BEGIN:VCALENDAR VERSION:2.0 PRODID:-//ZContent.net//ZapCalLib 1.0//EN CALSCALE:GREGORIAN METHOD:PUBLISH BEGIN:VEVENT SUMMARY:The Mechanisms Governing Colloidal Quantum Dot Size And Size Distri butions LOCATION:Chemistry A101 TZID:America/Denver DTSTART:20240322T160000 UID:2026-04-29-05-10-37@natsci.colostate.edu DTSTAMP:20260429T051037 Description:About the Seminar:\n\nThe size and shape homogeneity of modern colloidal semiconductor nanocrystals or ‘Quantum Dots’ (QDs) result in their characteristically narrow photoluminescence linewidths. This narrow and tunable luminescence is driving the cutting edge in display technolog ies and can increase the luminous efficacy of commercially viable solid st ate lighting devices by >\; 25%. These properties stem from the extraord inary size and size distributions characteristic of colloidal synthesis\, properties that are optimized empirically rather than on a sound understan ding of the mechanism controlling their formation. My lecture will describ ed the history of QD development leading to the 2023 Nobel Prize in Chemis try and our mechanistic investigations of the pathways that govern size an d polydispersity. Our work has demonstrated the surprising finding that si ze and size distributions are primarily governed by the reactivity of nano crystals toward monomer attachment rather than the conventional “burst o f nucleation” and diffusion limited growth hypothesis that has dominated synthetic design for the last 40 years. I will also describe a one pot sy nthesis of core-shell and graded alloy QDs whose microstructure is optimiz ed for high flux solid state lighting applications.\n\nAbout the Speaker: \n\nJonathan Owen obtained a BS from the University of Wisconsin-Madison in 2000\, a PhD from Caltech in 2005 and was a postdoctoral researcher at UC Berkeley until 2009. In 2009 he joined the faculty at Columbia Universi ty where he is currently Associate Professor of Chemistry. His group studi es the coordination chemistry of colloidal semiconductor nanocrystals\, as well as the mechanism of nanocrystal nucleation and growth. He has receiv ed several awards for his work including: The 3M Nontenured Faculty Award (2010)\; The Early Career Award from the Department of Energy (2011)\; The DuPont Young Faculty Award (2011)\; A Career Award from the National Scie nce Foundation (2012)\; The Award in Pure Chemistry from the American Chem ical Society (2016)\; The Lenfest Distinguished Faculty Fellowship from Co lumbia University (2023)\; and the Award in Inorganic Nanoscience from the American Chemical Society (2023). 4:00 pm END:VEVENT END:VCALENDAR