1111 results about "Quantum yield" patented technology

A water soluble semiconductor nanocrystal capable of light emission is provided, including a quantum dot having a selected band gap energy, a layer overcoating the quantum dot, the overcoating layer comprised of a material having a band gap energy greater than that of the quantum dot, and an organic outer layer, the organic layer comprising a compound having a least one linking group for attachment of the compound to the overcoating layer and at least one hydrophilic group space apart from the linking group by a hydrophobic region sufficient to prevent electron charge transfer across the hydrophobic region. The particle size of the nanocrystal core is in the range of about 12.ANG. to about 150.ANG., with a deviation of less than 10% in the core. The coated nanocrystal exhibits photoluminescende having quantum yield of greater than 10% in water.

The present invention provides a fluorescent silica-based nanoparticle that allows for precise detection, characterization, monitoring and treatment of a disease such as cancer The nanoparticle has a fluorescent compound positioned within the nanoparticle, and has greater brightness and fluorescent quantum yield than the free fluorescent compound To facilitate efficient urinary excretion of the nanoparticle, it may be coated with an organic polymer, such as polyethylene glycol) (PEG) The small size of the nanoparticle, the silica base and the organic polymer coating minimizes the toxicity of the nanoparticle when administered in vivo The nanoparticle may further be conjugated to a ligand capable of binding to a cellular component associated with the specific cell type, such as a tumor marker A therapeutic agent may be attached to the nanoparticle Radionuclides/radiometals or paramagnetic ions may be conjugated to the nanoparticle to permit the nanoparticle to be detectable by various imaging techniques.

The invention belongs to the technical field of preparation of a carbon nano material, and particularly relates to a method for preparing a carbon dot having a high fluorescent quantum yield from citric acid and different nitrogen-containing molecules. The method comprises the following steps: weighing 1-10 mmol of solid citric acid, and dissolving in 10 ml of deionized water; weighing 1-10 mmol of ethylenediamine, ethylamine, propylamine, butanediamine, n-hexylamine, p-phenylene diamine or urea, adding into the citric acid solution, and uniformly stirring; transferring the solution into a hydrothermal or high-pressure microwave reaction kettle, reacting under hydrothermal or microwave conditions, and naturally cooling the reaction kettle to room temperature, thus obtaining a yellow or brown carbon dot water solution; and finally, purifying the carbon dot water solution, evaporating, and drying to obtain pure carbon dot solid powder. The carbon dot solution can send out bright blue fluorescence under the irradiation of a handheld ultraviolet lamp. The invention has wide application prospects in the fields of biological imaging, fluorescent printing and the like.

Fluorescent dyes are disclosed which are useful as reporter groups for labeling biomolecules. The silicon phthalocyanine dyes disclosed are preferably water soluble, isomericly pure, possess high quantum yield, and are useful in bioassays.

The present invention provides a fluorescent silica-based nanoparticle that allows for precise detection, characterization, monitoring and treatment of a disease such as cancer. The nanoparticle has a range of diameters including between about 0.1 nm and about 100 nm, between about 0.5 nm and about 50 nm, between about 1 nm and about 25 nm, between about 1 nm and about 15 nm, or between about 1 nm and about 8 nm. The nanoparticle has a fluorescent compound positioned within the nanoparticle, and has greater brightness and fluorescent quantum yield than the free fluorescent compound. The nanoparticle also exhibits high biostability and biocompatibility. To facilitate efficient urinary excretion of the nanoparticle, it may be coated with an organic polymer, such as poly(ethylene glycol) (PEG). The small size of the nanoparticle, the silica base and the organic polymer coating minimizes the toxicity of the nanoparticle when administered in vivo. In order to target a specific cell type, the nanoparticle may further be conjugated to a ligand, which is capable of binding to a cellular component associated with the specific cell type, such as a tumor marker. In one embodiment, a therapeutic agent may be attached to the nanoparticle. To permit the nanoparticle to be detectable by not only optical fluorescence imaging, but also other imaging techniques, such as positron emission tomography (PET), single photon emission computed tomography (SPECT), computerized tomography (CT), bioluminescence imaging, and magnetic resonance imaging (MRI), radionuclides/radiometals or paramagnetic ions may be conjugated to the nanoparticle.

