134results about How to "Improves bondage" patented technology

The invention relates to a base island lead frame structure and a production method thereof. The structure comprises a base island (1) and pins (2), wherein a first metal layer (4) is arranged on the front sides of the base island (1) and the pins (2); a second metal layer (5) is arranged on the rear sides of the base island (1) and the pins (2); the front sides of the pins (2) extend to the side of the base island (1) as much as possible; non-filler plastic packaging materials (3) are embedded in the peripheral regions of the pins (2), the region between the base island (1) and the pins (2) and the region between the pin (2) and the pin (2); and the non-filler plastic packaging materials (3) can connect the lower peripheral parts of the pins, the lower parts of the pins (2) and the lower part of the base island (1), as well as the lower part of the pin (2) and the lower part of the pin (2) into a whole and make the size of the back sides of the base island (1) and the pins (2) less than that of the front sides of the base island (1) and the pins (2) so as to form a structure, with a bigger upper part and a smaller lower part, of the base island and the pins. The base island lead frame structure and the production method thereof have the advantages of large restraint capacity of the plastic packaging body and the pins, reduction in cost, energy conservation and carbon reduction and reduction in waste.

The invention discloses a selective hydrogenation catalyst for gasoline and a preparation method thereof. A carrier of the catalyst is alumina modified by carbon and silicon oxide in a specific ratio; the silicon oxide is added to regulate the acid distribution of the carrier, particularly greatly improve the L acid; and the carbon is added to inhibit the hydrogenation activity of olefin through selective interaction with an olefin hydrogenation activity center, so that the selective hydrodesulfurization capacity of the catalyst is improved, the effect of the carrier on an aid of potassium isenhanced, the carrier is coordinate with an aid of phosphorus, the loss of the potassium is prevented and the stability of the catalyst is improved. The catalyst is mainly used for selective hydrodesulfurization of the gasoline, particularly hydrodesulfurization of catalytically cracked gasoline.

The invention relates to a lead frame structure of a static release ring without paddle and a production method thereof, wherein the structure comprises a static release ring (1)and a pin (2); a first metal layer (4) is arranged in front of the static release ring (1)and the pin (2) and a second metal layer (5) is arranged at the back of the static release ring (1) and the pin (2); the front side of the pin (2) extends besides the static release ring (1) possibly; the area in the periphery of the pin (2), the area between the pin (2) and the static release ring (1) and the area between the pins (2) are embedded with a plastic package (3) without stuffing; the plastic package (3) without stuffing connects the periphery below the pin, lower part of the pin (2) and lower part of the static release ring (1) and lower parts of the pins (2) into an integrated structure and makes the backside size of the static release ring (1) and the pin (2) smaller than the front side size of the static release ring (1) and the pin (1). The invention has the advantage of big binding capability of the metal pin, cost reduction, energy saving and carbon emission and wastes reduction.

The invention relates to an island expose and multi-salient-point island expose lead frame structure and a carving and plating method thereof. The island expose and multi-salient-point island expose lead frame structure comprises two groups of islands (1) and pins (2); the first group of islands are first islands (1.1), and the other group of islands are second islands (1.2), the front faces of which are set to be in a multi-salient-point structure; the front faces and the back faces of the islands (1) and the pins (2) are respectively provided with a first metal layer (4) and a second metal layer (5); plastic package material (3) containing no fillings is embedded in a region at the peripheries of the pins (2), a region between each island (1) and each pin (2), a region between each first island (1.1) and each second island (1.2) and a region between the pins (2); and the sizes of the back faces of the islands and the pins are less than those of the front faces of the islands and the pins, thereby forming an island and pin structure with a large upper part and a small lower part. The invention has the advantages that the plastic package body and the metal pin have high binding capacity.

The invention discloses an amino calcium compound fertilizer and a manufacture method thereof; a finished product is manufactured by mixing raw material, zeolite, with carbamide, monoammonium phosphate and agricultural lemery after the zeolite is crashed; then feeding the mixture into a liquid melt storage slot; adding self-produced compound amino complex compound mixture after melting, fully and uniformly stirring the mixture, using a rotary nozzle pelletizer to pelletize; dropping spherical materials after pelleting in a prilling tower, drying and cooling the spherical materials by the air in the tower, and then carrying out sieving, measuring and packaging. The technique of the invention is simple, the manufacture cost is low and the prepared amino calcium compound fertilizer has the following advantages of: stimulating the plants to grow and improving crop output; upgrading crop quality and increasing the contents of protein, vitamin and sugar; having the effect of pesticide, reducing pesticide amount and reducing pesticide remnant amount; improving soil environment and promoting fertilizer soil productivity; improving and activating the soil; adjusting the vital movements of the plants and enhancing crop resilience such as drought resistance, cold resistance and lodging resistance, etc.; besides, the fertilizing cost is low, the ratio of output to input is high and economic benefit is good.

