KR102129758B1 - Method for storing organic-inorganic perovskite nanocrystal particles - Google Patents

Abstract

It is possible to provide a storage method of the organic-inorganic perovskite nanocrystalline particles comprising; surface-treating by adding an amine surfactant to the dispersion of the organic-inorganic perovskite nanocrystalline particles.

Description

Storage method of organic-inorganic perovskite nanocrystalline particles{METHOD FOR STORING ORGANIC-INORGANIC PEROVSKITE NANOCRYSTAL PARTICLES}

The present invention relates to a method for storing organic-inorganic perovskite nanocrystalline particles.

Recently, as interest in high-efficiency high-resolution oriented displays and displays aiming to realize high-purity natural colors has increased, interest in perovskite nanocrystalline particles having light-emitting characteristics as well as inorganic quantum dot LEDs (Light Emitting Diodes) has increased. Is increasing.

Among the perovskites, organic-inorganic perovskite nanocrystalline particles exhibit similar luminescence properties to inorganic quantum dots, and are easy to change in composition, and have an advantage of easily controlling the energy band gap.

The organic-inorganic perovskite nanocrystalline particles may be produced in nano-sized, for example, through chemical exfoliation using a surfactant.

In this way, the organic-inorganic perovskite nanoparticles are dispersed in a solvent and stored and distributed. In this dispersion state, they are coarse to microscale in a short time due to spontaneous morphological transformation and do not maintain size uniformity. There is a problem in that the light emission characteristics are lost, and accordingly, there is a difficulty in actual industrial application.

Until now, organic-inorganic perovskite nanocrystalline particle manufacturing technology is focused only on the size control of nanocrystalline particles in the synthesis stage, and research on storage stability after manufacture is very insufficient.

In one aspect of the present invention, the problem that the spontaneous growth of the organic-inorganic perovskite nanocrystalline particles is suppressed and the luminescence properties are lost during long-term storage is solved, and the organic-inorganic perovskite that can improve photon efficiency It is intended to provide a storage method of nanocrystalline particles.

An aspect of the present invention, surface treatment by adding an amine-based surfactant to the dispersion of organic-inorganic perovskite nanocrystalline particles; provides a storage method of organic-inorganic perovskite nanocrystalline particles comprising do.

The amine-based surfactant may be added to the organic-inorganic perovskite nanocrystalline particles in the dispersion of the organic-inorganic perovskite nanocrystalline particles more than three times the number of moles.

The amine-based surfactant may be a primary amine.

The amine-based surfactant may be a C10 or higher primary amine.

The amine-based surfactant may be stearyl amine.

In the surface treatment step, a solution containing an amine surfactant and a solvent may be added dropwise to the dispersion of organic-inorganic perovskite nanocrystalline particles.

In the step of surface treatment by adding an amine-based surfactant to the dispersion of the organic-inorganic perovskite nanocrystalline particles, it may be to further add a carboxylate surfactant.

The diameter of the organic-inorganic perovskite nanocrystalline particles may be 3 nm or more and 30 nm or less.

The organic-inorganic perovskite dispersion, preparing a raw material solution by mixing the raw material, a surfactant, and a solvent of the organic-inorganic perovskite nanocrystalline particles; And precipitating the organic-inorganic perovskite nanocrystalline particles by adding a non-solvent of the organic-inorganic perovskite nanocrystalline particles to the raw material solution.

The perovskite nanocrystalline particles may have a structure of Formula 1 or Formula 2 below.

[Formula 1]

ABX ₃

(In Formula 1, A is a monovalent organic ammonium ion, M is a divalent metal and X is a halogen ion.)

[Formula 2]

A ₂ MX ₄

(In Formula 2, A is a monovalent organic ammonium ion, M is a divalent metal and X is a halogen ion.)

According to the storage method of perovskite nanocrystalline particles of one aspect of the present invention, spontaneous growth of organic-inorganic perovskite nanocrystalline particles is suppressed, so that luminescence properties are not lost during long-term storage, and photon efficiency is greatly improved. Can be.

Accordingly, the actual industrial application of the organic-inorganic perovskite nanocrystalline particles may be possible.

In addition, when preparing dispersions with improved long-term storage properties of organic-inorganic perovskite nanocrystalline particles, the same as those used when preparing nano-sized organic-inorganic perovskite nanocrystalline particles including chemical exfoliation. Since surfactants can be employed, it is possible to solve the conventional problems and contribute to the economical production, storage, and distribution of organic-inorganic perovskite only by adding a very simple process step.

