62results about How to "High fluorescence quantum yield" patented technology

The invention provides a folate receptor targeting small molecule compound, a preparation method, a composition and application. Specifically provided is a compound represented by formula I or a pharmaceutically acceptable salt thereof. The compound or the pharmaceutically acceptable salt thereof provided by the invention can be used as a small-molecule targeting fluorescence contrast agent for assisting surgical treatment, has the advantages of novel structure, good solubility, small steric hindrance and strong targeting property, can obviously improve the view field of tumor surgery, and is beneficial to efficiently and accurately implementing excision of pathological tissues such as tumor tissues, boundary tissues and the like. # imgabs0 #

The invention discloses an OMTD photoelectric mapping transparent display film with adjustable light transmittance and a preparation method, and belongs to the technical field of transparent display films. The transparent display film comprises an electric control dimming film layer, a fluorescent layer, an adhesive layer and a release material layer, wherein the fluorescent layer comprises the following raw materials in parts by weight: 80-100 parts of polyurethane resin, 2-5 parts of a fluorescent agent, 3-6 parts of a dispersing agent, 4-8 parts of a modified anti-aging agent, 1-10 parts of a curing agent and 200 parts of a solvent; according to the invention, p-phenylenediamine and 4-(diethylamino) salicylaldehyde react to prepare a fluorescent small molecule substance, and then the fluorescent small molecule substance is introduced into a polyurethane chain to finally prepare the fluorescent agent. The prepared transparent display film has excellent fluorescence performance, transparency and anti-aging performance.

The invention discloses a preparation method and application of a sensor array based on luminous carbon dots, and relates to the technical field of sensors, the preparation method comprises the following steps: preparing a carbon source which comprises a precursor containing a targeting functional group or a biomolecule derived carbon source, preparing the luminous carbon dots through a chemical synthesis or physical method, modifying the surfaces of the carbon dots, and preparing the sensor array based on the luminous carbon dots. A core-shell structure is added on the surface of a carbon dot by using an in-situ growth method or a layer-by-layer self-assembly method, the carbon dot with the added core-shell structure is fixed on a substrate of a sensor array, and a performance test is carried out. By synthesizing the carbon dots with a targeted recognition function, the selectivity and the sensitivity of the sensor to a target substance can be remarkably improved, and in the synthesis process, the carbon dots can generate specific interaction with the target substance by adjusting factors such as the structure, the shape, the size and the surface chemical property of the carbon dots; therefore, accurate identification of the target substance is realized, and detection of the marker is realized.

The invention belongs to the technical field of preparation of nano fluorescent materials, and particularly relates to a preparation method and application of a polymer-based sulfur quantum dot water treatment agent. The preparation method comprises the following steps: (1) adding sulfur powder and a dispersing agent into an alkaline solution to prepare a mixed solution; (2) putting the mixed solution obtained in the step (1) into a water bath at 70-90 DEG C, heating, stirring and reacting for 15-20 minutes, and then adding an etching solvent; and (3) continuously reacting for 5-6 hours until the reaction is finished, adding the etching solvent again, and keeping the temperature for 0.5-1 hour to obtain a brownish red solution which is the sulfur quantum dot water treatment agent. The preparation method of the polymer-based sulfur quantum dot water treatment agent has the advantages of simple process, short preparation time, mild reaction conditions, low energy consumption, low cost and the like, and the prepared fluorescent sulfur quantum dot water treatment agent is simple in component and good in water solubility, can be used for inhibiting mineral scales and bacteria in industrial water, and has good application prospects. The concentration of the water treatment agent is monitored and controlled on line, and industrial production and market application prospects are achieved.

The invention belongs to the field of polyester materials, and relates to a high-temperature-resistant polyarylester fluorescent film and a preparation method thereof. The preparation method comprises the following steps: carrying out esterification reaction on a reaction monomer under the conditions of a catalyst and a stabilizer, firstly mixing and stirring bisphenol fluorene, 18-crown ether-6 and deionized water to prepare a precursor solution, then gradually dropwise adding part of a paraphthaloyl chloride solution, continuously reacting for 3 hours under an alkaline condition, then adding an aqueous solution of bisphenol A into the solution, continuously reacting for 3 hours under an alkaline condition, and carrying out vacuum drying, so as to obtain the bisphenol fluorene / 18-crown ether-6 composite material. And continuously dropwise adding the residual paraphthaloyl chloride solution, reacting for 5 hours, adjusting the pH value of the mixed solution to be acidic, finally crushing, suction-filtering, precipitating and drying the product, and dissolving the product in an N-methyl pyrrolidone solution to prepare the film. The film prepared by the method has better high-temperature resistance, can emit blue fluorescence under the excitation of ultraviolet light, and can be used as a new optical material to be applied to the anti-counterfeiting field.

