Study On Fluorescence And Nonlinear Effects Of Novel AIE Materials

Organic light-emitting materials have a wide application potential in biomedical,EL devices, materials science, sensors and other fields with their excellent luminescent properties and the characteristics of easy to film. Organic light-emitting materials fluorescence will show stokes displacement when in aggregation resulting in nonlinear fluorescence intensity change, and often show fluorescence quenching phenomena. It’s practical application has been curbed. So looking for a high quantum efficiency, the thermal stability of the organic light-emitting materials is becoming a hot spot of research.In recent years, the Aggregation induced emission(Aggregation Induced Emission, an AIE) material is becoming a hot spot of research. Aggregation induced emission properties of the material will not produce fluorescence quenching when in aggregation, so it provides a new way to solve the problem of organic light-emitting materials quenching in aggregation. The fluorescence spectrum of aggregation induced emission materials won’t result in stoke displacement with concentration change, and make it a higher detection sensitivity in fluorescent probe. So the synthesis and application of AIE nature compounds or molecules have great importance in chemical research and biological science.The traditional chromophore in solution when aggregated induces fluorescence quenching phenomenon. In recent years, the aggregation induced emission(AIE)materials are becoming a hot spot of research. This paper studies a new type of aggregation induced emission material(1-rhodanine-pyrene) which has some novel optical properties. When the concentration of solution diluted, the emission peak of the sample showed a sharp blue shift. When the temperature raised, the fluorescence strength of the sample enhanced. These properties are different from common AIE materials, and it has related to the super molecular structure induced from1-rhodanine-pyrene aggregating in solution. The material has certain application prospect in biological imaging, medical field, sensors, photoelectric detection, organic display, and have important significance in organic light-emitting materials.Z-scan technology is the study of the most widely used nonlinear effect, also is one of the most simple method. The single-beam opening Z- scan technique with its advantages of simple optical path and high sensitivity is most widely applied in theexperiment. By changing the sample in the position of the focal plane in the Z-scan experiment to make the samples in focus moving back and forth. Through the double probe measuring optical power, and use origin 8 making optical power and the relationship between the focal plane moving distance curve. Normalizing the curves,and making the relation curve between the normalized transmittance and moving distance. We analysis the nonlinear effect of the sample is the saturated absorption of the nonlinear absorption.This paper mainly divided into the following several parts.The first part mainly introduces the properties and research work of AIE materials.The second part mainly introduces the AIE research of 1- rhodanine- pyrene.The third part mainly introduces the research progress of Z-scan technique.The fourth part mainly introduces the nonlinear effect research of1-rhodanine-pyrene with Z-scan technique.