1 is a photoluminescence spectra (PL spectra) and UV-vis absorbance spectra showing the luminescence properties of the organic-inorganic perovskite nanocrystalline particle dispersion prepared in Comparative Example 1 and a scanning electron microscope (Scanning Electron Microscope, SEM) photograph, And transmission electron microscope (Transmission Electron Microscope, TEM, enlarged photo on the upper right in the photo).
2A to 2D are UV-vis showing the luminescence properties of the organic-inorganic perovskite dispersions of Comparative Examples 1 (a, and c) and Example 1 (b, and d) over time. Absorbance spectra and Photoluminescence spectra (PL spectra).
2) e) and f) are data obtained by measuring light emission characteristics and photoluminescence quantum efficiency of Examples 1 to 5.
3 is a photoelectron efficiency of the organic-inorganic perovskite dispersion of Comparative Example 1 (reference), Example 1, Example 6, and Example 7 and the transmission electron microscope (TEM) of the crystal particles .

Unless otherwise defined, all terms (including technical and scientific terms) used in the present specification may be used as meanings commonly understood by those skilled in the art to which the present invention pertains. When a part of the specification "includes" a certain component, this means that other components may be further included instead of excluding other components unless specifically stated otherwise. Also, the singular form includes the plural form unless otherwise specified in the phrase.

In one aspect of the present invention, the spontaneous growth of the organic-inorganic perovskite nanocrystalline particles is suppressed, so that the long-term storage does not lose the luminescence properties, and the organic-inorganic perovskite nanocrystals in which photon efficiency can be greatly improved As a method of storing particles,

It provides a storage method of the organic-inorganic perovskite nano-crystalline particles comprising; surface treatment by adding an amine-based surfactant to the dispersion of organic-inorganic perovskite nanocrystalline particles.

According to the storage method of the organic-inorganic perovskite nanocrystalline particles of one aspect of the present invention, an organic-inorganic perovskite by adding an amine surfactant to the dispersion of the prepared organic-inorganic perovskite nanocrystalline particles By performing the surface treatment of the nano-crystalline nanoparticles, spontaneous growth of the organic-inorganic perovskite nanocrystalline particles is suppressed, and thus excellent luminescence properties can be maintained even after long-term storage.

Furthermore, when comparing before/after surface treatment, photon efficiency can be further improved.

That is, the spontaneous growth of nano-sized organic-inorganic perovskite nanocrystalline particles is suppressed, so that the luminescence properties are not lost during long-term storage, photon efficiency can be greatly improved, and thus organic-inorganic perovskite nano The actual industrial application of crystal grains may be possible.

Adding an amine surfactant to the surface treatment by adding an amine surfactant to the dispersion of the organic-inorganic perovskite nanocrystalline particles is an organic-inorganic additive solution containing a solvent and an amine surfactant. It can be carried out by introducing a dispersion of perovskite nanocrystalline particles.

At this time, the addition of the dispersion solution of the organic-inorganic perovskite nanocrystalline particles can be made dropwise, and by adding the droplets uniformly the organic-inorganic perovskite nanocrystalline particles in the dispersion The effect of the present invention can be maximized by promoting surface treatment.

At this time, the solvent is not particularly limited, but may be, for example, N,N-dimethylformamide (N,N-dimethylformamide, DMF).

At this time, the amount of the amine-based surfactant added may be 3 times or more compared to the number of moles of the organic-inorganic perovskite nanocrystalline particles in the dispersion of the organic-inorganic perovskite nanocrystalline particles.

Specifically, the amount of the amine-based surfactant added may be 3.75 times, 10 times, 15 times or more compared to the number of moles of organic-inorganic perovskite nanocrystalline particles in the dispersion of the organic-inorganic perovskite nanocrystalline particles. have. Here, the upper limit of the amount of the amine surfactant added may be, for example, 30 times or less, or 20 times or less, compared to the number of moles of the organic-inorganic perovskite nanocrystalline particles in the dispersion of the organic-inorganic perovskite nanocrystalline particles. .

When amine-based surfactant is added more than 15 times compared to the number of moles of organic-inorganic perovskite nanocrystalline particles in dispersion, spontaneous growth of organic-inorganic perovskite nanocrystalline particles is suppressed and photon efficiency before/after surface treatment is very high. It can be improved, so it can be good.