The present invention provides a process for preparing carbon quantum dots having uniform size by using emulsion, and a process for doping the inside of the carbon structure with other element or replacing the surface with a surface stabilizer having a specific chemical functional group different from existing stabilizers in order to control the properties of the carbon quantum dots. The process for preparing the carbon quantum dots according to the present invention makes a mass production possible and the process thereof is simple. Furthermore, the process is easy to control the size of the quantum dots and the reaction yield rate of the method is excellent. In addition, according to the present invention, it is possible to synthesize carbon quantum dots having uniform size and superior quantum yield rate and it makes it possible to embody the color as equivalent to existing molecular chromophores or heavy metal quantum dots by changing the structure of the chromophore.

The invention relates to fluorescent dyes (fluorophores) based on polymethines for use in optical measurement and detection procedures, in particular those employing fluorescence, for example in medicine, in pharmacology and in the biological, materials and environmental sciences. The objective was to create fluorophores based on polymethines that have a large Stokes shift, high photostability, long storage life and a high fluorescent quantum yield, and that can be excited in the simplest possible manner by white-light sources or laser radiation in the UV, visible or NIR spectral region. According to the invention dyes on the basis of polymethines having the general formulas I, II or III are employed.

The invention discloses a liquid crystal display screen, a display device and a quantum dot layer graphical method. A plurality of pixel units are arranged in a liquid crystal panel; each pixel unit comprises a plurality of subpixel units capable of displaying different colors; and a monochromatic quantum dot layer is arranged at the position corresponding to at least one color of subpixel unit of each pixel unit. The embodiment of the invention substitutes the quantum dot layer for the conventional resin to serve as a color filter for converting background light into monochromatic light, the emission spectrum of the quantum dots is narrow and the luminous efficiency is high, and the background light can be efficiently converted into monochromic light, so the color gamut of the liquid crystal display screen can be improved, the color saturation is enhanced and the display quality of the display screen is improved. The monochromic quantum dots are dispersed by a high-molecular polymer network, so accumulation of the quantum dots can be avoided, the quantum yield is increased, the quantum excited lighting effect can be improved, contact of the monochromic quantum dots and oxygen can be avoided, and the service life of the quantum dots is prolonged.

The present invention discloses the preparation process of CdSe/CdS, CdSe/ZnS and other II-VI type core-shell quantum dot. The CdSe/CdS and CdSe/ZnS core-shell quantum dot are prepared with cadmium acetate, zinc acetate or other inorganic compound, instead of Cd(CH3)2, Zn(CH3)2 or other inflammable, detonable and expensive organic metal compound, as material. The prdouct has excellent single dispersivity, improved fluorescent property, high quantum yield, high stability, and may be used widely as the fluorescent mark for biological detection and analysis.

In a GaN-based light-emitting diode structure, a transparent conductive oxide layer is formed as a window layer on a GaN contact layer having a surface textured layer, and the textured layer acts as an ohmic contact layer with the transparent conductive oxide layer. Therefore, it is possible to reduce effectively the contact resistance and the working voltage, while the optical guiding effect is interrupted by the textured layer, to obtain thereby an enhancement of light extraction efficiency and thus an increase in the external quantum yield.

The invention discloses an iridium complex phosphor material taking a phthalazine derivative as a ligand. The structure of the material is shown as formulas (I) and (II), wherein Ar represents aryl, substituted aryl, heterocycle aryl and substituted heterocycle aryl; R can be one of a halogen atom, alkyl, substituted alkyl, alkoxyl, aryloxy, an alkylthio group, arylthio, aromatic amino, aliphatic amino or a heterocyclic substituent; L^Y can be one of N-COOH, 8-hydroxyquinoline, beta-diketone, N^NH and the like; N^N can be bipyridyl, diquinoline, 1,10-phenanthroline, a derivative of the 1,10-phenanthroline and the like; and Z can be hexafluorophosphate and perchlorate. A dicyclic or ionic iridium complex phosphorescent electroluminescent device taking the phthalazine derivative as the ligand obtained with the preparation method has high internal and external quantum yields, high luminance and high stability. A dicyclic iridium complex is shown as a formula (I), i.e., (C^N)2Ir(L^Y); and an ionic iridium complex is shown as a formula (II), i.e., (C^N)2Ir(N^N)<+>Z<->.

