Już 23 kwietnia 2026 roku o godz. 12:30 w Audytorium Aleksandra Jabłońskiego dr hab. Łukasz Kłopotowski, prof. IF PAN (Instytut Fizyki PAN) wygłosi wykład pt. "Probing the Photoluminescence Mechanism in Lead- And Cadmium-Free Semiconductor Nanocrystals Using Fast and Slow Spectroscopies".
Streszczenie:
Semiconductor nanocrystals have garnered the attention of chemists, physicists, and engineers as versatile materials with unique properties and exciting potential applications. The excitement of the scientific community was compounded wth awarding of the 2023 Chemistry Nobel Prize for their discovery and synthesis. However, the best known compounds are lead and cadmium chalcogenides and lead halide perovskites and for these materials, the concerns related to toxicity of lead and cadmium ions remain. As a result, the community is on a quest to find alternatives. In this talk, I will present our work on multinary nanocrystals based on I-III-VI compounds and on double perovskites. In particular, I will talk about our efforts to understand the mechanism of light emission by these nanostructures. I will discuss the results of temperature and magnetic field dependent photoluminescence dynamics, room temperature transient absorption, and single nanocrystal spectroscopy. Finally, I will show the benefits of femtosecond x-ray absorption experiments performed at free electron laser facilities in regard of probing carrier relaxation pathways with element specificity.
Organizatorem Kolokwium Czwartkowego jest Instytut Fizyki UMK w Toruniu.