63results about How to "Efficient light emitting" patented technology

Provided are: a composite wavelength conversion powder which has high utilization efficiency of light and high utilization efficiency of a constituent material, and which is capable of achieving a good balance between highly efficient light emission and high reliability; and a resin composition which contains this composite wavelength conversion powder. This composite wavelength conversion powder is obtained by dispersing phosphor particles having a refractive index of 1.6 or more in a matrix particle which contains fine magnesium fluoride particles or fine calcium fluoride particles. Also provided is a light emitting device which is capable of improving the utilization efficiency of light produced by phosphor particles that are excited by primary irradiation light irradiated from a light emitting element, and which is capable of improving the optical output of light emission by increasing the amount of secondary irradiation light produced by the phosphor particles, while suppressing the occurrence of color unevenness or color variation of the light discharged to the outside of the device. A light emitting device (1) of the present invention is provided with a substrate (2), a light emitting element (3) that is mounted on the surface of the substrate (2), and a light transmitting member (4) that covers the light emitting element (3). This light transmitting member (4) contains composite wavelength conversion particles (12) which are composed of phosphor particles that have an average particle diameter of 500 nm or less and inorganic particles that are transparent to visible light and have an average particle diameter of 500 nm or less.

The invention relates to a multiphase fluorescent ceramic and a preparation method thereof. The multiphase fluorescent ceramic comprises a high-thermal-conductivity dielectric ceramic matrix and fluorescent ceramic main bodies which are distributed in the high-thermal-conductivity dielectric ceramic matrix and are periodically arranged; the shortest distance L between the adjacent fluorescent ceramic main bodies is 200-1000 microns, and the volume fraction delta of the high-thermal-conductivity dielectric ceramic matrix in the multiphase fluorescent ceramic is 5-60%; the fluorescent ceramic main body is rare earth doped transparent ceramic; and the material of the high-thermal-conductivity dielectric ceramic matrix is selected from at least one of Al2O3, AlN, BeO, Sc2O3, Si3N4, BN, SiC andMgO.

An electro-fluorescence component containing luminous material with silicon based rare-earth-doped consists of a p - type or n - type silicon substrate , a doping layer formed by injecting ion silica grown on silicon substrate and used as active region of luminous component , a n - type or p - type poly-silicon layer formed on doping layer , a silica isolation layer grown on doping and poly-silicon layer , an electrode on n - type or p - type poly-silicon layer , another electrode on p - type or n - type silicon substrate and an opening for light outgoing on silica isolation layer surface .

The invention relates to a photoelectric whiteboard signal reception device used in a photoelectric whiteboard system to realize the automatic calibration of coordinates. The signal reception device comprises light-pen tracking cameras, a processing circuit and an interface circuit and further comprises a calibration camera for collecting images of a display screen and analyzing the coordinates of reference points. The light path of the light-pen tracking camera comprises an optical filter through which the infrared light or the ultraviolet light penetrates exclusively. The two cameras are faced to the same direction and both connected with the processing circuit. During the operation, a light-pen is used, which can emit the infrared light or the ultraviolet light relative to the optical filter. The photoelectric whiteboard system with the inventive photoelectric whiteboard signal receiver can automatically calibrate coordinates without the interference of visible lights.

The invention belongs to the technical field of luminescence and display, relating to a red luminous material in a novel rare earth phosphor luminous material for converting a purple light emitting diode (LED) to a white LED. The structure formula of the red luminous material is M[3-a-b-c]NSi2O8:Ra.Sb.Tc, when M is metal element Ba, N is metal element Mg, R is transition metal element Mn, S is rare earth element Eu and T is rare earth element Tb, MnCl2.4H2O is an activating agent and a fluxing agent in the reaction, thus reducing the reaction temperature, shortening the reaction time, lowering phonon energy in substrate lattice and improving the luminous efficiency. The preparation method comprises the following steps: weighting the materials with the structure formula by weight percent, evenly grinding, placing and calcining the ground material in a high-temperature furnace, cooling, porphyrizing, calcining at high temperature again, and porphyrizing again after cooling, thus obtaining the product. The red luminous material is mixed with a silicate rare earth luminous material capable of emitting blue light and green light in proportion to be coated on the core of the purple LED so as to emit white light.

