47results about How to "Luminous color adjustable" patented technology

The invention relates to an infrared-excited oxide up-conversion luminescence piezoelectric material of a bismuth lamellar perovskite-like structure and a preparation method thereof. The up-conversion luminescence piezoelectric material has a chemical general formula of Am-1-x-RxYbyBi2BmO3M<+3>, wherein R is selected from Er<3+>, Ho<3+> and Tm<3+>, A is selected from Bi<3>, Ca<2+>, Sr<2+>, Ba<2+>, Pb<2+>, Na<+>, K<+>, La<3+> and Y<3+>, B is selected from Ti<4+>, Zr<4+>, Nb<5+>, Ta<5+>, W<6+> and Mo<6+>, m is a positive integer not smaller than 2 and not more than 8, x is not smaller than 0.000001 and not more than 0.3, and y is not smaller than 3.0 and not more than 0.6. The up-conversion luminescence piezoelectric material is prepared by adopting a solid-phase reaction method, has the characteristics of good thermal stability, good chemical stability, easiness for synthesis, high luminous intensity and adjustable color, and can be widely applied to various aspects such as three-dimensional display, infrared detection, counterfeiting prevention, solar cells and photoelectric integration, micro-electro-mechanical systems, photoelectric sensing and the like.

The invention belongs to the field of composite functional materials and particularly relates to a color-tunable fluorescent carbon quantum dot/Eu<3+>/mesoporous alumina composite luminescent material, preparation thereof and application of the carbon quantum dot/Eu<3+>/mesoporous alumina composite luminescent material in the aspects of temperature sensing and optical devices. The composite luminescent material comprises fluorescent carbon quantum dots, of which surfaces contain hydroxyl or amino, and trivalent-europium-doped mesoporous alumina. According to the composite luminescent material, rare-earth trivalent europium, which emits red light under an ultraviolet lamp, and the fluorescent carbon quantum dots which emit blue light are doped into pore passages of the mesoporous alumina, then, composite fluorescent powder with dual emission peaks is obtained, and the ratio of fluorescence intensity of the two emission peaks in a relatively wide temperature range has a good linear relationship and stability, so that the rapid and effective detection and sensing of temperature can be excellently achieved, and the composite luminescent material can be applied to the aspect of temperature sensing. Due to a tunable color, the composite luminescent material can also be applied to the optical devices.

The invention discloses a preparation method of water-soluble fluorescent carbon quantum dots based on eggshell membranes and application of the carbon quantum dots in preparation of a nanogold and carbon quantum dot composite nanomaterial. The method particularly comprises the following steps that the eggshell membranes are stripped, cleaned and dried; a certain quantity of the eggshell membranes are dispersed in an alkaline solution, the dispersed solution is transferred into a hydrothermal synthesis kettle, and reacting is conducted under the condition of 150 DEG C to 210 DEG C for 6 h to 18 h; centrifugal dialysis treatment is conducted, a carbon quantum dot solution is obtained, the carbon quantum dot solution is mixed with a chloroauric acid solution, temperature-controlled reacting is conducted for a period of time, and the nanogold and carbon quantum dot composite nanomaterial with good dispersity is obtained. According to the preparation method and application of the water-soluble carbon quantum dots based on the eggshell membranes, the raw materials for synthesizing the carbon quantum dots are low in price and easy to obtain, the method is simple, the product is good in water solubility and can be used as a reducing agent of gold nanoparticles, and usage of an external toxic reducing agent is avoided. The prepared carbon quantum dots and nanogold and carbon quantum dot composite nanomaterial can be applied in the fields of sensing detection, bioimaging and catalytic conversion.

The invention belongs to the field of organic light emission, in particular to an electro-chemical deposition preparation method of high-efficiency organic light emitting film, and an application of the light emitting film in preparing high-efficiency organic electroluminescent light emitting device. The light emitting film is prepared through an electro-chemical deposition method in an electrolytic cell in the following steps: electrolytic solution preparation, electro-chemical deposition, deposition film cleaning and drying and the like; the prepared light emitted film has the advantages of simple process, high light emission rate, small impact of electro-chemical doping on efficiency, easy control of area and size and adjustable light emission color. The light emitting film can be used as a light emission layer in the organic electroluminescent light emitting device, to prepare single-layer or multi-layer high-efficiency organic electroluminescent light emitting devices and obtain dark blue light emission devices; the lumen efficiency of the devices reaches 4.436cd/A which reaches or exceeds the efficiency level of most parts prepared through the traditional part processing technologies.

