Perovskite quantum dot material and preparation method thereof

A technology of quantum dot materials and perovskite, which is applied in the direction of luminescent materials, preparation of amino compounds, chemical instruments and methods, etc., to achieve the effects of high stability, simple operation steps and short reaction time

Active Publication Date: 2018-07-06
WUYI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually mesoporous SiO 2 、TiO 2 、Al 2 o 3 It is used to achieve the coating of perovskite, but this kind of material only plays the role of protecting perovskite

Method used

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  • Perovskite quantum dot material and preparation method thereof
  • Perovskite quantum dot material and preparation method thereof
  • Perovskite quantum dot material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A kind of inorganic cesium lead halide quantum dot CsPbX 3 , prepared by the following steps:

[0041] (1) 81.5mg Cs 2 CO 3 , 0.25mL oleic acid and 4mL octadecene were placed in a 25mL three-necked flask, degassed at 120°C for 30min, then heated to 150°C under nitrogen protection, and reacted until Cs 2 CO 3 Dissolving to obtain the precursor solution of Cs-OA;

[0042] (2) 69mg PbBr 2 Add it to the mixed solution of 0.5mL oleic acid, 0.5mL oleylamine and 5mL octadecene, degas at 120°C for 30min, then raise the temperature to 180°C under the protection of nitrogen, and quickly inject 0.4mL of the obtained product in step 1) into it Cs-OA precursor solution, and immediately quench the reaction with an ice-water bath, and then centrifuge at 10000r / min for 10min to obtain CsPbBr 3 .

Embodiment 2

[0044] A kind of inorganic cesium lead halide quantum dot CsPbX 3 , prepared by the following steps:

[0045] (1) 81.5mg Cs 2 CO 3 , 0.25mL oleic acid and 4mL octadecene were placed in a 25mL three-necked flask, degassed at 120°C for 30min, then heated to 150°C under nitrogen protection, and reacted until Cs 2 CO 3 Dissolving to obtain the precursor solution of Cs-OA;

[0046] (2) 29 mg of PbBr 2 and 55 mg of PbI 2 Add it to the mixed solution of 0.5mL oleic acid, 0.5mL oleylamine and 5mL octadecene, degas at 120°C for 30min, then raise the temperature to 180°C under the protection of nitrogen, and quickly inject 0.4mL of the obtained product in step 1) into it Cs-OA precursor solution, and immediately quench the reaction with an ice-water bath, and then centrifuge at 10000r / min for 10min to obtain CsPb(Br 0.4 I 0.6 ) 3 .

Embodiment 3

[0048] An inorganic-organic hybrid perovskite quantum dot MAPbX 3 , prepared by the following steps:

[0049] (1) 17.9mg MABr, 73.4mg PbBr 2 Dissolved in a mixed solvent of 0.5mL oleic acid, 20μL octylamine and 5mL DMF to obtain a precursor solution;

[0050] (2) Take 200 μL of the precursor solution and slowly drop it into 25 mL of toluene, stir vigorously and then centrifuge at 7000r / min for 3min to discard the precipitate, and centrifuge the supernatant again at 15000r / min for 10min to obtain inorganic-organic hybrid perovskite Quantum dot MAPbBr 3 .

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Abstract

The invention discloses perovskite quantum dots and a preparation method thereof. The product is blue, green, yellow and red full-spectrum adjustable fluorescent powder for white-light LEDs (Light Emitting Diodes) suitable for ultraviolet/blue light excitation. By utilizing higher stability of mesoporous hollow CaF2 nanospheres, pre-prepared lead-halogen perovskite quantum dots are adsorbed into the cavities of the CaF2 nanospheres by virtue of the capillary principle, and then, residual solvents are removed under mild conditions so as to finally form the perovskite quantum dots with good stability. The preparation method is simple and fast; furthermore, only one non-polar organic solvent is used, so that the original high fluorescence efficiency of the perovskite quantum dots is well kept; and by combination of traditional rare earth luminescent materials with novel high-efficiency perovskite quantum dots, the obtained product has excellent optical properties and has certain popularization value in solid-phase white-light LEDs for illumination and display.

Description

technical field [0001] The invention belongs to the field of luminescent materials, in particular to a perovskite quantum dot material and a preparation method thereof. Background technique [0002] Due to its high carrier mobility, high quantum efficiency, high color purity, and easy-to-adjust band gap, lead halide perovskite quantum dots are widely used in photodetection, solar cells, lighting, display and other fields. Wide range of applications. However, the crystal structure of perovskite is unstable, and it is easily affected by light, heat, moisture, oxygen, etc., and perovskite will degrade, which in turn affects the efficiency of the device. In addition, the ion exchange between different components of perovskite quantum dots also seriously hinders the practical application of perovskite in the field of luminescence. At present, stability has also become the biggest obstacle to the commercialization of perovskite. Under the premise of maintaining the high-efficie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/66C09K11/02C07C211/15C07C209/00C09K11/06B82Y20/00B82Y40/00C01F11/22
CPCB82Y20/00B82Y40/00C01F11/22C07C209/00C07C211/15C09K11/025C09K11/06C09K11/665C09K11/7773Y02B20/00
Inventor 林君程子泳韦祎曾庆光陈叶青
Owner WUYI UNIV
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