47results about How to "Improve up-conversion luminous efficiency" patented technology

The invention discloses an infrared laser detection card and its preparation method. The infrared laser detection card comprises the bottom substrate and the nanocrystalline powder coated in the bottom substrate and mixed with the rare earth ion, and using PVC plastic molding; the chemical composition of the said nanocrystalline powder is Si2O.Al2O3.PbF2.CdF2:Re3+, in which Re3+ is one or more combinations of the rare earth ion Yb, Er, Pr, Ho, Eu or Tm. The nanocrystal is that the rare-earth ions exists in the fluoride nanocrystal of glass ceramic, the nanocrystal size for the 10-90nm. The invention uses the rare earth nanocrystalline powder for the infrared laser detection card of luminous preparation, and when infrared laser irradiating, the rare earth ion-doped nanocrystalline powder takes luminous effect to convert the unseen infrared laser into visible light, and it can detect the infrared laser location and intensity with the 0.8-2.2 micron wavelength.

The invention discloses ytterbium and holmium codoped lithium niobate crystals and a preparation method thereof, and relates to doped lithium niobate crystals and a preparation method thereof, which solve the technical problems that the conventional lithium niobate crystals cannot be used as a laser crystal material. The ytterbium and holmium codoped lithium niobate crystals are prepared from niobium pentaoxide, lithium carbonate, ytterbium oxide and holmium oxide. The method comprises the following steps of: mixing the niobium pentaoxide, the lithium carbonate, the ytterbium oxide and the holmium oxide and baking to obtain polycrystal powder; growing crystals at equal diameter from the polycrystal powder in a single crystal growth furnace through seeding, necking, shouldering and folding by a crystal pulling method; and annealing to obtain the ytterbium and holmium codoped lithium niobate crystals. The ytterbium and holmium codoped lithium niobate crystals can emit red light and green light when activated by laser of 980nm and has a broad application prospect in the fields of optical data storage, submarine communication, optical display, color display, photoelectrons, medical diagnosis and the like.

The invention discloses a solid-state upconversion light emitting material based on triplet state-triplet state annihilation, and relates to the technical field of photon upconversion. The solid-stateupconversion light emitting material comprises a photosensitive agent and an annihilation agent with a 9,10-diphenyl vinyl anthracene structure, wherein the annihilation agent has AIE (aggregation-induction emission) effect. The solid-state upconversion light emitting material is formed by physically doping the annihilation agent into the photosensitive agent, and has the advantages that becausethe annihilation agent has regular structure in the solid state, the fluorescence quantum yield is high in the solid state, the energy transfer in the annihilation is favorably performed, the self-quenching of conversion light emitting is avoided, and the problem of self-quenching of the annihilation agent in the solid due to aggregation is certainly solved; the quick energy transfer among the triplet states of the annihilation agent in the solid is favorable for realizing the triplet state-triplet state annihilation of the molecules of the annihilation agent, and is further favorable for improving the upconversion light emitting efficiency.

The invention discloses a calcium titanate up-conversion luminescence nanoparticle prepared by using the combination of a sol-gel method and a coprecipitation method. By adding rare earth elements ytterbium and erbium, an up-conversion luminescence effect can be achieved, and the method is simple, and strong in maneuverability. Obtained materials are calcium titanate luminescence nanoparticles with an average particle size of 65 nm and with uniform size distribution, good monodispersity and good biocompatibility. The nanoparticle has a wide application prospect in the biomedicine, for example, the nanoparticle can be used as biological probes, tissue or cell imaging and drug tracers and the like; and the nanoparticle also has important applications in the field of light-emitting devices.

