Synthesis Of The Multi-branched Molecular Material And The Research Of The Two-photon Absorption Performance And The State Of Aggregation Luminous Property

Organic materials with large"π"conjugation possess strong intramolecular charge transfer and usually, result in strong fluorescence emission. Based on this idea, we designed and synthesized several chalcone-triphenylamine/carbazole chromophores that have obvious intramolecular charge transfer characteristic. Optical properties including absorption, one-photon fluorescence and two-photon fluorescence properties of chalcone-triphenylamine/carbazole chromophores in solution and aggregation as well as the state and the mechanism of aggregation luminous property.Firstly, ten new chromophores, named as WF1-WF9, have been synthesized and their structures have been confirmed. And their absorption, one-photon fluorescence or two-photon fluorescence properties in solution state have been measured. Secondly, we studied comparatively the fluorescence properties of newly synthesized chalcone-triphenylamine/carbazole chromophores in aggregation states and made nano particles.Finally, we discussed in detail the organic molecular fluorescence performance influence due to molecular structure and the state of aggregationThe results have shown as follows:1,When we discussed group effect we found that, the molecular material owing the highest fluorescence intensity was the single branch molecular material WF1 in the chalcone-triphenylamine chromophores; multi-branched molecular material WF5 had the highest absorbance in chalcone-carbazole chromophores. At the same time, when we discussed nuclear effect we found that , the absorbance and fluorescence intensity of chalcone-triphenylamine chromophores were higher than chalcone-carbazole chromophores . So, we had the conclusion that luminescent properties of triphenylamine chromophore materials was more excellent than carbazole chromophore materials. And WF1 had good two-photon fluorescence intensity attributing the success to the nuclear effect2,Temperature had an effective promotion state to aggregation illumination. When dilute solutions were cooled from 50°C to -3°C, By recording emission spectra, it was found that emission efficiencies were increased as the temperature decreased. It indicated that the rotation of chromophores were effectively limited when the temperature decreased. Restricted molecular rotation resulted in the enhanced emission efficiency. From the solution state to the aggregation state , absorbance was weaker and red shift, it indicated that materials existed J-type aggregation in bad solutions.Fluorescence intensity was higher in bad solutions except for WF4 and WF9. It made a point that ten materials had varied aggregation in bad solutions and the result of the aggregation played an active role but not an absolutely stimulative effect 3,Fluorescent quantum yield of the materials increased from the solution state to the aggregation state and WF1 was most salient according to data analysis. So, the bad solutions did not only help glowing molecules gather the pellet, but also increase fluorescence intensity and fluorescent quantum yield, decrease absorbance. Thus it enhanced the fluorescence species optics stability. Futhermore, enhance ofΦf was concerned with chalcone group. The increment of the time was but for the most part center on radiation attenuation rate increase and non radiation attenuation rate decrease.