794 results about "Light conversion efficiency" patented technology

The invention discloses a display panel and a display device, capable of improving light conversion efficiency of the display panel. The display panel comprises an array substrate and a color film substrate which are oppositely arranged as well as a liquid crystal layer between the array substrate and the color film substrate, wherein a quantum dot excitation layer is arranged on the color film substrate; an upper polarizing layer is arranged between the color film substrate and the liquid crystal layer; a lower polarizing layer is arranged on one surface, not adjacent to the liquid crystal layer, of the array substrate; and through the upper polarizing layer, linearly polarized light transmitted from the lower polarizing layer can reach the quantum dot excitation layer by keeping the state of the linearly polarized light.

The invention provides a light guide structure, a backlight module and a manufacturing method thereof. The light guide structure includes a light guide plate, an optical converting element and an optical vapor barrier. The light guide plate is provided with a light receiving face. The chemical vapor barrier covers the light receiving face. The optical converting element is arranged on the light receiving face and between the light guide plate and the optical vapor barrier. The invention utilizes the optical vapor barrier to separate optical converting element and the external world, thereby preventing the optical converting element from being affected with damp. Thus, the reduction of the optical converting efficiency is decelerated.

To provide a phosphor emitting green fluorescence and having such superior characteristics as excellent conversion efficiency of blue light or near-ultraviolet light and excellent color purity,a phosphor satisfying the following conditions (i) to (v):(i) the wavelength of emission peak thereof is 510 nm or longer and 542 nm or shorter, when excited with light of 400 nm or 455 nm(ii) the full width at half maximum of emission peak thereof is 75 nm or narrower, when excited with light of 400 nm or 455 nm,(iii) the external quantum efficiency, which is defined by the formula below, is 0.42 or larger, when excited with light of 400 nm or 455 nm,(external quantum efficiency)=(internal quantum efficiency)×(absorption efficiency)(iv) a part of its surface comprises substance containing oxygen, and(v) it contains a bivalent and trivalent metal element (MII element), and its molar ratio to the total bivalent elements is larger than 1% and smaller than 15%.

The light conversion efficiency of a solar cell (10) is enhanced by using an optical downshifting layer (30) in cooperation with a photovoltaic material (22). The optical downshifting layer converts photons (50) having wavelengths in a supplemental light absorption spectrum into photons (52) having a wavelength in the primary light absorption spectrum of the photovoltaic material. The cost effectiveness and efficiency of solar cells platforms (20) can be increased by relaxing the range of the primary light absorption spectrum of the photovoltaic material. The optical downshifting layer can be applied as a low cost solution processed film composed of highly absorbing and emissive quantum dot heterostructure nanomaterial embedded in an inert matrix to improve the short wavelength response of the photovoltaic material. The enhanced efficiency provided by the optical downshifting layer permits advantageous modifications to the solar cell platform that enhances its efficiency as well.

The invention relates to a high-brightness LED underwater lamp with low energy consumption and numerically controlled light color. A groove surface of a double-sided groove type lamp housing is provided with one or more LED chips. A transparent cover is arranged on and matched with one side, where an LED is arranged, of the double-sided groove type lamp housing by a rubber sealing ring in a waterproof sealed manner. Another groove cavity of the double-sided groove type lamp housing is internally provided with a control circuit board, a signal end of which is respectively connected with signal ends of one or more LED chips. A wiring terminal is sealed and connected on a sealing cover plate and a lead of the wiring terminal is connected with the signal end of the control circuit board. The sealing cover plate is sealed and matched with the other side of the double-sided groove type lamp housing. The energy saving lamp has the advantages of firstly, not only avoiding unfavorable effect of the control circuit board on the LED chip, but also considerably improving the optical conversion efficiency of the LED chip; secondly, realizing the direct temperature reduction to the LED chip, decreasing energy consumption, improving the optical conversion efficiency of the LED chip and considerably prolonging the service life of the LED chip; and thirdly, realizing the purpose of direct water-cooled temperature reduction.

The present invention relates to a photocatalyst using a semiconductor-carbon nanomaterial core-shell composite quantum dot and a method for preparing the same, more particularly to a microparticle in which a semiconductor-carbon nanomaterial core-shell composite quantum dot is self-assembled using 4-aminophenol, capable of improving photoelectochemical response and photoconversion efficiency when used as a photocatalyst or a photoelectrode of a photoelectochemical device, a photoelectochemical device using the same and a method for preparing the same.

