Perovskite moire superlattice self-crystallized glass and preparation method thereof

Abstract

The application discloses a perovskite moire superlattice self-crystallized glass and a preparation method thereof, and belongs to the technical field of solid-state luminescent materials.The chemical composition of the perovskite moire superlattice self-crystallized glass is B2O3:SiO2:PbBr2:CsBr:(Na2CO3+ZnF2) = 3-4:2-3:1-1.5:1-1.5:2 in proportion, the above components are uniformly ground, and after melting and heat preservation forming, the perovskite moire superlattice self-crystallized glass is obtained;the superlattice is introduced into the glass, the optical performance of the glass is improved, a heat treatment process is not needed, the preparation method is simple, energy consumption and cost are saved, and the application is suitable for industrialized production and market popularization and application.

Description

Technical Field

[0001] This invention belongs to the field of solid-state luminescent materials technology, specifically relating to a perovskite moiré superlattice self-crystallizing glass and its preparation method. Background Technology

[0002] Currently, perovskite quantum dot glasses have received widespread attention and application due to their high photoluminescence intensity. However, traditional perovskite quantum dot glasses still have some drawbacks. For example, perovskite quantum dots in glass usually exist as single particles, and single particles typically have low luminescence intensity, thus affecting the luminescence intensity of traditional perovskite quantum dots. Superlattices, macroscopically existing as a component or phase-separated structure within the glass, selectively enter certain coordination structures or ligand structures at the microscopic level to form channel-like or lamellar structures, providing an effective environment for the precipitation and construction of perovskite nanocrystals. Therefore, superlattices can be introduced to improve the properties of traditional perovskite quantum dot glasses. The superlattice phenomenon refers to the phenomenon where individual particles can interact and arrange to form regular large-scale structures under certain conditions, allowing single quantum dots to combine and achieve higher luminescence intensity. Therefore, the introduction of superlattices can alter factors such as the crystal structure, particle size, and surface modification of the material, thereby improving its optical and electrical properties. In addition, superlattices, as a macroscopic quantum state, are structurally composed of nanocrystals arranged periodically in two or three dimensions. Under excitation light, the luminescent centers of quantum dots within the superlattice structure achieve collective emission of photoexcited dipoles through dipole-dipole Coulomb coupling and quantum resonance effects. This collective coupling can produce short, intense light radiation, i.e., superfluorescence. Superfluorescence emits bright fluorescent signals, which is helpful for detecting and observing the structure and activity of cells and tissues, and can be used for bioimaging. For example, superfluorescent quantum dots such as carbon dots are applied in biological tissue imaging and cancer cell detection. Simultaneously, superfluorescence also shows excellent results in the fabrication of high-efficiency optoelectronic devices, such as solar cells and organic light-emitting diodes, as well as in chemical sensors for detecting pollutants, biomolecules, and drugs.

[0003] Heat treatment is usually required when preparing superlattice glasses. For example, patent application number 201910221234.1 discloses a CsPbBr3 quantum dot superlattice structure glass and its preparation method. The original glass is obtained by melting, and the original glass is annealed and heat-treated to obtain a CsPbBr3 quantum dot superlattice structure glass. However, heat treatment requires a lot of energy. If heat treatment is not performed, self-crystallization will only occur in specific grid structures, making it impossible for the superlattice to be uniformly incorporated into the glass.

[0004] Therefore, it is necessary to provide a self-crystallizing perovskite moiré superlattice glass and its preparation method. By adjusting the glass composition and preparation parameters, the heat treatment process can be eliminated, thereby saving energy consumption, shortening the superlattice glass preparation process, reducing preparation costs, and providing a broader application prospect for perovskite glass. Summary of the Invention

[0005] To overcome the problems in the prior art, the present invention provides a perovskite moiré superlattice self-crystallizing glass for application in optoelectronic devices, bioimaging and other fields.

[0006] The chemical composition of the perovskite moiré superlattice self-crystallizing glass, calculated in proportion, is as follows:

[0007] The ratio of B2O3:SiO2:PbBr2:CsBr:(Na2CO3+ZnF2) is 3~4:2~3:1~1.5:1~1.5:2.

