50results about How to "Short fluorescence lifetime" patented technology

The present invention relates to an organic light emission diode device (OLED) structure, especially to a high-efficiency organic light emission diode device of a B-containing compound. The organic light emission diode device structure comprises an anode, a cavity injection/transmission layer, a luminescent layer, an electron injection/transmission layer and a cathode, wherein the luminescent layer comprises main body materials and doped materials; the main body materials are formed by signal materials and are also formed by mixing materials with different structures; and the doped materials are organic compounds containing boron, the energy level difference of the singlet state and the triplet state is not larger than 0.2ev, and the energy level of the singlet state and the energy level of the triplet state of the of the main body materials are both higher than that of the doped materials to prevent energy from passback and avoid reduction of the device luminescence efficiency. The present invention further provides a preparation method of the organic light emission diode device. The preparation method is utilized to obtain the organic light emission diode device which is high in efficiency, long in life and high in purity.

The present invention relates to an electroluminescence device based on a boron-containing organic compound, wherein a main body material comprises a first organic compound and a second organic compound, the difference between a singlet state energy level and a triplet state energy level of the first organic compound is not greater than 0.2 eV, the singlet energy level of the second organic compound is greater than the singlet energy level of the first organic compound by more than 0.1 eV, and the triplet energy level of the second organic compound is greater than the triplet energy level of the first organic compound by more than 0.1 eV; the first organic compound and the second organic compound have the different carrier transport characteristics, wherein an object material is the boron-containing organic compound, the singlet energy level of the object material is lower than that of the first organic compound, and the triplet energy level of the object material is lower than that ofthe first organic compound. An organic light-emitting device prepared by the method has the characteristics of high efficiency and long service life.

The garnet-type crystal for a scintillator of the present invention is represented by General Formula (1), (2), or (3),

Gd_3-x-yCe_xRE_yAl_5-zGa_zO₁₂  (1)

wherein in Formula (1), 0.0001≦x≦0.15, 0≦y≦0.1, 2<z≦4.5, and RE represents at least one selected from Y, Yb, and Lu;

Gd_3-a-bCe_aLu_bAl_5-cGa_cO₁₂  (2)

wherein in Formula (2), 0.0001≦a≦0.15, 0.1<b≦3, and 2<c≦4.5;

Gd_3-p-qCe_rRE′_qAl_5-rGa_rO₁₂  (3)

wherein in Formula (3), 0.0001≦p≦0.15, 0.1<q≦3, 1<r≦4.5, and RE′ represents Y or Yb.

Belonging to the technical field of luminescent materials, the invention in particular relates to a broad-band near-infrared emission luminescent substance, in particular to a material capable of generating red light and near-infrared emission in a range of 700nm-1600nm under the excitation of ultraviolet, purple light, blue light and red light, and further discloses a preparation method of the material and a luminescent device containing the luminescent material. The broad-band near-infrared emission luminescent substance includes an inorganic compound with a molecular formula of AaDbMcEdOe:xCr. The luminescent substance has a strictly occupied ordered structure, and the material is a single substance, adopts Cr as the optical active center, can well absorb ultraviolet light, blue light and red light, and under the excitation of ultraviolet or purple light or blue light, can realize broad-band red light and near-infrared emission in the range of 700nm-1600nm, and has shorter fluorescence lifetime.

The invention is an L-type zeolite/high polymer luminescent material and a preparation method thereof. The material is composed of zeolite, rare earth ion (Ln3+), organic ligand and macromolecule; its proportion is: 0.0025-0.25mmol rare earth ion/100mg zeolite/8mg organic ligand, and the mass ratio is zeolite-rare earth organic complex:high Molecule=1~5:100. In the present invention, the method of copolymerizing the zeolite loaded with the rare earth organic complex and the polymer effectively suppresses the influence of water molecules and other organic molecules on the luminescence of the rare earth organic complex in the zeolite channel, and at the same time inhibits the leakage of the organic molecule from the zeolite channel, and The material is optically transparent and exhibits the characteristic fluorescence of rare earth ions under ultraviolet light, and can be used in infrared plastic light-emitting diodes, optical data storage devices such as dye nanostructure materials, and improving the physical and chemical properties of polymers.

