316 results about "Triboluminescence" patented technology

An organic electroluminescent device is disclosed, comprising a substrate having thereon a light-emitting layer sandwiched by an anode and a cathode, wherein the light-emitting layer comprises at least: (1) a host material having electron-transporting or hole-transporting property, (2) Compound A capable of phosphorescence emission at room temperature, and (3) Compound B capable of phosphorescence emission or fluorescence emission at room temperature and having the maximum light emission wavelength longer than the maximum light emission wavelength of Compound A, and the maximum light emission wavelength of said device is attributable to said (3). The light emission attributable to (3) is intensified by (2) to elevate the light emission efficiency and by selecting a fluorescent compound as (3), the device can be prevented from aging deterioration of the luminance.

The present invention relates to organic light emitting devices (OLEDs), and more specifically to OLEDS that emit light using a combination of fluorescent emitters and phosphorescent emitters for the efficient utilization of all of the electrically generated excitons.

The invention discloses an organic mixture, a composite containing the organic mixture, an organic electronic device and application. The organic mixture comprises a first main material H1, a second main material H2 and an organic fluorescence radiation material E1, wherein the second main material H2 and the first main material H1 form a composite excited state material. The first main material H1 and the second main material H2 have II-type heterogeneous structures, and the radiation wavelength of the organic fluorescence radiation material E1 is larger than or equal to the radiation wavelength of the composite excited state material formed by the first main material H1 and the second main material H2. According to the solution, a radiation device is low in manufacturing cost, high in efficiency, long in service life and low in roll-off.

A novel optical ruler based on ultrahigh-resolution colocalization of single fluorescent probes is described. Two unique families of fluorophores are used, namely energy-transfer fluorescent beads and semiconductor nanocrystal (NC) quantum dots, that can be excited by a single laser wavelength but emit at different wavelengths. A novel multicolor sample-scanning confocal microscope was constructed which allows one to image each fluorescent light emitter, free of chromatic aberrations, by scanning the sample with nanometer scale steps using a piezo-scanner. The resulting spots are accurately localized by fitting them to the known shape of the excitation point-spread-function of the microscope.

The invention relates to a preparation method and application of electrospinning nanofiber. The preparation method is as follows: synthetic and/or natural polymer materials are dissolved in a volatilesolvent under normal temperature and normal pressure, functional substances are added, and nanofibers are obtained by electrospinning; the functional substances comprise, but are not limited to an odor substance, an organic fluorescent compound, a pigment, a temperature sensitive luminescent and color changing material, a cell growth factor, a hemostatic substance, one or a plurality of nutrientsincluding hyaluronic acid, collagen, and the like which promote skin growth. The nanofiber made by electrospinning has the special effects of sterilization, aromatic odor, fluorescent luminescence, multiple colors, temperature sensitive luminescence and color-changing, promoting wound healing, promoting inhibition and interfering with body function, maintaining skin cell vitality and the like. The method can be used in air purification, automotive air purification, fresh air systems, medical, beauty care, and other nanofiber products.

The invention relates to a preparation method for a self-assembly carbonitride nanotube. The preparation method comprises the following steps: adding melamine into glycol to form a saturated solution: slowly adding an aqueous solution of nitric acid with a concentration of 0.12 +/- 0.02 mol/L into the saturated solution until a great amount of white precipitate is generated, centrifugating the white precipitate, rinsing the white precipitate with ethanol and drying the white precipitate at a temperature of 60 +/- 10 DEG C so as to obtain white powder; and calcining the obtained white powder in a muffle furnace at a temperature of 350 +/- 10 DEG C for more than 0.6 h so as to obtain the self-assembly carbonitride nanotube. The preparation method provided in the invention has the advantages of mild preparation conditions, low sintering temperature, a simple process and energy conservation; the nanotube synthesized by using the preparation method has excellent photo-conductive performance, emission wavelength of fluorescence of the nanotube can generate wavelength red shift as sintering time prolongs, and the nanotube can generate fluorescence of a variety of colors after doped by rare earth metal ions.

Provided are a hybrid white organic light emitting diode (OLED) and a method of fabricating the same. A HOMO level difference between a fluorescent emission layer and an electron transport layer in an organic emission layer (OLED) becomes higher than that between the other layers or a LUMO level difference between a fluorescent emission layer and a hole transport layer is higher than that between the other layers, so that a recombination region is restricted to a part of an emission layer to obtain high-efficiency fluorescent light emission. In addition, triplet excitons that are not used in a fluorescent emission layer are transferred to an auxiliary emission layer formed to be spaced apart from a recombination region by a predetermined distance to emit light in a different color from the fluorescent emission layer, so that both singlet and triplet excitons formed in the OLED are used to obtain high-efficiency white light emission.