The invention relates to an orange red copper-based halide luminescent material and a preparation method thereof, and belongs to the technical field of luminescent materials. The molecular formula of the luminescent material is (TPP) 2Cu4Br6. 2DMSO, and the luminescent material belongs to a Pbcn space group in an orthorhombic system, presents broadband orange-red light emission under ultraviolet excitation, has the characteristics of no toxicity, broadband emission, high fluorescence quantum yield, low cost and the like, and shows a huge application prospect in the field of solid-state illumination. According to the method, a single crystal of the luminescent material is obtained by adopting a low-temperature cooling crystallization method, and a micro crystal of the luminescent material is obtained by adopting an anti-solvent method; the preparation method has the characteristics of simplicity in operation, short reaction time, suitability for batch production and the like, and is beneficial to popularization and application of the luminescent material.

The invention provides a planar chiral [2.2] cyclosimulation organic small molecule with high solid-state luminescence performance, a preparation method and application, and relates to the field of organic luminescent materials. The invention provides a planar chiral [2.2] cyclosimulation organic small molecule with high solid-state luminescence performance. The molecular structural formula of the planar chiral [2.2] cyclosimulation organic small molecule is as follows: # imgabs0 #, according to the planar chiral [2.2] cyclosimulation organic small molecule with the high solid-state luminescence property, an electron donating group diphenyl amino and an electron withdrawing group [(2-dimeryl boryl) phenyl] ethynyl are respectively introduced into pseudo meta-positions of two benzene rings of [2.2] cyclosimulation, so that the planar chiral [2.2] cyclosimulation organic small molecule has high solid-state fluorescence quantum yield and high solid-state luminescence asymmetric factors, and the planar chiral [2.2] cyclosimulation organic small molecule has the advantages of high solid-state fluorescence quantum yield and high solid-state luminescence asymmetric factors. The material shows excellent circular polarization luminescence characteristics.

The invention discloses a colored light conversion material, a colored light conversion adhesive film and a photovoltaic module, and the colored light conversion material comprises a compound with a structure shown in the following formula: # imgabs0 #, r1 to R3 and Ra to Rj are each independently selected from the group consisting of H, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted heteroalkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heteroaryl group, a substituted or unsubstituted amino group, a substituted or unsubstituted amide group, a substituted or unsubstituted cyclic imino group, and a substituted or unsubstituted alkoxy group; r1 represents a hydrogen atom, a substituted or unsubstituted carboxyl group, a substituted or unsubstituted ester group, and a substituted or unsubstituted carbonyl group. According to the colored light conversion material, fluorene which is simple in structure, free of heteroatom rings, free of interaction with metal ions and high in luminous efficiency serves as a structural basis, and the applicability is good; the colored light conversion agent is simple in structure, low in synthesis cost, stable in structure and good in application prospect.

The invention provides a surface-modified perovskite nanocrystal and a preparation method and application thereof, and the surface-modified perovskite nanocrystal comprises: a perovskite nanocrystal having a chemical composition of ABX3; wherein A is selected from at least one of Cs < + >, CH3NH3 < + > and HC (NH2) 2 < + >; b is selected from at least one of Pb < 2 + >, Sn < 2 + >, Ge < 2 + > and Mn < 2 + >; x is selected from halogen anions; the surface of the perovskite nanocrystal is coated with an organic ligand layer; the organic ligand comprises a halogenated organic ligand. In the surface modified perovskite nanocrystal, the surface of the perovskite nanocrystal is coated with the organic ligand layer, so that surface defects can be effectively passivated at the same time, and the surface integrity and the crystallization quality of the nanocrystal are remarkably improved. And due to the surface consistency, the defect state density is reduced, and the exciton and phonon coupling coefficient is reduced, so that a non-radiative composite channel is remarkably inhibited, and the optical performance of the perovskite nanocrystal is remarkably improved.