The invention discloses high wear resistance water-borne gloss oil, comprising the following components with the contents in percent by weight: 0-25.0% of acrylic emulsion A, 25.0-45.0% of acrylic emulsion B, 15.0-60.0% of elastic emulsion, 4.0-8.0% of wax emulsion, 0.1-0.5% of defoaming agent, 0.5-1.5% of wetting agent and 0-5.0% of coalescing agent. The invention further provides a preparing method of the high wear resistance water-borne gloss oil, and mainly adopts a method of adding the materials step by step to prepare the high wear resistance water-borne gloss oil. The water-borne gloss oil prepared by adopting the method has higher wear resistance, and has the advantages of high gloss, good flexibility, fastness in drying, good anti-adhesion property and excellent online performance.

The invention discloses a multi-resonance-layer hollow-core optical fiber, which comprises an annular dielectric pipe, wherein a first type hole is formed in the central position in the annular dielectric pipe; a plurality of groups of arc-shaped dielectric layers are arranged around the first type hole, a rectangular dielectric layer is arranged on the inner side of each arc-shaped dielectric layer; a second type hole is formed between every two groups of arc-shaped dielectric layers in the same arc direction; third type holes are formed between each rectangular dielectric layer and the innerwall of the annular dielectric pipe and between each rectangular dielectric layer and the corresponding arc-shaped dielectric layer, a fourth type hole is formed between every two groups of adjacentrectangular dielectric layers, the first type hole, the second type holes, the third type holes and the fourth type holes form a low-refractive-index region, and the arc-shaped dielectric layers, therectangular dielectric layers and the annular dielectric pipe form a high-refractive-index region. The multi-resonance-layer hollow-core optical fiber has the beneficial effects that the damage threshold of the optical fiber is improved; the confinement loss of the optical fiber is reduced, and the low confinement loss features can be obtained conveniently; and high-bandwidth and low-loss opticaltransmission can be obtained in a facilitated manner.

The invention discloses a light-emitting diode epitaxial wafer and a manufacturing method thereof. The epitaxial wafer comprises a substrate, a low-temperature GaN buffer layer formed on the substrate, a GaN non-doped layer formed on the low-temperature GaN buffer layer, an N-type GaN layer formed on the GaN non-doped layer, a quantum well stress release layer formed on the N-type GaN layer, an InxGa(1-x)N / GaN active layer formed on the quantum well stress release layer, a P-type AlGaN layer formed on the InxGa(1-x)N / GaN active layer, and a P-type GaN layer formed on the P-type AlGaN layer; through the quantum well stress release layer, the crystal quality of a quantum well can be effectively improved, so that the trap layer and barrier layer interface of the quantum well is more clear and abrupt, the binding effect of the quantum well for electrons and holes is improved, and the luminous efficiency of an LED chip is improved.

A multi-axial strengthened weft knitted fabric is composed of two weft flab base stitches, two groups of warp yarns, two groups of weft yarns, a group of +45 deg oblique yarn, and a group of -45-deg oblique yarns. Its knitting method and dedicated apparatus are also disclosed.

The invention relates to a first-coating last-etching single package method for positively packaging a double-sided graphic chip. The method comprises the following technical steps: taking a metal substrate; plating a metal layer to coat the metal substrate; carrying out backside etching on the metal substrate; enveloping plastic pacing material (epoxy resin) without filler on the backside of the metal substrate; carrying out positive etching on the metal substrate; etching the positive sides of a basic island and a pin, wherein the backside sizes of the basic island and the pin are smaller than the positive sizes of the basic island and the pin to form a basic inland and pin structure with big top and small bottom; loading pieces; routing metal wires; enveloping local units by using plastic pacing material (epoxy resin) with filler on the positive side of the semi-finished product to ensure local unit areas on the positive side of the pin to expose the plastic pacing material (epoxy resin) with filler; plating metal layers on the backsides of the island and the pin and the positive side of the pin for coating; and cutting. The package structure of the chip prepared by the method of the invention does not have the problem of falling feet, and the length of the metal wires is shortened.