The invention provides a preparation method of a carbon dot/chitosan in-situ composite material. The carbon dot/chitosan in-situ composite material is prepared by an in-situ method. The method comprises the following steps: carrying out microwave treatment on a chitosan solution to obtain a carbon dot/chitosan in-situ complex, and preparing the carbon dot/chitosan in-situ complex into the carbon dot/chitosan in-situ composite material. According to the method, a carbon dot/chitosan in-situ composite film material is prepared by a casting and film-forming method, and a carbon dot/chitosan composite coating material is prepared by a controllable electro-deposition method. The preparation method of the carbon dot/chitosan in-situ composite material has the advantages of being simple, convenient to operate, mild in preparation conditions and easy to control; equipment used by the method is simple and convenient, has energy conservation and environment protection effects, and is low in cost; the carbon dot/chitosan composite film material has good application prospects in the fields of fluorescent biological film materials, optical film materials, biological detectors and fluorescent light-emitting materials. The carbon dot/chitosan composite coating material has good application prospects in the fields of surface decoration and surface patterning of metal biological materials, biological electrodes, biological chips and biological devices.

A fluorescent light emitting element includes a substrate; a phosphor layer that is provided on the substrate; an adhesive layer that is provided between the substrate and the phosphor layer; and a reflection unit that is provided between the adhesive layer and the substrate or between the adhesive layer and the phosphor layer. The phosphor layer is formed of a sintered body made of a cerium-activated garnet structure phosphor containing 0.05 atm % cerium, and a thickness of the phosphor layer is in a range of 100 μm to 250 μm.

The invention provides a preparation method of a nitrogen doped carbon based quantum dot. According to the method, a cheap carbon source and nitrogen source are directly mixed, and then the mixture is carbonized by microwaves to prepare nitrogen doped carbon based quantum dots. In the prepared nitrogen doped carbon base quantum dot, nitrogen exists on the surface and skeleton structure of carbon based quantum dot in four chemical states: amino group, pyridine, pyrrole, and nitrogen-containing four-membered ring; furthermore, nitrogen chemical state relative contents and optical characteristics are adjustable; the prepared nitrogen doped carbon based quantum dot has the advantages of high fluorescence radiation efficiency and good catalytic effect, and the performance of the quantum dot can be further improved through modification, and the modified quantum dot can be applied to the fields such as catalysis, and the like. Moreover, in the preparation process, the nitrogen source and carbon source are directly mixed and carbonized, no wave absorbing material is needed, and the whole preparation process is simple and quick. The obtained carbon based quantum dot is insoluble in water, so the separation and purification of carbon based quantum dot can be completed in a short time, the yield is high, and the preparation method has an important meaning for production, application, and promotion of carbon based quantum dot.

The invention relates to a preparation method and application of a temperature sensitive type Y2SiO5:Eu intelligent thermal barrier coating. The preparation method comprises the steps that nanometer yttrium oxide powder, micrometer silicon dioxide powder, nanometer europium oxide powder and LiYO2 powder are subjected to ball-milling and high-temperature sintering to obtain ceramic aggregate powder Y2SiO5:Eu powder which is then dispersed into 1-methyl pyrrolidone; polyving alcohol is added to enable the ceramic aggregate powder Y2SiO5:Eu powder to be dispersed completely and then ultrasonic oscillation is conducted; then a mixed binder is added to conduct L-S phase conversion preparation, and obtained coated Y2SiO5:Eu microballons are sprayed on the surface of a high-temperature alloy sample with a metal bonding layer to form a fluorescent layer with the thickness being 3-50 [mu]m; and then a Y2SiO5 coating is sprayed on the surface of the fluorescent layer according to the same spraying process, so that the temperature sensitive type Y2SiO5:Eu intelligent thermal barrier coating is obtained and can be used in coating temperature measurement. The prepared thermal barrier coating has the advantages that the surface is even, no microcrack occurs, the thickness is uniform, no penetrating hole exists, and the bonding force is good. In addition, excellent fluorescent emitting performance and a temperature fluorescent effect are achieved, and the temperature sensitive type Y2SiO5:Eu intelligent thermal barrier coating can be applied to the field of fluorescent temperature measurement of coatings.