The invention relates to scintillation microcrystalline glass embedded with a YAG microcrystalline phase and a preparation method of the scintillation microcrystalline glass. The scintillation microcrystalline glass and the preparation method thereof are characterized in that the microcrystalline phase is YAG, activation ions are one or two of Ce<3+> and Tb<3+>, the activation ions are evenly doped into the YAG microcrystalline phase, and the YAG microcrystalline phase is evenly distributed in the scintillation microcrystalline glass; the chemical components of matrix glass are only yttrium oxide and aluminum oxide, the matrix glass is doped with the rare-earth ions Ce<3+> and Tb<3+>, transparent glass is prepared by a container-free solidification method or a flame floatation method, thetransparent glass is subjected to thermal treatment under Tg temperature, and the YAG microcrystalline phase is spontaneously separated out without devitrification; the YAG microcrystalline glass is high in crystallinity and transparency, short in fluorescence service life, excellent in scintillation performance, capable of emitting green light, green and yellow light or yellow light under X-ray excitation and capable of being used as an X-ray detection scintillation material.

The invention discloses rare earth phosphate scintillating glass and a preparation method of the same, and relates to the field of inorganic rare earth luminous material. Trivalence cerium ions (Ce 3+) are added into a M2O-RE2O3-P2O5 phosphate glass system, and a transparent rare earth scintillating glass is produced. In the phosphate system, M is an alkali metal element and RE is a rare earth element. The transparent rare earth scintillating glass is produced through processes of mixing raw materials, pre-sintering, melting, moulding and annealing. The prepared transparent rare earth phosphate scintillating glass has strong light output in the range of 310 to 430 nanometers under the radiation of X-rays. The fluorescence attenuation lifetime is around 30 nanoseconds, and has a rapid fluorescence attenuation characteristic. The preparation method of rare earth phosphate glittering glass has the advantages of simple preparation technology, low production cost, strong light output, rapid fluorescence attenuation, and wide application prospect in high-energy ray detection field.

The invention provides a metal coordinated polymer material capable of rapidly transmitting phosphorescence, a preparation method for the metal coordinated polymer material and an application of the metal coordinated polymer material. According to the material, a compound represented by a formula (I) shown in the description is a ligand compound, wherein X, Y and Z each is independently selected from N and C; ~Q-R2 is selected from a formula shown in the description and a formula shown in the description; when the ~Q-R2 is the formula shown in the description, the structure is directly connected with the Z; when the ~Q-R2 is the formula shown in the description, the structure is connected with the Z through a single bond; R1 is selected from H, -COOH and -COOCH3; R2 is selected from H, a formula shown in the description and a formula shown in the description; and R3 is selected from -COOH and -COOCH3. The invention provides a series of efficient novel D-A long-life luminescent materials, novel ways of think and novel methods for material synthesis of efficient novel D-A long-life luminescent devices are provided, and a new breakthrough for achieving further development of full-color display and solid-state luminescence is found.

A full solid state electro-optic modulation Q green laser adopts a V-shaped folding cavity. An optical coupled system, a plano-concave front cavity mirror, a laser crystal, a polarizer, a 1/4 wave plate, an electro-optic modulation Q crystal and a negative meniscus shaped refrative mirror are sequentially arranged along the direction of advance of the laser output by a laser diode. The reflected light path of the negative meniscus shaped refrative mirror is sequentially provided with a frequency doubling crystal and a plano-concave rear cavity mirror. The laser has the advantages of compact structure, high output pulse repetition rate, narrow pulse width, high beam quality, and the like, and can be widely applied to the fields such as laser material processing, laser color display, laser medicine, military confrontation, undersea detection, etc.

The present invention provides electroluminescent materials that emit very bright light with little energy consumption, little loss of energy converted into heat, etc., and suffers from little deterioration due to long-term use, in particular, inorganic electroluminescent materials that emit blue to green light having a wavelength shorter than yellow. Specifically, the present invention relates to the following three types of electroluminescent material:

(1) An electroluminescent material including an oxide having a perovskite-type crystal structure represented by General Formula RMO₃, wherein R is at least one rare-earth element, and M is at least one member selected from the group consisting of Al, Mn, and Cr;

(2) an electroluminescent material including an oxide having a perovskite-type crystal structure represented by General Formula R₂CuO₄, wherein R is at least one rare-earth element; and

(3) an electroluminescent material including an oxide having a perovskite-type crystal structure represented by General Formula RZ₂Cu₃O₆, wherein R is at least one rare-earth element, and Z is at least one alkali-earth metal.