The amine-based surfactant may be a primary amine, a secondary amine, or a tertiary amine.

The primary amine can be, for example, hexylamine, octylamine, decylamine, dodecylamine, or stearyl amine.

The secondary amine may be, for example, diethylamine, dihexylamine, dioctylamine, or didecylamine.

The tertiary amine can be, for example, triethylamine, or tributylamine.

Preferably it may be a primary amine, specifically, it may be a primary amine having a branched chain alkyl group.

When surface treatment is performed with primary amines, excellent long-term storage and high photon efficiency are realized. When treated with tertiary amines, long-term storage and photon efficiency can be relatively inferior.

The chained alkyl group may be a C1 to C30 chained alkyl group, more specifically C10 or more, C15 or more, C18 or more, C10 to C30, C15 to C30, C18 to C30, C10 to C20, C15 to C20, or C18 To C20 may be a chain alkyl group.

When surface treatment is performed with a primary amine having a chain alkyl group of C10 or more, or C15 or more, it is good that long-term storage and high photon efficiency can be realized.

The primary amine may be octyl amine or stearyl amine, and more specifically stearylamine.

In addition, in the storage method of the organic-inorganic perovskite nanocrystalline particle dispersion of one aspect of the present invention, the organic-inorganic perovskite nanocrystalline particle dispersion is surfaced with a carboxyl surfactant along with the amine surfactant. Can be processed.

The carboxylate surfactant may be, for example, oleic acid or stearic acid.

In the storage method of an organic-inorganic perovskite nanocrystalline particle dispersion in one aspect of the present invention, the organic-inorganic perovskite nanocrystalline particle dispersion is a ligand-assisted re-precipitation (LARP) method. It may be manufactured by.

Specifically, the organic-inorganic perovskite nanocrystalline particle dispersion is prepared by mixing a raw material, a surfactant, and a solvent of the organic-inorganic perovskite nanocrystalline particles to prepare a raw material solution; And precipitating the organic-inorganic perovskite nanocrystalline particles by adding a non-solvent of the organic-inorganic perovskite nanocrystalline particles to the raw material solution.

Specific process conditions may follow what is commonly known in the art, and are not particularly limited in the present invention.

The organic-inorganic perovskite nanocrystalline particle dispersion is a solvent in the step of preparing a raw material solution by mixing a raw material, a surfactant, and a solvent of the organic-inorganic perovskite nanocrystalline particles, N,N- It may be dimethylformamide (N,N-dimethylformamide, DMF), but is not limited thereto.

The non-solvent may be toluene, isopropyl alcohol, hexane, benzene, chlorobenzene, or a combination thereof. However, the present invention is not limited thereto.

By using a non-solvent for the produced perovskite nanocrystalline particles, the precipitation of perovskite nanocrystalline particles is easy, and there is no need to perform additional processes such as a separate crystallization process such as heat treatment. Since it is possible, the process efficiency can be greatly improved, and there is a very advantageous advantage for mass production.

In the method for producing perovskite nanocrystalline particles of one aspect of the present invention, the surfactant is an alkylamine, an alkylammonium halide, an alkyl acid, an alkyl phosphide, Or a combination thereof. However, the present invention is not limited thereto.

More specifically, the surfactant may be an alkylamine, and more specifically, it may be octyl amine or stearyl amine, but the present invention is not limited thereto.

When preparing the dispersion of organic-inorganic perovskite nanocrystalline particles by the LARP method, the same amine surfactant used as the surface treatment agent of the organic-inorganic perovskite nanocrystalline particle dispersion storage method of the present invention can be used. Can.

In this case, since the same surfactant can be adopted throughout the process, it is possible to solve the conventional problems and contribute to the economical manufacturing, storage, and distribution of organic-inorganic perovskite only by adding a very simple process step. .

In the storage method of the organic-inorganic perovskite nanocrystalline particle dispersion of one aspect of the present invention, the organic-inorganic perovskite nanocrystalline particle may have a structure of Formula 1 or Formula 2.

[Formula 1]

AMX ₃

(In Formula 1, A is a monovalent organic ammonium ion, M is a divalent metal and X is a halogen ion.)

[Formula 2]

A ₂ MX ₄

(In Formula 2, A is a monovalent organic ammonium ion, M is a divalent metal and X is a halogen ion.)

