One-on-One with a MentorEducation & Career FairUPACJUST-B Poster Session

Since it was unveiled in 2020, Google DeepMind's game-changing AI tool has helped researchers all over the world to predict the 3D structures of hundreds of millions of proteins.

UCL Discovery is UCL's open access repository, showcasing and providing access to UCL research outputs from all UCL disciplines.

Understanding metabolic alterations in CKD is crucial, as serum creatinine-based diagnosis lacks precision, affecting key clinical decisions. In this study, a 1H NMR-based metabolomics approach was…

At the University of Vienna almost 11,000 personalities work together towards answering the big questions of the future. Around 7,700 of them do re...

Letar du efter ett nytt jobb? I Platsbanken hittar du tiotusentals lediga jobb att söka.

Colloidal lead halide perovskite quantum dots (QDs) exhibit size-dependent optical and electronic properties due to quantum confinement, a feature that substantiates their widespread application as classical and quantum light sources. This property is commonly characterized by photoluminescence spectroscopy, where the emission peaks blueshift with decreasing QD size. Apart from the size of the QDs, the electronic structure is strongly influenced by phonons and local disorder, being vastly different between the all-inorganic and hybrid perovskite compositions. In this study, we demonstrate that nuclear magnetic resonance (NMR) spectroscopy can serve as a powerful complementary tool to probe the local characteristics of the ground-state electronic structure. We combine optical and 207Pb NMR spectroscopy to investigate size-dependent confinement in three archetypal lead halide perovskite QDs: CsPbBr3, MAPbBr3, and FAPbBr3. While all compositions exhibit expected size-dependent photoluminescence energy, the hybrid perovskites (MAPbBr3 and FAPbBr3) display strongly reduced size-dependent confinement at room temperature when assessed via NMR. Ab initio molecular dynamics simulations suggest that this effect arises from the disorder-induced wave function modulation driven by dynamic disorder in hybrid perovskites. Experimental support for the hypothesis is provided by freezing the cation dynamics in MAPbBr3 QDs, which leads to the reappearance of the size-dependent chemical shift. By integrating local and global probes of electronic structure, our findings challenge the conventional understanding of quantum effects in soft lead halide perovskite QDs and highlight the role of disorder in shaping the local electronic structure.

The search for the 2026 Top Ten will started in January 2026 and with a submission deadline of 30 April 2026   The 2025 finalists are (in alphabetical order): Additive Manufacturing […]

Among stable isotope measurement strategies at natural abundance, position-specific isotope analysis (PSIA) is a valuable approach for food authentication and metabolism understanding. In this context...