287 results about "Red shift" patented technology

A luminous lamp having an ultraviolet filtering and explosion-proof thin film is disclosed. An outside of a lamp is coated by a transparent layer which comprises phosphor powder. Energy generated by the lamp is absorbed by the phosphor powder while the lamp is shining. The phosphor powder would release energy to shot brilliance, so as to provide auxiliary lighting after turning off the lamp. Additionally, the phosphor powder can absorb harmful ultraviolet and other harmful radiations with shorter wavelengths to be one part of the thin film for filtering harmful radiations. The harmful ultraviolet can be transformed by the phosphor powder into visible light to red shift radiations with short wavelengths; hence the harmful radiations with shorter wavelengths can be eliminated. The illumination of visible light can be further increased. The transparent layer can catch broken fragments of the outside of the lamp to decrease accidents when the lamp is broken.

The invention, in some aspects relates to compositions and methods for altering cell activity and function and the use of light-activated ion pumps (LAIPs).

The invention relates to a synthesis method and application of a ratiometric fluorescent molecular probe for simultaneously detecting a fluorine ion and a sulfite radical. The ratiometric fluorescent molecular probe adopts a 2-(2-hydroxyphenyl)benzothiazole derivative as a matrix structure, and detects the fluorine ion and the sulfite radical based on excited-state intramolecular proton transfer (ESIPT) and intramolecular charge transfer (ICT) mechanisms, respectively. The probe has a maximum emission wavelength of 498 nm in an acetonitrile solution with a concentration of 80%, when the fluorine ion is added, the fluorescence spectrum of the probe has a red shift of 136 nm; and when the sulfite radical is added, the fluorescence spectrum of the probe has a blue shift of 127 nm. The differentiated detection of the two ions can be realized by the fact that the fluorescence spectrum of the probe has an obvious red shift or blue shift after the fluorine ion or sulfite radical is added, respectively, showing different fluorescence response signals. The inventive fluorescent probe has the advantages of simple operation, mild reaction conditions, easy purification, high synthesis yield, good selectivity, high sensitivity and stable optical performances. At the same time, the design and synthesis of the fluorescent probe provide an important foundation for development of multi-functional fluorescent probes in the future.

The invention discloses a photocatalyst of loaded nonmetal nitrogen doping one-dimensional TiO2 for exciting visible light and a preparation method thereof. In the method, a metal Ti plate and concentrated alkaline solution is taken as the main raw materials, visible light photocatalyst of the loaded nonmetal nitrogen one-dimensionally doping TiO2 is prepared by acidification, ion exchange and following heat treatment and by hydrothermal technology. The photocatalyst prepared by the invention is characterized in that the doping of nitrogen leads the catalysis to absorb the visible light and the absorption wavelength red shift is 600nm; the catalyst self is a in loaded style, which solves the defect that granulated catalyst is easy to fall off; the catalyst has a one-dimensional structure, large specific surface and abundant active points, which is favorable for strengthening reaction and mass transport process, thus realizing the degradation of typical indoor air contamination, compared with granulated nitrogen doping TiO2, the activity is higher to 1.2-3.0 times.

A method and apparatus detects dew precipitation and determines dew precipitation onset pressure in a sample of formation fluid located downhole in an oilfield reservoir. In a preferred embodiment, the method includes (a) isolating a sample of formation fluid downhole; (b) illuminating the sample downhole with fluorescence excitation light; (c) measuring at least one characteristic of fluorescence short from the sample; (d) reducing pressure on the sample; (e) repeating steps (b) to (d); (f) detecting dew precipitation when a change is detected in a parameter that is a function of the at least one characteristic of fluorescence emission; and (g) setting dew precipitation onset pressure equal to pressure on the sample when the change in the parameter is detected. The parameter preferably is a function of fluorescence intensity and fluorescence red shift, and the change is an increase in fluorescence intensity and detection of fluorescence red shift. Also, the function includes a ratio of a measured intensity at a first wavelength to a reference intensity, and the reference intensity is a function of a measured intensity at a second wavelength.

The invention discloses a luminescent material having aggregation-induced emission, a method of making and an application thereof. The luminescent material herein has properties of aggregation-induced emission / aggregation-enhanced emission with the maximum absorption wavelength red shift to a visible area so that this type of luminescent material has potential applications in the field of biology. The luminescent material allows the formation of transfer of electric charges in a molecule and exhibits strong polar dependent emission in different solvents. The luminescent material does not emit due to strong dipoalr interaction in a molecule, but emits in a weak-polar environment with a cell. The luminescent material can serve as intracellular lipid droplet and intramicroalgae lipid droplet, and has the advantages of high selectivity, high emission stability and high biological compatibility.

