Wenjing Tian: Highly Solid-State Emissive Organic Fluorescent Materials
|When:||Fr 03-03-2017 11:00 - 12:00|
Organic fluorescent materials with high solid state fluorescence efficiency have attracted intense attention for their distinct photoelectric properties and wide potential applications in the field of organic light-emitting diodes, organic field effect transistors, organic solid-state lasers, sensors and memories. Massive effort has been spent on the molecular design and modification, as well as the related applications of organic fluorescent materials which show strong fluorescence in the solid. In our group, a series of organic fluorescent materials with high solid state fluorescence efficiency have been designed and synthesized. The investigation of the related mechanism for the high solid state fluorescence efficiency indicated that the restriction of the torsional motions by the intermolecular interaction leads to the enhanced fluorescence in aggregates. In addition, the steric hindrance arising from the terminal groups makes the center luminophore not too close with others in the aggregates. As a result, there is a large distance and no obvious face-to-face π–π interaction between adjacent molecules, which contributes to the emission in the solid state. The study on the photoelectric properties of these organic fluorescent materials shows the bright future of the materials in the fields of organic solid lasers, electroluminescence and sensors.