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A high stability two-dimensional cationic lead halide material and its preparation and application

A high-stability, cationic technology, applied in the field of fluorescent materials, can solve the problems of high LED quantum conversion efficiency, large demand for rare earth materials, aperture effect, moisture, air and heating instability, etc., to overcome self-absorption of luminescence And the effect of unstable luminous color, intact appearance and structure, and easy operation

Active Publication Date: 2020-07-28
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many problems in this lighting scheme, for example, the mixing of various monochromatic light sources will lead to energy loss, the requirement for LED quantum conversion efficiency is extremely high, and the driving voltage, life and temperature characteristics of each primary color LED are different
Second, the blue LED excites the yellow phosphor to form white light. This method still has major problems such as low color rendering index, large amount of rare earth materials and aperture effect.
Two-dimensional perovskites with a small amount of 110 crystal planes exhibit inherent broadband white light emission properties. Mechanistic studies have shown that this broadband emission comes from self-trapped excitons generated by material lattice distortion, but due to the existence of perovskites on moisture , air and heating instability problems, so that its application is greatly limited

Method used

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  • A high stability two-dimensional cationic lead halide material and its preparation and application
  • A high stability two-dimensional cationic lead halide material and its preparation and application
  • A high stability two-dimensional cationic lead halide material and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Material [PbF + ][ - o 2 C(CH 2 ) 4 CO 2 - ] 0.5 Preparation and performance investigation:

[0040] Material [PbF + ][ - o 2 C(CH 2 ) 4 CO 2 - ] 0.5 Preparation of:

[0041] Weigh 0.272g PbF 2 , 0.528g disodium adipate, dissolve it in 8mL water, measure 230mL perchloric acid and add the above solution, stir the obtained suspension for 30 minutes to make it evenly mixed, and transfer the uniform suspension to a volume of 12mL In the autoclave and sealed well, put it in an oven with a constant temperature of 150°C to react for 48 hours; after the reaction, take out and open the autoclave, transfer the obtained solid to a beaker, wash with 20mL of water and 20mL of ethanol in turn, and then dry it in the air , to get the material [PbF + ][ - o 2 C(CH 2 ) 4 CO 2 - ] 0.5 .

[0042] The properties of the material obtained in this embodiment are white crystals. Confirmed by X-ray single crystal diffraction characterization, the frame connection stru...

Embodiment 2

[0048] Material [PbCl + ][ - o 2 C(CH 2 ) 4 CO 2 - ] 0.5 Preparation and performance investigation:

[0049] Material [PbCl + ][ - o 2 C(CH 2 ) 4 CO 2 - ] 0.5 Preparation of:

[0050] Weigh 0.417g PbCl 2 , 0.570g disodium adipate, dissolve it in 8mL water, measure 430mL perchloric acid and add the above solution, stir the obtained suspension for 30 minutes to make it evenly mixed, and transfer the uniform suspension to a volume of 15mL In the autoclave and sealed well, put it in an oven with a constant temperature of 175°C to react for 48 hours; after the reaction, take out and open the autoclave, transfer the obtained solid to a beaker, wash with 20mL of water and 20mL of ethanol in turn, and then dry it in the air , to obtain the material [PbCl + ][ - o 2 C(CH 2 ) 4 CO 2 - ] 0.5 .

[0051] The properties of the material obtained in this embodiment are white crystals. Confirmed by X-ray single crystal diffraction characterization, the frame connecti...

Embodiment 3

[0057] Material [PbBr + ] 3 (H 2 O)[ - o 2 C(CH 2 ) 4 CO 2 - ] 1.5 Preparation and performance investigation:

[0058] Material [PbBr + ] 3 (H 2 O)[ - o 2 C(CH 2 ) 4 CO 2 - ] 1.5 Preparation of:

[0059] Weigh 0.551g PbBr 2 , 0.570g disodium adipate, dissolve it in 8mL water, measure 430mL perchloric acid and add the above solution, stir the resulting suspension for 30 minutes to make it evenly mixed, and transfer the uniform suspension to a volume of 20mL In the autoclave and sealed well, put it in an oven with a constant temperature of 175°C to react for 48 hours; after the reaction, take out and open the autoclave, transfer the obtained solid to a beaker, wash with 20mL of water and 20mL of ethanol in turn, and then dry it in the air , to obtain the material.

[0060] The properties of the material obtained in this embodiment are white crystals. Confirmed by X-ray single crystal diffraction characterization, the frame connection structure of the mater...

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PUM

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Abstract

The invention relates to a high-stability two-dimensional positive-ion lead halide material, a preparation method thereof and an application of the material. The chemical formula of the material is [PbX<+>]n(H2O)m[<->O2C(CH2)4CO2<->]0.5n, wherein X is F, Cl or Br, n is a positive integer, and m is a natural number. When the material is prepared, lead halide and adipic acid disodium salt are addedinto water and mixed with perchloric acid, hydrothermal reaction is performed, and mixture is sequentially cooled, filtered, washed and dried to obtain the material. The material serves as a single-component phosphor and is used for the field of white-light LEDs (light-emitting diodes). Compared with the prior art, the material is high in structure stability and resistant to acid, alkali and hightemperature and has high-distortion two-dimensional lead halide inorganic layers and inherent substrate white-light emitting property covering a visible light range. The material has great applicationpotential in the field of the white-light LEDs and is easy to prepare.

Description

technical field [0001] The invention belongs to the technical field of fluorescent materials, and relates to a highly stable two-dimensional cationic lead halide material and its preparation and application. Background technique [0002] Most of the inorganic extended topological materials existing in nature and artificially synthesized, such as zeolite molecular sieves, metal oxides and metal phosphates, all present anionic or neutral main frame structures. The main reason is that these porous pure inorganic frameworks are composed of positively charged metal centers and negatively charged bridging ligands (usually oxygen atoms), and the normal ratio of coordination between the two and the number of charges determine the extension of the main framework. It can only be presented as neutral or anionic, while neutral guest molecules or positively charged guest ions are interposed in the pore in the form of non-covalent bonds. Compared with the porous anionic inorganic framewo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G83/00C09K11/06
CPCC08G83/008C09K11/06C09K2211/188Y02B20/00
Inventor 费泓涵庄泽文彭成栋张贵阳杨慧敏尹金麟
Owner TONGJI UNIV
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