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 method for preparing an Ag / TiO2 nano composite material. Firstly liquid phase laser erosion is utilized to produce a TiOX colloid, and a silver nitrate solution is added to carry out hydro-thermal treatment, thus the Ag / TiO2 nano composite material is obtained. The TiOX colloid in the invention has small particles and high reaction activity; the method is characterized in that no organic reagent such as a reducing agent and a stabilizing agent is added; red shift is produced on light absorption of silver modified titanium dioxide, the forbidden bandwidth is reduced, and the utilization factor to sunlight can be effectively improved; and the method provides a new approach and thinking for realizing modification on a semiconductor material by virtue of ultramicro precious metal nano particles, meanwhile, the application range of the liquid phase laser erosion is widened.

There is provided an IR-absorbing naphthalocyanine dye of formula (I):whereinM is Ga(A1);A1 is an axial ligand selected from —OH, halogen, —OR3, —OC(O)R4 or —O(CH2CH2O)eRe wherein e is an integer from 2 to 10 and Re is H, C1-8 alkyl or C(O)C1-8 alkyl;R1 and R2 may be the same or different and are selected from hydrogen or C1-12 alkoxy;R3 is selected from C1-12 alkyl, C5-12 aryl, C5-12 arylalkyl or Si(Rx)(Ry)(Rz);R4 is selected from C1-12 alkyl, C5-12 aryl or C5-12 arylalkyl;Rx, Ry and Rz may be the same or different and are selected from C1-12 alkyl, C5-12 aryl, C5-12 arylalkyl, C1-12 alkoxy, C5-12 aryloxy or C5-12 arylalkoxy; andeach B is independently selected from a base, wherein BH+ has a pKa of between 4 and 9. The dye is suitable for use in IR-absorbing inkjet inks, providing compatibility with known CMYK inks together with an optimally red-shifted λmax.

The invention discloses a method for synthesizing a Eu<3+>-doped BiVO4 visible light photocatalysis material by using a citric acid complexed sol-gel method. The preparation method is simple, and the visible light activity of the obtained photocatalyst is high. According to the invention, Bi(NO3)3.5H2O (97%) and NH4VO3 (98.5%) are adopted as source materials; citric acid (99.5%) is adopted as a chelating agent; Eu(NO3)3 is adopted as a doping source material; the pH value is regulated by using ammonia water, and a deep blue sol is prepared; the sol is dried by baking, and is calcined for 5h under the temperature of 500 DEG C, such that the Eu<3+>-doped bismuth vanadate photocatalysis material is obtained. Compared with non-doped bismuth vanadate, oxygen vacancies and V<4+> with catalytic activities in the Eu<3+>-doped bismuth vanadate crystals are increased. After doping, red shift occurs in the light absorption performance of the sample, the band gap can be narrowed, such that the visible light photocatalytic activity is substantially improved. The method provided by the invention is advantaged in simple process, mild condition, and good repeatability. The method can be widely applied in photocatalytic degradation of organic pollutants, and has a good application prospect in environment treatment.

The invention discloses a multicolor luminous carbon nanodot as well as a preparation method and an application thereof, belonging to the field of nanomaterial science and solving the technical problems that the emitted light peak position of a carbon nanodot generates red shift and the strength is weakened with increase of wavelength of excited light and a preparation method of the carbon nanodot is high in cost, complex to operate, time-consuming and labor-consuming in the prior art. According to the preparation method, with a polycarboxylic or polyhydric organic compound or an amino acid as a carbon source and long-chained organic diamine as a surface passivation modifier, the multicolor luminous carbon nanodot is prepared by the steps of low-temperature pyrolysis, precipitation washing, dialysis separation and freeze drying. The preparation method of the multicolor luminous carbon nanodot is simple, low in cost and can be conveniently put into large-scale production; the prepared carbon nanodot is at a solid state, is convenient to store, has high fluorescence quantum efficiency and good biocompatibility, can respectively emit strong green light, orange light and red light under the excitation of blue light, green light and yellow light, and can be used as a bioluminescence probe and an optical imaging marker.

