Louis Brus

Columbia University

Louis Brus (1943–2026) was the Samuel Latham Mitchill Professor of Chemistry at Columbia University and a co-recipient of the 2023 Nobel Prize in Chemistry for the discovery of colloidal semiconductor nanocrystals known as quantum dots. Working at AT&T Bell Laboratories in the early 1980s, Brus discovered that the optical and electronic properties of tiny colloidal semiconductor particles depend strongly on their size — the smaller the crystal, the more its electrons are quantum-confined and the more its absorption and emission shift toward the blue. He formalized this insight in the Brus equation, which relates a nanocrystal's band gap to its radius and remains a foundational result of nanoscience. This size-dependent tunability is the physical basis for the entire quantum-dot industry, from vivid display panels to fluorescent biological labels and solar-energy materials. After more than two decades at Bell Labs, Brus joined Columbia University, where he extended his work to single-molecule spectroscopy and the chemistry of graphene and other two-dimensional materials. His research was sustained by Department of Energy and National Science Foundation funding, and many of his trainees went on to found or lead nanomaterials companies. Laboratories built on his discoveries are intensive consumers of colloidal-synthesis glassware, optical spectrometers, electron microscopes, and inert-atmosphere equipment, placing his scientific lineage at the center of the instrumentation market serving nanochemistry.