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All-inorganic lead halogen perovskite nano composite luminous material and preparation method and application

A nanocomposite and luminescent material technology, applied in luminescent materials, nano optics, and material analysis through optical means, can solve the problems of fluorescence quenching and poor thermal stability, and achieve high repetition rate, water resistance and heat resistance. Enhanced performance and low reaction temperature

Active Publication Date: 2018-05-15
EAST CHINA NORMAL UNIVERSITY +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0010] The purpose of the present invention is to overcome the disadvantages of traditional oleic acid and oleylamine modified perovskite quantum dots with poor water and thermal stability and serious fluorescence quenching when converted into solid powder, and provide a high imidazole modified perovskite quantum dot. Stable all-inorganic lead halide perovskite nanocomposite luminescent material and its synthesis method

Method used

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  • All-inorganic lead halogen perovskite nano composite luminous material and preparation method and application
  • All-inorganic lead halogen perovskite nano composite luminous material and preparation method and application

Examples

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Embodiment 1

[0033] This example uses a one-step dissolution-precipitation method to synthesize Cs at room temperature 4 PbBr 6 -CsPbBr 3 -imidazole nanocomposite luminescent material, specifically comprising the following steps:

[0034] (1) Weigh the appropriate metal halide salts CsBr and PbBr according to the molar ratio of 0.4 mmol: 0.1 mmol 2 , 8.2 mg of dimethylimidazole as a chelating agent, 0.5 mL of oleylamine and 0.2 mL of oleic acid as a surfactant, were added together in 10 mL of DMF solution, at room temperature (25 ° C), with a speed of 1000 r / min strong Stir magnetically for 24 hours until all reactants are completely dissolved to form a uniform mixed solution as a reaction precursor;

[0035] (2) Quickly add 0.2 mL of the precursor solution in step (1) to 5 mL of toluene solution, and rapidly magnetically stir at room temperature for 3 minutes at a speed of 500-1500 r / min, and react to form a lead-containing all-inorganic perovskite Complex solution;

[0036] (3) The ...

Embodiment 2

[0040] Similar to Example 1, the difference is that the Cs in Example 1 + and Pb 2+ Keep the molar ratio 4:1 unchanged, add CsCl and PbCl 2 , so that the molar ratio of Br:Cl is 1:1, the Cs of the core-shell coating structure can be obtained 4 PbBr 3 Cl 3 -CsPbBr 1.5 Cl 1.5 -Imidazole nanocomposite luminescent material.

[0041] image 3 for Cs 4 PbBr 3 Cl 3 -CsPbBr 1.5 Cl 1.5 - Emission spectrum of imidazole nanocomposite luminescent material under excitation at 365 nm. It can be seen that: 50% of Br - By Cl - After substitution, the luminescent position of the nanocomposite luminescent material blue-shifts from 516nm to 458nm, showing strong blue emission with a half-maximum width of 16nm and good color purity, and the corresponding CsPbBr 1.5 Cl 1.5 The luminescent properties of the nanocrystal solutions remain consistent.

Embodiment 3

[0043] Similar to Example 2, the difference is that CsCl and PbCl in Example 2 2 Changed to CsI and PbI 2 , both can obtain the Cs of the core-shell coating structure 4 PbBr 3 I 3 -CsPbBr 1.5 I 1.5 -Imidazole nanocomposite luminescent material.

[0044] Figure 4 for Cs 4 PbBr 3 I 3 -CsPbBr 1.5 I 1.5 - Emission spectrum of imidazole nanocomposite luminescent material under excitation at 365 nm. It can be seen that: 50% of Br - By I - After substitution, the luminescent position of the nanocomposite luminescent material red shifts from 516nm to 625nm, showing strong red emission with a half-maximum width of 55nm and good color purity, and the corresponding CsPbBr 1.5 I 1.5 The luminescent properties of the nanocrystal solutions remain consistent.

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Abstract

The invention discloses an all-inorganic lead halogen perovskite nano composite luminous material and a preparation method and application. A chemical general formula of the material is Cs4PbX6-CsPbX3-imidazole, X is one or multiple of Cl, Br and I, and imidazole is one or multiple of methyl imidazole, dimethyl imidazole and 4-methylimidazole. The material is composed of CsPbX3 luminous crystal nucleus of 20nm and a Cs4PbX6 frame of 160nm, a capsule-type core-shell structure is formed, and imidazole serves as a chelating agent to chelate with lead ions in Cs4PbX6 through nitrogen-containing groups of imidazole, so that waterproof stability and heatproof stability of the luminous material are improved greatly. The luminous material can be synthesized at room temperature by adopting a one-step precipitation method simple in process. Successful cell fluorescence labeling can be realized under laser irradiation by jointly incubating the luminous material and biological cells. The luminousmaterial is expected to replace conventional rare earth trichromatic phosphor and organic dye, can improve stability of devices and widen color domain of the devices and is of important significance in promoting development of the application field of photoelectric devices and biological fluorescent markers.

Description

technical field [0001] The invention belongs to the technical field of nanocrystalline luminescent materials, and specifically relates to a high-stability all-inorganic lead halide perovskite nanocomposite luminescent material and a preparation method thereof, and its application involves the fields of lighting, display, bioluminescence labeling, solar cells, etc. , is a new type of all-inorganic lead halide perovskite nanocomposite luminescent material with high stability. Background technique [0002] All-inorganic lead-containing perovskite quantum dots have been widely studied and applied in the fields of optoelectronic devices and bioluminescence labeling due to their high fluorescence quantum efficiency, narrow emission, and wide color gamut[1,2]. At present, the thermal injection method and the dissolution-precipitation method are mainly used to synthesize all-inorganic lead-containing perovskite quantum dots. The synthesized quantum dots have good monodispersity, hig...

Claims

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Application Information

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IPC IPC(8): C09K11/02C09K11/66G01N21/64B82Y20/00B82Y30/00
CPCB82Y20/00B82Y30/00C09K11/025C09K11/665G01N21/6486
Inventor 李会利楼孙棋郁彩艳曹蒙蒙
Owner EAST CHINA NORMAL UNIVERSITY
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