M is located in the center of the unit cell in the perovskite structure, X is located in the center of each surface of the unit cell, forming an octahedron structure around M, A is the unit It may be located at each corner of the cell.

In Formula 1 and Formula 2, M is Cu ^{2 +} , Ni ^{2 +} , Co ^{2 +} , Fe ^{2 +} , Mn ^{2 +} , Cr ^{2 +} , Pd ^{2 +} , Cd ^{2 +} , Ge ²⁺ , Sn ^{2 +} , Pb ^{2 +,} and wherein one or more than one metal ion selected from Yb ^{2 +,} X is Cl ^- may be one or more than one halide ion is selected from ^-, Br ^- and I.

More specifically, Formula 1 may be represented by the following Formula 3 or Formula 4.

[Formula 3]

(R ¹ -NH ₃ ⁺ )MX ₃

In Formula 3, R ¹ is C1-C24 alkyl, C3-C20 cycloalkyl or C6-C20 aryl, and M and X may be the same as in Formula 1.

[Formula 4]

(R ² -C ₃ H ₃ N ₂ ⁺ -R ³ ) MX ₃

In Formula 4, R ² is C1-C24 alkyl, C3-C20 cycloalkyl or C6-C20 aryl, R ³ is hydrogen or C1-C24 alkyl, and M and X may be the same as in Formula 1 .

More specifically, Formula 2 may be represented by the following Formula 5 or Formula 6.

[Formula 5]

(R ¹ -NH ₃ ⁺ ) ₂ MX ₄

In Formula 3, R ¹ is C1-C24 alkyl, C3-C20 cycloalkyl or C6-C20 aryl, and M and X may be the same as in Formula 2.

[Formula 6]

(R ² -C ₃ H ₃ N ₂ ⁺ -R ³ ) ₂ MX ₄

In Formula 4, R ² is C1-C24 alkyl, C3-C20 cycloalkyl or C6-C20 aryl, R ³ is hydrogen or C1-C24 alkyl, and M and X may be the same as in Formula 2 .

The organic-inorganic perovskite nanocrystalline particles may have a diameter of 50 nm or less, more specifically 30 nm or less, even more specifically 3 nm or more and 30 nm or less, or 10 nm or more and 30 nm or less.

According to the storage method of the organic-inorganic perovskite nanocrystalline particles of one aspect of the present invention, the diameter of the organic-inorganic perovskite nanocrystalline particles can be maintained within the above range.

Accordingly, a uniform emission color is maintained, so that high color purity can be achieved and high photon efficiency can be achieved.

The organic-inorganic perovskite nanocrystalline particles may be used in Quantum Dot Light-Emitting Diodes, but are not limited thereto.

Hereinafter, preferred examples and comparative examples of the present invention will be described. However, the following examples are only preferred embodiments of the present invention, and the present invention is not limited to the following examples.

[Comparative Example 1]

0.16 mMol methyl ammonium bromide (MABr), 0.2 mMol lead bromide (PbBr ₂ ) _, 20 μL (0.2mMol) octylamine (n-octylamine) in a Teflon tube (25 mL) , 0.5mL (2mMol) of oleic acid was added, and 5 ml of N,N-dimethylformamide (DMF) was added as a solvent and stirred to dissolve completely.

Subsequently, at room temperature, 0.005 mL of the solution obtained above was added to 10 mL of toluene, a non-solvent for organic-inorganic perovskite nanocrystalline particles, and then stirred at 500 rpm for 10 minutes to CH ₃ NH ₃ PbBr ₃ perovskite Skyt nanocrystalline particles were prepared.

1 is a photoluminescence spectra (PL spectra) and UV-vis absorbance spectra showing the luminescence properties of the organic-inorganic perovskite nanocrystalline particle dispersion prepared in Comparative Example 1 and a scanning electron microscope (Scanning Electron Microscope, SEM) photograph, And transmission electron microscope (Transmission Electron Microscope, TEM, enlarged photo on the upper right in the photo).

The photoluminescence spectra was measured using a Hitachi F-7000 fluorescence spectrometer, and the UV-vis absorbance spectra was measured in a wavelength range of 300-700 nm using Shimadzu UV-2600.

As can be seen in Figure 1, the organic-inorganic perovskite nanocrystalline particle dispersion prepared in Comparative Example 1 lost uniform luminescence properties over time, and the crystal grains of 3-5 nm became coarse to 1 μm or more. .