The invention discloses a method for regulating the fluorescence lifetime of a near-infrared core-shell structure nanocrystal, and relates to a method for regulating the fluorescence lifetime of the near-infrared nanocrystal. The method solves the technical problem that the fluorescence lifetime of an existing rare earth doped nanocrystal cannot be regulated. The method comprises the following steps: enabling the near-infrared core-shell structure rare earth doped nanocrystal to be of a cubic phase NaYF4:Yb,Nd,E@CaF2, a hexagonal phase NaYF4:Yb,Nd,E@NaYF4, a hexagonal phase NaYF4:Yb,Nd,E@NaLuF4 or a hexagonal phase NaYF4:Yb,Nd,E@NaGdF4, wherein fixedly doped ions are Yb and Nd, a variably doped ion is E, and E is Yb, Er, Ho, Tm or Nd; and the fluorescence lifetime of the nanocrystal is regulated by changing the concentration of the E ion. The time gating imaging technology can be applied onto compound imaging by regulating the nanocrystals with different fluorescence lifetimes synthesized in a near-infrared region.

Terbium doped phosphate-based green luminescent material and preparation method thereof are provided. The chemical formula of the material is M₃RE_1-xTb_x(PO₄)₃, wherein, M is alkaline-earth metals, RE is rare-earth elements, x is in a range of 0.001 to 1. The preparation method of the material includes the following steps; providing the compound used as the source of alkaline earth metal, the compound used as the source of phosphate, the compound used as the source of rare-earth, and the compound used as the source of Tb³⁺ according to the molar ratio of the elements in M₃RE_1-xTb_x(PO₄)₃, wherein, the compound used as the source of phosphate is added at excess molar ratio in a range of 10% to 30%; mixing and grinding the compound to get mixture; sintering the mixture as pre-treatment, and then cooling the mixture to get a sintered matter; grinding; calcining in reducing atmosphere, and then cooling them.

The invention relates to a preparation method of a red divalent bismuth ion doping calcium phosphate fluorescent material, which comprises the following steps of: taking a compound raw material containing calcium, phosphorus and bismuth, wherein the molar ratio of calcium: phosphorus: bismuth: 2 (1-x): 2: 2x, wherein X is larger than or equal to 0.00001 and is less than or equal to 0.08; grinding, uniformly mixing and then presintering, and controlling the temperature to be in the range of 900 to 1200 DEG C; after presintering, grinding again, uniformly mixing and then burning at high temperature, controlling the temperature to be in the range of 800-1000 DEG C; and finally placing a sample at the reducing atmosphere of 900-1200 DEGC for reacting for 15 minutes to 10 hours. The fluorescent material prepared by the method has the ultraviolet and blue light spectral region absorption function, has red fluorescent lights covering 600nm-750nm sections under the excitation of ultraviolet or blue lights; the fluorescence lifetime of the fluorescent material is about 10 microseconds; the fluorescence light of the fluorescent material has good heat resistance hardening characteristic; when the temperature is risen from 10k to the room temperature, the fluorescent intensity of the fluorescent material is reduced by less than 10%, and the fluorescence lifetime of the fluorescent material is shortened by less than 5%.

The invention discloses a method for enhancing rhodamine B isothiocyanate fluorescence intensity through silver nanoparticle aggregation. The method comprises the following steps: (1) preparing silvernanoparticles; (2) modifying the surfaces of the silver nanoparticles with rhodamine B isothiocyanate to obtain silver nanoparticles with the surfaces modified with rhodamine B isothiocyanate; and (3) adding a connecting agent, and aggregating the silver nanoparticles with the surface modified by rhodamine B isothiocyanate to enhance the fluorescence intensity of the rhodamine B isothiocyanate. According to the method, a hot spot generated by aggregation and coupling of precious metal nanoparticles is mainly utilized, so that a local electric field among the nanoparticles is remarkably enhanced, the fluorescence emission efficiency of rhodamine B isothiocyanate on the surface of the nanoparticles is improved, and rhodamine B isothiocyanate fluorescence quenched by silver nanoparticles under monodispersion is recovered and even enhanced. The method is obvious in fluorescence enhancement, the sample can be dispersed in a water phase, and fluorescence change is obvious before and after aggregation.

The invention provides a perovskite quantum dot material and a preparation method and application thereof, wherein the preparation method comprises the following steps: mixing cesium carbonate, octadecene and oleic acid under a vacuum condition, and heating until the cesium carbonate and the oleic acid are completely reacted to obtain a cesium oleate solution; heating and dissolving lead bromide and octadecene under a vacuum condition to obtain a lead precursor solution; heating cerium bromide and oleic acid under a vacuum condition until the cerium bromide is completely dissolved to obtain a cerium precursor solution; and respectively injecting oleylamine and a cerium precursor solution into the lead precursor solution under environmental conditions, heating the mixed solution to 170-190 DEG C until lead bromide is completely dissolved under vacuum conditions, then injecting a cesium oleate solution into the mixed solution under environmental conditions, carrying out stirring reaction for 40-80 seconds, and carrying out ice-water bath cooling and centrifugation to prepare the cerium ion doped perovskite quantum dot material. The rare earth ion doped perovskite quantum dot material can effectively solve the problem that fluorescence quenching easily occurs in a high-pressure environment in an existing perovskite quantum dot material.