The invention discloses a preparation method of all-inorganic perovskite nanocrystals based on liquid phase pulse laser induction, belonging to the technical field of perovskite luminescent materials. The preparation method is: using Cs2CO3 and PbBr2 as reaction precursors, adding n-hexane, oleic acid and oleylamine, and performing irradiation reaction under a 1064nm pulse laser beam; the product after the irradiation reaction is centrifuged once to obtain a supernatant, and the supernatant is centrifuged twice to obtain a solid product perovskite nanocrystal. The invention successfully prepares all-inorganic perovskite nanocrystals with high fluorescence quantum yield under the condition of no inert gas protection by using liquid phase pulse laser radiation technology.

The invention relates to the technical field of solid luminescent materials, in particular to a CsPbBr3 perovskite quantum dot germanium borate glass material and a preparation method and application thereof. The CsPbBr3 perovskite quantum dot germanium borate glass material provided by the invention is prepared from the following chemical components in parts by mass: 25 to 29 parts of GeO2, 100 to 108 parts of H3BO3, 2 to 6 parts of ZnO, 1 to 4 parts of SrCO3, 3 to 8 parts of Cs2CO3, 2 to 7 parts of PbO and 1 to 8 parts of NaBr. The perovskite quantum dots are embedded into the germanium borate glass, so that the environmental stability of the perovskite quantum dots is improved, and the application prospect of the perovskite quantum dots in photoelectric devices is expanded. Furthermore, LiF is introduced into the perovskite quantum dot germanium borate glass material, so that not only is the fluorescence quantum yield of the perovskite quantum dot glass improved, but also the environmental stability of the perovskite quantum dots can be further improved.

The invention discloses a preparation method of a carbon dot nano-enzyme based on response surface methodology optimization, the carbon dot nano-enzyme and application of the carbon dot nano-enzyme, and belongs to the technical field of carbon dot nano-enzyme preparation. The preparation method provided by the invention comprises the following steps: stirring and dissolving glucose, ferrous sulfate and concentrated sulfuric acid in water, then carrying out hydrothermal reaction, and after the reaction is finished, purifying to obtain carbon dot nano-enzyme; determining the fluorescence intensity of the carbon dot nano-enzyme; selecting the molar ratio of glucose to ferrous sulfate, the addition amount of concentrated sulfuric acid and the reaction time as influence factors, and taking the fluorescence intensity of the carbon dot nano-enzyme as an inspection value, and performing response surface method optimization to obtain a regression equation; and finally, optimal reaction conditions are obtained through software optimization. The synthesis efficiency is high, and the optimally synthesized carbon dot nano-enzyme has high fluorescence quantum yield and excellent peroxidase-like activity, can be applied to tetracycline detection as a colorimetric probe, and is high in detection sensitivity and accuracy.

The present invention discloses a two-dimensional tin-based perovskite material and a preparation method and application thereof. The preparation method of the two-dimensional tin-based perovskite material of the present invention comprises the following steps: (1) subjecting a mixed slurry of tin halide and alkylene diamine to a first grinding to obtain a mixture A; (2) subjecting a mixed slurry comprising mixture A, a hydrohalic acid and an alcohol to a second grinding to obtain a mixture B; (3) volatilizing the solvent in the mixture B to obtain; wherein the molar ratio of the tin halide to the alkylene diamine is 1:(0.5-4); the carbon chain length of the alkylene diamine is C6-C10. The preparation method of the two-dimensional tin-based perovskite material of the present invention is a mechanochemical synthesis method with simple steps, mild conditions, environmental friendliness, convenient operation, and suitable for large-scale synthesis. The preparation method of the two-dimensional tin-based perovskite material of the present invention can be used to prepare different types of two-dimensional tin-based perovskite materials, thereby expanding the types of two-dimensional tin-based perovskite materials.

The present invention relates to an organic boron compound and its application in an organic electroluminescent device, belonging to the technical field of optoelectronic materials. The compound is composed of a main body formed by bonding imidazopyridine with nitrogen groups such as aromatic amine, carbazole, and acridine, and the main center is modified by boron, and has a rigid large conjugated structure. Due to the bipolar imidazopyridine group regulating the electrical supply / acceptance of the compound, the HOMO of the compound is reduced. The device prepared by using the compound as a light-emitting layer material exhibits stable and efficient deep blue light emission, and has achieved significant progress in driving voltage, current efficiency, light color and life.

