Our research group is mainly committed to the research of ultrafast spectroscopy and single molecule spectroscopy, and has developed and established a variety of new single molecule spectroscopy methods, and successfully applied to the photophysical mechanism of a variety of different systems, including important small molecules, conjugated polymers, natural photosynthetic tissues and new photovoltaic materials. The current specific direction of the research is:

(1) Development of single molecule spectroscopy techniques

(2) Study of single molecule photophysical mechanisms and internal energy transfer processes;

(3)Study on photophysical mechanism of novel photoelectric materials

(4) Development of single molecule devices

    The primary limitation of single-molecule fluorescence technology is that it can only detect fluorescent-emitting substances. However, many substances in nature exhibit weak fluorescence or are non-fluorescent. To enable the detection of such substances, single-molecule photothermal technology was developed. Our research group has further advanced this field by integrating fluorescence, photothermal, and scattering channels, allowing for simultaneous detection through all three methods. This approach facilitates a deeper and more comprehensive understanding of the interactions between light and matter.

    Quantum dots, with their unique zero-dimensional quantum confinement, size-dependent properties, and surface effects, exhibit remarkable optical characteristics, including wide spectral coverage and high quantum yield. Our research group primarily focuses on discovering novel properties of new single-particle quantum dots, investigating their photophysical mechanisms, and developing highly sensitive single-quantum-dot devices.

    New photoelectric materials such as perovskites, carbon-based materials, and quantum dots have demonstrated outstanding performance and promising potential in photovoltaic and light-emitting devices. To deepen our understanding of the photophysical mechanisms of these materials under light excitation and electric fields, this research employs spectroscopy to analyze carrier transport behaviors, ion migration processes, and interactions between these materials and light, electricity, and external environments. This approach offers an effective strategy for enhancing performance and advancing the application of new photoelectric materials.

    Individual molecules are highly sensitive to their surrounding environment, where factors like electric field, temperature, pressure, and even minor disturbances from chemical groups can alter their spectral lines and lifetimes. Leveraging this sensitivity, we have developed a nano-detection device that uses single molecules as probes to detect weak vibrational signals at both low and room temperatures. This device enables highly sensitive, localized detection of weak vibrational signals with exceptional spatial resolution.