The invention relates to a UCNPs @ MIL-53 nano composite material and preparation method thereof, comprise up-converting fluorescent material UCNPs of parent nucleus and organically coat that parent nucleus UCNPs; Metal skeleton material MIL-53, and that particle size of the parent nucleus UCNPs is 153-0nm, UCNPs@MIL The particle size of 53 nanocomposites is 50-100nm. The UCNPs @ MIL-53 nanocomposites will upconvert the unique fluorescence properties of fluorescent nanomaterials with MIL-53 Combined with excellent drug-loading materials, it is expected to achieve a dual-functional therapeuticsystem integrating biological imaging and drug controlled release.

The invention relates to a dysprosium doped lead fluoride crystal which has a molecular formula of DyxPbF2+3x, wherein x is the doping concentration of Dy<3+> and is equal to 0.1-10 mol percent. The crystal grows by adopting a melt method. A preparation method of the dysprosium doped lead fluoride crystal comprises the following steps of: 1, selecting the value of x, weighting the initial raw materials of DyF3 and PbF2 in a crystal growing formula according to the molecular formula of the DyxPbF2+3x in accordance with the stoichiometric proportion, wherein x=0.1-10 mol percent; and 2, uniformly mixing the weighted raw materials in the proportion, drying in vacuum and pressing into blocks, placing a graphite or platinum crucible, with a PbF2 crystal as a seed crystal, growing gases of atmosphere of argon or CF4 and the like. The dysprosium doped lead fluoride crystal has lower phonon energy, longer fluorescence lifetime and larger absorbing and transmitting section, and is possible to apply to an all-solid laser of 2-5mum waveband.

Provided is an apparatus for investigating a molecule comprising a channel disposed in a substrate, a metallic moiety capable of plasmon resonance which is associated with the channel in a position suitable for the electromagnetic field produced by the metallic moiety to interact with a molecule passing therethrough, means to induce a molecule to pass through the channel, means to induce surface plasmon resonance in the metallic moiety; and means to detect interaction between the electromagnetic field produced by the metallic moiety and a molecule passing through the channel. Methods of investigating molecules are also provided.

The invention belongs to the technical field of preparation and application of organic photoelectric materials, and discloses an indolocarbazole diboron derivative and preparation and application thereof.According to the indolocarbazole-based diboron derivative, R1 and R2 are introduced to the two sides of five types of indolocarbazole such as indolo [2, 3-a] carbazole; r1 and R2 are selected from aromatic amine groups with the carbon atom number of 6-30 and aromatic amine heterocyclic groups with the carbon atom number of 6-30; and atoms for bonding R1 and R2 with boron atoms are carbon atoms and are positioned on ortho-positions of nitrogen atoms contained in R1 or R2. The diboron derivative of indolocarbazole disclosed by the invention can realize narrowing of the half-peak width of a luminescent spectrum based on a boron-nitrogen multiple resonance effect, can realize regulation and control of the luminescent spectrum in a relatively large range based on molecular conjugation regulation and control, is relatively wide in color gamut coverage range, and can be used as a luminescent material to be applied to an organic electroluminescent device to obtain relatively high device efficiency.

The invention discloses a kit, a probe and a method for rapid and sensitive detection of ofloxacin. The kit comprises a nano magnetic bead-nucleic acid aptamer probe, an RCA primer, an RCA template, aT4 DNA ligase, a Phi29 DNA polymerase and a NaYF4: Ce/Tb-cDNA time-resolved fluorescent probe. Fe3O4 nano magnetic beads are used as a rapid magnetic separation carrier, a nucleic acid aptamer specifically combined with ofloxacin is used as a recognition element, a nucleic acid signal is amplified through a rolling circle amplification technology, and time-resolved fluorescence is used as a signal source so that a novel technology for specific rapid sensitive detection of residual antibiotic ofloxacin in food is constructed. The method is short in detection period without depending on the chromatographic instrument and high in sensitivity and is as low as pmol/L in detection limit and quantification limit and is suitable for detection personnel in the market or enterprises.