The invention relates to a light source structure based on fluorescent powder improving light conversion efficiency. The light source structure comprises a trigger light source (1), a triggered material (3) and a heat conducting substrate (4); the triggered material (3) is tightly attached to the heat conducting substrate (4); the light source structure further comprises a light split filter (2), particularly, the trigger light source (1) faces the light split filter (2), so that trigger rays obliquely radiate onto the light splitting filter (2); the triggered material (3) approximately faces the trigger rays guided by the light splitting filter (2); a heat conducting reflector is additionally arranged between the triggered material (3) and the heat conducting substrate (4) to improve the utilization rate of stimulated luminescence; and the heat conducting substrate (4) further can be fixed on a rotating disk (5) for optical mixing treatment. The invention can improve the light source efficiency and has the advantages of simple structure and low cost.

The present invention relates to a conductive paste for the front surface of the solar energy battery,l comprising an electric phase metal powder, a glass phase and an organic phase; the present invention is provided with zero point zero five to one percent additive on base of the total weight of the conductive paste; the additive is TiO2 powder or SnO2 powder. The front electrode of the solar energy battery adopts the conductive paste, so the present invention not only enhances the peeling mechanical intensity of the front electrode of the battery, but also enhances the filling factor FF of the battery, reduces the resistance in series and enhances the light conversion efficiency; and the present invention makes the battery have a good balance of the synthesis electric capability and the mechanical capability.

The invention discloses a wavelength conversion device and a related light emitting device thereof. The wavelength conversion device comprises a substrate, a reflecting layer and a light emitting layer which are superimposed in sequence. The light emitting layer contains a wavelength conversion material and a second binder. The reflecting layer contains reflecting particles, auxiliary particles and a first binder, wherein the reflecting particles are used for reflecting light, the auxiliary particles are used for filling the gaps of the reflecting particles, and the first binder is used for binding the reflecting particles and the auxiliary particles into a layer. The reflecting layer not only ensures high reflectivity, but also achieves small thickness. Therefore, heat generated by the light emitting layer can be better transferred to the substrate through the reflecting layer, and reduction of light conversion efficiency due to too high temperature of the light emitting layer is avoided.

The invention discloses a device and method for testing performance of blue light-emitting diode (LED) excitation fluorescent powder and relates to fluorescent powder. The invention provides a device and method for testing performance of blue LED excitation fluorescent powder based on an integrating sphere. The testing device is provided with a fixing base, an integrating sphere, a light outlet barrel, a blue LED light source, a TEC temperature control clamp, a constant current source, a cosine collector, a spectrograph, a computer, a baffle and a standard white board. An LED with the advantages of adjustable spectrum parameters and stable illumination serves as the excitation light source, the light rays reflected by the fluorescent powder are completely collected through the characteristic that the integrating sphere device is closed, a set of fluorescent powder performance measurement system with high applicability is provided, and important luminous performance indexes, such a luminous efficacy, external quantum efficiency and light conversion efficiency, of the fluorescent powder under the actual working conditions can be conveniently and accurately measured and analyzed; meanwhile, the LED excitation light source can be flexibly replaced in the system so as to meet the requirements of different fluorescent powder on different excitation light sources, and the system has good extension performance.

The invention provides a light source and a projection system applying the same. The light source comprises a solid-state light source array, a wavelength conversion device and a reshaping device, wherein the solid-state light source array consists of a plurality of solid-state light emitting devices for emitting exciting light; the wavelength conversion device is loaded with a wavelength conversion material which is used for absorbing the exciting light and generating excited light; and the reshaping device is positioned between the solid-state light source array and a color wheel and is used for carrying out reshaping processing on the exciting light emitted from the solid-state light source array so that light spots of the exciting light emitted from the solid-state light source array, which is projected to the wavelength conversion material, have specific shapes. According to the embodiment of the invention, the power density of light on the wavelength conversion material is lower, and the light conversion efficiency of the wavelength conversion material is improved.

A nanocrystal with high light absorption efficiency and a broad absorption spectrum, and a photovoltaic device comprising the nanocrystal are disclosed. The nanocrystal of the present invention comprises a core, a first shell grown and formed on the surface of the core, and a second shell grown and formed on the surface of the core or the surface of the first shell. Besides, the core, the first shell, and the second shell are a low energy gap material, a middle energy gap material, and a high energy gap material, respectively. Therefore, the nanocrystal has a great absorption in the ultraviolet range, the visible light range, and the infrared range; and the solar spectrum can be converted effectively to improve the light conversion efficiency thereof.