[Example 1]

The surfactant solution was prepared by adding 0.2mMol n-octylamine and 2mMol oleic acid to 5mL of DMF.

To the dispersion of CH ₃ NH ₃ PbBr ₃ perovskite nanocrystalline particles prepared in Comparative Example 1, 12 drops (0.06 mL) of the surfactant solution were added dropwise.

The amount of n-octylamine injected was 0.0024mMol, which was 15 times the number of moles of perovskite nanocrystalline particles in the perovskite nanocrystalline particle dispersion.

[Example 2]

The surfactant solution was prepared by adding 0.2mMol n-octylamine and 2mMol oleic acid to 5mL of DMF.

8 drops (0.04 mL) of the surfactant solution were added dropwise to the dispersion of CH ₃ NH ₃ PbBr ₃ perovskite nanocrystalline particles prepared in Comparative Example 1. The amount of n-octylamine injected was 0.0016mMol, which was 10 times the number of moles of perovskite nanocrystalline particles in the dispersion of perovskite nanocrystalline particles.

[Example 3]

The surfactant solution was prepared by adding 0.2mMol n-octylamine and 2mMol oleic acid to 5mL of DMF.

5 drops (0.025 mL) of the surfactant solution were added dropwise to the dispersion of CH ₃ NH ₃ PbBr ₃ perovskite nanocrystalline particles prepared in Comparative Example 1. The amount of n-octylamine injected was 0.0010mMol, which was 6.25 times the number of moles of perovskite nanocrystalline particles in the dispersion of perovskite nanocrystalline particles.

[Example 4]

The surfactant solution was prepared by adding 0.2mMol n-octylamine and 2mMol oleic acid to 5mL of DMF.

To the dispersion of CH ₃ NH ₃ PbBr ₃ perovskite nanocrystalline particles prepared in Comparative Example 1, 3 drops (0.015 mL) of the surfactant solution were added dropwise. The amount of n-octylamine added was 0.0006mMol, which was 3.75 times the number of moles of perovskite nanocrystalline particles in the dispersion of perovskite nanocrystalline particles.

[Example 5]

The surfactant solution was prepared by adding 0.2mMol n-octylamine and 2mMol oleic acid to 5mL of DMF.

To the dispersion of CH ₃ NH ₃ PbBr ₃ perovskite nanocrystalline particles prepared in Comparative Example 1, 1 drop (0.005 mL) of the surfactant solution was added dropwise. The amount of n-octylamine injected was 0.0002mMol, which was 1.25 times the number of moles of perovskite nanocrystalline particles in the dispersion of perovskite nanocrystalline particles.

2A to 2D are UV-vis showing the luminescence properties of the organic-inorganic perovskite dispersions of Comparative Examples 1 (a, and c) and Example 1 (b, and d) over time. Absorbance spectra and Photoluminescence spectra (PL spectra).

In the case of Comparative Example 1, the uniform emission characteristics are lost over time, but in Example 1, it can be seen that the uniform emission characteristics are continuously maintained.

2) e) and f) are data obtained by measuring light emission characteristics and photoluminescence quantum efficiency of Examples 1 to 5. When n-octylamine is added more than 3.75 times the number of moles of perovskite nanocrystalline particles in the dispersion of perovskite nanocrystalline particles, it can be seen that uniform light emission characteristics and excellent photon efficiency are realized.

When n-octylamine was added more than 15 times the number of moles of perovskite nanocrystalline particles in the dispersion of perovskite nanocrystalline particles, it exhibited an excellent photon efficiency of 70% or more.

이므로

로 계산할 수 있다. 여기서 아래첨자 R과 P는 각각 reference와 perovskite 물질을 의미하며, Reference 로 9,10-diphenylanthracene (DPA)를 사용하였다. 각 샘플에 대해 Photoluminescence 면적 (excitation wavelength of source light:

_ex = 365 nm)과 Absorbance (

= 365 nm)을 각각 측정하고, 위 방식을 통해 QY를 구하였다. Photoluminescence quantum yield was measured using a comparative method.

Because of

Can be calculated as Here, subscripts R and P refer to reference and perovskite materials, respectively, and 9,10-diphenylanthracene (DPA) was used as a reference. Photoluminescence area for each sample (excitation wavelength of source light:

_ex = 365 nm) and Absorbance (

= 365 nm) respectively, and QY was obtained through the above method.

