High voltage pulse circuit

Field-emissive cathode X ray tube

The invention is concerned with the X-ray tube electron source (cathode) structural design of the field emission cathode X-ray tube, which is the type of source with no heating request. It includes: the field emission cathode sheet (-), the modulation grid sheet (-), the highlights electrode films (-), the extremely high-voltage anode target sheet (-), the electrodes connect each sheets, and the carbon Nano-tube electrode emission layer (-) attaches with the field emission cathode sheet; the modulated voltage of the grid controls the on/off of the X-ray line source, and anode to cathode voltage and the grid voltage controls its strength, highlights voltage controls the emission of the electron beam. The invention is with the miniaturization design, smaller X-ray tube with high resolution.

Method of self-organized growth of uniform and ordered semiconductor quantum lattice

The invention includes steps: (1) depositing a layer of dielectric film in thickness less than 50nm on surface of semiconductor substrate; (2) isolated unit array is made from dielectric film by using photo etching and corroding method, each unit is in circularity or square, perimeter is less than 360nm, and dielectric film between adjacent units after corroding procedure is as partition wall with its thickness less than 80nm; (3) developing quanta point in each isolated unit; (4) removing partition wall. The invention controls positioned size of quanta point, prevent inconsistency of quanta point size.

Data-driven method and circuit structure of field emission display

The invention discloses a data-driven method of a field emission display. The method comprises the following steps: static high voltage Va is applied on the positive electrode, line-scanning voltage Vg is applied on the gate electrode; when Vg is positive voltage, the scanned line is selected, when the Vg is zero, the scanned line is out-of-work; a high resistance resistor is added between the negative electrode and the ground wire, wherein the negative electrode has two connection states; and when the negative electrode is directly connected with the ground wire, pixels are in a luminescent state; and when the negative electrode is connected with the ground through a high resistance resistor, the field emission ends and pixels are in nonluminous state. The invention also discloses a circuit structure of the field emission display. In the method of the invention, the high resistance resistor is added after the negative electrode to stop field emission, a simple field-effect transistor is ...

Method for removing sapphire substrate on blue-light luminescent chip

A method of removing blue-ray light-emitting chip sapphire substrate takes the reaction of sodium hydroxide solution or other alkaline solution with the sapphire to corrode the sapphire substrate, then the light-emitting chip without the sapphire substrate or with the sapphire substrate greatly reduced can be obtained after being cleansed by de-ionized water. The technique steps can be shown in details below: firstly, the sodium hydroxide solution or other alkaline solution is poured into a container with a flat bottom, and the height of the solution is controlled below 100 microns, the mass percent concentration of the solution is between 1 percent and 40 percent; secondly, the chip with the sapphire substrate is arranged in the sodium hydroxide solution or other alkaline solution, thereby letting the sapphire substrate partially immerged into the solution for 12 to 24 hours, then the sapphire substrate is corroded away completely or in part; thirdly, the de-ionized water gets utilized ...

Method of utilizing powdered metallurgical process for prepn. of nanotube field emitting cold cathode

The method include steps: (1) mixing metal powder and nano carbon tubes, grinding the admixture till particle diameter less than 0.5 micro; (2) pressing the admixture to form of cathode; (3) agglomeration in vacuum sintering furnace in vacuum degree higher than 1X10-2Pa, temp 300-2000 deg.C for 0.5-10 hours; (4) removing a layer of metal on surface to make nano carbon tubes be stood out. Ratio between metal powder and nano carbon tubes is from 2:1to 15:1. Advantages are: raising adhesive force, anti bombarding capability and prolong service life of cathode.

Surface electronic field emission tripolar construction and production method thereof

A surface electron field emission triode structure and preparation method thereof including: a.) adopting printing, sintering, or coating, photolithography, or coating, sintering method to prepare data electrode on the cathode glass substrate, b.) adopting a plane printing or coating method for preparing a plane dielectric layer on the data electrode, and then obtain a straight hole array penetrating the plane dielectric layer by the exposure and corrosion process, c.) printing, sintering, or coating, photolithography on the plane dielectric layer, d). using spraying, coating, spreading or printing method to prepare an electron scattering material layer between the sweeping electrode and the connecting electrode, e.) using spraying, coating, spreading or printing method to prepare a nanometer conductive granular layer on the electron scattering material layer, and ensuring no appearance of short circuit between the line-scan electrodes and connect electrodes, f.) preparing a support body ...