The invention relates to an NPN-structure-based laser photovoltaic cell and a preparation process thereof. The photovoltaic cell comprises an N type GaAs conducting layer, a tunneling junction and a GaAs cell which are sequentially grown on a semi-insulating GaAs substrate, wherein the GaAs cell comprises a P / N junction and an N type window layer which are sequentially distributed in the direction gradually far away from the substrate. The preparation process comprises the following steps of: sequentially growing the N type conducting layer, the tunneling junction, the P / N junction, the N type window layer and an N type contact layer on the semi-insulating substrate by an epitaxial growing method to form a photovoltaic cell base body; and processing on the photovoltaic cell base body to form an isolating groove, a positive electrode, a negative electrode, an antireflection layer and an electrode lead to form the target product. The photovoltaic cell is low in series resistance, high in output voltage and high in light absorption and light conversion efficiency, can widely serve as a high-efficiency laser photovoltaic cell and is easy and convenient to prepare. The processing time of a device can be effectively saved; the cost is reduced; and the requirement of mass production is met.

The diode is comprised of the luminous chip electrode, phosphor and sealing material. The phosphor is comprised of the silicon chloride acid Mg Zn Ca (CMZSC) and alkali earth silicate and pyrosilicate phosphor. This phosphor with the other phosphor of the visible light combines the UV white light and LD. The CMZSC green phosphor can transform the blue light transmitted by the semiconductor compound into yellow light. Thus the transmitting spectrum covered area is broadened and the optical transform effect is improved.

The invention relates to a light source component, a light source system and a projection device. The light source component comprises an exciting light source, a color wheel and a light filter. The exciting light source is used to generate exciting light; first wavelength conversion material which converts the exciting light to first color light is arranged on the color wheel; and the light filter is provided with a first light filtering area which filters the first color light so as to produce second color light, wherein the difference between the dominant wavelengths of the first color light and the second color light is bigger than or equal to 3nm. According to the invention, through the manner, the first wavelength conversion material capable of converting the exciting light to the first color light cooperates with the light filter to generate the second color light, thus avoiding the use of wavelength conversion material which is relatively high in price or poor in performance and directly absorbs the exciting light to generate second color light. Therefore, the cost of the light source system is reduced and the light conversion efficiency of the light source system is improved.

A light emitting diode (LED) device having a fluorescent multilayer is provided. The LED device includes an LED chip, which emits excitation light, and a fluorescent multilayer, which is comprised of a plurality of fluorescent layers that emit different colors from one another when being excited by excitation light. Light of a longer wavelength is emitted from a portion of the fluorescent multilayer closer to the LED chip, and light of a shorter wavelength is emitted from a portion of the fluorescent multilayer farther away from the LED chip. Accordingly, it is possible to increase the entire light conversion efficiency of the LED device and the amount of light output from the LED device.

The invention provides a method for preparing a textured polycrystalline silicon wafer, which comprises the following steps of: performing alkaline corrosion on the polycrystalline silicon wafer in alkaline corrosion solution to ensure that the corrosion amount of the polycrystalline silicon wafer is 0.01 to 0.1mg / cm<2>; and performing acid corrosion on the cleaned polycrystalline silicon wafer under the acid corrosion condition to ensure that the corrosion amount of the polycrystalline silicon wafer is 0.5 to 5mg / cm<2> so as to obtain the polycrystalline silicon wafer subjected to the acid corrosion. By the method for preparing the textured polycrystalline silicon wafer, the reflectivity of the texture can be lower than 18 percent when the wavelength is between 300 and 1,100nm; meanwhile, part of damaged layers left when the polycrystalline silicon wafer is cut can be removed, so the life of a minority carrier can be prolonged to increase the optical conversion efficiency of a solar cell.

The invention provides a display panel and an optical sheet applying the same. The optical sheet comprises a substrate layer, a light shielding layer, a color light-filtering structure, a scattering layer and a first reflection layer. The light shielding layer is located on the substrate layer. Additionally, the light shielding layer has multiple openings. The color light-filtering structure is installed in at least a part of openings. Additionally, the color light-filtering structure comprises multiple quantum dots. The scattering layer is arranged between the color light-filtering structureand the first reflection layer. The first reflection layer is arranged between the color light-filtering structure and the light shielding layer. Accordingly, the likelihood of activation of the quantum dots is increased through the scattering layer and the first reflection layer. Therefore, light conversion efficiency of the display panel is improved.

The invention provides a quantum dot light-emitting device, a backlight module and a liquid crystal display device. The quantum dot light-emitting device comprises a light-emitting device body used for generating first-wavelength excitation light, a second quantum dot packaging layer used for absorbing the first-wavelength excitation light to generate second-wavelength conversion light, and a third quantum dot packaging layer used for absorbing the first-wavelength excitation light to generate third-wavelength conversion light. The second quantum dot packaging layer is located between the light-emitting device body and the third quantum dot packaging layer, and the third wavelength is smaller than the second wavelength and larger than the first wavelength so that the excitation light conversion efficiency of a quantum dot material can be improved.

