An Mn-doped CSPBcl 3 Perovskite nanocrystal and preparation method thereof

A nanocrystal and perovskite technology, applied in nanotechnology, nanooptics, nanotechnology, etc., can solve the problems of reduced Mn ion luminescence performance, uneven size of nanomaterials, and limited practical application, and achieve uniform size and high quality. , good repeatability

Active Publication Date: 2022-05-27
NINGBO UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, since the current microwave-based synthesis of perovskite is based on the one-pot method, that is, all the raw materials are put together for microwave heating synthesis, which leads to the simultaneous nucleation and growth of nanocrystals, resulting in different sizes of synthesized nanomaterials. uniform, low quality, especially for Mn-doped nanocrystals, due to continuous heating will have been incorporated into the perovskite CsPbCl 3 The Mn ions in the matrix are gradually expelled, resulting in a significant decrease in the luminescence performance of the Mn ions, which greatly limits its practical application.

Method used

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  • An Mn-doped CSPBcl <sub>3</sub> Perovskite nanocrystal and preparation method thereof
  • An Mn-doped CSPBcl <sub>3</sub> Perovskite nanocrystal and preparation method thereof
  • An Mn-doped CSPBcl <sub>3</sub> Perovskite nanocrystal and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] 0.8gCs 2 CO 3 , 2.4 mL of oleic acid (OA) and 30 mL of octadecene (ODE) were placed in a round-bottomed flask, heated to 120 °C for 1 h under vacuum, and then heated to 150 °C until Cs 2 CO 3 Completely dissolved to obtain Cs precursor. Put 10 mL of oleylamine (OAm) and 1 mL of HCl in a 25 mL round-bottomed flask, raise the temperature to 80 °C for 1 h under vacuum, and then heat up to 120 °C for 2 h to obtain RNH 3 Cl precursor.

[0040] Take 111mg PbCl 2 ,50mg MnCl 2 , 13mL ODE, 2mL DGBE, 2mL OA, 2mL OAm, 2mL TOP and 2mL RNH 3 The Cl precursor (heated to 100°C first) was placed in a 25mL round-bottom flask, and the flask was placed in a microwave oven and heated by microwave in an Ar atmosphere with a power of 400W. When the temperature rises to 150°C, 0.85 mL of Cs precursor is heated to 100°C and rapidly injected into the above solution, reacted for 5s, and then taken out of an ice-water bath to cool down. prepared Mn 2+ -CsPbCl 3 TEM image of perovskite n...

Embodiment 2

[0042] The only difference from Example 1 is that in this example, when microwave heating in an Ar atmosphere to 170° C., the Cs precursor was rapidly injected into the solution of the reaction bottle. described. Mn prepared in this example 2 + -CsPbCl 3 TEM image of perovskite nanocrystals image 3 , indicating that the prepared material is cubic, Figure 4 Its corresponding XRD pattern shows that the as-prepared Mn 2+ -CsPbCl 3 For the oblique phase. The actual manganese doping concentration relative to Pb was 4.9% when the reaction temperature was 170 °C, detected by inductively coupled plasma spectroscopy. Its fluorescence quantum yield was 39%.

Embodiment 3

[0044] The only difference from Example 1 is that in this example, when microwave heating in an Ar atmosphere to 190° C., the Cs precursor was rapidly injected into the solution of the reaction bottle. described. Mn prepared in this example 2 + -CsPbCl 3 TEM image of perovskite nanocrystals Figure 5 , indicating that the prepared material is cubic, Image 6 Its corresponding XRD pattern shows that the as-prepared Mn 2+ -CsPbCl 3 For the oblique phase. The actual manganese doping concentration was 6.5% relative to Pb when the reaction temperature was 190°C, detected by inductively coupled plasma spectroscopy. Figure 7 The corresponding fluorescence quantum yield calculation chart shows that its fluorescence quantum yield is 65%.

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Abstract

The present invention relates to a kind of Mn-doped CsPbCl 3 A method for preparing perovskite nanocrystals belongs to the technical field of material preparation. The Mn-doped CsPbCl 3 Perovskite nanocrystals were prepared by microwave-assisted thermal injection. The Mn-doped CsPbCl 3 The size of the perovskite nanocrystal is uniform, the doping concentration of Mn is adjustable, and the doping concentration of Mn is 0.1-32% relative to Pb. Mn-doped CsPbCl prepared by microwave-assisted thermal injection in the present invention 3 Perovskite nanocrystals have uniform size and high quality; provide Mn-doped CsPbCl 3 The method of perovskite nanocrystals can quickly synthesize a large amount of Mn, and the process is simple and controllable. By adjusting the reaction temperature, different concentrations of doping can be effectively achieved, with good repeatability.

Description

technical field [0001] The present invention relates to a kind of Mn-doped CsPbCl 3 (Mn 2+ -CsPbCl 3 ) The preparation method of perovskite nanocrystal belongs to the technical field of material preparation. Background technique [0002] All-inorganic CsPbX 3 (X=Br,Cl,I) perovskite due to its excellent optical properties, such as: continuously tunable in the visible light range, narrower half-peak width, faster fluorescence lifetime and faster electron mobility, etc. It has good application prospects in the fields of solar cells, light-emitting diodes, lasers, and photoelectric detection. Mn ion doping can give semiconductor materials new optical and electromagnetic properties. Mn-doped perovskites have been reported and show better properties than intrinsic materials. Mn is currently synthesized 2+ -CsPbCl 3 The main method of nanocrystals is thermal injection. Although this method can obtain nanocrystals with uniform size and excellent optical properties when prepar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/66B82Y20/00B82Y40/00
CPCC09K11/665B82Y20/00B82Y40/00
Inventor 郑金桔刘文娜尚明辉杨祚宝杨为佑
Owner NINGBO UNIVERSITY OF TECHNOLOGY
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