The invention provides a preparation method of a high-activity carbon quantum dot, the high-activity carbon quantum dot and application, and relates to the technical field of carbon quantum dots, the preparation method comprises the following steps: S1, dissolving glucose, polyethylene glycol and Eu < 3 + > ions in deionized water to form a mixed solution; s2, under the stirring condition, adding a sodium hydroxide solution into the mixed solution, and adjusting the pH value to obtain a mixed solution; s3, starting the microwave reaction device, and setting power and time; a surface modifier polyethylene glycol is introduced to accurately control the surface chemical properties of the carbon quantum dots, the dispersibility and stability of the carbon quantum dots are improved, a fluorescence enhancer Eu < 3 + > ions are introduced to improve the fluorescence quantum yield and fluorescence stability of the carbon quantum dots, glucose is synchronously used as a carbon source, a sodium hydroxide solution is added to adjust the PH, and the fluorescence intensity of the carbon quantum dots is improved. The preparation method is optimized and synthesized with the regulator, so that the yield and the reaction efficiency are improved, and accurate regulation and control on the particle size and the morphology of the carbon quantum dots are realized.

The present invention provides a targeted near-infrared fluorescent compound and a preparation method and application thereof, and relates to the technical field of organic fluorescent molecules. The targeted near-infrared fluorescent compound has a structure as shown in the following formula I. The present invention uses an organic total synthesis method to modify the S0456 near-infrared small molecule on the CXCR4 inhibitor to obtain a targeted near-infrared fluorescent compound as shown in formula I. The targeted near-infrared fluorescent compound has a good active targeting effect when identifying CXCR4-overexpressing tumors such as triple-negative breast cancer and head and neck squamous cell carcinoma; and the targeted near-infrared fluorescent compound retains the water solubility of the dye and the specificity for tumor cells, and has the advantages of good water solubility and high fluorescence quantum yield. #imgabs0#

The invention discloses an antibacterial packaging material as well as a preparation method and application thereof. The antibacterial packaging material is prepared from pineapple leaf fiber carboxymethyl cellulose, carboxymethyl cellulose, cationic starch, 3-hydroxyl octoate, alpha-tocopherol, dimethylbiguanide hydrochloride, a plasticizer, nitrogen-doped carbon quantum dots, plant essential oil, nano zeolite powder, carvacrol and citric acid. The preparation method comprises the following steps: dispersing the cationic starch in the deionized water, dispersing the pineapple leaf fiber carboxymethyl cellulose and carboxymethyl cellulose in the deionized water, completely dissolving, adding into a starch solution, sequentially adding the rest components, uniformly mixing, heating, reacting, forming a film, and drying to obtain the packaging material. According to the antibacterial packaging material, the cationic starch, the carbon quantum dots, the plant essential oil and other related components are combined for the first time to form a novel antibacterial packaging material, the antibacterial performance is remarkably improved and kept for a long time through the synergistic effect of all the components, and the antibacterial packaging material is high in material stability, simple and convenient in preparation process, low in cost and high in application and popularization value.

The invention relates to a glutathione probe, a preparation method and application thereof, and a bifunctional glutathione probe, which consumes bimolecular glutathione through a sequential activation strategy, so that high fluorescence enhancement is realized, and the accuracy of glutathione response imaging is realized. The Cy-ResNPs shows selective accumulation in mitochondria, the level of reactive oxygen species (ROS) is effectively improved by consuming glutathione, including induction of superoxide anions, and efficient photodynamic therapy is achieved. Intracellular oxidative stress storms induced by a variety of pathways promote iron apoptosis, cell apoptosis, and lethal toxicity in cancer cells. Finally, the Cy-ResNPs realizes accurate diagnosis and effective treatment in transplantable and rapid proliferative melanoma tumors. The research has important significance for tumor therapeutic research by consuming the intelligent small molecular fluorescent agent of glutathione in the future.

This invention relates to an intrinsically fluorescent polyester elastomer and its preparation method. The elastomer is copolymerized from vanillin-based aldehyde monomers with small-molecule cyano monomers and cyano-terminated polyethers or polyester diols via a Knoevenagel polycondensation reaction. By adjusting the molar fraction of the soft segment, a continuous transition from rigid fluorescent plastics to highly elastic fluorescent polyester elastomers can be achieved. The resulting material exhibits both high fluorescence quantum yield and high elongation at break, and can be applied in fields such as melt spinning, fluorescent anti-counterfeiting, and flexible optoelectronic devices.