[Example 6]

The surfactant solution was prepared by adding 0.2mMol stearylamine and 2mMol oleic acid to 5mL of DMF.

It is the same as in Example 1, except that 12 drops of the surfactant solution are added dropwise. The amount of stearylamine injected was 0.0024mMol, which was 15 times the number of moles of perovskite nanocrystalline particles in the dispersion of perovskite nanocrystalline particles.

[Example 7]

The surfactant solution was prepared by adding 0.2mMol triethylamine and 2mMol oleic acid to 5mL of DMF. The same procedure as in Example 1 except that 12 drops of the surfactant solution was added dropwise. The amount of triethylamine injected was 0.0024mMol, which was 15 times the number of moles of perovskite nanocrystalline particles in the dispersion of perovskite nanocrystalline particles.

3 is a photoelectron efficiency of the organic-inorganic perovskite dispersion liquid of Comparative Example 1 (reference), Example 1, Example 6, and Example 7 and Transmission Electron Microscope (TEM) pictures of crystal grains. .

In the case of Examples 1 and 6, which were surface-treated with a primary amine, there was no spontaneous growth of nanocrystalline particles, uniformity of crystal grain size was maintained, and excellent photon efficiency was exhibited.

This is a very good result, exceeding the photon efficiency of 70% of the organic-inorganic perovskite nanocrystalline particles, which are usually produced by chemical exfoliation.

A more preferred case is surface treatment with stearylamine, which is a primary amine of C10 or more, as well as maintaining uniformity of crystal grain size, and showing very good photon efficiency of over 80%.

On the other hand, in the case of Example 7 surface-treated with tertiary amine, spontaneous growth of nanocrystalline particles was observed, and photon efficiency was inferior.

From this, in the organic-inorganic perovskite storage method of the present invention, it can be confirmed that the surface treatment is preferably made of a primary amine, and it is confirmed that it is good to make a primary amine of C10 or higher, in which excellent photon efficiency is realized. Can.

Claims (10)

A method for storage of organic-inorganic perovskite nanocrystalline particles comprising the step of surface-treating by dropwise addition of an amine surfactant to a dispersion of organic-inorganic perovskite nanocrystalline particles. In claim 1,
Storage method of organic-inorganic perovskite nanocrystalline particles in which the amine-based surfactant is added at least three times the number of moles of organic-inorganic perovskite nanocrystalline particles in the dispersion of the organic-inorganic perovskite nanocrystalline particles . In claim 1,
The amine surfactant is a primary amine organic-inorganic perovskite nano-storage method of particles. In claim 1,
The amine-based surfactant is a method of storing organic-inorganic perovskite nanocrystalline particles, which are primary amines of C10 or more. In claim 1,
The amine-based surfactant is a storage method of organic-inorganic perovskite nanocrystalline particles, which is stearyl amine. In claim 1,
In the step of surface treatment, the method for storage of organic-inorganic perovskite nanocrystalline particles is a dropwise addition of a solution containing an amine surfactant and a solvent to a dispersion of organic-inorganic perovskite nanocrystalline particles. In claim 1,
In the step of surface treatment by adding an amine-based surfactant to the dispersion of the organic-inorganic perovskite nanocrystalline particles, storage method of the organic-inorganic perovskite nanocrystalline particles further adding a carboxylate surfactant. In claim 1,
Method for storing organic-inorganic perovskite nanocrystalline particles having a diameter of 3 nm or more and 30 nm or less. In claim 1,
The organic-inorganic perovskite dispersion,
Preparing a raw material solution by mixing the raw material, surfactant, and solvent of the organic-inorganic perovskite nanocrystalline particles; And
It is prepared, including; the step of precipitating the organic-inorganic perovskite nanocrystalline particles by introducing a non-solvent of the organic-inorganic perovskite nanocrystalline particles into the raw material solution. Storage method of inorganic perovskite nanocrystalline particles. In claim 1,
The organic-inorganic perovskite nanocrystalline particles The method of storage of the organic-inorganic perovskite nanocrystalline particles having the structure of Formula 1 or Formula 2.
[Formula 1]
AMX ₃
(In Formula 1, A is a monovalent organic ammonium ion, M is a divalent metal and X is a halogen ion.)
[Formula 2]
A ₂ MX ₄
(In Formula 2, A is a monovalent organic ammonium ion, M is a divalent metal and X is a halogen ion.)

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