Preparation And Application Of UV-Responsive Photobase Generators/Photonic Crystal Composite Material

In this thesis,a series of photobase generators(SPrC,SPhC,SPnC)with controllable fluorescence bands were designed and synthesized.By controlling the size of the conjugate structure,different fluorescence bands can be obtained.With the help of the TD-DFT method,the simulation results obtained are consistent with the actual experiments.Based on the photochemical characteristics of the above series of photobase generators,we have realized the identification of multicolor fluorescent patterns.Then,the Stober method was used to prepare silica microspheres with different particle diameters,and photonic crystals were prepared by vertical sedimentation.We combined the optimal combination of the fluorescence color of the photoamine-generating compound with the photonic crystal structure color to prepare a UV-based response The composite material of the photo-amine-producing compound and the photonic crystal obtained a dual multicolor pattern.The above research results will have important application value in the field of anti-counterfeiting materials.The main contents include:1.Study on the preparation and imaging mechanism of multicolor fluorescent patterns based on photoamine compounds.The specific research contents include:designing and preparing a series of photobase generators(SPrC,SPhC,SPnC)with controllable fluorescence bands,studying their synthetic process routes,and characterizing and verifying their molecular structures by means of infrared spectroscopy and nuclear magnetic resonance.Ultraviolet spectrum and fluorescence spectrum were used to study the spectral characteristics,photochemical characteristics and photodecomposition behavior of photoamine compounds.With the aid of TD-DFT method,the simulation calculation results were fitted with actual experiments to verify the matching degree of the molecular structure.Based on the photochemical characteristics of a series of photobase generators,through the process of multiple imaging,the identification of multicolor fluorescent patterns is realized.The prepared anti-counterfeiting labels,special marks,bar codes and two-dimensional codes have strong anti-counterfeiting functions.2.Preparation and application of photoamine compounds/photonic crystal composites based on ultraviolet light response.The specific research contents include:using the improved Stober method to prepare silica microspheres with uniform particle size,and self-assembly of silica microspheres with uniform particle size through vertical sedimentation to form photonic crystals.The dynamic light scattering method was used to study the particle size distribution of silica microspheres,as well as the angular dependence and optical properties of photonic crystals.The experimental results show that the silica microspheres prepared by the improved Stober method are monodispersed.By adjusting the concentration of ammonia water,a series of silica microspheres with different particle sizes were prepared,and photonic crystals with different colors were assembled.The obtained photonic crystal has high reflection intensity and is arranged in an orderly and regular manner.We combined the photoluminescence compound's fluorescent color with the photonic crystal structure color optimization combination to prepare a photoamine-producing compound and photonic crystal composite material based on ultraviolet light response,and obtained a dual multicolor pattern.The above research results will have important application value in the field of anti-counterfeiting materials.