The invention discloses a preparation method and application of a polyaniline/titanium dioxide/graphene conductive composite membrane. The preparation method comprises the steps of: adding 3-60wt% of titanium dioxide, 0.05-5wt% of graphene and 0.6-10wt% of polyaniline into protonic acid solution, and adopting an in-situ polymerization method to obtain a polyaniline/titanium dioxide/graphene conductive composite; sequentially and evenly coating conductive resin and polyaniline/titanium dioxide/graphene coatings to matrixes such as polypropylene, glass slides, metal plates and the like, wherein each coating is 30-500mu m thick; and drying at 60-80 DEG C to obtain the needed product. According to the preparation method, the titanium dioxide is embedded in a conductive material to prepare the membrane, the defects that the nano TiO2 is not easy to recover and the quantum yield is low can be overcome, the separation efficiency of photoproduction electrons and cavities can be improved, the photoresponse range can be extended, and the photocatalytic efficiency can be improved.

The invention relates to carbon dots with high fluorescent quantum yield, and an application thereof in fluorescent color development, and belongs to the application field of fluorescent carbon nanomaterials. Specifically, the invention relates to the carbon dots with the high fluorescent quantum yield which are synthesized by using citric acid and ethene diamine as raw materials as a fluorescent ink for writing or fluorescent printing, and further broadens the application thereof in fluorescent electrospining, fluorescent micro arrays and fluorescent composites. The carbon dots with the high fluorescent quantum yield are obtained by blending 1-100 mmol of citric acid and 1-100 mmol of ethene diamine in 5-100 mL of deionized water and transferring the mixture into a reaction kettle; carrying out a hydrothermal reaction for 2-10 hours at a temperature of 100-500 DEG C; cooling the reaction kettle to a room temperature after the reaction is finished to obtain a water solution of the carbon dots with the high fluorescent quantum yield; pouring the water solution of the carbon dots in a dialysis bag with a molecular weight of 3,500; dialyzing for 48-60 h; spin drying a dialysis outer solution and vacuum drying.

The invention discloses a microwave-assisted method for preparing carbon quantum dots rich in amino groups on the surfaces thereof and application of the amino carbon quantum dots. The method comprises the following steps: using aqueous solution of glucosamine phosphate as a raw material, heating the raw material with a microwave oven as a reaction platform to obtain carbon quantum dots with fluorescent properties, and removing residues and moisture by dialysis and rotary evaporation to obtain carbon quantum dot powder. The method provided by the invention for preparing amino carbon quantum dots is simple in operation and easy in generalization, has low cost, high yield, simple preparation process and equipment, and can complete the operation in a very short time. The obtained carbon quantum dots are rich in amino groups on the surfaces thereof and soluble in water, the fluorescence quantum yield is greatly increased, and the carbon quantum dots are successfully used for labeling living cells, therefore the method has broad application prospects.

The invention relates to a method for preparing a graphene quantum dot. The method is mainly characterized in that the method comprises the following steps: adding an amine passivation agent in a suspension of graphene oxide dispersed in water; and then carrying out hydrothermal passivation treatment to obtain the graphene quantum dot with higher quantum yield. The method is very simple and convenient in operation and environment-friendly; the obtained quantum dot has high quantum yield; and the properties are easily regulated and controlled by changing the kinds of the passivation agents; and the method has large-scale preparation potential and wide application prospect.

The invention relates to neutral mononuclear copper (I) complexes for emitting light and with a structure according to formula (A) in which: M represents: Cu(I); L∩L represents: a single, negatively charged, bidentate ligand; N∩N represents: a diimine ligand (substituted with R and FG), in particular a substituted 2,2′-bipyridine derivative (bpy) or a substituted 1,10-phenanthroline derivative (phen); R represents: at least one sterically demanding substituent for preventing the planarisation of the complex in the excited state; FG=functional group, and represents: at least one second substituent for increasing solubility in organic solvents. The substituent can also be used for electron transport or alternatively for hole transport, said functional group being bound to the diimine ligands either directly or by means of suitable bridges; and the copper (I) complex: having a ΔE(S₁−T₁) value of less than 2500 cm⁻¹ between the lowest excited singlet state (S₁) and the triplet state (T₁) which lies below; having an emission lifespan of at most 20 μs; having an emission quantum yield of greater than 40%, and a solubility of at least 1 g/L in organic solvents, in particular polar organic hydrocarbons such as acetone, methyl ethyl ketone, benzene, toluene, chlorobenzene, dichlorobenzene, dichloromethane, chloroform, dichloroethane, tetrachloroethylene, alcohols, acetonitrile or water.