The present invention belongs to the field of inorganic synthesis of optical functional material, and is especially the preparation process of white light phosphor powder for near ultraviolet LED. The preparation process includes the following steps: dissolving activator and RE oxide in the molar ratio of 0.01-0.02 in concentrated nitric acid and heating to dry, dissolving the obtain RE nitrate in deionized water to obtain solution of RE nitrate; dissolving soluble tungstate and surfactant in deionized water to obtain tungstate solution; mixing the RE nitrate solution and the tungstate solution through stirring to reaction for 25-60 min to obtain white precipitate; hydrothermal reaction of the precipitate in a reaction kettle at 100-260 deg.c for 24-72 hr; centrifugally separating, washing and drying to obtain the product. The process is simple, and has mild reaction condition and high repeatability.

The invention relates to apatite-structure fluorescent powder capable of exciting blue green light and a preparation method thereof. The chemical composition formula of the fluorophor is Sr3.5Y6.5-x-yO2(PO4)1.5(SiO4)4.5:xCe<3+>,yTb<3+>, (wherein x and y are respectively the mole percentage of rare earth ions Ce<3+> and Tb<3+> mixed in matrix material Sr3.5Y0.5O2(PO4)1.5(SiO4)4.5, 0.005 <= x <=0.500, and 0.000 <= y <=0.500). An oxide, a hydroxide or a corresponding salt of the structure formula is selected as a raw material for calcining for 3-8h at 1300-1500 DEG C under a reducing atmosphere to obtain the luminescent materials by a solid phase synthesis method. The fluorophor can match with a near ultraviolet light emitting diode, and is applied to the three primary color white light LED devices. In addition, the fluorescent powder prepared by the preparation method is high in purity, easy in operation, and free of pollution to the environment.

The invention discloses a novel liquid semiconductor quantum dot fluorescent reagent, the surface of which has positive electricity property, for imprint display and extraction in the criminal investigation field. The liquid semiconductor CdTe/NH3+ quantum dot fluorescent reagent, the surface of which has positive electricity property, is prepared by surface modification of a traditional II-VI semiconductor CdTe quantum dot with a surface modified by mercaptoacetic acid through hydrazine hydrate. The fluorescent reagent solves the key technical problem of mutual repulsion and low affinity of the traditional mercaptoacetic acid modified semiconductor CdTe/COO- quantum dot fluorescent reagent under the alkali condition because the surface charge property is the same as the imprint residue charge property, so the fluorescent reagent has application advantages in the criminal science field. The liquid semiconductor quantum dot fluorescent reagent has the advantages of high fluorescence intensity, simple preparation process and good adhesion with fresh or old imprint, and is suitable for display and extraction of imprints on most impervious objects in criminal investigation.

The invention relates to an electrophosphorescent discoloration neutral iridium complex and a preparation method thereof. O-phenylenediamine, aromatic formaldehyde, iridium trichloride, acetylacetone and the like are used as raw materials, and finally a neutral iridium complex containing reactive hydrogen is synthesized through a series of organic synthesis reactions. Researches find that the phosphorescence property of the complex does not depend on an electric field; however, the complex can present the electrophosphorescent discoloration phenomenon after tetrabutylammonium salt is added. The structural formula of the electrophosphorescent discoloration neutral iridium complex is shown as follows, wherein Ar1 and Ar2 are the same or different aromatic nucleuses.

The invention discloses a zirconium phosphate-based luminescent material. The composition of the luminescent material is shown as the following general formula: (Ln1-yTby)0.33Zr2(PO4)3, wherein y is more than or equal to 0 and less than or equal to 1; and Ln is a trivalent ion of one or more of Y, La, Gd and Lu. The zirconium phosphate-based luminescent material can be prepared by adopting a high temperature solid phase method or a chemical solution method. The luminescent material can be used as a blue-white, yellow-green or green VUV (Vacuum Ultraviolet) fluorescent material and can also be used as a yellow-green or green scintillator material for application to X ray medical imaging, high-energy ray safety detection, light-emitting diodes, display apparatuses, tricolor fluorescent lamps and field emission displays. Moreover, a preparation process of the zirconium phosphate-based luminescent material is safe, is easy and convenient to operate, is suitable for large-scale production and belongs to environment-friendly, low-energy-consumption and high-benefit industries, raw materials have low costs and are readily available, and basically no industrial three wastes are produced in the reaction process.

The invention discloses a fluorescently-labeled hydroxyapatite hollow microsphere and a preparation method thereof. The fluorescently-labeled hydroxyapatite hollow microsphere has a chemical formula of Ca (1-x) Rex (PO4) 0.6 (OH)0.2, wherein x is 0.005-1 and RE is one or several of Eu, Er, Ho, Pr, Tm, Sm and Tb; the outside diameter of the microsphere is 100-600mu m; and the wall thickness of the microsphere is 30-100mum. The preparation method comprises the following steps: preparing a mixed solution of calcium salts and RE (NO3)3 and phosphate solution or phosphoric acid; then fully mixing the mixed solution and the phosphate solution or phosphoric acid under ultrasonic treatment; adding an aqueous water of sodium carboxymethylcellulose; impregnating a styrene microsphere; and carrying out drying, thermal treatment and sintering to obtain the fluorescently-labeled hydroxyapatite hollow microsphere. According to the fluorescently-labeled hydroxyapatite hollow microsphere, the luminous colors and strength adjustment of the microsphere can be realized, so that the fluorescently-labeled hydroxyapatite hollow microsphere has higher application flexibility; according to the preparation method, due to the selection of hydroxyapatite and rare earth ions which have relative-favorable biocompatibility, the problems of fluorescence decay and the like caused by change of an organic structure are solved while environment pollution or physiology toxicity can be avoided.