The invention discloses a barium fluoride up-conversion transparent ceramic and a preparation method thereof, and belongs to the technical field of optically functional materials. The existing alumina up-conversion transparent ceramic has low up-conversion luminous efficiency and is prepared difficultly. The barium fluoride up-conversion transparent ceramic utilizes barium fluoride transparent ceramic as a matrix and comprises: by mole, 60 to 89% of barium fluoride, 10 to 25% of ytterbium fluoride, and 1 to 15% of one or more of fluorides of erbium, holmium, neodymium, thulium and promethium. The preparation method comprises the following steps of blending raw material nanometer powder according to the mole percentage, wherein barium fluoride powder has particle sizes of 20 to 80nm and rare earth fluoride powder has particle sizes of 10 to 90nm, pressing the blended raw material nanometer powder into a biscuit, pre-sintering the biscuit at a temperature of 500 to 800 DEG C for 0.5 to 5 hours, carrying out vacuum sintering of the pre-sintered biscuit under the conditions of pressure of 50 to 500MPa, a vacuum degree of 10<-2> to 10<-3>Pa, a heating rate of 1 to 20 DEG C/min, a sintering temperature of 600 to 1200 DEG C and sintering time of 0.5 to 5 hours, and cooling to a room temperature at a rate of 1 to 20 DEG C/min to obtain the barium fluoride up-conversion transparent ceramic.

The invention discloses a superbright monochromatic upconversion nanoprobe for excitation/emission in a biological window as well as a preparation method and application of the superbright monochromatic upconversion nanoprobe, and belongs to the technical field of preparation of rare earth luminescent nanomaterials and biological living body imaging. The nanoprobe provided by the invention is a nano-particle which is formed by co-doping Nd<3+>, Yb<3+>, Er<3+> and Mn<2+> and has a multi-layer core-shell structure, and the chemical composition of the nanoprobe is alpha-NaYF4:Yb/Er/Mn coated CaF2:Yb coated NaNdF4:Yb. Through component optimization and structural design, the prepared up-conversion probe material obtains high-quantum-efficiency single-band red light emission under the excitation of 808nm near-infrared light. The up-conversion fluorescent probe material is unique in structure and stable in performance, has the advantages of high tissue penetration depth, high sensitivity, high resolution, high signal-to-noise ratio and the like when being applied to mouse living body imaging analysis, and has a good application prospect in the aspect of biological imaging.

The invention discloses a rare earth inorganic material as well as a preparation method and application thereof. The rare earth inorganic material is represented by a chemical formula XAF4: y% B or XAF4: y% B@XMF4, wherein X is selected from at least one of Li, Na and K, A represents sensitizing ions and is selected from Yb and/or Nd, B represents emission ions and is selected from at least one ofEr, Ho and Tm, M is selected from at least one of rare earth elements Gd, Y and Tb, and y represents the molar doping amount of B in the rare earth inorganic material and ranges from 0.01% to 40%. The material shows sensitive excitation light power dependent up-conversion luminescence and excitation light wavelength dependent down-transfer single-band emission characteristics, and the applicationof the material in multi-dimensional fluorescence anti-counterfeiting can be realized by utilizing the characteristics.

The invention relates to a magnesium, erbium and ytterbium doped sodium niobate, a preparation method and an application thereof. The preparation method comprises the following steps: S1) dissolving erbium source, ytterbium source, niobium source and sodium source in a solvent, thereby acquiring a mixed solution, wherein the solvent is a mixed solvent of water and ethylene glycol; S2) triggering the mixed solution to react for 24-48h at 260-270 DEG C, filtering and drying, thereby acquiring solid powder; S3) calcining the solid powder for 0.5-2h at 900-1050 DEG C, thereby acquiring the magnesium, erbium and ytterbium doped sodium niobate. The preparation method provided by the invention is a solvothermal method; the preparation process is simple; in the magnesium, erbium and ytterbium doped sodium niobate provided by the invention, under 980nm laser excitation, erbium ion (Er3+) is a rare earth luminescence center, ytterbium ion (Er3+) is a sensitizing ion and magnesium metal ion (Mg2+) is used for increasing the up-conversion luminescence efficiency.