The invention belongs to the field of application of near-infrared laser, nuclear irradiation, electron and image rebuild in systematic biology and medicine. It is characterized in that high-specificity nuclear species and fluorescent probe are implanted in live animal to realize double mark of muscle deep layer or internal organ tumor cell. The emission signal of nuclear species is checked by sensitive electron-multiplier phototube in array copulation position of scintillation crystal; feeble fluorescent signal generated by visible light or infrared agitation is checked by high quantum yield CCD camera. The two checking systems are orthogonally arranged in the same surface, the live nuclear species and fluorescent signal can be checked simultaneously through rotary image cavity, and double module three dimensional tomography image of small animal can be rebuilt with software algorism. The invention is characterized by multi-image forming modules, abundant information and simple operation.

The invention provides an InP quantum dot and a preparation method therefor. The InP quantum dot comprises an InP core modified with a metal salt and a shell wrapping the core, wherein the shell is ZnSe/ZnS or ZnSexS(1-x), x is greater than 0 and is not greater than 1, the half-peak breadth of the InP quantum dot is less than or equal to 50nm, and the quantum efficiency is more than or equal to 70%. Due to the modification of the metal salt, dangling bonds on the surface of InP are eliminated, the loss of energy in form of non-optical properties can be reduced, and the fluorescent quantum yield of quantum dots with metal salt modified InP is increased; in addition, the difference of lattice constants of InP and ZnSe is relatively small, so that the shell with S and Se can relatively easily coat the surface of the InP core, and then, the InP quantum dot provided by the invention has relatively high quantum efficiency and stability; and meanwhile, the half-peak breadth of the InP quantum dot is less than or equal to 50nm, so that the particle size of the quantum dots is relatively uniform.

The invention discloses application of fluorescent silica nanoparticles as an anti-fake mark. The fluorescent silica nanoparticles are prepared from a silicon source, and the obtained fluorescent silica nanoparticles are used for preparing anti-fake patterns by using anti-fake ink. The fluorescent silica nanoparticles are excellent in luminescent property, high in quantum yield and good in storage stability, and have good excitation wavelength dependency; the prepared anti-fake patterns can display light of different colors under the illumination of different laser wavelengths, and can achieve a good anti-fake effect.

The invention relates to a method for preparing luminescent carbon dots from carbohydrate. The carbohydrate based carbon dots prepared by the invention can be used for biological imaging and analysis to determine the content of metal ions. The method for preparing luminescent carbon dots from carbohydrate provided by the invention is as below: mixing carbohydrates with a modifier with amino at different molar ratios; reacting for a certain time by a hydrothermal method; filtering; regulating the pH to a neutral state, conducting dialysis and purification to remove excessive salt, so as to obtain the carbohydrate based luminescent carbon dots. The method for preparing the luminescent carbon dots provided by the invention uses carbohydrates as raw materials, which are easily available and have low cost; the obtained carbon dots have high quantum yield; and the equipment for the preparation process is simple,the method can be completed in general chemistry laboratory, and is easy for popularization.

The invention relates to a multiple-test tube stirring-rotating type method and device for photochemical reaction. The inner parts of test tubes for photochemical reaction are simultaneously stirred by magneton, the test tubes rotate around a light source and are illuminated in rotating states, the center light source surrounded by the test tubes is filtered by chemical light-filtering liquid or light-filtering sheets, the chemical light-filtering liquid is put into an outer interlayer with a double-interlayer quartz cold trap, the cooling water passes through an inner interlayer, and the light source is placed in the inner cavity of the quartz cold trap. At most 10-20 test tubes of 10-50ml can be simultaneously inserted into the device of the invention to be illuminated; the liquid for photochemical reaction in the test tubes is ventilated to participate in the reaction or is ventilated for protecting; and the invention can ensure the uniformity of the concentration of the reaction solution and the uniformity of the received illumination, can ensure the reliability and the high efficiency of the experimental result, and is especially suitable for measuring kinetic constants such as the quantum yield, the reaction rate and the like of the photochemical reaction.