The invention relates to a method for preparing a two-dimensional material by stripping a layered material with oxide semiconductor nano-powder. The method comprises the following steps: adsorbing p-type semiconductor nano-particles containing oxygen vacancies (oxygen holes) on the surface of the layered material while reactively adsorbing the semiconductor nano-particles on the surface of the layered material, and carrying out grinding in a grinder to realize inter-layer separation, carrying out stripping to prepare the two-dimensional material which is an intermediate film formed by compounding a single-layer or few-layer atom or molecular layer two-dimensional material and nanoparticles. and then separating the nanoparticles from the two-dimensional film to obtain the two-dimensional material. According to the technology, two types of practical products can be obtained, one type is an intermediate film formed by compounding a single-layer or few-layer atom or molecular layer two-dimensional material and nanoparticles; the other type is a two-dimensional material, and the two types of materials have wide and special applications.

The invention relates to the technical field of liquid crystal materials, and especially relates to a luminescent liquid crystal material having an AIE (aggregation-induced emission) performance, anda preparation method and an application thereof. The structural formula of the liquid crystal material is shown in the description; and in the formula, R1, R2, R3 and R4 are respectively independentlyselected from hydrogen, and aliphatic or aromatic functional groups. The liquid crystal material comprises a core structure having the AIE performance, is heated to thaw and then is cooled to a certain temperature in order to form an ordered liquid crystal phase, and the core structure having the AIE property still can efficiently emit lights after forming the liquid crystal phase aggregation, sothe problem of luminescence weakening caused by aggregation of the luminescent liquid crystal phase in the prior art is solved.

A semiconductor light-emitting device of the prsent invention forms a semiconductor multilayer portion(6) by stacking an n-type gallium nitride compound semiconductor layer(3) and a p-type gallium nitride compound semiconductor layer(5) so as to form a light-emitting portion, and a light-transmitting conductive layer(7) is formed on a surface of the semiconductor multilayer portion. A part of the light-transmitting conductive layer is removed, and an upper electrode(8) is so formed to be in contact with the exposed surface of the semiconductor multilayer portion and the light-transmitting conductive layer. By providing the surface of the semiconductor multilayer portion which is exposed through an opening(7a) of the light-transmitting conductive layer with a current blocking means(10), current is significantly prevented from flowing into a part under the upper electrode while securing good adhesion between the upper electrode and the surface of the semiconductor multilayer portion. Consequently, there can be obtained a semiconductor light-emitting device using a gallium nitride compound wherein the external quantum efficiency is improved by suppressing light emission under the upper electrode while enhancing adhesion between the upper electrode and the semiconductor layer.

It is an object of the present invention to obtain an organometallic complex that is capable of converting an excited triplet state into luminescence, a light-emitting element that can be driven for a long time, is high in luminous efficiency, and has a favorable long lifetime, and a light-emitting device using the light-emitting element. The present invention provides a light-emitting element that has a pair of electrodes (an anode and a cathode) and a light-emitting layer between a pair of electrodes, where the light-emitting layer includes an organometallic complex represented by the following general formula (5) and one of a compound that has a larger energy gap than the organometallic complex and a compound that has a larger ionization potential and a smaller electron affinity than the organometallic complex, and provides a light-emitting device using the light-emitting device.

The invention relates to a simplified process for preparing CdTe-containing nanocrystalline / polymeric composite material which comprise, conducting surface finish to water-soluble CdTe semiconductor nanocrystalline by the amphipathic copolymer containing quaternary ammonium salt, transferring into organic phase so as to obtain compound of nanocrystalline and polymer, thus the semiconductor nanocrystalline / polymer composite material containing high luminous efficiency CdTe is prepared. The preparation process comprises five steps of preparing water-soluble CdTe semiconductor nanocrystalline, synthesis of polymeric surfactant, copolymerization of polymeric surfactant with phenylethene, phase transition of nanocrystalline, and forming of the composite material.

