12results about How to "Improve reflection efficiency" patented technology

The utility model belongs to the technical field of lighting devices, and particularly provides a golden yellow light emitting device which comprises a blue light emitting unit, a red light emitting unit and fluorescent glue, the fluorescent glue covers the blue light emitting unit and the red light emitting unit, and yellow fluorescent powder and / or red fluorescent powder are / is contained in the fluorescent glue. Blue light emitted by the blue light emitting unit can excite yellow fluorescent powder in the fluorescent glue to generate yellow light, and then the yellow light is mixed with red light emitted by the red light emitting unit to obtain golden yellow light with the color temperature ranging from 1700 K to 2500 K. Compared with a traditional white light LED lamp, the blue light component and the color temperature can be effectively reduced, and the service life of the LED lamp is prolonged. The LED lamp improves the penetrating power of light rays under severe weather conditions such as rain, fog and dust and the road surface reflection efficiency, is particularly suitable for municipal lighting such as urban road lighting and tunnel lighting, enables a driver to see pedestrians and obstacles on the road surface more easily and clearly, and improves the driving safety coefficient.

The invention discloses a polarization multiplexing all-dielectric metasurface structure color device based on gallium phosphide. The device is composed of periodically arranged metasurface units, and each unit sequentially comprises a transparent quartz substrate 1, a TiO2 reflecting layer 2 and an all-dielectric nano resonator located on the TiO2 reflecting layer 2 from bottom to top. The nano resonator is composed of a GaP nano column 3 and a SiO2 impedance matching layer 4 covering the top of the GaP nano column 3. The material cost is low, the manufacturing process is mature, and the designed device shows obvious optical response difference under irradiation of different polarized lights. By utilizing the characteristics of high refractive index and low loss of a gallium phosphide material in a medium-long wave region of visible light, a single reflection peak of which the reflection efficiency is up to 99% and the bandwidth is less than 16nm is realized under X polarization of a visible light wave band; and a stable multi-peak spectrum is formed under Y polarization to serve as a spectrum fingerprint, so that high-quality display and polarization multiplexing functions are realized in the same device. The device is suitable for the fields of high-color-gamut display, optical anti-counterfeiting and the like.

This invention discloses a high-strength passive daytime radiation cooling film and its preparation method, belonging to the field of functional polymer materials and thermal management technology. The film has a bilayer composite structure, including an upper reflective layer and a lower emitting layer. This invention employs an integrated process of melt blending-lamination-biaxial stretching-induced phase separation-extraction pore-fixing. Through a process design of stretching followed by extraction and a hierarchical biaxial stretching strategy, it achieves highly oriented molecular chains to enhance mechanical properties while precisely constructing a multi-level structure with both nanopores and micropores. The resulting film exhibits an average reflectivity >93% in the solar radiation band (0.25–2.5 μm), an average emissivity >95% in the atmospheric window (8–14 μm), a thermal conductivity <0.1 W / (m·K), and a tensile strength >30 MPa. This invention solves the technical bottleneck of achieving high reflectivity, high emissivity, low thermal conductivity, and high strength simultaneously in radiation cooling materials, and can be widely applied in building energy conservation, outdoor equipment thermal management, and electronic device heat dissipation.

The invention discloses a flip LED chip capable of improving brightness and a preparation method thereof, a transparent conductive layer is prepared and generated on a P-GaN layer, a first insulating layer and a second insulating layer are sequentially deposited on the transparent conductive layer, and the second insulating layer covers the surface of the LED chip with the prepared transparent conductive layer; performing etching at positions, corresponding to the P-GaN layer, of the first insulating layer and the second insulating layer according to a preset interval to generate conductive holes communicated with the P-GaN layer, and performing etching at positions, corresponding to the N-GaN layer, of the first insulating layer and the second insulating layer to expose the N-GaN layer; a metal layer is formed on the outer surface of the second insulating layer through evaporation, the conductive hole is filled with the metal layer to form a contact interface with the P-GaN layer, and the metal layer extends to the exposed area of the N-GaN layer and covers at least part of the surface of the N-GaN layer; and depositing and forming a third insulating layer and a fourth insulating layer which are sequentially stacked on the metal layer. According to the invention, the overall brightness and reliability of the flip LED chip are improved under the condition that the forward voltage is not obviously increased.

The present invention relates to an LED package including a bump in a window substrate, and a method for manufacturing the same, the LED package including: an LED chip having a light emitting portion for diffusing a light source on one surface and a contact pad portion for electrical connection on the other surface opposite to the one surface; a substrate including a plurality of windows formed through each other at a predetermined interval, a connection pad electrically connected to the outside on a surface other than the windows, a first contact surface provided on the connection pad close to the windows, and a second contact surface on the connection pad located further away from the windows than the first contact surface, the welding ball is arranged on the second contact surface, the LED chip is arranged in the window, the light-emitting part is exposed towards the other surface, and the first contact surface and the contact pad part are bonded through a conductive wire; and a fluorescent molding member having a groove covering the other surface of the substrate and into which a part of the light emitting portion is inserted, and an inclined surface for expanding an illumination angle of the light source emitted by the light emitting portion.

The present disclosure provides a light emitting diode and a light emitting diode preparation method. The light emitting diode comprises a first epitaxial structure, a second epitaxial structure, a first insulating reflective layer, a connecting electrode and a second insulating reflective layer; the first epitaxial structure and the second epitaxial structure each comprise a step structure, the step structure comprising a step top surface and a step bottom surface; the first epitaxial structure and the second epitaxial structure are arranged at intervals; the first insulating reflective layer is located in an isolation groove between the first epitaxial structure and the second epitaxial structure, and one side of the surface of the first insulating reflective layer is connected to the step bottom surface of the first epitaxial structure, and the other side of the surface of the first insulating reflective layer is connected to the step top surface of the second epitaxial structure; the connecting electrode is located on the first insulating reflective layer and is electrically connected to the step bottom surface of the first epitaxial structure and the step top surface of the second epitaxial structure, respectively; and the second insulating reflective layer covers the connecting electrode, the first insulating reflective layer, the first epitaxial structure and the second epitaxial structure.

