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Mn-doped CsPbCl3 perovskite nano-crystals and preparation method thereof

A nanocrystal and perovskite technology, applied in nanotechnology, nano optics, nanotechnology, etc., can solve the problems of reduced Mn ion luminescence performance, uneven size of nanomaterials, and restrictions on practical applications, etc., to achieve uniform size and high quality , Good repeatable effect

Active Publication Date: 2018-11-06
NINGBO UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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  • Mn-doped CsPbCl3 perovskite nano-crystals and preparation method thereof
  • Mn-doped CsPbCl3 perovskite nano-crystals and preparation method thereof
  • Mn-doped CsPbCl3 perovskite nano-crystals and preparation method thereof

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Embodiment 1

[0039] 0.8gCs 2 CO 3 , 2.4mL oleic acid (OA) and 30mL octadecene (ODE) were placed in a round bottom flask, heated to 120°C for 1 hour under vacuum, then heated to 150°C until Cs 2 CO 3 Dissolve completely to obtain the Cs precursor. Put 10mL oleylamine (OAm) and 1mL HCl in a 25mL round-bottomed flask, heat it up to 80°C for 1 hour under vacuum, then raise the temperature to 120°C for 2 hours to get 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-bottomed flask, and the flask was placed in a microwave oven and heated by microwaves in an Ar atmosphere with a power of 400W. When the temperature rose to 150 °C, 0.85 mL of Cs precursor was heated to 100 °C and quickly injected into the above solution. After 5 seconds of reaction, the ice-water bath was taken out to cool down. The prepared Mn 2+ -CsPbCl 3 TEM images of perovskite nan...

Embodiment 2

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

Embodiment 3

[0044] The only difference from Example 1 is that in this example, when the microwave is heated to 190°C in an Ar atmosphere, the Cs precursor is rapidly injected into the solution in the reaction bottle. stated. The Mn that this embodiment makes 2 + -CsPbCl 3 TEM images of perovskite nanocrystals Figure 5 , indicating that the prepared material is a cube, Figure 6 Its corresponding XRD pattern shows that the prepared Mn 2+ -CsPbCl 3 It is orthorhombic phase. As detected by inductively coupled plasma spectroscopy, the actual manganese doping concentration relative to Pb was 6.5% when the reaction temperature was 190°C. Figure 7 Its corresponding fluorescence quantum yield calculation diagram shows that its fluorescence quantum yield is 65%.

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Abstract

The invention relates to a preparation method of Mn-doped CsPbCl3 perovskite nano-crystals and belongs to the technical field of material preparation. The Mn-doped CsPbCl3 perovskite nano-crystals areprepared by a microwave-assisted thermal injection method. The Mn-doped CsPbCl3 perovskite nano-crystals are uniform in size, and the doping concentration of Mn is adjustable and is 0.1-32 percent compared with that of Pb. The Mn-doped CsPbCl3 perovskite nano-crystals prepared by the microwave-assisted thermal injection method are uniform in size and high in quality; the method for preparing theMn-doped CsPbCl3 perovskite nano-crystals, provided by the invention, can quickly synthesize the Mn in large quantities and is simple and controllable in process; through adjusting the reaction temperature, the doping of different concentrations can be effectively achieved, therefore, the repeatability is good.

Description

technical field [0001] The present invention relates to a kind of Mn-doped CsPbCl 3 (Mn 2+ -CsPbCl 3 ) A method for preparing perovskite nanocrystals 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 adjustable in the visible light range, narrower half-width, faster fluorescence lifetime and faster electron mobility, etc., make 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. Manganese-doped perovskites have been reported and show better performance than intrinsic materials. Currently synthesized Mn 2+ -CsPbCl 3 The main method of nanocrystals is the hot injection method. Although this method can obtain nanocrystals with uniform size and excellent optical proper...

Claims

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Application Information

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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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