The invention relates to the technical field of luminescent materials, in particular to a thermo-responsive upconversion luminescent material and a preparation method thereof. The preparation method of the thermo-responsive upconversion luminescent material comprises the following steps: 1, calcium hydroxide, aluminum hydroxide, thulium nitrate pentahydrate and ytterbium nitrate pentahydrate are added with aqueous ethanol to obtain a mixed solution, a first solvent thermal reaction is conducted to obtain a first reaction product, and then the first reaction product is calcined primarily to obtain a C12A7 material; and 2, calcium hydroxide, aluminum hydroxide and ytterbium nitrate pentahydrate are added with aqueous ethanol to be ball-milled, then the C12A7 material subjected to ultrasonicdispersion is added, a second solvent thermal reaction is conducted to obtain a second reaction product, and the second reaction product is calcined secondarily to obtain the thermo-responsive upconversion material. The technical defect that the prior art lacks in a cladding technology to improve the rare earth ion doped C12A7 material can be effectively overcome.

The invention relates to the technical field of up-conversion luminescent materials, in particular to a method for preparing up-conversion luminescent materials. First, a TiO2:Er-Yb nanocrystalline up-conversion luminescent material embedded in an amorphous matrix is ​​prepared by a sol-gel method. , and then immerse the up-conversion luminescent material in a Mo(NO3)3 solution for chemical modification, and anneal at a temperature of 500-1000° C. to prepare a TiO2-based nanocrystal up-conversion luminescent material with a core-shell structure. On the one hand, the present invention uses the amorphous embedded in TiO2:Er-Yb nanocrystals to reduce the light scattering of TiO2:Er-Yb nanocrystals, and on the other hand, utilizes the shell formed by surface modification to reduce surface states to improve upconversion luminescence It not only has the advantages of simple operation, can greatly improve the luminous performance, obtain high luminous intensity and high brightness, but also has the advantages of high luminous efficiency, especially reduces the production cost and reduces the toxicity of organic solvents.

The present invention relates to a preparation method and an application of graphene-rare earth up-conversion composite nano microspheres, and belongs to the technical field of nano drug-loaded materials. The method comprises the following steps: firstly, preparing histidine functionalized graphene quantum dots and then preparing a graphene quantum dot-rare earth fluoride up-conversion compound; and conducting loading of medicines and then conducting compounding with photothermal agent gold nanoparticles to prepare the graphene-rare earth up-conversion composite nano microspheres. Effective regulation and control of sizes and shapes of rare earth UCNP are realized by utilizing strong coordination capability of histidine and rare earth ions; up-conversion luminous efficiency of the rare earth UCNP materials is improved by utilizing strong infrared light absorption capability of nano graphene and high-efficiency energy transfer between the rare earth UCNP; and the nano-gold is used for absorbing a visible light part in the up-conversion luminescence to generate heat, so that light-controlled release of the medicines is realized.

The invention provides a method for reinforcing the upconversion luminous efficiency of a rare earth doped nano-crystal powder material. The method comprises the following steps of: pressing rare earth ion doped nano-crystal powder into a thin slice by a tablet press; irradiating the surface of the thin slice by high power laser to ensure the position of the irradiated point to be molten until a micro hole is formed; stopping carrying out laser irradiation; and cooling. According to the method provided by the invention, a preparation method, preparation conditions and a doped matrix of the rare earth doped nano-crystal powder material are not changed; other metal ions do not need to be doped; and the obvious reinforcement of the upconversion luminescence can be obtained only by carrying out secondary processing on a formed product.

The invention discloses an ytterbium and up-conversion rare earth luminescent ion double-doped potassium-sodium niobate thick film and a preparation method thereof.The preparation method comprises the steps that firstly, a niobium source is prepared, then RE3+/Yb3+ double-doped K0.5Na0. 5NbO3 sol (RE=Er, Ho and Tm) is synthesized, the sol is dried into xerogel, then the xerogel is sintered into nano powder, then a tape casting technology is adopted, pressureless sintering is conducted at the temperature of 950-1050 DEG C, and the RE3+/Yb3+ double-doped K0.5Na0.5NbO3 thick film which has a pure perovskite structure, a compact structure and fine and uniform crystal grains, and has strong up-conversion luminescence under 980 nm exciting light is obtained. The method is simple in process step, low in cost, good in repeatability and easy to operate, the thickness of the thick film is controllable, and the method is expected to be applied to the fields of microelectronic devices, information communication, clinical medicine and the like.