The invention relates to a preparation method for a zinc ion-doped yellow fluorescent carbon quantum dot. The preparation method comprises the following specific steps: placing a zinc source, a carbon source, a passivator and an organic solvent in a hydrothermal kettle, placing the hydrothermal kettle into a drying oven and heating for reaction; stopping heating after completion of reaction, cooling and taking out a solution in the hydrothermal kettle; centrifuging, taking supernatant, and carrying out rotary evaporation or drying so as to obtain solid powder, and after the solid powder is dissolved in water in an ultrasonic manner, dialyzing through a dialysis membrane so as to obtain a quantum dot aqueous solution. The characteristics that the reaction conditions are mild and the method is simple and easy to implement are realized. The prepared yellow fluorescent carbon quantum dot with high strength can stably emit yellow fluorescence and the quantum yield is high.

A series of organometallic complexes and the singlet oxygen sensitization properties of these complexes are provided. Complexes with acetylacetonate ligands give singlet oxygen quantum yields near unity, whether exciting the ligand-based state or the lowest energy excited state (MLCT+³LC). The singlet oxygen quenching rates for these β-diketonate complexes are small, roughly three orders of magnitude slower than the corresponding phosphorescence quenching rate. Similar complexes were prepared with glycine or pyridine tethered to the Ir(III) center (i.e. (bsn)₂Ir(gly) and (bt)₂Ir(py)Cl, where gly=glycine, and py=pyridine). The glycine and pyridine derivatives give high singlet oxygen yields.

The invention discloses a color film substrate, a liquid crystal display screen and a monochromatic quantum dot dispersion method. A laminated structure containing monochromatic quantum dots is arranged on a sub-pixel region of at least one color of each pixel on the color film substrate, and is formed by alternately laminating flaky graphite layers and monochromatic quantum dot layers; as the laminated structure containing the monochromatic quantum dots is used to replace current color resin and used as a colored filter, bias lighting is converted into monochromatic light; as an emission spectrum of the quantum dots is narrow and high in light efficiency, the bias lighting can be efficiently converted into the monochromatic light, the color gamut of the liquid crystal display screen can be improved, the color saturation can be enhanced, and the displaying quality of the display screen can be improved; moreover, the laminated structure is formed by alternately laminating the flaky graphite layers and the monochromatic quantum dot layers, so that the monochromatic quantum dots can be uniformly dispersed between adjacent flaky graphite layers, the accumulation of the monochromatic quantum dots can be prevented, the quantum productivity of the quantum dots is increased, and the excitation light efficiency of the quantum dots is improved.

The invention discloses an oil-soluble Mn-doped CsPb(Cl/Br)3 dual-emission nanocrystal and a preparation method thereof. The preparation method comprises the following steps: (1) synthesizing an all-inorganic CsPbBr3 perovskite nanocrystal precursor; and (2) carrying out halide-ion-exchange-assisted Mn-to-Pb ion exchange. The preparation method is carried out at room temperature, is simple in process and easy to operate, has the advantages of convenient raw material supply and low raw material price, can be completed in a common chemical laboratory, and thus, is easy to popularize. The Mn-doped CsPb(Cl/Br)3 nanocrystal has two emission peaks (perovskite intrinsic emission and Mn ion emission). The Mn-doped CsPb(Cl/Br)3 dual-emission nanocrystal obtained by the preparation method has high 56% fluorescence quantum yield, and can be used for manufacturing ratiometric temperature probes by utilizing the dual-peak-intensity temperature dependence characteristic.

The invention belongs to strong-fluorescence boron dipyrromethene dyes containing a carbazole structure in the technical field of organic chemical industry and fine chemical industry. Because a method for preparing the strong-fluorescence boron dipyrromethene dye containing the carbazole structure and derivatives thereof adopts boron dipyrromethene and carbazole aldehyde with substituent as raw materials, the molar ratio of the boron dipyrromethene to the carbazole aldehyde is 1:2-5, piperidine is a catalyst, a 4-angstrom molecular sieve is a dehydrating agent, and the molar ratio of the borondipyrromethene to the catalyst is 1:0.01-0.20; in an organic solvent, at the temperature of between 100 and 150 DEG C and under the protection of argon or nitrogen, the mixture reacts for 8 to 50 hours by stirring, the carbazole aldehyde and the active methylene of the boron dipyrromethene are dehydrated to generate the boron dipyrromethene derivatives; and after the carbazole structure with different substituents is introduced into the boron dipyrromethene, the optical property of the boron dipyrromethene compound is changed, the red shift of the absorption spectrum thereof is 80 nanometers, the red shift of the emission spectrum is 90 nanometers, higher fluorescence quantum yield is kept at 0.67, the laser efficiency reaches more than 30 percent, and the strong-fluorescence boron dipyrromethene derivatives containing the carbazole structure are obtained.

