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Lead-doped perovskite inorganic-organic hybrid materials have important application value in optoelectronic devices, solar cells, catalysis, ion exchange, and fast ion conductors. As a new type of photovoltaic material, scientists are concerned and their photoelectric conversion efficiency has been rapidly refreshed. 20%, and is expected to reach 25% of crystalline silicon cells. The semiconducting properties of these materials are mainly derived from the inorganic skeleton in the hybrid materials. Currently, the research mainly focuses on three-dimensional perovskite inorganic structures and two-dimensional layered inorganic structures. Looking for a hybrid material with a novel lead halide structure may be a solution to the problem of poor stability and poor electrical conductivity of current materials.
Guo Guocong, a researcher of the State Key Laboratory of Structural Chemistry of the Institute of Physical Structure of the Chinese Academy of Sciences and a research team led by Xu Gang, under the funding of the National Natural Science Foundation of China, prepared two lead halide hybrids with three-dimensional inorganic open framework structure with very rare structure. Compound. The two compounds were relatively stable in air, and the electrical conductivity of the powder tablet showed that the conductivity of one of the compounds was one order of magnitude higher than that of the single lead perovskite single crystal in the literature. More interestingly, it was found that the yellow/orange light-emitting lead halide inorganic framework can act synergistically with the blue-emitting organic components to achieve luminescent modulation. Using this principle, the research team obtained white light emission with a color rendering index (CRI) value of up to 96, which exceeded the barrier of one-component white light emitting material CRI of less than 90. Such materials with both conductive and luminescent properties have potential applications in light emitting diodes and other fields. Related research work was published in Chem. Sci. 2015, 6, 7222.
Subsequently, inspired by the structure of the carbon nanotubes, the research team synthesized a crystalline array of metal halide nanotubes formed by a large cluster of [PbII18I54(I2)9] via II covalent bonds. The clusters that have been reported have mainly been metal complex frameworks of V, Mo, Cr, W, Nb, etc., or polyacid compounds, but clusters made of metal halides are the first examples. Studies have found that its conductivity is an order of magnitude higher at normal temperature than the direction perpendicular to the nanotubes along the extension of the nanotubes, and has a strong temperature sensitivity. The material was successfully prepared to connect the one-dimensional nanotube material and the lead halide perovskite material. These two structurally distinct but hot research areas have established material bridges. The relevant research results were published in Angew. Chem. Int. Ed. 2016, 55, 514, and was selected as the Frontispiece of this journal. The above two tasks were reported by news media such as Materials Views and X-Mol, such as "One-dimensional Nanotube Arrays or Providing New Ideas for Lead Perovskite Lead Halides".
The utility model discloses a Kitchen Shower head that is convenient to switch the water outlet mode, has a compact structure, and is easy to use and a kitchen faucet using the kitchen shower head. The shower head includes a shower body and a shower head provided with a spray water outlet and a V-shaped water outlet. , The shower head is provided with a water separator, and the water separator is provided with an annular flow channel and an inner flow channel respectively connected to the spray water outlet body and the V-shaped water outlet body, and the lower end of the outer wall of the water separator is upwardly circular A plurality of water inlet holes connected to the annular flow channel are provided, and a first sealing ring is provided on the lower side of the water inlet hole; the water outlet end of the shower body is connected with a converter, and the converter is provided with a communicating In the water diversion cavity at the water outlet end of the shower body, the lower end of the water diversion device is installed in the water diversion cavity and can move up and down, and the upper end of the inner wall of the water diversion cavity is provided with a matching first sealing ring
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