A camouflage structure, capable of altering its appearance, comprises a camouflage graphic layer and a color-changing layer disposed on the camouflage graphic layer. Originally, the camouflage structure presents a first color state. After the color-changing layer changes the color by driving methods, the camouflage structure presents a second color state. For example, a transparent or semi-transparent color-changing layer able to reflect or emitting red light could be disposed on the woodland camouflage graphic layer, which allows for the overall appearance to change from the greenish woodland camouflage to the brownish desert camouflage. Alternatively, the camouflage structure could comprise a greenish camouflage graphic layer made of material with red-shift characteristics, which means the greenish camouflage graphic layer consists of different colors of chromic materials with reversible red-shift characteristics. The greenish camouflage graphic layer can be red-shifted by driving methods so as to present an appearance of brownish desert camouflage.

The present invention relates to one kind of composite nanometer material in a core-shell structure including a dielectric core of nanometer SiO2 microsphere and a metal shell of Cu. The process of preparing the composite nanometer material includes: preparing colloidal SiO2 particle, self-assembling nanometer SiO2 sphere array on quartz chip, preparing composite SiO2 / Cu particle array, and ultrasonic separation to obtain nanometer SiO2 / Cu particle in a core-shell structure monodispersed inside solution. The composite nanometer material has surface plasma resonant absorption peak located in near infrared region, optical property in visible light and near infrared regions adjustable by means of controlling the diameter of the core and the thickness of the shell, blue shift with the increased shell thickness and red shift with increased SiO2 size. The nanometer material may find wide application in photocatalysis, sensor, optical information storing and other fields.

The invention discloses a preparation method of a ZnO-doped TiO2 hollow sphere composite photocatalyst, comprising the following steps of: preparing Zn<2+> doped carbon / titanium dioxide nuclear-shell particles by adopting a template method and a hydrolytic cladding method, and then calcinating the nuclear-shell particles to obtain the ZnO-doped TiO2 nano hollow sphere composite photocatalyst. The photocatalyst can be used for catalyzing and degrading cationic dyes under ultraviolet or solar visible light. By utilizing low-cost titanium sources, zinc sources and carbon spheres for preparing the ZnO-doped TiO2 nano hollow sphere composite photocatalyst, the preparation method has the advantages of low cost of raw materials, simple process, short preparation period, less energy consumption and belongs to green synthetic technologies. After TiO2 hollow spheres are doped and compounded by utilizing ZnO, absorption spectrums generate red shift by utilizing the interface coupling effect of the TiO2 hollow spheres and the ZnO so that the spectral response range of the photocatalyst is broadened, and the utilization rate of solar energy is improved; and meanwhile, the method can also inhibit the compounding of photon-generated carriers and improve the activity of the photocatalyst by utilizing the high conductivity of ZnO particles.

The invention discloses a synthetic method of near-infrared CdHgTe and CdHgTe / CdS fluorescence quantum point, which comprises the following steps: choosing water as dissolvent; choosing cadmium salt, mercuric salt and sodium hydride telluride as reacting forerunner body; choosing sulfhydryl group compound as stabilizer; synthesizing CdHgTe quantum point through heating directly with luminous position at 600-900 nanometer, quantum yield at 10-30% and half-peak width of sending peak at 40-70 nanometer; injecting into cadmium salt, sulfide and sulfhydryl group compound; heating; getting CdHgTe / CdS core-shell quantum point with fluorescence spectrum red shift at 10-20 nanometer. This invention possesses simple steps, warm condition and high quantum yield, which can be used to cell image formation and tissue image formation widely.

The invention discloses a method for preparing a novel Fe3+-doped TiO2 opened-port or closed-port hollow sphere composite catalyst, which comprises the following steps of: preparing a Fe3+-doped carbon / titanium dioxide nuclear shell particle by using a template method-hydrolysis cladding method and calcining for 2-4h at certain temperature to obtain the Fe3+-doped TiO2 opened-port or closed-port hollow sphere composite catalyst. The method can be applied to solar visible light catalytic degradation cation blue dye solution. In the invention, the Fe3+-doped TiO2 composite hollow sphere is prepared from ferric sources, titanium sources and carbon spheres with low cost, thereby the invention has the advantages of no pollution caused by used raw materials, simple process of method, no pollutant emission in the preparation process, short preparation period, less energy consumption and low cost, and can realize scale preparation, and the invention belongs to the green synthesis technology. A light absorption side of the composite light catalyst carries out red shift to a visible light region after the doping of Fe3+, so that the utilization ratio of the solar visible light is improved and the degradation efficiency under the visible light is greatly improved.

