A zero-dimensional lead-free perovskite fluorescent material, its preparation and application

A technology of lead-free perovskite and fluorescent materials, applied in the direction of luminescent materials, semiconductor devices, chemical instruments and methods, etc., can solve the problems of inert environment, high-purity raw materials, time-consuming and so on, and achieve fluorescent quantum production The effect of high efficiency, wide emission spectrum, and short reaction time

Active Publication Date: 2021-09-07
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above methods for preparing 0D lead-free perovskites have their own shortcomings, such as time-consuming, inert environment, high temperature and high pressure, high-purity raw materials, etc.

Method used

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  • A zero-dimensional lead-free perovskite fluorescent material, its preparation and application
  • A zero-dimensional lead-free perovskite fluorescent material, its preparation and application
  • A zero-dimensional lead-free perovskite fluorescent material, its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh 0.2982g of KCl powder, 0.0990g of CuCl powder and 0.0584g of NaCl powder into the ball milling tank, then add 3mL of absolute ethanol and 2g of ball milling beads, set the ball milling speed to 1200r / min, and mill at room temperature for 7h, The solid-liquid separation was carried out by centrifugation, and the collected solid was dried at 80°C for 5 hours to obtain the zero-dimensional lead-free perovskite fluorescent material K 2 Cu 0.5 Na 0.5 Cl 3 , the excitation peak is 280nm, the emission peak is 386nm, and has a large Stokes shift, such as figure 2 shown.

Embodiment 2

[0024] Weigh 0.2982g of KCl powder, 0.1584g of CuCl powder and 0.0234g of NaCl powder into the ball milling tank, then add 3mL of absolute ethanol and 3g of ball milling beads, set the ball milling speed to 1500r / min, and mill at room temperature for 3h, The solid-liquid separation was carried out by centrifugation, and the collected solid was dried at 70°C for 4 hours to obtain the zero-dimensional lead-free perovskite fluorescent material K 2 Cu 0.8 Na 0.2 Cl 3 , the excitation peak is 280nm, the emission peak is 386nm, and has a large Stokes shift, such as figure 2 shown.

Embodiment 3

[0026]Weigh 0.2982g of KCl powder and 0.1980g of CuCl powder into the ball milling tank, then add 3mL of ethyl acetate and 4g of ball milling beads, set the ball milling speed to 1000r / min, after ball milling at room temperature for 10min, the solid-liquid Separation, and the collected solid was dried at 60°C for 3 hours to obtain the zero-dimensional lead-free perovskite fluorescent material K 2 CuCl 3 , the excitation peak is 280nm, the emission peak is 386nm, and has a large Stokes shift, such as figure 2 shown. from figure 1 It can be seen from the XRD spectrum in the figure that there is K in the solid matter after ball milling 2 CuCl 3 crystals.

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Abstract

The invention relates to a zero-dimensional lead-free perovskite fluorescent material, its preparation and application, and belongs to the technical field of lead-free perovskite fluorescent materials and light-emitting applications. Fluorescent material K of the present invention x Cu y Na 1‑y Cl 1+x , 0<x≤10, 0<y≤1, has the characteristics of high fluorescence quantum yield, large Stokes shift, and low cost, and can be used as an ultraviolet luminescent material in electroluminescent devices; and the ball-milled solid phase The reaction method is prepared, the operation is simple, the reaction time is short, and it is suitable for mass production.

Description

technical field [0001] The invention relates to a zero-dimensional lead-free perovskite fluorescent material, its preparation and application, and belongs to the technical field of lead-free perovskite fluorescent materials and light-emitting applications. Background technique [0002] Halogen perovskites have attracted great attention due to their important applications in fields such as solar cells and light-emitting diodes. The perovskite material has an adjustable band gap, and its spectrum can cover the near-infrared and visible light spectral regions, making it suitable for applications in the fields of high-efficiency light-emitting diodes and lasers. However, the vast majority of high-performance perovskite materials are based on lead-containing toxic materials, which have potentially harmful effects on the environment. In addition, the poor stability of lead-containing perovskite materials and their devices is a stumbling block hindering their industrialization. T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/61H01L33/50
CPCC09K11/616H01L33/502
Inventor 陈冰昆王涌天刘越张法赵子恒
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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