The invention discloses a preparation method of fluorescent complex microgel which is sensitive to temperature and pH. The method comprises the technical steps of preparing a mixed surface active agent, preparing the oil phase of a template, preparing an emulsive liquid, preparing a water phase, preparing N-isopropyl acryl amide copolymerized methacrylic acid microgel, preparing turgid N-isopropyl acryl amide copolymerized methacrylic acid microgel, preparing a mixed liquid of Gamma-aminopropyl triethoxy silane and normal heptane, preparing a silicon dioxide polymer complex microballoon decorated by a surface deposited amino group, preparing a mixed liquid of fluorescein isothiocyanate and absolute ethyl alcohol as well as preparing the fluorescent complex microgel. In the invention, the fluorescein isothiocyanate with high quantum yield and good optical stability is adopted as fluorescent matter; the prepared fluorescent complex microgel is sensitive to temperature and pH; and the size of the prepared fluorescent complex microgel is in a micron range and is hard to be aggregated. The method has the advantages of reasonable design, practical technique and easy operation; moreover, reactions are carried out under normal temperature and the like; the method can be applied to the fields of controlled release of medicament, biological probe, chemical separation, and the like.

The invention discloses a simple green synthesis method of nitrogen-doped carbon quantum dots. Konjac flour, serving as a carbon source, is subjected to pyrolysis in air and solvent extraction to obtain the nitrogen-doped carbon quantum dots. The synthesized nitrogen-doped carbon quantum dots are easily dissolved in solvents such as ethanol, N,N-dimethyl formamide and dimethyl sulfoxide and can be ultrasonically dispersed in water, the particle size is 0.3-2.4 nm, the highest fluorescence quantum yield is 22%, and the yield is 3%-5%. The nitrogen-doped carbon quantum dots can emit blue light, green light and red light respectively under the excitation of ultraviolet light, blue light and green light, and the fluorescence property of the nitrogen-doped carbon quantum dots can be adjusted through the excitation light wavelength, concentration and pH value. The method is simple and easy to operate and can be applied to large-scale synthesis of carbon quantum dots while the cost is low. The synthesized nitrogen-doped carbon quantum dots can be applied to the development of living cells in vitro and the preparation of stimulus response materials, and have broad application prospects in multiple fields of biomarkers, biomedical imaging, bio-development, drug screening and detection, biochips, biosensing and the like.

The invention provides a preparation method for a nitrogen-doped carbon quantum dot. The method includes: reacting water soluble amino acid, peptide or protein and a soluble sugar solution at 130-180DEG C in a stainless steel reaction kettle with a polytetrafluoroethylene liner, performing cooling at the end of reaction, then conducting filtration and dialysis, and performing drying to obtain the nitrogen-doped carbon quantum dot. The preparation method provided by the invention is simple, has the characteristics of mild reaction conditions, and strong operability and repeatability, reaction can occur at 130-180DEG C, no more condition restrictions exist, and the employed raw materials are environment-friendly. Specifically, the carbon quantum dot prepared from glucose and glycine has a size of 2-3 nanometers and yield of 76.0%, and the quantum yield is 13.8%. With a fluorescence quenching effect on iron ions, the nitrogen-doped carbon quantum dot can be used for the sensing field.

The invention relates to one-dimensional organic semiconductor spiral nano-wires with ultra-sensitive fluorescence response upon organic amine gases, and a preparation method and an application thereof. According to the invention, perylene imide derivatives comprising perylene and with asymmetric amphiphilic substituents on two ends are adopted as construction units; in a mixed liquid of a good solvent and a poor solvent, through pi-pi interactions between perylenes of a plurality of perylene imide derivatives comprising perylene and with asymmetric amphiphilic substituents on two ends, the one-dimensional organic semiconductor spiral nano-wires are obtained through self-assembly. The one-dimensional organic semiconductor spiral nano-wires have two significant advantages of a nano-grade spiral structure and good fluorescence quantum yield (up to 25%), such that the nano-wires are suitable to be used in fluorescence detection of organic amine in air. When a network-structured porous membrane woven by using the one-dimensional organic semiconductor spiral nano-wires contacts trace amine vapour (with a concentration of ppb-ppm level), the fluorescence is quenched.