The invention provides a near infrared BODIPY (Boron Dipyrromethene) compound-based molecular fluorescence probe which has the following structure, wherein the substituent group Ar is one of the following four substituent groups described in the specification. The BODIPY probe with an alpha bit containing a strong electrondrawing group is synthesized for the first time, the absorption spectrum red shift of the fluorescence probe can achieve 606-633nm through the introduced substituent group, and the emission peak can achieve 616-646nm. The BODIPY molecule is a favorable fluorescence, can be used for specifically marking lysosome in biological cells, and can emit light through the self molecules, and the absorption and emission of the BODIPY molecule are close to the near-infrared zone; and in addition, the fluorescence probe has the advantages of high mole extinction coefficient, acute emission peak, high fluorescence quantum yield and the like, and has attractive application prospects on the lysosome marking application.

The invention provides a spectrum red shift antimonous navigation method for spacecraft. The method includes: directly using solar celestial bodies as light emitters in the solar system; allowing a spacecraft to receive spectral information by spacecraft-carrying spectrum red shift measurement sensors; acquiring speed parameter of the spacecraft according to spectrum red shift measured parameters and spacecraft attitude information measured by spacecraft starlight sensors; and acquiring location parameters of the spacecraft by integration. The principle of the method is simple, the method is novel and is new breakthrough in spacecraft autonomous navigation methods, the means of spacecraft navigation is expanded, navigation capacity is increased, and true autonomous spacecraft navigation is realized. The method is directly applicable to autonomous navigation tasks for deep space exploration in China, has promising application prospect in the field of deep space exploration, and provides references for antimonous navigation in near-earth spacecraft.

The invention discloses a ratio-type variant receptor mercury ion fluorescent probe and its preparation method and use. The ratio-type variant receptor mercury ion fluorescent probe has the advantages of simple synthesis processes, good light stability, the largest emission wavelength of 550nm and good chemical stability under neutral conditions. Through amide functional group tautomerism, the receptor has a deformation capability of combination of an imidic acid isomer and mercury ions and combination of an amide isomer structure and other metal ions so that the receptor has mercury ion specific combination selectivity. The probe with the mercury ion produces fluorescence spectrum red shift to 633nm and the fluorescence spectrum is enhanced by 9 times. After bonding to other metal ions especially such as congener zinc ion and cadmium ions, the probe has no obvious fluorescence change and has mercury ion specific fluorescence signal selectivity. The probe realizes mercury ion specific ratio identification, can be used in detection of mercury ions in cells and has a wide application prospect in detection of mercury ions in other organisms and environments.

There is provided an IR-absorbing naphthalocyanine dye of formula (I):whereinM is Ga(A1);A1 is an axial ligand selected from —OH, halogen, —OR3, —OC(O)R4 or —O(CH2CH2O)eRe wherein e is an integer from 2 to 10 and Re is H, C1-8 alkyl or C(O)C1-8 alkyl;R1 and R2 may be the same or different and are selected from hydrogen or C1-12 alkoxy;R3 is selected from C1-12 alkyl, C5-12 aryl, C5-12 arylalkyl or Si(Rx)(Ry)(Rz);R4 is selected from C1-12 alkyl, C5-12 aryl or C5-12 arylalkyl;Rx, Ry and Rz may be the same or different and are selected from C1-12 alkyl, C5-12 aryl, C5-12 arylalkyl, C1-12 alkoxy, C5-12 aryloxy or C5-12 arylalkoxy; andeach B is independently selected from a base, wherein BH+ has a pKa of between 4 and 9.The dye is particularly suitable for use in IR-absorbing inkjet inks, providing compatibility with known CMYK inks together with an optimally red-shifted λmax.

