Organic Optoelectronic Materials and Technique
Organic Optoelectronic Materials and Technique
Organic optoelectronic materials (organic materials, coordinated materials and polymeric materials) have attracted wide applications in various electronic devices. The major challenge in designing organic optoelectronic materials with high quantum yield, good charge mobility and strong absorbance relies on not only molecular structure but also supramolecular packing modes. This research group focuses on the construction of high-performance organic functional materials as well as their applications in organic light emitting diodes, organic solar cells and organic semiconductors. In addition, the practical application and the key technology of organic optoelectronics are also important issues we are concerned.
The solvent field and temperature field are used to explore the mutual transformation process and mechanism between the α-conformation and β-conformation in Poly(9,9-dioctylfluorene) (PFO) precursor solution. The conformational transformation of PFO chain is researched by UV-vis absorption spectra and the proportions of β-conformation are quantitatively calculated. The corresponding variation trend of aggregation structure is researched by static/dynamic light scattering (SLS/DLS). It is found that the mutual transformation process between α-conformation and β-conformation are reversible in essence, and the mutual transformation mechanism between them is also clear. Especially in the transformation processes, the complicated relationship between the β-conformation and aggregation structure is clearly understood, while it was still on debate before. The above results
Wide bandgap materials which emit violet or ultraviolet (UV) light (emission shorter than 400 nm), are also of great importance since such devices can be used to generate light of all colors either by the irradiation of luminescent dyes or by energy transfer to emissive dopants. The pursuit for wide bandgap materials has been an ever-increasing issue in organic optoelectronic field, because their performances are far from satisfaction. Our group mainly focuses on constructing wide bandgap materials with high performance and their application in organic light emitting diodes.
The detection of some compounds, such as explosives and metal ions are of great interest, due to their influence to the entironment, public security and human health. Our research group currently concentrates on fluorometric and electrochemical sensors for TNT, metal ions and anions. We have designed and synthesized a series of fluorescent conjugated/ compounds, and they have been applied to detect explosives, metal ions and anions by fluorometric channel with high sensitivity and selectivity. Specially, some materials have shown the very low limitation of detection (～ 10 -11 M) to Pb2+ as the electrochemical sensor, which is among the best reported results.
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