Cathode structure of back grid field emitting display and preparing method thereof

Method and device thereof for measuring external quantum efficiency of light switching film used for photovoltaic cell

The invention relates to a measuring device which comprises an integrating sphere (1), a convex lens (6) and an excitation light source (7) successively arranged on an optical rail (11). A sample hole (4) used for placing a light switching film or a standard white plate is arranged on the integrating sphere (1), a detecting hole (12) is arranged in the integrating sphere (1), and an optical fiber (13) of a spectrograph (14) is connected with the detecting hole (12). The invention also relates to a measuring method which comprises the following steps of: firstly, adjusting the position among the integrating sphere (1), the excitation light source (7) and the convex lens (6) so that excitation light converges on the standard white plate, and acquiring a light flux in the integrating sphere (1) by using the spectrograph (14); then, removing the standard white plate, and placing a white plate pasted with a light switching sample at the converging point of the excitation light; and finally, ...

Three-junction solar cell

The invention provides a solar cell which comprises a quantum well structure; the cell structure comprises from bottom to top a back electrode, a bottom cell consisting of a p-typed germanium substrate and an n-typed germanium epitaxial layer, an n-typed GaAs layer transition layer, a lower tunneling junction, a middle cell consisting of a p-typed GaAs layer, the quantum well structure and an n-typed GaAs layer, an upper tunneling junction, a top cell consisting of a p-typed GaInP layer and an n-typed GaInP layer, an anti-reflection film and an upper electrode, wherein, the quantum well structure is divided into a quantum well layer which is made by three to five clusters of semiconductor materials and a barrier layer; and the solar cell can extend the absorption spectra of the middle cell, improve the current matching among three sub-cells, and enhance the conversion efficiency of the cell.

Packaging structure for improving luminous efficiency of power LED

Heavy current field emission cathode structure

The invention discloses a heavy current field emission cathode structure. In the structure, a cathode emission area is divided into a plurality of small lattices, and cathode emission points are electrically insulated from one another. Each cathode emission point has a relatively smaller area, so high emission uniformity can be achieved. The heavy current field emission cathode structure can determine the emission current nonuniformity of the field emission cathode lattice by measuring field emission characteristics of each cathode emission point, matches corresponding current limiting resistors at each cathode mission point according to the nonuniformity, and improves the emission current uniformity of the cathode emission lattice by the current limiting resistors corresponding to the emission points so as to obtain heavy emission current.

Straight-hole channel planar field emission tripole structure

The invention is a straight-hole channel flat field emission tripolar structure and the making method thereof, relating to the triploar structure and making method of a field emission display device,where a cathode glass substrate is equipped with data electrodes which are equipped with medium layer, the medium layer is made with through channels; the medium layer is equipped with connecting electrodes and row scanning electrodes vertical to the data electrodes; the row scanning electrodes, connecting electrodes and medium layer are provided with field emission material with surface electronconductivity; the cathode glass substrate or the medium layer is equipped with supporters which support an anode glass substrate, the lower surface of the anode glass substrate is equipped with anodeelectrodes and the lower surfaces of the anode electrodes are provided with fluorescent powder layer. And this structure can reduce the device drive voltage and the making process is simple and the cost is ...

Composite field emission cathode construction and manufacturing method thereof

The invention provides a composite field emission cathode structure and a preparation method thereof. The preparation method comprises the following steps: a) preparing a cathode electrode (2) on a cathode substrate (1) by a printing or filming method; b) preparing a carbon nano tube transition layer (3) on the cathode electrode (2) by a method of screen printing; c) naturally cooling the substrate (1) and the carbon nano tube transition layer (3), and screen-printing a zinc oxide emission layer (4) on the cooled carbon nano tube transition layer (3); d) placing the field emission cathode which consists of the cathode substrate (1), the cathode electrode (2), the carbon nano tube transition layer (3) and the nanometer structure zinc oxide emission layer (4) in a welding furnace to be roasted; e) naturally cooling the field emission cathode which consists of the cathode substrate (1), the cathode electrode (2), the carbon nano tube transition layer (3) and the nanometer structure zinc oxide ...

