Preparation method of novel organic-inorganic molybdenum-based hybrid perovskite material

Abstract

Although the perovskite material has remarkable advantages in the field of near infrared (NIR) luminescence, some key defects still exist, and the practical application of the perovskite material is limited. The following main defects and root analysis are as follows: the stability problem (core challenge) lead-based perovskite (such as MAPbI3) is easy to decompose into PbI2 and organic salt when encountering water, and NIR luminescence is rapidly attenuated. In tin-based perovskite (such as MASnI3), Sn < 2 + > is easier to oxidize into Sn < 4 + >, resulting in material failure. In order to solve the problems, an organic material and an organic molecule are selected to replace a traditional A-site inorganic element, metal Mo < 4 + > is used to replace a traditional B-site lead base, the (C8H22N2Cl) 2MoCl5CH3 organic-inorganic lead-free perovskite near-infrared luminescent material is synthesized, and the material has important significance on research on the luminescent property and luminescent property of novel lead-free perovskite.

Description

Technical Field

[0001] This invention belongs to the field of perovskite luminescent materials, specifically relating to a method for preparing organic-inorganic hybrid perovskite near-infrared luminescent materials. Background Technology

[0002] Perovskite materials (especially metal-organic perovskites) exhibit great potential in near-infrared (NIR, typically referring to the 700-2500 nm wavelength range) luminescence due to their excellent photoelectric properties (such as high luminous efficiency, tunable bandgap, and low-cost solution preparation). Perovskite materials have a strong absorption capacity for near-infrared light, enabling efficient conversion of light energy into electrical energy or other forms of energy, which is significant in applications such as photodetection and energy conversion. Simultaneously, their high carrier mobility allows for rapid carrier migration within perovskite materials, reducing carrier recombination losses and improving luminous efficiency, thus facilitating high-brightness near-infrared luminescence. Furthermore, perovskite materials possess high fluorescence quantum yields in the near-infrared region, enabling the conversion of more excitation energy into useful luminescence, thereby improving the efficiency of light-emitting devices.

[0003] Perovskite materials offer both performance and cost advantages in near-infrared luminescence, showing great potential, especially in biomedicine and optoelectronic devices. Despite challenges related to stability and toxicity, their applications are rapidly expanding through materials design and device engineering. In the future, with the maturation of lead-free material systems, perovskite is expected to become one of the core materials for NIR technology. Summary of the Invention

[0004] Organic-inorganic hybrid perovskites (OIHPs) exhibit unique advantages in near-infrared (NIR) emission, stemming from their distinctive hybrid structure and tunable compositional properties. By synergistically modulating the organic / inorganic components, the crystal structure and electronic energy levels of OIHPs can be adjusted to extend the emission wavelength to 700-1000 nm (e.g., the ~800 nm emission of FAPbI3). Preliminary studies have been conducted on the application of perovskite luminescent materials in LEDs. This invention is the first to develop a novel organic-inorganic hybrid perovskite near-infrared luminescent material (C8H). 22 N2Cl)2MoCl5CH3 and its method for developing novel, highly efficient luminescent materials have contributed to the field of near-infrared luminescent materials.

[0005] Technical implementation elements:

[0006] To address development needs, this invention provides a novel organic-inorganic hybrid perovskite (C8H) 22The material N2Cl)2MoCl5CH3 and its preparation method are characterized by the following steps: synthesis of (C8H)2MoCl5CH3 by acid precipitation. 22 N2Cl)2MoCl5CH3 powder, the first step is to add 1 mmol of C8H while stirring continuously. 20 N2 and 1 mmol MoCl5 were dissolved in 2.5 mL of HCl (36-38%) (denoted as solution A) in a 10 mL sample vial and stirred continuously with a magnetic stirrer at 80 °C until completely dissolved. After clarification, the solution was slowly cooled to crystallize, washed with isopropanol, filtered, and finally dried overnight at 70 °C to obtain the final (C8H) solution. 22 N2Cl)2MoCl5CH3 powder.

