Method for solid-phase synthesis of green fluorescent perovskite

A green fluorescence, solid-phase synthesis technology, applied in chemical instruments and methods, lead compounds, luminescent materials, etc., can solve the problems of specific solvents and complex ligands, final cost increase, etc., to achieve short time consumption and simple synthesis methods. , the effect of easy availability of synthetic raw materials

Active Publication Date: 2020-02-11
YUNNAN UNIV
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  • Claims
  • Application Information

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Problems solved by technology

This production process places high demands on processing conditions, which can lead to a significant increase in th...

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  • Method for solid-phase synthesis of green fluorescent perovskite
  • Method for solid-phase synthesis of green fluorescent perovskite
  • Method for solid-phase synthesis of green fluorescent perovskite

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Embodiment 1

[0020] Embodiment 1: a kind of method of solid phase synthesis green fluorescent perovskite, concrete steps are as follows:

[0021] (1) Mix lysine, cesium bromide, and lead bromide evenly to obtain a mixed powder; wherein the molar ratio of cesium bromide, lysine, and lead bromide is 1:0.2:1;

[0022] (2) Put the mixed powder in a centrifuge tube, then protect the centrifuge tube from light, place the light-proof centrifuge tube in a vortex mixer for oscillating and mixing reaction for 25 minutes, and then place it in the dark for 10 minutes to obtain green fluorescent CsPbBr 3 Material; Wherein the rotating speed of vortex mixer is 3000r / min;

[0023] The present embodiment green fluorescent CsPbBr 3 Material reaction principle: In the synthesis of solution-based colloidal nanocrystals, the key lies in the use of capped ligands to obtain nanocrystals with high emission through solvent-induced reprecipitation; the role of these ligands is to provide crystallized self- Termi...

Embodiment 2

[0027] Embodiment 2: a kind of method of solid phase synthesis green fluorescent perovskite, concrete steps are as follows:

[0028] (1) Mix lysine, cesium bromide, and lead bromide evenly to obtain a mixed powder; wherein the molar ratio of cesium bromide, lysine, and lead bromide is 1:0.08:0.26;

[0029] (2) Put the mixed powder in a centrifuge tube, and then protect the centrifuge tube from light, place the light-proof centrifuge tube in a vortex mixer for 1 minute of oscillating mixing reaction, and then place it in the dark for 5 minutes to obtain green fluorescent CsPbBr 3 Material; Wherein the rotating speed of vortex mixer is 3000r / min;

[0030] The present embodiment green fluorescent CsPbBr 3 The maximum fluorescence emission wavelength of the material is 520nm; the present embodiment green fluorescent CsPbBr 3 Material about 250nm, CsPbBr 3 It is wrapped in lysine to form a spherical structure; the green fluorescent CsPbBr in this example 3 After the material is...

Embodiment 3

[0031] Embodiment 3: a kind of method of solid phase synthesis green fluorescent perovskite, concrete steps are as follows:

[0032] (1) Mix lysine, cesium bromide, and lead bromide evenly to obtain a mixed powder; wherein the molar ratio of cesium bromide, lysine, and lead bromide is 1:3.5:10;

[0033] (2) Put the mixed powder in a centrifuge tube, and then protect the centrifuge tube from light, place the light-proof centrifuge tube in a vortex mixer for 25 minutes of shaking and mixing reaction, and then place it in the dark for 5 minutes to obtain green fluorescent CsPbBr 3 Material; Wherein the rotating speed of vortex mixer is 3000r / min;

[0034] The present embodiment green fluorescent CsPbBr 3 The maximum fluorescence emission wavelength of the material is 520nm; the present embodiment green fluorescent CsPbBr 3 Material about 250nm, CsPbBr 3 It is wrapped in lysine to form a spherical structure; the green fluorescent CsPbBr in this example 3 After the material is ...

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Abstract

The invention discloses a method for solid-phase synthesis of green fluorescent perovskite, and belongs to the technical field of perovskite fluorescent materials. The preparation method comprises: uniformly mixing lysine, cesium bromide and lead bromide to obtain mixed powder; putting the mixed powder into a centrifugal tube, carrying out light-shielding treatment on the centrifugal tube, puttingthe light-shielding centrifugal tube into a vortex mixer, carrying out an oscillating mixing reaction for 1-30 min, and carrying out light-shielding placement treatment for 1-30 min so as to obtain agreen fluorescent CsPbBr3 material; or grinding the mixed powder for 1-5 min or carrying out stirring mixing treatment for 5-30 min to obtain a green fluorescent CsPbBr3 material. According to the invention, high-stability and high-fluorescence-intensity CsPbBr3 is synthesized in one step by using cesium bromide, lysine and lead bromide as synthesis raw materials without a solution substrate, sothat the synthesis method is simple, the synthesis raw materials are easy to obtain, and the consumed time is short.

Description

technical field [0001] The invention relates to a method for solid-phase synthesis of green fluorescent perovskite, which belongs to the technical field of perovskite fluorescent materials. Background technique [0002] Perovskite is well-known in the material world due to its excellent optoelectronic properties. It is currently used in many fields such as photovoltaic cells, solid-state lasers, light-emitting diodes, photodetectors, and solar fuel production. Cesium-lead perovskites usually struggle to maintain their stability under the stimulation of heat, oxygen, moisture, light irradiation, and electric field. While tuning their composition, crystallinity, and internal material strain has been shown to significantly improve the intrinsic stability of materials, their instability to moisture and oxygen remains an outstanding issue that needs to be addressed. The degradation of perovskites is generally initiated from defects at the surface and grain boundaries, which are...

Claims

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Application Information

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IPC IPC(8): C09K11/66C01G21/00
CPCC09K11/665C01G21/006C01P2006/60C01P2004/04C01P2004/62
Inventor 凌剑胡怡琳文秋林刘安勇王俊吴必超普正芬王娟娟
Owner YUNNAN UNIV
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