The invention discloses an organic light emitting device and a display panel. The organic light emitting device includes a first electrode, a second electrode disposed opposite to the first electrodeand a light emitting layer disposed between the first electrode and the second electrode, the light emitting layer comprising a host material, a light emitting object comprising a fluorescent dye, andan auxiliary object comprising an organic substance having a thermally activated retarded fluorescence characteristic. The auxiliary object with TADF characteristic makes the maximum external quantumefficiency of fluorescent light emitting device equal to that of phosphorescent light emitting device, realizes the effect that the luminous efficiency of fluorescent light emitting device is equal to that of phosphorescent light emitting device, and improves the luminous efficiency of fluorescent light emitting device. Compared with phosphorescent materials, fluorescent dye contains no preciousmetals and is cheap, which greatly reduces the cost of organic light emitting devices.

The invention discloses a hydro-thermal preparation method for spherical boric acid yttrium doped europium fluorescent powder in a hollow structure. 0.01 to 1.0 mole/liter yttrium ions, europium ions and boric acid are mixed, the mole ratio of the yttrium ions to the europium ions to the boric acid in the mixed solution is 19/1/20, organic topography induction reagents are added into the mixed solution, the ratio of the mol number of the added organic topography induction reagents to the sum of the mol number of the yttrium ions and the europium ions is 3/2, 1 to 8 milliliters of nucleating reagents are added into the mixed solution, and suspending liquid is obtained; the alkali liquor is used for regulating the pH to be 8 to 10; the suspending liquid is moved into a 100mL reaction kettlefor carrying out hydrothermal reaction; and the heat treatment is carried out on powder products after the hydrothermal reaction, and the spherical fluorescent powder in the hollow structure is obtained. The spherical boric acid yttrium doped europium fluorescent powder has the smaller specific gravity because of the adoption of the hollow structure, and requirements of luminescent devices on light weight of fluorescent luminescent materials can be met.

An organic compound layer includes a fluorescent light-emitting sub-layer, a phosphorescent light-emitting sub-layer, and an exciton generation sub-layer which is disposed therebetween and which generates excitons. The interface between the fluorescent light-emitting sub-layer and the exciton generation sub-layer serves as an energy barrier for carriers. Excitons are generated on the exciton generation sub-layer side of the interface therebetween.

The invention provides an orange light emitting carbon nano dot, which comprises a nitrogen-enriched carbon based core and a cation passivation layer that wraps the surface of the nitrogen-enriched carbon based core. The provided orange light emitting carbon nano dot has a specific core-shell structure, which improves the light emitting efficiency of the orange light emitting carbon nano dot in the wave band of orange light. The provided orange light emitting carbon nano dot can be used to prepare fluorescent ink, fluorescence powder, and light emitting diode (LED) giving off white light. The fluorescent ink and fluorescence powder prepared from the orange light emitting carbon nano dot both have high fluorescence radiation quantum efficiency. The fluorescence powder can be used to prepare LED giving off white light and the LED can be applied to illumination equipment.

The embodiment of the invention relates to an organic light-emitting diode, and a display and a lighting device using the same. The organic light-emitting diode uses a fluorescent emitting dopant in a blue emissive layer and phosphorescent emitting dopants in a red and green emissive layer, white light emission can be obtained at high luminous efficiency. According to one embodiment, there is provided an organic light-emitting diode (10) including an anode (12) and a cathode (17) which are arranged apart from each other, a red and green emissive layer (14a) on the anode side and a blue emissive layer (14c) on the cathode side, which are arranged to be separated from each other between the anode (12) and the cathode (17), and a spacer layer (14b) which is inserted between the red and green emissive layer (14a) and the blue emissive layer (14c).

The invention discloses a novel polymer fluorescent material which takes a Beta-dione aggregative structure as a fluorescent luminophor and can be prepared through emulsion polymerization, solution polymerization and body polymerization. The luminous material can be a polymer emulsion or aggregative state solid and film. The invention is characterized in that a polymer is successfully dispersed in a water medium by adopting a novel emulsion polymerization technology to form nano-grade emulsion particles and the polymer forms a Beta-dione aggregative luminous fluorescent structure in a nano limit space. The Beta-dione aggregative luminous fluorescent structure acts with substances of an amine group to form a fluorescent composite so that the polymer emulsion has remarkably enhanced fluorescence and emits strong macroscopic fluorescence under UV light. When the polymer forms an aggregative state solid or film, the Beta-dione aggregative structure emits fluorescence which can be further enhanced by the substance containing the amine group. The material has no toxicity or nocuity and environment protection.