A Dual-mode Optical Sensor Was Constructed Based On The Structure Color Of Photonic Crystal And The Fluorescence Properties Of Fluorescent Material

Display plays an important role in wearable system,which can visually process physical and sensing signals of human body.Photonic crystal is a kind of material with periodic self-assembly structure in mesoscopic scale,and has the performance of color rendering under natural light.Inorganic cesium lead halide perovskite quantum dots are a new type of semiconductor,which has potential research value in the field of luminescence display,but there are still some problems such as poor environmental stability and insufficient luminescence intensity.This paper carries out the following research work:（1）Silica microspheres with a particle size of 190～290 nm and good monodisperse performance were successfully prepared by Stober method,and the factors affecting the particle size of Si O₂microspheres were explored.Photonic crystal films were prepared by self-assembly method.After comparison,it is concluded that the photonic crystal films obtained by electrophoretic deposition method have higher density,obvious structure color,and can be prepared in a large area.（2）The enhancement effect of photonic crystals on the fluorescence intensity of perovskite quantum dots was studied.Three kinds of Si O₂microspheres with different particle sizes were prepared,and the fluorescence enhancement of three kinds of halogen perovskite quantum dots was realized.Meanwhile,Si O₂films with different thickness were prepared by electrophoretic deposition technology,which can enhance quantum dots to different degrees.The enhanced photonic crystal quantum dot films are studied from Angle.Finally,the photoluminescence attenuation is reduced from 51%to 16%by the protection of the isolation layer of polydimethylsilane.（3）Colloidal spheres of zinc sulfide were prepared by co-precipitation method.It was found that the particle size of zinc sulfide microspheres prepared by low temperature method was controllable,and colloidal spheres were assembled on glass substrate by gravity self-assembly method.The fluorescence emission peak of Zn S:Mn²⁺is about 550 nm,which lays a foundation for the realization of the fluorescence performance of Zn S:Mn²⁺.