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A kind of all-inorganic perovskite nanosheet and its preparation method and application

A technology of inorganic calcium and nanosheets, applied in the field of nanomaterials, to achieve the effects of good size uniformity, good stability, and continuously adjustable size

Active Publication Date: 2019-04-02
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among numerous colloidal CsPbX 3 Among the perovskite nanomaterials, the material used as a blue light source is mostly CsPbCl 3 , but there are huge challenges in the synthesis and stability of this material

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  • A kind of all-inorganic perovskite nanosheet and its preparation method and application
  • A kind of all-inorganic perovskite nanosheet and its preparation method and application
  • A kind of all-inorganic perovskite nanosheet and its preparation method and application

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preparation example Construction

[0035] The invention provides a method for preparing all-inorganic perovskite nanosheets, the method comprising the following steps:

[0036] S1. dissolving cesium carbonate in an organic solvent containing oleic acid and octadecene, mixing uniformly, then heating and stirring under an inert gas atmosphere to obtain a cesium oleate solution;

[0037] S2. lead bromide is dissolved in containing oleic acid and oleylamine organic solvent, makes mixed solution, and the reactor that fills this mixed solution is connected to vacuum device, vacuumizes, to remove the impurity in organic solvent (remove Moisture and low boiling point substances), and then pass through the inert gas protection;

[0038] The solutions of steps S1 and S2 were both prepared in a glove box.

[0039] S3. Add the cesium oleate solution prepared in step S1 to the mixed solution in step S2 to obtain a reaction solution;

[0040] S4. The temperature of the reaction solution in step S3 is raised to a set temper...

Embodiment 1

[0051] Such as figure 1 As shown, this embodiment provides an all-inorganic CsPbBr 3 A method for preparing a perovskite nanosheet, comprising the following steps:

[0052] S1. Weigh 0.16g of cesium carbonate solid powder in a glove box and dissolve it in a reactor containing 6mL of octadecene and 0.5mL of oleic acid, raise the temperature to 150°C under the protection of an inert gas and stir to mix evenly to prepare mixture. A three-necked flask can be used as the reactor. After the solution is mixed evenly, the temperature is lowered to 120°C for use.

[0053] In the above system, octadecene acts as a solvent, and high temperature is used to make oleic acid and cesium carbonate fully act to prepare a cesium precursor solution, namely cesium oleate solution. Certainly, the solvent is not limited to the octadecene in this embodiment, and an organic compound containing less than 18 carbons can also be selected as the solvent according to the carbon chain length and the hydr...

Embodiment 2

[0061] The all-inorganic CsPbBr provided by this embodiment 3 The method for preparing perovskite nanosheets differs from Example 1 in that: in step S4, the reaction solution is slowly heated up to 100°C at a rate of 20°C / min under the protection of an inert gas, and immediately freezes within 5 seconds. Cool down in a water bath. The rest of the steps are the same as those in Embodiment 1, and will not be repeated here.

[0062] Such as figure 2 Shown in (b), the CsPbBr with 2 atomic layer thickness prepared by the preparation method of the present embodiment 3 Transmission electron micrograph of perovskite nanoflakes, it can be seen from the figure that the prepared CsPbBr 3 The perovskite nanoflakes have a uniform thickness, enabling them to be ordered into a self-assembled structure; figure 2 (h) and 2(i) are the obtained CsPbBr 3 The thickness and lateral size distribution diagram of perovskite nanoflakes, it can be seen from the figure that the CsPbBr prepared in ...

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Abstract

The invention relates to an all-inorganic perovskite nanosheet and its preparation method and application. The preparation method adopts a precursor solution with cesium added at room temperature, uses an organic solvent as a solvent and a surfactant, and in an inert gas atmosphere, with a certain The heating rate is gradually raised to the set temperature, then rapidly cooled in an ice-water bath, and the all-inorganic CsPbBr is obtained through repeated centrifugation, redispersion, and washing processes. 3 perovskite nanosheets and apply the material to blue LED devices. The present invention controls the reaction kinetics by adjusting the reaction temperature and reaction time, and obtains highly efficient all-inorganic CsPbBr with a thickness of one to five atomic layers. 3 The perovskite nanosheet has a luminous range of 440nm to 470nm, and the invention realizes its application on blue LED devices and has a good application prospect.

Description

technical field [0001] The invention relates to the field of nanometer materials, in particular to an all-inorganic perovskite nanosheet applicable to blue LED devices, a preparation method and application thereof. Background technique [0002] Among a wide variety of semiconductor materials, nanomaterials based on perovskite structures have attracted great attention due to their excellent luminescent properties, such as adjustable luminous range, high luminous efficiency and narrow luminous spectral lines. Perovskite structures generally belong to orthorhombic, tetragonal, and cubic crystal systems. [0003] Organic-inorganic hybrid perovskite CH 3 NH 3 wxya 3 (X=C1, Br, I) can be used to prepare solar cells with an energy conversion efficiency as high as 20% because its absorption spectrum can cover a relatively wide solar spectrum, and the transfer efficiency of electrons and holes is high. As direct bandgap semiconductors, these materials also have the property of em...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G21/16B82Y40/00H01L33/26
CPCB82Y40/00C01G21/16C01P2002/01C01P2002/72C01P2004/04C01P2006/60H01L33/26
Inventor 张桥杨迪曹暮寒徐勇陈磊
Owner SUZHOU UNIV
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