dimensional, one-dimensional and zero-dimensional perovskite structures, respectively. The latest research shows that the three-dimensional perovskite structure ABX 3 (A = CH 3 NH 3+ , Cs + ; X = I - , Br - , Cl - , SCN - ) The photoluminescence quantum yield is not high, such as CsPbX 3 Only 0.1%, and an effective way to increase the photoluminescence quantum yield of perovskite series materials ...

Claims

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Application Information

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IPC IPC(8): C01G21/00C09K11/66H01L33/50
CPCC01G21/006C09K11/665H01L33/504C01P2002/34
Inventor 晏超蒋锦天
Owner JIANGSU UNIV OF SCI & TECH