GDCh-Kolloquium - Control of defects in Optical Materials and focus on applications at nanoscale
Prof. Dr. Bruno Viana
In bioimaging, the development of luminescent materials requires materials with high fluorescence intensity but also with a careful control of the defects which could affect the kinetic and intensity of the luminescence. The defects/traps must be carefully controlled to avoid room temperature detrapping and afterglow emission which alter the images, but additionally in bioimaging there is a recent large interest for materials with long persistent luminescence. Several new applications are envisioned with these materials including theranostic and sensing properties such as nanothermometry: At nanoscale, deep red and near-infrared persistent luminescence nanoparticles enable highly sensitive in vivo optical detection and complete avoidance of tissue autofluorescence. Persistent luminescence can be activated in vivo through living tissues using highly penetrating low energy photons. Surface functionalization of this photonic probe can be adjusted as well as the wavelength of the optical stimulation to favor multiple challenging biomedical applications. Our purpose is to propose new kinds of nanoprobes that could allow a local parameter (for instance: temperature) measurements for various applications (for temperature: control during hyperthermia treatments). Some examples will be presented during the seminar.
Ort: Zoom
Veranstalter: Gesellschaft Deutscher Chemiker Ortsverband Siegen, Universität Siegen