The invention discloses a kind of functionalized pyridine carboxylic acid bidentate anion auxiliary ligand based on oxadiazole or triarylated amine and its metal iridium complex, as well as its application in electroluminescent devices. Compared with the disclosed 2- pyridine carboxylic acid and beta-diketone auxiliary ligands, the functionalized pyridine carboxylic acid can improve carrier transmission, capture ability and dispersibility in the main material of the dual-ring metal iridium complex through introduction of oxadiazole and triarylated amine. Therefore, luminescent properties of the ring metal iridium complexes based on the functionalized pyridine carboxylic acid auxiliary ligand are higher than that based on traditional 2-pyridine carboxylic acid auxiliary ligand. It is shown that the functionalized pyridine carboxylic acid may replace the traditional 2- pyridine carboxylic acid and beta-diketone as the auxiliary ligand, and is widely used to synthesize the red, green and blue three-color dual-ring metal iridium complexes electrophosphorescent materials with improved luminescent properties.

The invention discloses a solution-processed fluorescent and phosphorescent binary composite white-light organic light-emitting diode device and a preparation method thereof. A light-emitting layer inthe light-emitting diode is formed by processing a mixed solution of a thermally-activated delayed fluorescence host material and a dual-core ring metal platinum (III) complex phosphorescent guest material. Through the thermally-activated delayed fluorescence sensitized phosphorescence technology, and meanwhile, by utilizing efficient light emission and controllable Forsterer energy transfer between the host and the guest, synergistic luminescence of the wide-spectrum dual-core ring metal platinum (III) complex phosphorescent material and the blue thermally-activated delayed fluorescence material is realized, and the fluorescent and phosphorescent binary composite white-light organic light-emitting diode device with efficient luminescence and high color rendering index and color temperature is obtained. The external quantum efficiency, current efficiency and power efficiency of the device reach 11.9%, 30.8cd / A, and 21.93lm / W respectively.

The invention discloses an ionic type cyclometalated iridium complex liquid crystal luminescent material and an application thereof. The cyclometalated iridium complex liquid crystal luminescent material adopts phenylpyridine as an anionic ligand and a bipyridyl derivative as an N N ligand; the cyclometalated iridium complex liquid crystal luminescent material adopts a non-planar structure built with a cyclometalated iridium complex as a luminescent core and a biphenyl derivative as a liquid crystal unit. The cyclometalated iridium complex is taken as the luminescent layer, and the non-doped polarizing red electroluminescent device with the single luminescent layer and the polarization ratio being 4 is obtained with a rubbing alignment method.

The invention provides an ultrasonic preparation method of blue-light inorganic bromine-lead-cesium perovskite nanoparticles. The method comprises the following steps: S1, dissolving cesium acetate and lead acetate in a compound of oleic acid, oleylamine and octadecene by ultrasonic treatment to obtain a precursor solution; s2, adding benzoyl bromide into the precursor solution, and carrying out ultrasonic treatment for reaction; and S3, carrying out an ice-bath quenching reaction, adding ethyl acetate, and carrying out centrifugal separation to obtain the bromine-lead-cesium perovskite nanoparticles. The efficient luminous blue light CsPbBr3 nanoparticles are prepared through a simple and convenient ultrasonic synthesis method, and the method has the characteristics that the method is simple, large-scale preparation can be realized, the particle uniformity is good, the optical performance is excellent, and the like.

The invention discloses an LED (Light-Emitting Diode) energy-saving lamp, which is formed by connecting a lamp head, a lamp holder and a light-emitting body from top to bottom. The light-emitting body comprises a metal column body which has heat conduction and is provided with a polygonal section, an aluminum substrate distributed with an LED light source, and a fixing plate for mounting the metal column body on the lamp holder; the aluminum substrate is in a long strip shape and is adapted with the shape of any outer side face of the metal column body; two ends of the aluminum substrate are fastened on the outer side face of the metal column body through a screwing manner; the metal column body is fixedly arranged on the fixing plate through the screwing manner; the metal column body is in a hollow structure; the fixing plate is provided with an air ventilating hole and the lamp holder is integrally provided with a heat radiation through hole; and the hollow structure, the air ventilating hole and the heat radiation through hole are communicated. The column body is made of heat-conducting metal; the aluminum substrate and the metal column body are fixed through the screwing manner, and the metal column body and the fixing plate are fixed through the screwing manner, so that the heat is rapidly transmitted to the whole metal column body and the fixing plate. The hollow structure, the air ventilating hole and the heat radiation through hole are communicated with one another, so that the heat can be radiated in time through the flowing of the air.