The invention provides a waste gas treatment device and method, and relates to the technical field of waste gas treatment. The device comprises a panel lamp assembly and a flat reaction chamber structure, efficient waste gas degradation without a catalyst is achieved through the characteristic that high photon energy of 172nm excimer ultraviolet light can crack most organic matter, particularly, a reflection structure is designed, 172nm excimer ultraviolet light can be efficiently reflected, the structure is formed by alternately stacking a plurality of dielectric material layers, and the dielectric material layers are arranged in the flat reaction chamber structure. The design strictly follows the 1 / 4 wavelength optical thickness principle, the reflectivity is improved to 90% or above through the optical interference effect, 172nm ultraviolet light is efficiently reflected back to a channel space, and the light energy utilization rate is remarkably improved. Through the synergistic effect of the technical characteristics, the waste gas treatment device can efficiently degrade various VOCs (volatile organic compounds), especially stubborn organic compounds, and the waste gas treatment efficiency and stability are remarkably improved.

This utility model discloses a screen structure and a high-gain white screen, belonging to the field of projection display technology. The screen structure includes two substrate layers, with a barrier layer bonded between the two substrate layers via an adhesive layer. The substrate layers, adhesive layer, and barrier layer have different refractive indices. The high-gain white screen includes a protective layer, a diffusion layer, and the aforementioned screen structure, arranged sequentially from the incident surface to the back surface. By utilizing the difference in refractive indices between the substrate layer, adhesive layer, and barrier layer, an optical effect similar to mother-of-pearl is created, reducing light penetration and enhancing light reflection and scattering. This improves detail rendering, reduces the loss of dark areas, enhances resistance to external light interference, reduces contrast, reduces color saturation distortion, reduces light loss during propagation, improves overall brightness uniformity, ensures full presentation of high-resolution signal details, and is compatible with more projection devices.

The invention provides a Michelson modulator containing a spiral waveguide phase shifter. The Michelson modulator comprises a beam splitter, the spiral waveguide phase shifter and a reflector which are connected in sequence. The spiral waveguide phase shifters comprise a first spiral waveguide phase shifter and a second spiral waveguide phase shifter; the reflecting mirrors comprise a first reflecting mirror and a second reflecting mirror; two output ports of the beam splitter are respectively connected to the first spiral waveguide phase shifter and the second spiral waveguide phase shifter; the first reflecting mirror is arranged at the tail end of the first spiral waveguide phase shifter, and the second reflecting mirror is arranged at the tail end of the second spiral waveguide phase shifter. The waveguide of the phase shifter structure in the Michelson modulator is designed into a spiral shape, so that the occupied area of the device is remarkably reduced, and the compactness of the device is improved. In addition, the structure and the performance of the modulator are further optimized in combination with the Bragg reflector, and efficient modulation is achieved on the basis that the modulation length and the modulation bandwidth are not sacrificed.

A projection lamp comprises a light source, a reflector and a shell, and the light source and the reflector are both contained in the shell. The shell comprises a bottom plate and a side wall arranged around the bottom plate, and a light outlet right facing the bottom plate is formed in one end of the side wall. The light source is arranged on the side wall and is used for emitting light; the reflector is arranged on the bottom plate and used for reflecting light rays emitted by the light source, so that the light rays are emitted from the light outlet in the direction parallel to the side wall.

The invention discloses a water-jet-guided laser head and a water-jet-guided laser processing device, relates to the technical field of laser processing, and aims to solve the problems that an existing water-jet-guided laser head cannot cool a lens and cannot dry the interior of the existing water-jet-guided laser head. According to the water guide laser head, the vortex separation structure is arranged on the shell, so that input high-pressure gas can be separated into cold airflow and hot airflow; wherein cold air flow can flow into the mirror cavity from the cold air outlet of the vortex separation channel through the cooling channel, is directly contacted with the lens assembly, exchanges heat with the lens assembly and then is discharged from the cold air discharge hole, so that the temperature of the lens is effectively reduced, and the mirror cavity is dried and cleaned; the hot air flow can flow into the fit clearance of the drying chamber and the nozzle from the hot air outlet of the vortex separation channel to dry the interior of the water guide laser head, and is discharged through the hot air discharge structure while taking away internal moisture and impurities to form positive pressure air flow blown outwards, so that the interior of the water guide laser head is further ensured to be dry and clean.

The air cabinet assembly comprises a cabinet body and a germicidal lamp assembly, the cabinet body defines a containing cavity, the germicidal lamp assembly is connected to the cabinet body, the cabinet body is provided with an inner wall face, at least part of light emitted by the germicidal lamp assembly faces the inner wall face, and at least part of the inner wall face is provided with a reflection structure. The reflection structure is configured to reflect light irradiated to the inner wall surface. According to the air cabinet assembly, due to the fact that the reflection structure is arranged on the inner wall face, light rays emitted by the sterilization lamp assembly can be reflected through the reflection structure, parts located in the containing cavity are sterilized through reflected light, the reflection efficiency of the light rays is improved, irradiation dead angles are eliminated, and the sterilization effect is guaranteed; dependence on the number and power of the lamp tubes in the germicidal lamp assembly is reduced, the service life of the germicidal lamp assembly is prolonged, meanwhile, the structure is simple, and energy consumption and maintenance cost are reduced.