Publication date: 21st July 2025
Colloidal lead halide perovskites (LHP) nanocrystals (NCs) are popular light-emissive materials for optoelectronic devices, of interest for LEDs, LCDs, lasers and quantum light sources. Most studies on LHP NCs focus on relatively large NCs exceeding 10 nm in size, exhibiting weak to no quantum confinement effects. Recently, we showed that perovskite quantum dots (pQDs) can be synthesized using a newly developed synthesis route, resulting in pQDs that are tunable between 3 and 13 nm range.[1]
Spectroscopy has always played a key role in understanding both the chemical and physical properties of quantum dots, as is also the case for perovskite QDs. Particularly, the soft and ionic nature of perovskites strongly influences many properties. In this talk, I will discuss how we use both in situ spectroscopy and transient absorption spectroscopy ranging from measurements on the minute scales all the way to the femtosecond time scales. This includes the growth and nucleation of the pQDs,[1] their ionic halide exchanges,[2] excitons in these QDs,[3] exciton-exciton interactions,[4] as well as exciton phonon interactions. This highlights the many unique structural and optical properties of pQDs
We acknowledge financial support by the Bavarian State Ministry of Science, Research, and Arts and the LMU Munich through the grant “Solar Technologies go Hybrid (SolTech)”, as well as the LMUexcellent, funded by the Federal Ministry of Education and Research (BMBF)
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