The course complements and expands the knowledge of students in the field of photophysical and photochemical processes occurring after the absorption of light in molecules with emphasis on luminescence and other photoinduced events in complex (nano)systems. Various systems and their luminescent properties will be analyzed, including upconverting nanoparticles, clusters, aggregates, quantum dots, etc. Emphasis is placed on advanced techniques of UV-vis absorption and luminescence spectroscopy, general application of photochemical laws, description of relaxation of excited states of molecular entities and the trajectory of absorbed energy in nanosystems. Students should get general overview of photoinduced processes, knowledge for qualified analyzes and evaluation of photophysical and photochemical behavior of various systems, and also better understand photoinduced processes that might take place in their own research area. The course consists of the following parts: 1. Introduction to molecular photophysics and photochemistry: light and its interaction with matter, basic terms, excitation of molecules and their subsequent relaxation, radiative and non-radiative transitions, characterization of photophysical and photochemical processes, quantum yields, photochemical laws and rules. 2. Absorption: Lambert-Beer law and its significance for photophysical and photochemical processes, UV-vis absorption spectroscopy, transient spectroscopy, diffuse reflection spectroscopy. 3. Luminescence I, Introduction: relaxation of excited states, relaxation kinetics, basic rules, importance for analytical chemistry and detection (sensing), effect of solvents, steady-state and time-resolved luminescence spectroscopy, kinetics of luminescence and its analysis, luminescence quantum yields. 4. Luminescence II, Complex processes: quenching of excited states, bimolecular processes, effects of intramolecular rotation, quenching and aggregation induced fluorescence, excimers, exciplexes, resonance energy transfer, photoinduced electron transfer. 5. Nanomaterials: upconverting particles, rare earths, semiconductor crystals and quantum dots, photocatalysis, transition metal clusters, excitation by ionizing radiation. 6. Carbon nanomaterials: carbon dots, nanodiamonds, nanotubes, fullerenes. 7. Analysis of a selected photophysical/photochemical topics and its presentation for course members. Discussion on the selected topics. Literature: 1. Z. Gryczynski, I. Gryczynski, Practical Fluorescence Spectroscopy, Taylor & Francis Inc., (2019). 2. J. R. Lakowicz, Principles of Fluorescence Spectroscopy, 3rd Ed., Springer, (2006). 3. P. Klán, J. Wirz, Photochemistry of Organic Compounds: From Concepts to Practice. Postgraduate Chemistry Series, Wiley, (2009). 4. J. Mei et al., Aggregation-induced emission: Together we shine, united we soar! Chem. Rev. 115 (2015) 11718.
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