[0007] In summary, compared with the prior art, the above-described technical solutions conceived by this invention can achieve the following beneficial effects:

[0008] Material composition and properties: Most existing perovskite near-infrared luminescent materials are lead-based perovskites or metal-doped materials, which cause significant environmental pollution, have unstable luminescence, and cannot be arbitrarily tuned in terms of emission wavelength. The band gap of organic-inorganic hybrid perovskites can be adjusted over a wider range by changing the type and ratio of organic cations, metal cations, or halide anions, allowing for more precise matching of different wavelength requirements in the near-infrared spectral region. In contrast, the band gap adjustment of inorganic perovskites is relatively limited.

[0009] 2) Structure: (C8H) 22 The perovskite material N2Cl)2MoCl5CH3 has a Pna21 space group structure.

[0010] 3) Process: Based on improved acid precipitation technology. This invention uses HCl solvent as the precursor solvent to precipitate (C8H) in one step. 22 N2Cl)2MoCl5CH3 organic-inorganic hybrid perovskite luminescent material. Attached Figure Description

[0011] Figure 1 The fluorescence emission spectrum of perovskite materials prepared according to existing technology;

[0012] Figure 2 The XRD pattern of the synthesized material achieved according to the present invention;

[0013] Figure 3 Scanning electron microscopy (SEM) results;

[0014] Figure 4 The near-infrared spectra of near-infrared PC-LEDs prepared from perovskite luminescent materials synthesized according to the present invention under different driving currents are shown. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0016] In this invention, all the materials selected are elements with high abundance in the Earth's crust, and the lead-free halide perovskite structure and its tunable emission range make it a low-cost and relatively stable near-infrared luminescent material with development potential.

[0017] The principle of the acid precipitation method, which has a relatively simple process and low requirements for experimental environment, is to rapidly add the raw material to a miscible antisolvent, causing the precursor material to precipitate as crystals. Research has found that after the crystal form changes, the luminescence performance is significantly improved, even reaching the highest luminescence efficiency to date in the near-infrared band, and the stability exceeds that of most lead-based perovskite materials.

[0018] Example 1

[0019] An organic-inorganic hybrid perovskite material, the specific preparation steps of which are as follows:

[0020] Step 1: Clean a glass bottle; rinse the white glass bottle with deionized water, acetone, isopropanol and deionized water for ten minutes each, then dry it with a nitrogen gun.

[0021] Step 2: First, while stirring continuously, dissolve 0.50 mmol MoCl5 in 2.5 mL of HCl solution, which is called solution A.

[0022] Step 3: Add 1 mmol of C8H 20 N2 is added to solution A;

[0023] Step 4: Stir the mixture thoroughly at 80℃;

[0024] Step 5: After slow cooling and crystallization, the liquid is removed, the crystals are washed with isopropanol and filtered, and finally dried overnight at 70°C to obtain the final organic-inorganic hybrid perovskite powder. Technical Summary

[0025] This invention discloses an organic-inorganic hybrid perovskite material with high near-infrared luminescence performance and its universal preparation method. The method includes the following steps: using HCl solvent as a solvent, adding organic molecules C8H... 20 N2 and molybdenum chloride were added to the precursor solution and stirred. After clarification, the solution was slowly cooled and crystallized. The solution was washed with isopropanol and filtered to obtain the prepared organic-inorganic hybrid perovskite near-infrared luminescent material.

[0026] The near-infrared luminescent material realized according to the present invention has the characteristics of high performance and high stability.

Claims

1. A high-performance lead-free perovskite near-infrared material, synthesized by acid precipitation followed by centrifugation to obtain the chemical formula (C8H2O2). 22 Perovskite near-infrared luminescent material crystal of N2Cl)2MoCl5CH3.

2. The method for preparing the organic-inorganic hybrid perovskite near-infrared luminescent material as described in claim 1.

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