Field-emissive cathode X ray tube

The invention is concerned with the X-ray tube electron source (cathode) structural design of the field emission cathode X-ray tube, which is the type of source with no heating request. It includes: the field emission cathode sheet (-), the modulation grid sheet (-), the highlights electrode films (-), the extremely high-voltage anode target sheet (-), the electrodes connect each sheets, and the carbon Nano-tube electrode emission layer (-) attaches with the field emission cathode sheet; the modulated voltage of the grid controls the on/off of the X-ray line source, and anode to cathode voltage and the grid voltage controls its strength, highlights voltage controls the emission of the electron beam. The invention is with the miniaturization design, smaller X-ray tube with high resolution.

Planar tripolar field emission display device and its preparing method

The invention is a flat tripolar filed emission display device and the making method thereof, being a method having features of excellent emission property, simple making process and low cost, where a cathode glass substrate is equipped with multiple data electrodes which are provided with horizontal-stripe medium layer vertical to them, and the intersections of the medium layer and the data electrodes are equipped with field emission material layer, the field emission material layer is equipped with auxiliary emission electrodes, the two ends of the medium layer is equipped with metal lead electrodes connected with the auxiliary emission electrodes, and the field emission material layer is also equipped with connecting electrodes parallel with and connected with the data electrodes; the cathode glass substrate or the medium layer is equipped with supporters which support an anode glass substrate, the lower surface of the anode glass substrate is equipped with anode electrodes and thelower ...

High voltage pulse circuit

The utility model discloses a high voltage pulse circuit, belonging to a pulse circuit, in particular to a high voltage switch circuit, which mainly comprises two groups of series-connection switches and a voltage balance circuit, wherein the two groups of switches are energized alternately to finish the pulse output and discharge of the load. The output pulse voltage amplitude can reach above 10kV, the best rising time of the pulse is 1Mus, the best falling time is 100ms. The utility model has the advantages of driving various load, low cost, short pulse rising and falling time, high repeat frequency, small volume, and adjustable pulse width and frequency.

Data-driven method and circuit structure of field emission display

The invention discloses a data-driven method of a field emission display. The method comprises the following steps: static high voltage Va is applied on the positive electrode, line-scanning voltage Vg is applied on the gate electrode; when Vg is positive voltage, the scanned line is selected, when the Vg is zero, the scanned line is out-of-work; a high resistance resistor is added between the negative electrode and the ground wire, wherein the negative electrode has two connection states; and when the negative electrode is directly connected with the ground wire, pixels are in a luminescent state; and when the negative electrode is connected with the ground through a high resistance resistor, the field emission ends and pixels are in nonluminous state. The invention also discloses a circuit structure of the field emission display. In the method of the invention, the high resistance resistor is added after the negative electrode to stop field emission, a simple field-effect transistor is ...

Triple pole structure of plane type field emission, and preparation method

Cold-cathode focusing type X ray tube

The invention relates to a cold cathode focused X-ray tube, wherein, the tube comprises a cold cathode electron source (14), a focused electrode (7), a vacuum sealed shell body (9), a ray emission window (10), a high-voltage anode target (11) and the like, and is characterized in that the tube also comprises a zinc oxide emission layer (5) attached to the cold cathode electron source (14). In the invention, based on a plane grid electrode structure, the electron source is prepared on the surface of a glass substrate (6) in a silk screen printing manner; the high-voltage anode target (11) is fixed right above the electron source; the electrode is arranged in a ceramic vacuum shell body and connected with an external power supply by electrode leads. The ceramic shell body adopts a segmented sealing method; and a metal focused electrode (7) is arranged above the cold cathode electron source (14), and insulation and sealing with ceramics are carried out to the focused electrodes. The focused ...

Array X radiographic source based on nanophase materials electronic emission

Novel supporting body structure of field sending device

The invention relates to a supporting body structure of a field sending device. An array penetrated passage (2) is prepared on a metal base plate (1), an upper array media support post (3) is arranged on the upper surface of the metal base plate (1), a lower array media support post (4) is arranged on the lower surface of the metal base plate (1), the position of the upper array media support post (3) corresponds to the position of the lower array media support post (4), the contact parts of the upper array media support post (3) and the metal base plate (1) are respectively provided with adhesive agents, the contacts of the lower array media support post (4) and the metal base plate (1) are also respectively provided with adhesive agents, and the metal base plate (1), the upper array media support post (3) and the lower array media support post (4) are formed into a whole body through high-temperature sintering by the adhesive agents. The metal base plate and supporting bodies which are ...