The invention relates to a preparation method of a lithium niobate optical waveguide device, and belongs to the technical field of optical communication. According to the invention, a new cladding structure is introduced, a micron-order lithium niobate thin film optical waveguide device is obtained through the processes of ion implantation, BCB spin coating, bonding, annealing and the like, the preparation of a ridge waveguide is facilitated in process, the transmission loss of a finally prepared optical waveguide is effectively reduced, and the constraint of light is increased. According to the invention, a BCB is selected as a bonding medium material and used as an adhesive at normal temperature, so that a lithium niobate film and a substrate can be effectively combined together, the BCBis cured after annealing and used as a waveguide cladding, the subsequent mask etching process of a lithium niobate thin film is simple and convenient, and the lithium niobate thin film is not damaged; the optical refractive index of lithium niobate is 2.2, is greater than the refractive index 1.5 of the BCB and is greater than the refractive index 1 of air, and light can be well restrained in the waveguide, so that excellent performance can be realized without proton exchange.

The invention discloses an epitaxial structure capable of effectively reducing the Droop effect of an LED. The epitaxial structure comprises a substrate, an undoped gallium nitride layer, an N-type gallium nitride layer, a multi-quantum well layer, an electron barrier layer and a P-type gallium nitride layer which are successively stacked from bottom to top, wherein the multi-quantum well layer is formed by alternatively superposing multiple barrier layers AlxGa(1-x)N and trap layers InyGa(1-y)N. According to the invention, gradual change AlGaN of Al components are taken as the barrier layers, the barrier height difference between the valence band of the electron barrier layer and the barrier layer close to the electronic barrier layer is effectively reduced, the injection efficiency of cavities is improved, at the same time, through increasing the barrier height differences between the traps and the barriers in a multi-quantum well, the binding effect on electrons is further enhanced, the electrons are effectively prevented from overflowing, the composite probability of the electrons and the cavities in the multi-quantum well is enhanced, and the luminescence efficiency of the LED is accordingly improved. Compared to the prior art, the epitaxial structure provided by the invention is relatively simple in structure and facilitates MOCVD growth. According to the invention, the epitaxial structure capable of effectively reducing the Droop effect of the LED can be widely applied to the field of LEDs.

To provide at a low cost a fabric for airbags, one of safety devices for automobiles, in which both edgecomb resistance and tear strength (factors affecting inflating properties of an airbag) are improved. Preferably, to provide a fabric for airbags which is capable of being recycled as easily as an uncoated fabric and a fabric for airbags which has self-extinguishing property. A fabric for airbags which comprises a synthetic fiber woven fabric and synthetic thermoplastic resin applied on at least one side of the synthetic fiber woven fabric, characterized in that, by applying the synthetic thermoplastic resin, both edgecomb resistance and tear strength of the synthetic fiber woven fabric become 1.3 times or more as large as respective values of the synthetic fiber woven fabric before applying the synthetic thermoplastic resin. Preferably, the fabric for airbags has low air permeability and self-extinguishing property, and is capable of being repelletized with ease.

The invention relates to a polymer blocked layer material for a lithium-sulfur battery and a preparation method thereof. The preparation method comprises the following steps: preparing 1-3mg / ml of N,N-dimethyl formamide of polyacrylonitrile, and preparing a nano-fiber precursor membrane by adopting an electrostatic spinning method; carbonizing the precursor membrane in nitrogen at 800-1000 DEG C to form a carbon nano-fiber membrane; dissolving natural polymer acacia gum in water to prepare a solution; directly dropwise adding the acacia gum onto the carbon nano-fiber membrane to form a carbonnano-fiber-acacia gum composite membrane; drying the composite membrane in vacuum at 60-80 DEG C for 16-24 hours to enable the composite membrane to have a thickness of 17-25mu m and mass of 0.18-0.36mg / cm<2>. By adopting the method, the excellent circulating performance that a lithium-sulfur battery has 94 percent volume after circulating for 250 times is realized, the 'shuttle effect' problem oflithium polysulfide can be relieved, and the battery shows excellent self-discharge resistance.