The invention discloses a serially connected type perovskite / homojunction silicon laminated solar cell and a preparation method thereof. The laminated solar cell comprises an n-type homogeneous crystalline silicon solar cell serving as a bottom cell based on a PERC (passivated emitter rear contact cell) structure. A perovskite solar cell with a transparent electrode serves as a top cell. The structure of the laminated solar cell sequentially comprises a metal bottom electrode, a bottom electrode opened passivation layer, a local or all n-type heavily doped layer, n-type silicon, a p-type heavily doped emitter, an emitting electrode passivation layer, a tunneling layer, an electron transport layer, a perovskite absorption layer, a hole transport layer, a top electrode buffer layer, a transparent electrode, a metal grid line electrode and an antireflection film from bottom to top. The laminated solar cell is based on the mainstream homojunction PREC solar crystalline silicon cell in the current photovoltaic industry, and is simple in preparation process, low in preparation cost, high in light conversion efficiency and suitable for large-scale industrial production.

The invention provides a quantum dot light emitting device, a backlight module and a liquid crystal display device. The quantum dot light emitting device comprises a light emitting device, a second quantum dot encapsulation layer and a third quantum dot encapsulation layer, wherein the light emitting device is used for generating first wavelength excitation light; the second quantum dot encapsulation layer is used for absorbing first wavelength excitation light rays to generate second wavelength conversion light rays; the third quantum dot encapsulation layer is used for absorbing the first wavelength excitation light rays to generate third wavelength conversion light rays; the second quantum dot encapsulation layer is positioned between the light emitting device and the third quantum dot encapsulation layer; and the third wavelength is smaller than the second wavelength but greater than the first wavelength, so that the excitation light conversion efficiency of a quantum dot material is improved.

The invention discloses a preparation art, which belongs to the preparation art of photo-hydrolysis nanometer electrode. Particularly, the invention relates to a preparation method, which utilizes solar energy for water decomposition and production of hydrogen nanometer electrode. The invention uses the synthetic titanium oxide nanometer microspheres and other semiconductor materials, such as zinc oxide , to construct lamellar nanometer electrode. The application of lamellar doping method accelerates an efficient separation of electron and cavity, the titanium oxide nanometer microsphere structure increases contact area of the electrode surface and the electrolyte, the material is provided with high light conversion efficiency and photolysis efficiency, which improve the photo-hydrolysis efficiency. The preparation method has a simple manufacturing process, which decreases the manufacturing difficulty of semiconductor nanometer composite material and simplifies the implementation process of the electrode. Thus, the invention has a potential application value.

A poultry raising system includes a poultry house and facilities attached to the poultry house. The facilities include lighting facilities irradiating poultry with light; and the lighting facilities include a semiconductor light source, for irradiation with light having peak wavelength in the range of 550 to 650 nm emitted from the semiconductor light source. The light in this wavelength range has positive influence on sexual maturation, appetite, need for sleep and condition of internal organs. Light of shorter peak wavelength includes ultraviolet rays that cause stress on the poultry and attract insects. Light of longer wavelength includes infrared rays that increase temperature of the poultry and of the poultry house. It is possible to emit light having peak wavelength in a specific range effective to growth and fattening. Because of high electricity-to-light conversion efficiency, high economic efficiency can be attained, and CO2 emission can be reduced. Risk of shattering of a globe by abrupt cooling can be reduced, and temperature increase in the poultry house can be prevented. Longer life reduces danger, labor and cost of exchange. Thus, meat and egg yield can be increased and economical efficiency can be improved.

The invention discloses a cleaning process method of crystal silicon slice. The cleaning process method of the crystal silicon slice includes the following steps: 1, conducting acid corrosion processing on silicon slice; 2, cleaning the silicon slice which is conducted acid corrosion through pure water; 3, placing the silicon slice in tetramethylammonium hydroxide (TMAH) solution with the temperature of 60-80 DEG C and volume concentration of 10 to 20 percent to conduct caustic corrosion processing for 1.5 to 3 minutes; 4, cleaning the silicon slice which is conducted caustic corrosion process by pure water; 5, then flowing and soaking the silicon slice in hydrogen fluoride (HF) mixed solution with volume concentration of 5 to 15 percent and conducting effective removal on oxide on the surface of the silicon slice; 6, cleaning the silicon slice which is cleaned by acid by pure water; and 7, conducting drying processing on the processed silicon slice. The cleaning process method of the crystal silicon slice not only can retain the original functions of back corrosion and PSG removal, but also adds a back polishing function, greatly improves light conversion efficiency of the silicon slice, and meanwhile reduces production cost.

