Study On Synthesis And Performance Of New Organic Small Molecule Fluorescent Materials

High-efficiency organic light-emitting materials have broad application prospects in the fields of organic light-emitting diodes,fluorescence detection and fluorescence imaging,and have aroused widespread research interest.Among them,the blue fluorescent material is a key factor to realize full-color display and white light emission,so it is of great significance to design and develop a new type of high-efficiency organic blue light-emitting material.Based on the fluorescent properties of the simple organic molecule 2-aryloxybenzo oxazole,a new type of organic fluorescent molecule with special AIE properties and high-efficiency solid-state blue fluorescence emission was designed and synthesized.Amine compounds are widely used in agriculture,pharmaceuticals and food industries,but volatile amine vapors can seriously harm human health.Therefore,it is very important to develop a portable fluorescent sensor for highly sensitive and selective detection of amine vapor.Based on the reaction characteristics of 2-aryloxybenzo oxazole,this thesis designs and synthesizes a portable responsive fluorescent sensor,which realizes the rapid and efficient detection of amine gases.1.By adjusting the molecular structure of 2-aryloxybenzo oxazole,a series of small organic solid fluorescent materials with dark blue luminescence characteristics have been obtained.Among them,the solid-state fluorescence quantum yields of compounds 3 and 4 are relatively high,reaching 10.3%and 11.4%.The single crystal has a V-shaped molecular structure,and J-shaped aggregates are formed between adjacent molecules.There are extensive non-covalent interactions between molecules in crystals.This work provides a new method for synthesizing organic solid-state fluorescent materials with deep blue emission.2.Based on the previous work,this work uses O bridges to connect benzoxazole and coumarin classic fluorophores,and develops a fluorescent sensor BZCO that can be used for amine gas detection.The filter paper is immersed in the CH₂Cl₂ solution of compound BZCO,and then it is evaporated to dryness to prepare a portable paper BZCO fluorescence sensor.The fluorescence sensor is easy to carry and operate during the amine gas detection process,and has the advantages of high sensitivity,low detection limit,and good selectivity.In addition,the compound BZCO can also be used for food quality inspection and as a fluorescent safety ink.This work has developed a new type of fluorescent sensor BZCO,which has broad application prospects in the fields of amine gas detection,food quality detection and anti-counterfeiting materials.