The invention relates to a copper-doped all-inorganic halogen perovskite fluorescent material and a preparation method and application thereof. The material has structural formula CsPb1-xCuxBr3, wherein X is in the range of 0-1; the material is a light yellow or yellow powder, and in cubic phase, and has a space group as below. The method is as below: dissolving in an organic solvent at high temperature for further reaction, washing with a hexane or toluene solvent by multiple times, purifying to obtain the copper-doped all-inorganic halogen perovskite fluorescent material with size of 10-30nm. By measuring of the UV visible (wavelength range of 350-700nm) and fluorescence spectra (excitation wavelength is 360nm with), with the increase of doping amount of copper, the absorption wavelength and corresponding fluorescence emission wavelength show the red shift phenomenon, at the same time, the fluorescence quantum yield also changes. The preparation method of the invention is simple, green and environment-friendly, and has good application potential in the preparation of LED.

The invention relates to a method for high selective identification of aluminum ions and tin ions in water phase by using a water-soluble porphyrin probe. According to the method, an ultraviolet-visible spectrophotometer and a fluorescence spectrophotometer are used for detecting the characteristic absorption peak and emission peak of water-soluble porphyrin solution to red shift to certain wavelength respectively to identify the existence of aluminum ions or tin ions in water phase; and fluorescence intensity of human lung carcinoma A549 cells are observed under an upright fluorescent microscope to judge the existence of aluminum ions. In the invention, the sensitivity is high, and rapid detection can be realized; the porphyrin probe has a simple structure and is easy to prepare, and both excitation wavelength and emission wavelength are within visible region; the operation is simple, the fabrication cost is low, and the reagent used and the operation process have no toxic and side effects; and the probe has good selectivity to aluminum ions or tin ions, metal ions such as natrium ions, kalium ions, magnesium ions, copper ions, lead ions and the like have no interference on detection, and the invention can realize detection of aluminum ions in cells.

The invention discloses an optical measuring method and device for the spatial distribution of liquid droplets of a fuel nozzle. By using a characteristic that aromatic compounds in aviation kerosene can emit red-shift fluorescence signals under the excitation of ultraviolet light with a wavelength of 266 nm, a correction scheme for solving the problem that the measurement errors of spatial distribution of fuel are caused due to the attenuation of laser energy in a droplet cone is designed. The method and device disclosed by the invention are characterized in that the spatial distribution of the liquid droplets in the fuel droplet cone can be quickly and accurately measured, and have an advantage of flow field noninterference, transient and time average results can be obtained, and a deficiency that only an average result can be obtained by a fuel accumulation method is solved. The optical measuring method for the spatial distribution of liquid droplets of a fuel nozzle disclosed by the invention can be used for measuring the spatial distribution characteristics of the liquid droplets in the droplet cone of the fuel nozzle of an aero-engine or an internal combustion engine, and for fuel which does not contain fluorescent components, a tracer agent is required to be added.

The invention relates to ball-shaped red-enhanced phosphor used in white light LEDs, and a preparation method thereof. The structural formula of the phosphor is: YxREyMzCemAl5-nAnO12, wherein RE is at least one among Tb, Gd, Sm, Yb, La, and Lu; M is at least one among Mg, Ba, Ca, and Sr; A is at least one among Ga, Cu, Zn, Ni, Ge, and Si; 1.8<x<3; 0<=y<=0.8; 0<=z<=0.2; 0<m<=0.2; 2.9<x+y+z+m<3.1; 0<=n<=0.5; and 0<y+z+n<1. The preparation method is that: proper amounts of Y salt, RE salt, M salt, Ce salt, Al salt and A salt are weighed according to the stoichiometric ratio of the elements in the structural formula; the salts are well-mixed with a proper amount of surfactant; a precursor is then prepared with a mechanical solid-phase reaction method or a coprecipitation method; the mixture is processd through vacuum-filtrating and washing; a certain amount of volatile acid is added to the mixture, such that a suspension liquid is prepared; the suspension liquid is then produced into ball-shaped precursor power through spray drying; the ball-shaped precursor power is processed through pre-sintering, and then calcined under a reductive atmosphere, such that target phosphor is obtained. The phosphor provided by the present invention is ball-shaped. Red shifts occur in the emitted wavelength of the phosphor. The phosphor has good color rendering property, and can be effectively excited by blue-light chips.

A method using polyelectrolyte self-assembly for preparing multi-layered organic molecular materials having individual layers which exhibit ultrafast electron and / or energy transfer in a controlled direction occurring over the entire structure. Using a high molecular weight, water-soluble, anionic form of poly-phenylene vinylene, self-assembled films can be formed which show high photoluminescence quantum efficiency (QE). The highest emission QE is achieved using poly(propylene-imine) (PPI) dendrimers as cationic binders. Self-quenching of the luminescence is observed as the solid polymer film thickness is increased and can be reversed by inserting additional spacer layers of transparent polyelectrolytes between each active conjugated layer, such that the QE grows with thickness. A red shift of the luminescence is also observed as additional PPV layers are added. This effect persists as self-quenching is eliminated. Charge transfer superlattices can be formed by additionally incorporating C60 acceptor layers.