The invention discloses a heteroatom condensed ring aryl imide derivative and a preparation method and application thereof, and the heteroatom condensed ring aryl imide derivative is prepared by using mono-boric acid ester group substituted or diboric acid ester group substituted-1, 4: 5, 8-naphthalimide, mono-boric acid group substituted or diboric acid group substituted-1, 4: 5, 8-naphthalimide, mono-tin group substituted or ditin group substituted-1, 4: 5, 8-naphthalimide or mono-tin group substituted or ditin group substituted-1, 4: 5, 8-naphthalimide. The heteroatom-condensed condensed ring aryl imide derivative is prepared by taking 1, 8-naphthalimide and heteroatom-condensed dibromo-substituted biphenyl as raw materials through a one-step method, has relatively strong absorption on visible light with the wavelength of about 400-700nm, has relatively high fluorescence quantum yield and good chemical stability, and can be applied to the field of fluorescence imaging. The compound can be used as an organic semiconductor n-type electron transport material to be applied to an organic field effect transistor, an organic electroluminescent device, an organic thermochromic element, an organic solar cell and the like, and can also be used as an intermediate to prepare a novel fused ring aromatic imide electron acceptor material.

The present invention belongs to the technical field of molecular sieves and open frameworks, and specifically relates to a two-dimensional aluminum phosphate material ZHKU-2 prepared based on a novel carbazole derivative template, wherein the asymmetric unit molecular formula is [C 17 H 21 N 2 ] 3 [Al 3 (PO 4 ) 4 ](H 2 O) 5 , its crystal form is monoclinic P 2 1 / c space group; [C 17 H 21 N 2 ] + It is 2-(9H-carbazole-9-yl)-N,N,N-trimethylethyl-1-ammonium ion. The material has excellent fluorescence performance and extremely obvious color change, and has good application prospects in the fields of optical switches, optical storage, and anti-counterfeiting labels. The present invention also provides a preparation method with low cost and simple process.

The invention discloses a PET (Polyethylene Terephthalate)-based carbon dot which is prepared by taking PET waste as a precursor and adopting a one-step pyrolysis method, and the PET-based carbon dot has remarkably improved fluorescence quantum yield and has a good flame-retardant modification effect on polymers such as PET / PA6 (Polyethylene Terephthalate) / PA6 (Polyamide 6) / PA66 (Polyamide 66) and the like.

According to the aryl boron nitrogen narrow-emission fluorescent material and the preparation method and application thereof, groups with different electron donating capacities are introduced to the periphery of aryl boron nitrogen, an organic light-emitting material with the space charge transfer characteristic is formed, the structure of a device is simplified, and the performance and the service life of the device are improved. The narrow-emission fluorescent material has unique narrow-band emission, high luminous intensity and delayed fluorescence, good thermal stability and good solubility, and has remarkable economic value in the application aspects of preparation of luminescent materials, luminescent devices or intelligent materials and the like.

The application discloses carbon nanodot composite amino acid reagents, a preparation method and application thereof, and belongs to the field of biological materials. The carbon nanodot composite amino acid reagent comprises carbon nanodots and amino acids which are compounded with each other, and the carbon nanodots have electron-withdrawing groups on the surface. The carbon nanodots with electron-withdrawing groups on the surface and the amino acids are compounded, and the two are combined together through hydrogen bonds to form carbon nanodot amino acid reagents. The carbon nanodot amino acid reagents have the properties of amino acids and carbon dots without a complicated purification procedure, are easy to combine with cell membranes to pass through the cells, are beneficial to cell uptake, have high fluorescence quantum yields in aqueous solutions after compounding, and can be applied in biological imaging. In addition, the carbon nanodot amino acid reagents can effectively reduce the number of cells and fat in the body, so that the effect of weight loss is achieved.

The present invention relates to a resonance type organic compound and application thereof, belonging to the field of semiconductor technology. The present invention provides a compound having a structure represented by general formula (1) and general formula (2). The compound of the present invention has a narrow half-peak width, a high fluorescence quantum yield, a high glass transition temperature and molecular thermal stability, and suitable HOMO and LUMO energy levels. When the compound is used as a doping material in a light-emitting layer material of an OLED light-emitting device, the current efficiency of the device is significantly improved, and the purity of the light-emitting color and the life of the device are also greatly improved.