The invention relates to a preparation method of hybrid cross-linked transparent ionic conductive organic hydrogel fibers. The method comprises the following steps of extruding a mixed solution of sodium alginate and polyethylene glycol diacrylate (PEGDA) into a coagulation bath in which divalent (or trivalent) metal salt is dissolved, placing an ultraviolet light source above the coagulation bath, and initiating covalent cross-linking of the PEGDA; and finally, performing solvent replacement to obtain the organic hydrogel fibers. The prepared organic hydrogel fibers have the excellent freezing resistance, stability, transparency and stretchability, and have the great application potential in the fields of wearable anisotropic sensors, data gloves, flexible electrodes, optical fibers and the like.

The invention provides production equipment of hydrophilic moisture-conducting secondary plied porous fibers and a production method of porous fibers. In the production equipment of the hydrophilic moisture-conducting secondary plied porous fibers, a single-rod double-end two-way guider mainly features two-way guidance, so that the binding of the guider to tows is strengthened; the two tows, before being plied, are symmetrically deviated from the angular direction of the guider, the uniform tension of the two tows is ensured, the friction between the two tows before and after plying is reduced, fiber branching and breaking are avoided, and yarn drifting and broken ends are avoided, yarn skipping during winding switching is avoided, the problems, such as hairy fiber falling during cake winding, are avoided, and product quality is improved.

The invention relates to the technical field of spunlace non-weaving, and discloses a spunlace non-woven material containing natural dry petals and a preparation method thereof. The spunlace non-wovenmaterial comprises dry fiber webs and wet fiber webs which are intertwined, and the intact natural dry petals are placed between the wet fiber webs and the dry fiber webs; the natural dry petals areselected from petals which use carotenoids as main pigments and have colors from yellow to red, and the length-width ratio of the natural dry petals is smaller than 10:1. According to the spunlace non-woven material, the characteristics of dry-laid web and wet-laid web spunlace processes are fully utilized, and the whole petals with natural morphology are uniformly distributed in the spunlace non-woven material, so that the spunlace non-woven material has natural beauty care effects, the aesthetic feeling of cloth covers of personal care materials are enhanced, and the technical problems of petal colour fading, color diffusion, short product storage period and easy falling of petals during the production and use process are effectively solved through reasonable process coordination.

The invention provides a copper-based catalyst for preparing methyl glycolate at high selectivity, wherein the catalyst is prepared with a high-specific surface area material as a supporter and copperas an active component through a physical sputtering method in one step. The catalyst is used for a reaction for preparing the methyl glycolate through hydrogenation by catalyzing dimethyl oxalate, wherein the mass content of copper in the catalyst is 5-30% and the balanced being the supporter. The catalyst has the following advantages: (1) the copper is subjected to bombarding of Ar ion, so thatelectron structure of copper is varied, and the copper shows a noble metal-like property, wherein the copper on the catalyst is zero-valent stable copper, which is not liable to be oxidized, so thatthe copper can replace noble metals such as Au and Ag in the ester hydrogenation reaction; (2) the active metal, copper, has high selectivity on the methyl glycolate, so that the catalyst is free of any other additives.

The invention proposes a spatial filter based on an artificial surface plasmon. The problems of narrow working frequency band and large cycle size in the prior art are solved. The spatial filter comprises a first dielectric plate (1), a second dielectric plate (2) and multiple metal branches, wherein the first dielectric plate (1) and the second dielectric plate (2) are stacked up and down. Each dielectric plate is composed of two dielectric substrates crossing each other to produce 8 planes. Multiple metal branches are combined in two forms. In one form, the metal branches are arranged in arccosine form, partially folded and combined to form a first kind of metal branch patches (3). In the other form, the metal branches are arranged in arc cosine form, partially folded, raised and combined to form a second kind of metal branch patches (4). The first kind of metal branch patches are printed on eight planes of the first dielectric plate. The second kind of metal branch patches are printed on eight planes of the second dielectric plate. Each branch is loaded with a resistor. According to the invention, the working frequency band is broadened; the cycle size of the structure is reduced; and the spatial filter can be used for reducing the radar cross section RCS.

The invention discloses a jump layer transmission line based on artificial surface plasma polaritons. The jump layer transmission line comprises a dielectric substrate, a first metal strip and a second metal strip which are arranged at the two sides of the dielectric substrate, and a metalized through hole which penetrates through the dielectric substrate and is connected with the tail ends of the first metal strip and the second metal strip so as to connect the metal strips from one side of the dielectric substrate to the other side. The first metal strip and the second metal strip are formed by periodic slot units. Interlayer high-efficiency transmission of multiple layers in broadband bandwidth can be realized through a metal through hole technology, and the jump layer transmission line also has the characteristics of being easy to manufacture and convenient to process, and low in crosstalk and high in efficiency. The single-layer transmission line structure can be applied to a limitless thin dielectric substrate so that the characteristics of ultrathin ultralow loss transmission can be realized. Meanwhile, the two transmission lines are not sensitive to deformation of the dielectric substrate and can be attached to a spherical surface, a conical surface and other uneven dielectric substrate surfaces so as to form a conformal device and a circuit system.

