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Inorganic perovskite material, preparation method thereof and LED device

An inorganic calcium and LED chip technology, applied in inorganic chemistry, luminescent materials, semiconductor devices, etc., can solve problems affecting product crystallinity, fluorescence yield and phase purity, and achieve low cost of raw materials, simple synthesis operations, and fluorescence yield. high rate effect

Pending Publication Date: 2021-05-14
TSINGHUA BERKELEY SHENZHEN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cesium tin chloride can be synthesized by hydrothermal method, because the raw material of the product is divalent Sn, it is easy to form CsSnCl in the air 3 Impurities, which seriously affect the product crystallinity and fluorescence yield and phase purity

Method used

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  • Inorganic perovskite material, preparation method thereof and LED device
  • Inorganic perovskite material, preparation method thereof and LED device
  • Inorganic perovskite material, preparation method thereof and LED device

Examples

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Effect test

Embodiment 1

[0037] An inorganic perovskite material, specifically adopting a liquid phase method in figure 1 Prepare and synthesize in the reaction system shown, its concrete preparation method comprises the following steps:

[0038]S1, take by weighing 0.6734g cesium chloride and 0.4010g stannous oxalate, 0.0189g bismuth chloride, put stannous oxalate and bismuth chloride in the double-necked glass flask 11, then inject 5mL concentrated hydrochloric acid thereinto, and put Rotate and stir the magnet; mix cesium chloride and 11ml concentrated hydrochloric acid in a small bottle, and heat the small bottle to 80°C for about 30 minutes in a water bath to obtain a cesium chloride-concentrated hydrochloric acid mixture;

[0039] S2. Put the double-necked glass flask 11 into the oil bath 12 with a heat-collecting constant temperature heating magnetic stirrer, the upper opening of the double-necked glass bottle 11 is connected to the condenser 13, and the side opening is connected to the funnel ...

Embodiment 2

[0044] A kind of inorganic perovskite material, its concrete method comprises the following steps:

[0045] S1, take by weighing 0.6734g cesium chloride and 0.4514mg stannous chloride dihydrate, 0.0189g bismuth chloride, put stannous chloride dihydrate and bismuth chloride into the reaction glass bottle, then inject 5mL ethanol thereinto, Obtain the first mixture; then mix cesium chloride and 11ml of ethanol in a small bottle, and use a water bath to heat the small bottle to 60°C for about 30mins to obtain the second mixture;

[0046] S2. Then raise the temperature of the first mixture obtained in step S1 to 80°C under stirring, and the heating rate is 8°C / min. When the sample is heated to 80°C, open the side opening and pour the second mixture into the reaction glass bottle middle. Close the side opening, and then keep warm for 3 hours;

[0047] S3. After the reaction is completed, the temperature of the material is lowered to room temperature, and the solid product is take...

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Abstract

The invention discloses an inorganic perovskite material, a preparation method thereof and an LED device. The preparation method comprises the following steps that: S1, a tin source and a bismuth source are dissolved in a first solvent to obtain a first solution, and a cesium source is dissolved in a second solvent to obtain a second solution, wherein the tin source is a stannous compound, the cesium source, the tin source and the bismuth source are chlorine sources, and / or the first solvent and the second solvent are chlorine sources; and S2, the first solution and the second solution are mixed, stirring and heating reaction is performed, and then solid-liquid separation, washing and drying are performed. The preparation raw materials are low in cost, safe and non-toxic, the synthesis operation is simple, crystals can be obtained through a heating reaction, the equipment requirement is low, the reaction condition requirement is loose, the product crystallinity is good, particles are uniform, the fluorescence yield is high, and the obtained product inorganic perovskite material does not contain organic groups, is high in light stability and heat stability, has potential application value in preparation of high-fluorescence-yield blue light fluorescent powder, and can be further applied to preparation of LED devices.

Description

technical field [0001] The invention relates to the technical field of photoelectric materials, in particular to an inorganic perovskite material, a preparation method thereof and an LED device. Background technique [0002] Among the existing perovskite materials, two-dimensional hybrid organic-inorganic perovskites (2D-HOIPs) are more typical. The most common synthesis method is the solution cooling method, which is to dissolve the reaction raw materials in a certain proportion in the same In the solution, heat to a certain temperature to completely dissolve, and then cool to crystallize; when the temperature decreases, the solubility of 2D-HOIPs decreases and precipitates from the solution, and in order to control the crystallization speed to obtain crystals with good crystallinity, it is necessary to maintain Constant cooling rate, so the key to obtaining crystals depends on controlling the cooling program, so the synthesis method requires high equipment requirements. I...

Claims

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Application Information

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IPC IPC(8): C01G29/00H01L33/50C09K11/66
CPCC01G29/006H01L33/502C09K11/7435C01P2002/72C01P2004/03C01P2004/61Y02B20/00
Inventor 韦国丹马岚姚越王春云
Owner TSINGHUA BERKELEY SHENZHEN INST
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