Regulating Excited-State Dynamics through Molecular Structure and Organization: Studies of Organic Fluorophores and Fluorescent Nanoparticles

PhD defence by Simin Jiang

Assessment Committee

Associate Professor Thorsten Hansen, Chemistry, University of Copenhagen (Chairperson)
Professor Leif Hammarström, Uppsala University
Professor Juan Cabanillas González, IMDEA Nanociencia

Supervisors

Professor Bo Wegge Laursen
Associate Professor Junsheng Chen

Department

Department of Chemistry

Place

Building: Universitetsparken 1-3, Room: aud - Lille UP1 - 04-1-22, Universitetsparken 1-3, DIKU, 2100 København Ø

Email address to gain access to the thesis: siminjiang.scut@gmail.com.
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Short description of the thesis

Fluorescent molecules are widely used in bioimaging, sensing and advanced optical materials, however, their performance strongly depends on what happens after they absorb light. This thesis investigates how molecular structure, surrounding environment and molecular organization control these ultrafast excited-state processes. The work explains the fluorescence switching of a widely used pH probe and reveals how energy moves through densely packed fluorescent nanoparticles. The results show how charge transfer, molecular packing, energy migration and trapping determine fluorescence efficiency, providing new insight for the rational design of bright and  efficient fluorescent materials.