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Perovskite quantum dot and low-dimensional oxide composite luminescent material, preparation method and application thereof

A technology of perovskite materials and luminescent materials, which is applied in the direction of luminescent materials, chemical instruments and methods, electrical components, etc., can solve the problems of poor stability, difficult synthesis, and few literature reports, and achieve high purity of luminous color and application Effects of broad prospects, fluorescence lifetime, and increased stability

Active Publication Date: 2019-10-11
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, whether it is a bulk structure, or a two-dimensional nanosheet and nanowire, or a zero-dimensional quantum dot structure, due to the inherent sensitivity of ionic crystal perovskite materials to polar solvents and oxygen, the stability is extremely poor.
Moreover, the halide ion exchange between different types of quantum dots in perovskite quantum dots in device applications also limits their practical applications, such as being used as fluorescent materials in white light-emitting diodes
On the other hand, due to the low-dimensional structure of perovskite CsPbX such as two-dimensional nanosheets and nanowires 3 (X=Cl,Br,I) is difficult to synthesize, and there are relatively few literature reports

Method used

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  • Perovskite quantum dot and low-dimensional oxide composite luminescent material, preparation method and application thereof
  • Perovskite quantum dot and low-dimensional oxide composite luminescent material, preparation method and application thereof
  • Perovskite quantum dot and low-dimensional oxide composite luminescent material, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] (1) Accurately weigh 0.2g bulk layered perovskite material (CsCa 2 Ta 3 o 10 ), added to 5.0ml, 1.0mol / L hydrochloric acid, stirred at a constant temperature of 25°C for 60 hours (the stirring speed was 700r / min), evaporated to dryness at 90°C to evaporate the remaining hydrochloric acid solution, and obtained a layered material protonated by hydrochloric acid;

[0046] (2) Add 8.0ml of oleylamine and 2.0ml of ethylamine to the protonated layered material of hydrochloric acid obtained in step (1), and stir at a constant temperature of 25°C for 24h (the stirring speed is 700r / min). layered materials;

[0047] (3) Add 5ml of octadecene (ODE), 1ml of oleic acid (OA), 1ml of oleylamine (OAm), lead chloride (PbCl 2 ) 0.046g and lead bromide (PbBr 2 ) 0.06g was mixed in a 50ml three-neck flask, and 1.0ml trioctylphosphine was added, vacuumized at 80°C for 30min, N 2 Under the atmosphere, stir at 150°C (the rotating speed of stirring is 600r / min) until the lead chloride a...

Embodiment 2

[0051] (1) Accurately weigh 0.2g bulk layered perovskite material (CsCa 2 Ta 3 o 10 ), was added to 10.0ml oleic acid, stirred at 150°C for 10h (rotating speed of stirring was 100r / min), to obtain a protonated layered material of oleic acid;

[0052] (2) Add 5.0ml of oleylamine and 5.0ml of octylamine to the protonated layered material of oleic acid obtained in step (1), and stir at a constant temperature of 50°C for 72h (stirring speed is 100r / min). layered materials;

[0053] (3) 5ml of octadecene (ODE), 1ml of oleic acid (OA), 1ml of oleylamine (OAm), lead bromide (PbBr) 2 )0.12g was mixed in a 50ml three-necked bottle, and vacuumized at 80°C for 10min, N 2 Stir at 120°C under the atmosphere (the stirring speed is 100r / min) until the lead bromide is completely dissolved to obtain a lead solution of lead bromide;

[0054] (4) Add 5ml of octadecene (ODE) to the layered material peeled off in step (2) and mix it in a 50ml three-necked bottle, vacuumize at 80°C for 10min, ...

Embodiment 3

[0057] (1) Accurately weigh 0.2g bulk layered perovskite material (CsCa 2 Ta 3 o 10 ), added to 5.0ml, 3.0mol / L nitric acid, stirred at 25°C for 3 hours (the stirring speed was 1000r / min), evaporated to dryness at 70°C to evaporate the remaining nitric acid solution, and obtained a layered material protonated with nitric acid;

[0058] (2) Add 10.0 ml of oleylamine to the protonated layered material of nitric acid obtained in step (1), stir at a constant temperature of 30°C for 168 hours (the stirring speed is 1000r / min), and peel off the protonated layered material;

[0059] (3) 5ml of octadecene (ODE), 1ml of oleic acid (OA), 1ml of oleylamine (OAm), lead bromide (PbBr) 2 )0.12g was mixed in a 50ml three-neck bottle, and vacuumized at 100°C for 15min, N 2 Stir at 130°C under the atmosphere (the stirring speed is 500r / min) until the lead bromide is completely dissolved to obtain a lead solution of lead bromide;

[0060] (4) Add 5ml of octadecene (ODE) to the layered mater...

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Abstract

The invention belongs to the field of luminescent materials, and discloses a perovskite quantum dot and low-dimensional oxide composite luminescent material, preparation method and an application thereof. The method includes adding a bulk layered perovskite material into an acidic solution to protonate; then adding an organic amine or ammonium solution to strip the protonated layered material; mixing stripped low-dimensional oxide nano sheets with octadecene; raising the temperature to 130-170 DEG C under inert atmosphere; and then injecting a lead halide solution and stirring for reaction, cooling, centrifugally washing and drying to obtain the perovskite quantum dot and low-dimensional oxide composite luminescent material. The composite material has good luminous efficiency and high color purity, has narrow emission peaks at 460nm (blue), 519nm (green) and 658nm (red), and the emission peaks can be adjusted within this range according to halogen components, meanwhile, the fluorescence lifetime is remarkably improved, the composite material is relatively stable in the presence of solid state, and can be used in the fields of white light LED and the like.

Description

technical field [0001] The invention belongs to the field of luminescent materials, and in particular relates to a composite luminescent material of perovskite quantum dots and low-dimensional oxides, as well as its preparation and application. Background technique [0002] CaB 3 (X=Cl, Br, I) perovskite quantum dots are considered to be It is currently an excellent "luminescent material" and has huge potential application prospects in the field of optoelectronics. Due to combining the advantages of perovskite and quantum dots, CsPbX 3 (X=Cl, Br, I) perovskite quantum dots have gradually attracted the attention of researchers at home and abroad. [0003] However, whether it is a bulk structure, or a two-dimensional nanosheet and nanowire, or a zero-dimensional quantum dot structure, due to the inherent sensitivity of ionic crystal perovskite materials to polar solvents and oxygen, the stability is extremely poor. Moreover, the halogen ion exchange between different types...

Claims

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Application Information

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IPC IPC(8): C09K11/67H01L33/50
CPCC09K11/675H01L33/502
Inventor 叶柿万威张勤远
Owner SOUTH CHINA UNIV OF TECH
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