The invention provides a luminous material, a preparation method of the luminous material and a white light LED (light emitting diode) device. The luminous material is applicable to purple light or fluorescence excited by a near ultraviolet light LED, and has the advantages of high quantum yield, high thermal stability and adjustable luminous color. The luminous material provided by the invention belongs to a luminous material capable of emitting complementary colors obtained through the preparation by using first chlorophosphates and second chlorophosphates; the first chlorophosphates are (Sr<8-x-z>Mgx)Si4O8Cl12:zEu<2+>, wherein the x is greater than 0 but smaller than or equal to 0.8, and the z is greater than or equal to 0.01 but smaller than or equal to 0.05; the second chlorophosphates is Sr<8-y-t>Cay)Si4O8Cl12:tEu<2+>, wherein the y is greater than 0 is smaller than or equal to 0.6, and the t is greater than or equal to 0.01 but is smaller than or equal to 0.05. The preparation method of the luminous material has the advantages that the preparation method is simple; the operation is easy; no pollution is caused; the cost is low. The white light LED device has the advantages of good average color rendering property, high dark red color development index and brightness.

The invention relates to a luminescent polyvinyl alcohol material and a preparation method thereof. The preparation method comprises the following steps: dissolving polyvinyl alcohol, aldehyde acid and a europium ion compound in a solvent, adjusting the pH value to neutrality or alkalinity, performing thermal synthesis reaction for 0.5-24h in a hydrothermal solvent at 60-140 DEG C, and performingdrying to obtain the luminescent polyvinyl alcohol material. By the thermal mode of the hydrothermal solvent, the valence states of some europium ions are changed; by combination with the aldehyde acid with two functional groups, simultaneously, the europium ions with different valence states are bonded to polyvinyl alcohol molecules, thereby obtaining the luminescent polyvinyl alcohol material with adjustable luminescent color; and furthermore, adverse effects caused by single physical mixing are overcome, and the compatibility between europium ions and polyvinyl alcohol is good. The obtainedluminescent polyvinyl alcohol material is high in brightness and has good light transmittance and excellent mechanical properties; and the luminescent polyvinyl alcohol material with adjustable luminescent color has important application values in the aspects of decoration, counterfeiting prevention, illumination and display.

A semiconductor luminescent material with adjustable luminescent colours is disclosed, and is a doped ZnO/pure ZnO core-shell structure, wherein doped ZnO is used as a core, pure ZnO is coated on the surface of the doped ZnO core to form a shell layer; doping ions diffusing to the shell layer form the core due to self-purification effect are contained in the pure ZnO shell layer; the size of the doped ZnO core is 15 nm; and the thickness of the pure ZnO shell layer is 3-5 nm. The semiconductor luminescent material with adjustable luminescent colours disclosed by the invention has the advantages of overcoming the self-purification effect of doped semiconductor and increasing doping efficiency by the coating of pure ZnO on surface, realizing the combination of pure ZnO and doped ZnO, enriching energy level distribution, and being capable of adjusting the luminescent colours of the material by changing excitation wavelength because of being a doped ZnO/pure ZnO core-shell structure; additionally, the luminescent material is prepared by means of solution synthesis, as well as is simple in process, easy in operation, decreased in equipment cost, and easy in large-scale production.

The invention discloses a preparation method of Bi3+/Eu3+ co-doped lutecium acid salt-based fluorescent powder and the prepared fluorescent powder. The general chemical formula of the fluorescent powder is Ba3Lu4(0.98-y)O9:0.08Bi3+,4yEu3+ (0 < = y < = 0.08), wherein the preparation method is a high-temperature solid-phase method, namely, raw materials are mixed according to the stoichiometric ratio and sintered for 5 hours at the temperature of 1550 DEG C under the normal pressure and air atmosphere, and finally the sintered product is crushed to obtain the fluorescent powder material. The preparation process is simple, and parameters are easy to regulate and control. The fluorescent powder can be excited by ultraviolet light or near ultraviolet light, the excitation spectrum range is wide, the luminous intensity is high, the thermal stability is good, the luminous color of the fluorescent powder can be adjusted from a yellow-green light area to an orange light area along with the increase of the doping concentration of Eu3+ ions, different luminous requirements can be met, and the fluorescent powder has the application potential in the aspect of LEDs.