An active device for dynamic control of lightwave transmission properties has at least one photonic crystal waveguide that has anti-reflection photonic crystal waveguides with gradually changed group refractive indices at both input and output side. An alternating voltage or current signal applied to two electrically conductive regions changes the refractive indices of the photonic crystal materials, introducing a certain degree of blue-shift or red-shift of the transmission spectrum of the photonic crystal waveguide. The output lightwave with frequency close to the band-edge of the photonic crystal waveguide is controlled by the input electric signal. Devices having one or more such active photonic crystal waveguides may be utilized as an electro-optic modulator, an optical switch, or a tunable optical filter.

A conjugated polymer containing boron and a preparation method and application thereof belong to the technical field of polymer photovoltaic cells. The technical problem of relatively low energy conversion efficiency of a polymer photovoltaic cell in the prior art is solved. According to the conjugated polymer containing boron provided by the invention, the structure is shown as a formula (I), a BNBP unit and a bridging unit (-Ar-) of the conjugated polymer contain multiple fluorine atoms, whereas the fluorine atoms have a very strong electron withdrawing property, which has a very big impact on LUMO energy level but a smaller impact on HOMO energy level, thus the band gap of the polymer narrows integrally, absorbs spectrum red shift, improves the light absorption power, and contributes to the light enrichment of the photovoltaic cell, and meanwhile, the fluorine atoms on a main chain of the polymer can improve the crystallization capacity of the polymer, thus enabling the polymer to have a relatively strong crystallization property, and further contributing to the realization of high electronic mobility of a material. The conjugated polymer containing boron provided by the invention is applicable to being used as an acceptor material of a high-performance polymer photovoltaic cell. The formula (I) is shown in the specification.

The invention discloses a fluorescent nano carbon point which takes a light-emitting bacterium as a carbon source and is prepared by using a method comprising the following steps: centrifugally collecting the light-emitting bacterium, putting into a mixture solution of water and 95% ethanol, pouring the mixture solution into a reaction kettle with a lining made of polytetrafluoroethylene for reaction, cooling down, subsequently pouring out the reaction solution, filtering, dialyzing the filtrate in a dialysis bag by using super pure water, changing the water every day in the period, filtering the solution in the dialysis bag by using a filtering film so as to obtain the filtrate, that is, the fluorescent nano carbon point. The carbon point disclosed by the invention is wide in raw material source, low in price and simple in preparation method; the carbon point is good in water solubility self, is not caked or agglomerated in water and is applicable to fluorescence imaging. The carbon point self also emits wavelength like a quantum dot and is also in red shift along with red shift of the excited wavelength. The bacterium which is a variety widely existing in living is applied to synthesis for the first time, and meanwhile the method can be expanded to other bacteria. The fluorescent nano carbon point disclosed by the invention can be applied to biologic imaging, biomarking and catalysis.

The invention relates to a circular dichroism enhancement device and a circular dichroism enhancement detection method based on a super-chiral light field. The circular dichroism enhancement device isformed by superposing a silicon dioxide substrate, a gold thin film, a magnesium fluoride nano-cylindrical array and a gold nano-cylindrical array from bottom to top. Vertically incident circularly-polarized light is going to the efficiently coupled into an optical resonant cavity formed by the gold thin film, the magnesium fluoride nano-cylindrical array and the gold nano-cylindrical array, andgenerates a super-chiral light field with the optical chiral density higher than that of ordinary circular polarization. When chiral molecules interact with the super-chiral light field and a resonance peak of the molecules is matched with the resonance wavelength of the resonant cavity, the circular dichroism of the chiral molecules can be greatly improved. In addition, through reducing a gap between the nano-cylindrical arrays, red shift of the resonance peak of the resonant cavity can be caused, thereby being conductive to further enhancing the optical chiral density of the light field in the resonant cavity and circular dichroism signals of the chiral molecules. The circular dichroism enhancement device and the circular dichroism enhancement detection method have the advantages of great circular dichroism signal intensity, high expandability and the like.