The present invention belongs to the technical field of luminescent materials, and specifically relates to a variable excitation lead-free bimetallic halide single crystal luminescent material and a preparation method and application thereof. The chemical formula of the single crystal luminescent material is A4BB'X9, including [B'X5] 2‑ and [BX4] 2‑ Two luminous centers, [BX4] 2‑ is a tetrahedral configuration, [B'X5] 2‑ It is a pentahedral configuration; wherein A is an organic cation group; B is a divalent metal, B' is a trivalent metal; and X is one or more halogen anions. The variable excitation lead-free bimetallic halide single crystal luminescent material provided by the present invention has variable multiple excitation, excellent luminescent performance, high fluorescence quantum yield, and high stability, and has great promotion value in the fields of scintillation imaging and white light LED for lighting.

On the basis of a classical multi-resonance conjugated skeleton, through fusion with a spirofluorene bridge skeleton and introduction of a large-steric-hindrance protecting group, the Pi-Pi accumulation interaction between planar boron / nitride-containing molecules is effectively inhibited, and the aryl boron-nitrogen compound with narrow-band green light emission is obtained. The compound not only has a narrow emission band, high color purity, high fluorescence quantum yield and high luminous efficiency, but also can tolerate high-concentration doping, and has an anti-aggregation quenching effect. The design strategy of a multi-resonance material system is greatly expanded, a new choice is provided for preparing devices with high-concentration doping and high luminous efficiency, and the method is used for preparing luminescent materials and photoelectric luminescent devices.

The present invention provides a quantum dot composite microsphere and method prepared by atomic layer deposition and atomic layer etching, including using atomic layer deposition to coat a semiconductor film on the outside of a core material to a thickness of more than 21nm, and using atomic layer etching to etch the semiconductor film to a thickness of no more than 5nm, wherein the core material is a non-semiconductor metal oxide or silicon dioxide. The present invention uses atomic layer deposition (ALD) combined with atomic layer etching (ALE) technology to achieve angstrom-level precision control of the size of quantum dots, effectively solving the problem that this precision cannot be achieved in the prior art, thereby improving the performance and application range of quantum dots; at the same time, it avoids the easy agglomeration of quantum dots during the preparation process, improves the efficiency of quantum dots, and forms a uniform, dense, and thickness-controllable quantum dot film; different types of quantum dot films can be deposited, with a wide range of applicability, meeting the market demand for diversified quantum dots.

This invention discloses a novel fluorescent probe for the detection of hydrazine hydrate, its preparation method, and its application, belonging to the field of fluorescent probe technology. The novel fluorescent probe provided by this invention uses a hemicyanine dye derivative as the fluorophore; simultaneously, the thiophene ester in the novel fluorescent probe serves as a specific recognition group for N2H4. On the one hand, its electron-withdrawing effect can efficiently quench the fluorescence of the hemicyanine dye derivative, making the probe "fluorescently silent" when not in contact with the target analyte; on the other hand, its unique structure endows the probe with excellent selectivity and sensitivity, ensuring specific recognition of N2H4. Furthermore, this novel fluorescent probe exhibits advantages such as high accuracy, high sensitivity, immunity to interference from various amino acids, common cations and anions, and good specificity when used for the quantitative detection of N2H4. It also has good pH adaptability and water solubility, thus showing promising application prospects in the detection of hydrazine hydrate.

This invention provides a compound containing a phosphate ester group, its preparation method, and its application in perovskite light-emitting devices. The compound structure is shown in formula (I). This invention utilizes the strong electron affinity of the phosphate ester group to regulate charge carriers in the device, increasing the local carrier concentration on the perovskite film surface and promoting carrier radiative recombination. The phosphoxy groups in the compound have physical and / or chemical interactions with the perovskite components, influencing the kinetic behavior of different components during crystallization, regulating phase composition, passivating unsaturated lead defects in the perovskite lattice, reducing non-radiative energy loss, and improving the fluorescence quantum yield of the perovskite film. By introducing different substituents, the defect passivation effect can be adjusted. Devices obtained using the compound of this invention as an additive achieve high external quantum efficiency without significantly affecting the structure and luminescent properties of the perovskite itself.