A first light-emitting layer of a first organic electroluminescent element is disposed in common to a second organic electroluminescent element, a second light-emitting layer of the second organic electroluminescent element is disposed in contact with the first light-emitting layer and in the cathode side, and the second light-emitting layer is a light-emitting layer having an electron trapping property.

There are provided a compound represented by the general formula (1) and an organic light-emitting device which comprises the compound and has an optical output with remarkably high efficiency and high luminance.

The invention discloses a mono-doped-enriched core-shell structure up-conversion luminescent material and a preparation method thereof. A chemical expression formula of the material is NaLnF4:A3+@NaYbF4@NaLnF4. The preparation method includes following steps: step 1, synthesizing a NaLnF4:A3+ core nanomaterial; step 2, epitaxially growing a NaYbF4 layer around the NaLnF4:A3+ core nanomaterial to obain a NaLnF4:A+@NaYbF4 core-shell nanomaterial; step 3, epitaxially growing a NaLnF4 layer around the NaLnF4:A3+@NaYbF4 core-shell nanomaterial to obtain NaLnF4:A3+@NaYbF4@NaLnF4. The NaLnF4:A3+@NaYbF4@NaLnF4 core-shell structure can effectively solve the problem of co-doping concentration limitation of intracell energy transfer, can effectively realize efficient light emitting of the up-conversion luminescent material, is found conducive to luminescence of three-photo transition emission especially under a Yb-enriched sensitized shell layer and realizes two-magnitude-order enhancement of 407nm wavelength.

The invention discloses a boron-containing compound with a structure as shown in a formula (I). Boron atoms have empty P orbits, can interact with pi electron cloud of peripheral aryl and further display good luminescent properties. The boron-containing compound has the luminescent properties of TADF (thermally activated delayed fluorescence), the TADF properties of molecules are regulated by molecular structure optimization, so that the molecules acquire small delta EST (expressed sequence tags), efficient anti-intersystem crossing of exciters from T1 to S1 can be realized, and internal quantum efficiency approximate to 100% is realized. Besides, by the aid of molecular design of weak D-A structures, intramolecular charge transfer of D-A structure molecules is effectively inhibited, and narrow luminescent spectra are acquired while efficient luminescence is realized. The invention further discloses an organic light-emitting device, and at least one functional layer contains the boron-containing compound.

The invention discloses an electrodeless lamp amalgam pipe comprising an electrodeless lamp body connected with the amalgam pipe; a capillary glass tube is arranged in the amalgam pipe, and filled with the amalgam; the electrodeless lamp amalgam pipe is simple in structure, simple in technology, strong in practicality, suitable for mass production, and has excellent anti backflow means for amalgam of ball electrodeless lamp or U type electrodeless lamp; the capillary glass tube is arranged in the amalgam pipe, one end of the capillary glass tube is sealed, so the heated and fused amalgam can hardly flow to the lamp pipe, thus protecting the lamp pipe, and preventing resource waste.

The invention discloses a mono-doped-enriched core-shell structure up-conversion luminescent material and a preparation method thereof. A chemical expression formula of the material is NaLnF4:A3+@NaYbF4@NaLnF4. The preparation method includes following steps: step 1, synthesizing a NaLnF4:A3+ core nanomaterial; step 2, epitaxially growing a NaYbF4 layer around the NaLnF4:A3+ core nanomaterial to obain a NaLnF4:A+@NaYbF4 core-shell nanomaterial; step 3, epitaxially growing a NaLnF4 layer around the NaLnF4:A3+@NaYbF4 core-shell nanomaterial to obtain NaLnF4:A3+@NaYbF4@NaLnF4. The NaLnF4:A3+@NaYbF4@NaLnF4 core-shell structure can effectively solve the problem of co-doping concentration limitation of intracell energy transfer, can effectively realize efficient light emitting of the up-conversion luminescent material, is found conducive to luminescence of three-photo transition emission especially under a Yb-enriched sensitized shell layer and realizes two-magnitude-order enhancement of 407nm wavelength.

