Time: 9:00-9:45 am, Sept. 16th
Lecturer: Dr. Wang Feng, vice professor of City University of Hong Kong
Content: Spectral conversion of light radiation is essential for a variety of modern-day technologies including displays, photovoltaics, data storage, and cancer therapy. In the past decades, a variety of luminescent materials, including organic dyes and semiconductor quantum dots, were developed to realize photon energy conversion in the ultraviolet (UV) to near infrared (NIR) spectral range. However, practical application of these techniques is typically limited by constraints such as toxicity and/or poor stability. In this regard, lanthanide-doped nanoparticles have been developed as a promising alternative to conventional luminescent nanomateerials. By comparison, these nanoparticles offer low cytotoxicity, sharp emission peaks, long-lived excited electronic states, as well as high stability against photo bleaching and chemical degradation. In this talk, I focus on our recent efforts on lanthanide-doped core-shell nanoparticles that are generally composed of a layer-by-layer structure with a set of lanthanide ions incorporated into separate layer. Examples will be given to demonstrate how to tune the luminescence process and enhance multiphoton upconversion emission for exciting new technological applications.
Interested teachers and students are all welcomed!