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Method for controlling light wavelength of full-inorganic perovskite quantum dots

A technology of quantum dot luminescence and inorganic calcium, which is applied in the chemical industry to achieve the effects of easy operation, improved optical performance and improved optical performance

Inactive Publication Date: 2017-06-30
JILIN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, previous reports did not systematically study the effects of heat treatment on the luminescence spectra of perovskite nanocrystals.

Method used

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  • Method for controlling light wavelength of full-inorganic perovskite quantum dots
  • Method for controlling light wavelength of full-inorganic perovskite quantum dots
  • Method for controlling light wavelength of full-inorganic perovskite quantum dots

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Step 1: Mix 0.2mmol PbBr at room temperature 2 and 5mL of octadecene were added to a 50mL three-necked flask to obtain a mixed solution;

[0040] Step 2: evacuate multiple times and feed inert gas to remove residual gas in the reaction vessel, and add 0.5 mL of oleylamine and 0.5 mL of oleic acid to the mixed solution obtained in Step 1 under an argon atmosphere;

[0041] Step 3: Raise the reaction temperature to 140°C, and quickly add 0.25ml cesium precursor solution, (cesium precursor solution consists of 2mmol Cs 2 CO 3 In 2.5mL oleic acid and 17.5mL octadecene), keep this temperature for 5 seconds, stop heating and cool down. Add 5mL of toluene to the mixed reaction solution, and add 10mL of tert-butanol to centrifuge at a speed of 5000 rpm to obtain a precipitate. Repeat this step 2-3 times to obtain a precipitate that is CsPbBr 3 Quantum dots, then add toluene solvent to prepare a quantum dot solution.

[0042] Step 4: CsPbBr obtained in Step 3 3 Draw 6-10 μL...

Embodiment 2

[0047] The reaction conditions and operation steps are the same as in Example 1, except that the temperature of the temperature controller in step 5 is set to 110°C.

Embodiment 3

[0049] The reaction conditions and operation steps are the same as in Example 1, except that the temperature of the temperature controller in step 5 is set to 90°C.

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Abstract

The invention discloses a method for controlling light wavelength of full-inorganic perovskite quantum dots. PbBr2 and octadecene are mixed and a mixed solution I is obtained; oleylamine and oleic acid are added to the mixed solution I in an inert environment, and a mixed solution II is obtained; the reaction temperature is increased to 120-160 DEG C, a caesium precursor solution is quickly added to the mixed solution II, the temperature is kept for 5 s, quantum dots are dispersed in a solvent, and a CsPbBr3 quantum dot solution is obtained; the CsPbBr3 quantum dot solution is dropped and applied to a silicon substrate cleaned in advance, and a film sample is formed; the film sample is placed in a vacuum device to be heated, and the light wavelength of full-inorganic perovskite quantum dots is controlled. The method is simple to operate, the size of the CsPbBr3 quantum dots can be changed after heat treatment, and the light wavelength is adjustable.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a method for adjusting and controlling the light-emitting wavelength of all-inorganic perovskite quantum dots. Background technique [0002] In recent years, all-inorganic lead halide perovskites such as CsPbBr 3 (X=Cl, Br, I) nanocrystals have outstanding characteristics such as solution preparation, easy processing, and high quantum yield, which make them widely used in the fields of photodetection, photocatalysis, radiation detection, light-emitting diodes, solar cells, and fluorescent labels. application prospects. As a new type of luminescent material, perovskite quantum dots have a quantum luminous efficiency of up to 90% and a narrow half-width (less than 50nm). Compared with previously known cadmium-based core / shell quantum dots, CsPbBr 3 The composition and size of quantum dots can be adjusted based on anion exchange reaction and high-temperature ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/61C01G21/00
CPCC01G21/006C01P2004/32C01P2004/64C09K11/616
Inventor 赵家龙侯学敏袁曦李海波
Owner JILIN NORMAL UNIV
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