An organic electroluminescent device disclosed in the invention comprises a reflective electrode layer, a light emitting layer and a transmission electrode layer, wherein the reflective electrode layer comprises a reflective metal layer, a microcavity is formed between the reflective metal layer and the transmission electrode layer, and the distance d between the light emitting layer and the reflection metal layer conforms to the following formula I: [{(2m +1) / 4}- (1 / 8)]Lambda(Etad([ {(2m+1) / 4} + (1 / 8)]Lambda. Fabry-Perot microcavity enhances is formed between that reflective metal layer and the transmissive electrode layer. the selectivity of the light emitted by the device with Lambda wavelength, and improves the light extraction efficiency of the device. The resonance wave is generatedby the light wave in the micro cavity. By setting the distance between the light emitting layer and the reflecting metal layer with formula I, the light emitting layer is located at the wavefront position of the resonance wave, which effectively improves the luminous intensity of the device and further realizes the high-efficiency luminescence of the device.

The present invention provides a host material and an organic light-emitting device comprising the same. The host material comprises at least one first host compound and at least one second host compound, wherein the first host compound is represented by the following Formula 1 and the second host compound is represented by the following Formula 2. The organic light-emitting device of the present invention has excellent luminous efficiency and lifespan.

To restrain increase in tube temperature of an electric discharge tube when increasing tube current or the number of discharge tubes of a cold cathode fluorescence lamp apparatus.This cold cathode fluorescence lamp apparatus is provided with a holder 1 formed with a material of high heat radiation ability, a discharge tube 2 having both ends 3 supported by the holder 1, and a thermal-conductive bracket 5 fixed to a middle part 4 extending between the discharge tube 2 and both the end parts 3 and closely attached to the holder 1. Heat generated from the discharge tube 2 is discharged outside through the bracket 5 and the holder 1 thermally connected to the bracket 5 to prevent temperature increase of the discharge tube 2.

The invention relates to ring metal platinum complexes electro phosphorescence material containing tri-fragrant amine function group. Its manufacturing includes the following steps: linkage of pyridine heterocyclic compound and tri-fragrant amine to form CN bi-tooth ligand; further reacting with platinum ion and OO anion auxiliary ligand to gain the new type single ring metal platinum complexes electro phosphorescence material. The invention mixes ring metal platinum complexes with PFO and PVK to form polymer electro phosphorescence device. It can adjudge electronic structure, hole-injection, and transmission performance to renovate electroluminescence of the device. The invention can be applied to organic electroluminescence field, especially used to manufacture high performance organic electroluminescence device.

The invention discloses a high-power LED lamp low in cost and capable of easily radiating heat. The high-power LED lamp comprises a lamp holder easy to ventilate, a driving power source accommodated in the lamp holder, a plastic lamp frame of a birdcage-shaped structure and easy to ventilate, a plurality of LED lamp bars and a lamp bar connecting plate easy to ventilate; the wide end of the plastic lamp frame is fixedly connected with the top end of the lamp holder; the plastic lamp frame is provided with a plurality of longitudinal mounting grooves uniformly distributed in a circumferential direction at intervals; each of the LED lamp bars are embedded in one of the longitudinal mounting grooves, and LED beads or LED chips of the LED lamp bars are exposed on the outer surface of the plastic lamp frame and are in direct contact with outside air; the lamp bar connecting plate is fixedly connected with the narrow end of the plastic lamp frame; two electrodes of the LED lamp bars are in snap connection to the outer edge of the lamp bar connecting plate; an output line of the driving power source and the two electrodes of the LED lamp bars are respectively and electrically connected with the lamp bar connecting plate; and the lamp holder, the plastic lamp frame, the lamp bar connecting plate generate air convection so as to generate a smokestack heat radiation effect. The high-power LED lamp has the advantages of light weight, small size, low cost and good heat radiation effect.