The invention relates to a calcium titanate nanoparticle prepared by adopting a sol-gel method and having up-conversion light-emitting effect. The strong up-conversion light-emitting function can be realized by doping rare earth element erbium, and the light-emitting intensity and light-emitting color can be adjusted according to different doping amount. The nanoparticle with small size and good appearance can be obtained by adding a certain amount of glycerol as an additive into an ethanol solvent. The sol-gel preparation method is simple, the controllability is strong, and the prepared nanoparticle is high in purity and high in yield, and has important application prospects in the field of preparation of light-emitting devices, biotissue imaging and medicine tracing.

The invention provides a measurement method for energy level radiation-free relaxation coefficients of sensitized ions and activated ions in an ytterbium and erbium co-doped sodium yttrium fluoride nanocrystal and belongs to the field of fluorescence imaging application of rare-earth doped up-conversion nanocrystals, aiming at solving the problem that the energy level radiation-free relaxation coefficient W of rare-earth ions cannot be measured through an existing method. The measurement method comprises the following steps: firstly, preparing a nanocrystal with a core-shell-shell structure; taking a NaYF4 core as the center, covering the outer side of the center with a NaYF4:Yb<3+>,Er<3+> luminous layer and taking a NaYF4 shielding shell layer as the outermost layer to obtain the nanocrystal with the core-shell-shell structure; measuring a time-resolved spectrum curve of the sensitized ions and the activated ions of the nanocrystal to obtain service life values of the sensitized ionsand the activated ions; obtaining the energy level radiation-free relaxation coefficients of the sensitized ions and the activated ions respectively according to an energy level radiation theoreticaltransition probability A=A0+W. The measurement method provided by the invention gives a relation between the environment and the energy level radiation-free relaxation coefficients and an optimal shielding shell layer thickness is determined, so that the up-conversion luminous efficiency of the rare-earth ions is improved.

The invention belongs to the technical field of rare earth luminescent materials, and discloses a Gd < 3 + >-doped micron crystal material and a preparation method and application thereof.The micron crystal material is obtained by doping Gd < 3 + > with a Y site of a matrix material LiYF4: Yb < 3 + >/Ho < 3 + > micron crystal, and the doping concentration of Gd < 3 + > is smaller than or equal to 60 mol% of the total amount of rare earth elements in the micron crystal material; the preparation method comprises the following steps: dispersing the dispersing agent in a water solvent, sequentially adding the rare earth element source and the matrix source, uniformly mixing, and preserving heat at 210-250 DEG C for 24-60 hours to obtain the micron crystal material. Gd < 3 + > is used for replacing part of Y < 3 + > in the LiYF4 crystal, so that lattice distortion of the LiYF4 crystal is realized, the field symmetry of the crystal is reduced, the transition probability and the number of excited state particles of Ho < 3 + > are increased, energy transfer between Yb < 3 + > and Ho < 3 + > is accelerated, and up-conversion luminescence of Ho < 3 + > is enhanced.

The invention belongs to the technical field of up-conversion/down-conversion luminescent materials. According to the lithium niobate up-conversion luminescent material with the core-shell structure provided by the invention, the inner core and the shell layer are rare earth element doped lithium niobate luminescent materials, so that luminescent centers exposed on the surfaces of particles can beeffectively passivated, and the up-conversion luminescent efficiency is improved. Besides, rare earth ions in the shell layer can be used for down-conversion, invisible light in an ultraviolet regionis converted into visible light, the absorption spectrum of the rare earth ions in the solar cell is expanded, and the application range of the rare earth ions in the solar cell is further expanded;and the lithium niobate up-conversion luminescent material with the core-shell structure has high conversion luminescent efficiency, can achieve up- and down-convertion, also has ferroelectric piezoelectric characteristics, and provides more excellent performance for the use of the lithium niobate up-conversion luminescent material in an integrated device. The preparation method is simple to operate and short in reaction period.