Transparent conductive anti-reflecting film for solar battery and preparation method thereof

The invention discloses a transparent conductive anti-reflecting film for a solar battery. A zinc oxide buffer layer and a zinc oxide film layer with a nano structure are sequentially arranged upwardly on the surface of the solar battery. The invention also discloses a preparation method of the transparent conductive de-reflecting film for the solar battery. Compared with the general film, the anti-reflection efficiency of the film with the nano structure is greatly improved, so that the improvement on the conversion efficiency of the solar battery is facilitated; meanwhile, by considering the advantages of the doped zinc oxide transparent conductive film in the aspect of collecting a current carrier, the collecting effect of a current carrier is improved and at the same time the reflection is reduced as the film simultaneously replaces the traditional metal electrode and an anti-reflecting film in the solar battery, thereby not only facilitating the improvement on the conversion efficiency ...

Method for removing sapphire substrate on blue-light luminescent chip

Cathode construction for back grid field emission display and production method thereof

A cathode structure of a back gate field emission display and its preparation method relates to the high-field emission flat-panel displays, using a new type of cathode structure to improve the resolution and brightness uniformity of the back gate field emission display elements, and to lower manufacturing costs. The preparation method includes: a.) firstly preparing a back gate electrode (2) on the cathode substrate (1); b.) preparing an insulation dielectric layer (3) on the back gate electrode (2); c.) preparing cathode electrodes (4) perpendicular to the direction of the back gate electrode (2) on the insulating dielectric layer (3); d.) preparing a whole piece of emitter layer (6) on the cathode electrodes (4) and the gap between the cathode electrodes (4), or preparing a strip emitter layer (6) parallel to the corresponding back gate electrode (2) on the cathode electrodes (4), and increasing the resistor between the cathode electrodes (4) during large area production of emitter layer ...

Localized heating chemical vapor deposition apparatus and method

The invention discloses a local heating chemical vapor deposition device and a method. The method is that a strip heater and a magnetic induction coil heater are adopted to partially and directly heat metal/non metal substrate with the property of high-temperature resistance so as to react rapidly and generate nano and film material; the device is that an insulation stent (12) is arranged at the bottom of a reaction chamber (1); a heater (2) is positioned on the insulation stent (12) and is provided with a substrate (3); two sides of the reaction chamber (1) are respectively provided with a reaction gas inlet channel (4) and a gas outlet channel (5). The method of the invention is not required to heat the whole reaction chamber, and can generate nano and film material through heating metal/non metal substrate partially and directly; in chemical gas-phase reaction chamber, the strip heater or a magnetic induction coil heater is adopted to heat substrate partially, and when the temperature ...

Packaging structure for improving luminous efficiency of power LED

A package structure for improving output efficiency of semiconductor LED: a ring groove is set on the upper surface of metal heat-dissipated plate (1); a ring circuit board (2) is set in the ring groove; a reflection cup or opening lens (3) is set in the ring circuit board (2); a light-emitting chip (5) is set on the upper surface of the metal heat-dissipated plate (1); two ends of electrode terminal wire are separately connected to the light-emitting chip (5) and the ring circuit board (2); transparent glue is filled into the reflection cup or opening lens (3). As fluorescent powder is not directly coated on surface of the light-emitting chip, but coated on the lens which keeps a certain distance from the light-emitting chip, the light reflected by the fluorescent powder can be reflect out again, and the output efficiency can be improved.

Surface electronic field emission tripolar construction and production method thereof

A surface electron field emission triode structure and preparation method thereof including: a.) adopting printing, sintering, or coating, photolithography, or coating, sintering method to prepare data electrode on the cathode glass substrate, b.) adopting a plane printing or coating method for preparing a plane dielectric layer on the data electrode, and then obtain a straight hole array penetrating the plane dielectric layer by the exposure and corrosion process, c.) printing, sintering, or coating, photolithography on the plane dielectric layer, d). using spraying, coating, spreading or printing method to prepare an electron scattering material layer between the sweeping electrode and the connecting electrode, e.) using spraying, coating, spreading or printing method to prepare a nanometer conductive granular layer on the electron scattering material layer, and ensuring no appearance of short circuit between the line-scan electrodes and connect electrodes, f.) preparing a support body ...