"Organic Materials for Near-Infrared Photonics: Design, Synthesis, Property and Device Applications"

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At present, light-emitting diodes, liquid-crystal display, solar cells and other optoelectronic devices based on organic/polymer materials can only operate in the visible region (400-800 nm). Organic materials that can harvest, convert or produce light in the near-infrared (NIR) region (800-2000 nm) are less known but potentially useful in emerging photonic applications, such as telecom components, bio-imaging, heat absorbers for energy saving, and full-spectrum photovoltaic devices. A primary objective of the proposed research is to address important scientific questions related to organic optoelectronic materials: (1) how to achieve NIR-selective or panchromic absorption via the molecular bandgap tuning, (2) how to realize and utilize the desired NIR chromogenic property, (3) how to improve the quantum efficiency of NIR light emission and photovoltaic conversion. Other objectives are to develop organic photonic materials and to provide the well-trained, highly-qualified personnel. Scientific methods for the development of new optoelectronic materials and devices include (i) the design of low-bandgap materials at the molecular and supramolecular levels and (ii) utilization of unique molecular aggregation-induced effect and surface plasmonic effect. The proposed research will lead to significant advances in the development of photonic materials having the NIR-absorbing, photoluminescent, electroluminescent, photovoltaic and chromogenic properties, and demonstration of unique thermal radiation-absorbing materials and novel organic optoelectronic devices, such as light-emitting diode, photodetectors and molecular switch that can work efficiently in the near-infrared region (e.g., 800-2000 nm). The research program is designed to nurture an appreciation for modern science and technology and develop innovative training modules. The students will be trained to gain knowledge in advanced synthetic chemistry, materials science in general and photonics specifically, and have hands-on experience in synthesis, characterization, device fabrication and testing.