[0008] Another aspect of the present invention provides a method for preparing a self-crystallizing perovskite moiré superlattice glass. The preparation method includes: weighing the corresponding components according to the chemical composition of the self-crystallizing perovskite moiré superlattice glass, grinding them thoroughly and uniformly, then melting the uniformly ground material at high temperature under air atmosphere to obtain a molten liquid, pouring the molten liquid into a forming table for heat preservation, and removing the internal stress in the glass to obtain a formed self-crystallizing perovskite moiré superlattice glass.

[0009] Preferably, the melting temperature is 1100-1150℃, the melting time is 10-20 min, the molding table holding temperature is 280-300℃, and the holding time is 5-10 min.

[0010] The beneficial effects of this invention are:

[0011] 1. The perovskite moiré superlattice self-crystallizing glass of the present invention introduces a moiré superlattice, which enables the glass to exhibit superfluorescence, high fluorescence intensity, and good application effect.

[0012] 2. In the process of preparing perovskite moiré superlattice self-crystallizing glass, the present invention does not require heat treatment, the preparation process is simple, effectively reduces energy consumption, saves costs, and is beneficial to industrial production applications. Attached Figure Description

[0013] Figure 1 The emission spectrum of the perovskite moiré superlattice self-crystallizing glass of the present invention is shown under excitation by a 468nm light source.

[0014] Figure 2 The emission pattern of the perovskite moiré superlattice self-crystallizing glass of the present invention under excitation by a 468 nm light source.

[0015] Figure 3This is a transmission electron microscope image of the self-crystallizing glass of the perovskite moiré superlattice of the present invention. Detailed Implementation

[0016] The present invention will be further described in detail below with reference to specific embodiments.

[0017] Example 1: The raw materials were weighed according to the ratio of B2O3:SiO2:PbBr2:CsBr:(Na2CO3+ZnF2)=4:3:1:1:2, mixed and ground evenly. The ground material was transferred to a corundum crucible and calcined at 1150℃ for 10 minutes. Then the molten glass was taken out and poured onto a heating platform and kept at 300℃ for 5 minutes to obtain a formed perovskite moiré superlattice self-crystallizing glass.

[0018] The glass was removed from the heating stage for the experiment. Excited by a 468nm light source, the glass emitted a bright green light, as shown in the image. Figure 2 As shown, it exhibits good color rendering properties, and its emission spectrum under 468nm light source excitation is as follows. Figure 1 As shown, two luminescent centers appear around 512nm and 525nm, which are consistent with the emission spectrum when the superlattice is formed, indicating that the superlattice can be successfully and uniformly incorporated into the glass without heat treatment using the method of the present invention.

[0019] like Figure 3 As shown, a distinct superlattice phenomenon appears in its microstructure, with obvious aggregation of lattice fringes.

[0020] Example 2: The raw materials were weighed according to the ratio of B2O3:SiO2:PbBr2:CsBr:(Na2CO3+ZnF2)=3:2:1.5:1.5:2, mixed and ground evenly. The ground material was transferred to a corundum crucible and calcined at 1100℃ for 20 minutes. Then the molten glass was taken out and poured onto a heating platform and held at 280℃ for 10 minutes to obtain a formed perovskite moiré superlattice self-crystallizing glass.

[0021] Example 3: The raw materials were weighed according to the ratio of B2O3:SiO2:PbBr2:CsBr:(Na2CO3+ZnF2)=3.5:2.5:1.2:1.2:2, mixed and ground evenly. The ground material was transferred to a corundum crucible and calcined at 1120℃ for 15 minutes. Then the molten glass was taken out and poured onto a heating platform and held at 290℃ for 8 minutes to obtain a formed perovskite moiré superlattice self-crystallizing glass.

[0022] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of the present invention.

Claims

1. A perovskite moiré superlattice self-crystallizing glass, characterized in that: The chemical composition of the perovskite moiré superlattice self-crystallizing glass is as follows: B2O3:SiO2:PbBr2:CsBr:(Na2CO3+ZnF2) = 3~4:2~3:1~1.5:1~1.5:2; The method for preparing the self-crystallizing perovskite moiré superlattice glass includes weighing the corresponding components according to the chemical composition of the self-crystallizing perovskite moiré superlattice glass, grinding them thoroughly and evenly, then melting the evenly ground material at high temperature under air atmosphere to obtain a molten liquid, pouring the molten liquid into a forming table and keeping it at a constant temperature to obtain the self-crystallizing perovskite moiré superlattice glass. The melting temperature is 1100~1150℃, the melting time is 10~20min, the molding table holding temperature is 280~300℃, and the holding time is 5~10min.

Images