Abstract: A method for preparing a double-sided microlens array, which is used to prepare a uniform, large-area and easy-to-control microlens array on upper and lower surfaces of a sapphire glass lens. A complete laser wavefront is spatially divided into many tiny parts, and each part is focused on the focal plane by a corresponding small lens, and the light spots are overlapped to achieve uniform light in a specific area. The sapphire glass lens is applied to the deep ultraviolet LED inorganic module packaging device to reduce the total reflection loss between the deep ultraviolet LED package optical window-air interface, and focus the light passing through the lens on the focal plane, while increasing the emission of light Coupling ability, uniform light intensity of ultraviolet LED.

Abstract: A preparation method of SnO2@Sn coated reduced graphene oxide composite material. By compounding reduced graphene oxide and SnO2, SnO2 undergoes conversion and alloying reactions to form Sn nanoparticles, and the three components have a synergistic effect and good reversibility. Nano SnO2@Sn particles are uniformly distributed on the ultrathin RGO nanosheets. RGO can effectively alleviate volume expansion caused by SnO2 and prevent SnO2@Sn nanoparticles from agglomeration during cycle. The adhesion of SnO2@Sn on RGO can also effectively reduce the repacking of RGO nanosheets, so that the composite material maintains a large surface area during the charge-discharge process, providing sufficient space for the storage of potassium ions. Therefore, the prepared SnO2@Sn coated reduced graphene oxide composite material (SnO2 @Sn@RGO) has excellent electrochemical performance, exhibits excellent cycle performance, rate capability and long-term cycle stability, and has a very ideal first coulomb efficient.

Abstract: A method for preparing a double-sided microlens array, which is used to prepare a uniform, large-area and easy-to-control microlens array on upper and lower surfaces of a sapphire glass lens. A complete laser wavefront is spatially divided into many tiny parts, and each part is focused on the focal plane by a corresponding small lens, and the light spots are overlapped to achieve uniform light in a specific area. The sapphire glass lens is applied to the deep ultraviolet LED inorganic module packaging device to reduce the total reflection loss between the deep ultraviolet LED package optical window-air interface, and focus the light passing through the lens on the focal plane, while increasing the emission of light Coupling ability, uniform light intensity of ultraviolet LED.