The invention relates to the field of hot rolled strip steel packaging, in particular to a radial fastening device of a high-strength hot rolled strip steel coil. The radial fastening device comprises a radial fastening strip. The radial fastening strip comprises a large horizontal plate, middle connection plates, small horizontal plates and bolt holes. The large horizontal plate, the middle connection plates and the small horizontal plates are formed by cold-bending hot rolled strip steel. The middle connection plates and the small horizontal plates are each symmetrically arranged on the two sides of the large horizontal plate in a bent mode. The multiple bolt holes are formed in the small horizontal plates. Through the design of the radial fastening strip, an auxiliary storage table and an automatic transport mechanism, the degree of automation is increased, efficiency is improved, excessive manual participation is avoided, labor is saved, and the problem of casualties in the operation process is avoided.

The invention discloses an artificial surface plasmon waveguide based on a symmetrical period of a loop-shaped branch structure, and relates to an artificial surface plasmon waveguide. The waveguide comprises a dielectric substrate. A metal structure is arranged on one side of the dielectric substrate. The metal structure is provided with a coplanar waveguide feed structure, an intermediate artificial surface plasmon waveguide transmission structure and an artificial surface plasmon transition structure. The artificial surface plasmon transition structure is arranged between the coplanar waveguide feed structure and the intermediate artificial surface plasmon waveguide transmission structure. The coplanar waveguide feed structure is located at the two ends of the dielectric substrate. Theprogressive frequency is reduced, and the binding property of electromagnetic waves is enhanced. The method has important significance for reducing the size of the planar SSPP waveguide. The passbandrange can be changed by adjusting the size of the side length of a homocentric-squares-shaped branch knot. The advantages of small size, easy machining, high transmission rate and the like are achieved.

The invention relates to a toxic and harmful gas detection sensor and method, and belongs to the technical field of gas detection. The toxic and harmful gas detection sensor comprises a shell, a dielectric substrate, a sensitive dielectric film, an artificial plasmon resonator and a metal microstrip transmission band; the top of the shell is open-mouthed; the dielectric substrate is horizontally arranged and located in the shell, and the lower surface of the dielectric substrate is fixedly connected with the inner wall of the bottom end of the shell; the sensitive dielectric film is fixedly connected to the upper surface of the dielectric substrate; the artificial plasmon resonator is fixedly connected to the sensitive dielectric film; and one end of the metal microstrip transmission bandis fixedly and electrically connected with the artificial plasmon resonator, the other end of the metal microstrip transmission band penetrates the shell, and the metal microstrip transmission band isfixedly connected to the sensitive dielectric film. The gas detection sensor is small in size, low in power consumption, high in external interference resistance, easy to integrate and high in detection sensitivity.

The invention discloses a method for efficiently extracting longan seed polyphenols. The method comprises the following steps: (1) pulping and radiation treatment: mixing fresh longan seeds and deionized water, pulping, adding an organic acid solution, heating to 45-50 DEG C, and carrying out 60Co ionizing radiation treatment for 30-60 seconds to obtain a radiated pulp; (2) leaching and filtration treatment: adding a composite enzyme into the radiated pulp in a nitrogen protective atmosphere, extracting at 60-70 DEG C under reflux for 2-3 hours, filtering the leaching solution through an ultrafiltration membrane, and collecting the filtrate; (3) reduced pressure concentration and extraction treatment; and (4) adsorption and drying treatment. The ionizing radiation is matched with the organic acid solution to treat the pulp, thereby lowering the polyphenol binding capacity. The composite enzyme is added in the leaching process to break through the chemical bonds for binding the polyphenols, thereby enhancing the polyphenol product yield. The method is simple to operate, and has the advantages of high extraction efficiency and the like.

