3results about How to "Improve light collection efficiency" patented technology

The invention discloses a distinguishing table type X-ray spectrometer and an X-ray absorption spectrum testing method, and relates to the technical field of spectral measurement. The high-resolution table type X-ray spectrometer comprises a sample signal source which is located in a Dowland circle and is used for generating X-rays; the exponential crystal is a bent crystal, the surface shape of the exponential crystal is defined by an exponential equation, so that different points on the curved surface of the crystal have different curvature radiuses and correspond to Rowland circles with different radiuses, each point on the exponential crystal is tangent to the corresponding Rowland circle, and the exponential crystal is used for performing monochromatization and focusing on the X-ray incident from the sample signal source; and the detector is positioned on a surface formed by the corresponding imaging points on each Rowland circle, and is used for receiving the X-rays which are monochromatized and focused by the index crystal and outputting corresponding light intensity signals. Therefore, through the cooperation of the index crystal and the multi-Rowland circle structure, the X-ray absorption spectrum test with high light receiving efficiency, high spectral resolution and wide energy spectrum range can be realized, and the comprehensive performance of the desk type spectrometer is improved.

This invention relates to the field of nanoscale full-spectrum photocatalytic materials, and particularly to a method for preparing a molybdenum selenide / oxygen-deficient bismuth oxybromine@gold three-phase Z-type heterojunction photocatalyst. This method solves the problems of low photogenerated electron-hole separation efficiency, narrow full-spectrum response range, and poor stability in existing bismuth-based photocatalysts. The preparation method involves first preparing oxygen-deficient BiOBr nanospheres via a solvothermal method, then directly reacting tetrachloroauric acid with oleylamine in toluene to prepare small-particle-size monodisperse Au nanoparticles, which are then combined with oxygen-deficient BiOBr to prepare a BiOBr@Au nanosphere core-shell structure. Finally, a MoSe2 / oxygen-deficient BiOBr@Au three-phase composite material is prepared via a hydrothermal reaction. The catalyst of this invention exhibits absorption capacity under the full spectrum of light, and simultaneously achieves a synergistic enhancement of carrier separation efficiency and strong redox capability, demonstrating excellent photocatalytic activity and the ability to efficiently degrade pollutants and produce hydrogen.

This application provides a stacked optocoupler packaging structure and its fabrication method, belonging to the field of optoelectronic semiconductor packaging technology. The structure includes: an emitter lead frame, an infrared chip, a receiver lead frame, and a photosensitive chip; the infrared chip is flip-chip bonded to the emitter lead frame; the photosensitive chip is bonded to the receiver lead frame; the emitter and receiver lead frames are stacked vertically; a Fresnel focusing lens is positioned above the photosensitive chip and bonded to it with an adhesive; a packaging shell is composed of a transparent inner potting compound layer and a black outer potting compound layer, formed sequentially by molding. The packaging shell encapsulates the emitter assembly, receiver assembly, and Fresnel focusing lens, and exposes some pins of the emitter and receiver lead frames. This application achieves high isolation voltage, reduces packaging size, improves photoelectric conversion efficiency, enhances long-term reliability, and simplifies the manufacturing process.