The invention relates to a phosphorus diffusion technology of solar cell silicon wafer. The technology comprises firstly pre-depositing a thin and uniform P2O5 in changing temperatures (750 to 800 DEG C); and then performing a promoted two-step diffusing method in changing temperatures (800 to 850 DEG C). The low-temperature deposition can reduce concentration on the surface of the silicon wafer, decrease dead layer and lower dark current, and can reduce heat damage and heat defect under low temperature conditions in a relatively good way. According to invention, the technology has an open-circuit voltage (Uoc) higher than that of conventional technology. At the same time, the high temperature difference (50 to 80 DEG C) promotion can further improve P activity, and enables generation of more carriers, formation of relatively high-quality PN junctions, and great improvement of Uoc and Isc, thereby improving light conversion efficiency of cells.

The invention provides an annular-spot chip amplifier. By the annular-spot chip amplifier, annular laser beams, with high beam quality and low power, obtained by the aid of an unstable cavity can pass through different aperture areas of a same chip gain medium or chip gain medium sequence conveniently and repeatedly in different beam sizes, equal-flux laser extraction with high laser power density is realized, ASE (amplified spontaneous emission) is suppressed effectively, high optical to optical conversion efficiency is realized, and temperature gradient and temperature to optical distortion caused by non-uniform radial laser on a chip can be further avoided.

A light emitting diode lamp includes a lead terminal 2 formed with a cup 8 having a conical inner circumferential surface serving as a light reflective surface 8a, an LED chip 4 bonded to a bottom surface 8b of the cup with a die bonding material H, a molded portion 6 made of a transparent synthetic resin for packaging the cup of the lead terminal. The bottom surface 8b of the cup is formed with a recess 9 or a protrusion 19 to which the LED chip 4 is bonded with the die bonding material H, whereby the light conversion efficiency of the conical light reflective surface 8a is enhanced.

The invention relates to a preparation method for an inorganic-organic core-shell rare-earth (RE) polymer material, wherein core-shell RE-organic complex is a ternary RE-organic complexes LnM1 (M2R') 3R synthesized by a single substituted-benzoic acid compounds (L) and 1, 10-phenanthroline as ligand, as shown in the right figure. The said method includes: (1) preparation of organic RE complexes, (2) preparation of organic RE complexes emulsion, and (3) preparation of core-shell organic RE complexes / PMMA organic RE polymer light-conversion agent. The RE polymer composite has excellent characteristics of high optical conversion efficiency, strong fluorescence, longer fluorescence lifetime and complexes of high transparency, and can be used as a new optical materials in agriculture, biology, electrical and electronics, etc. arious fields. The preparation process is simple.

The method discloses a method for performing photoelectrolysis of water and preparing hydrogen by using a palladium quantum dot modified titanium dioxide nanotube array, relating to a method for preparing hydrogen. The method utilizes a new titanium dioxide photocathode material to perform the photoelectrocatalysis and electrolysis of water and prepare hydrogen. The method comprises the following steps: the palladium quantum dot modified titanium dioxide nanotube array is used as photocathode, the photoelectrolysis of water is performed in a three-electrode system to prepare hydrogen; the hydrothermal method is adopted to deposit palladium quantum dots on the surface of the TiO2 nanotube array, the particle size is 2.5-4nm, the particles are uniformly distributed on the outer surface of the nanotubes, the two materials are separately used as photoanode and photocathode; and in a three-electrode electrolytic cell, sodium carbonate solution is used as a system and a certain bias is applied to perform the photoelectrolysis of water and prepare hydrogen. Compared with the traditional platinum photocathode, the photocurrent and optical conversion efficiency of the palladium modified titanium dioxide nanotube array photocathode are obviously increased, the hydrogen-producing speed is high, the nanotube array photocathode has good chemical stability and low-cost and large-scale industrial applications of the photocathode can be realized.

This invention relates to a super-quick optical technology including utilizing optical non-linear conversion technology in a laser cavity to generate THz laser, and said generator utilizes a non-linear optical rectification theory to put a THz laser generator at the beam waist in the cavity to increase its laser conversion efficiency. Since a laser oscillator is used as a pump source, the THz laser generated by non-linear optical rectification has the character of wide spectrum and high repeatability.