The invention relates to a lithium-sulfur battery flexible electrode material and preparation method and application thereof. The lithium-sulfur battery flexible electrode material comprises a VOx nanometer hollow sphere wound with a single-walled carbon nanotube, wherein elemental sulfur is coated in the VOx nanometer hollow sphere, and x is equal to 1.5 to 2.5. By means of an absorption effect of VOx on lithium polysulfide and a wrapping effect of a hollow sphere structure on the polysulfide, the VOx nanometer hollow sphere is combined with the single-walled carbon nanotube, the binding capability of the lithium-sulfur battery flexible electrode material on the elemental sulfur and the polysulfide is synergically improved, and the lithium-sulfur battery flexible electrode material has excellent cycle stability and high battery capacity during the charge-discharge process. The initial discharging capacity of a VOx flexible film with a diameter about 200 nanometer under 1C rate currentcan reach 1,069mAh / g or above and still can reach 614mAh / g or above under 20C rate current; the lithium-sulfur battery flexible electrode material is excellent in cycle efficiency, and the capacity still can be maintained at 69% or above after charging and discharging for 300 circles; and after the lithium-sulfur battery flexible electrode material is used as a lithium-sulfur battery positive electrode assembled to form a flexible soft package battery, the voltage stability is high under different bending angles, the cycle property is excellent under different bending angles, and the capacityreduction rate is average less than 0.32% after 20-100 circles.

The invention discloses a computer development-based intelligent decoration design system. The system is reasonable in structural design and strong in functionality. Through the system, contact tightness between users and own to-be-designed houses can be improved, and the decoration design efficiency is relatively high; users can selectively modify own design schemes in real time, so that the problems of low design quality and low design efficiency caused by poor contact between the users and decoration companies are avoided; and users can design and modify the schemes according to own requirements, so that the effectiveness is strong and the property loss caused by bad design quality of decoration staffs can be avoided. In general, the system is capable of facilitating the house decoration design of users to a great extent, has strong convenience and effectiveness, and has a broad market application prospect.

The invention discloses a paraffin hydrofining catalyst and a preparation method thereof. A carrier of the paraffin hydrofining catalyst comprises aluminum oxide, layered clay and a Y-type molecular sieve; nickel and molybdenum are taken as active metal components; taking the mass of the paraffin hydrofining catalyst as a reference, the paraffin hydrofining catalyst comprises 2.0%-35.0% of molybdenum oxide, and 0.5%-20.0% of nickel oxide; the dispersity of the active metal components is as follows: IMo / IAl is 0.15-0.30, and INi / IAl is 0.07-0.15. The paraffin hydrofining catalyst is high in active metal utilization rate, high in active metal dispersity and high in activity.

The invention provides a unit artificial surface plasma excimer transmission line based on a spiral structure. The transmission line structurally comprises two layers; the upper layer is a metal conducting belt; the lower layer is a substrate base sheet; the metal conduction belt is designed into a concave structure with a groove; an integral spiral structure is formed in a mode of spirally and internally winding a metal copper conductor on the top of the left side of the inner wall of the groove and also spirally winding the metal copper conductor in a complementary way on the top of the right side of the inner wall of the groove to be matched with the metal copper conductor extending out from the inner wall of the left side; and the metal copper conductors extending at the two sides do not intersect with each other. The unit artificial surface plasma excimer transmission line provided by the invention can realize the spiral winding of the metal conducting belt on each groove arm through a simple process; the preparation process is simple; the preparation cost is low; after the spiral metal conducting belt is optimized, the chromatic dispersion enhancement is realized; the constraint capability of the artificial surface plasma excimer transmission line on electromagnetic waves is improved; and the performance of artificial surface plasma excimers is improved.

The invention provides an LED chip and a manufacturing method thereof. The LED chip comprises a substrate, a buffer layer, an N-type layer, a multiple quantum well layer, a P-type layer and a conducting layer, wherein the buffer layer, the N-type layer, the multiple quantum well layer, the P-type layer and the conducting layer are sequentially formed on the substrate, the multiple quantum well layer is formed by alternatively stacking an InxGa(1-x)N well layer and an InaAlbGacN barrier layer, In components of the single InxGa(1-x)N well layer are grandually reduced from the lower side to the upper side, and In components of the single InaAlbGacN barrier layer are gradually increased from the lower side to the upper side. According to the LED chip, the In components of the well layer and the barrier layer are gradually changed, and the quantum well energy band is regulated so that electron and hole separation caused by a polarization field is eliminated, and the compounding efficiency of electron and hole radiation is improved, so that the performance of the LED chip is improved.