Chemistry Weekly Seminar - Zac Hudson, University of British Columbia
Zac Hudson, Associate Professor and Canada Research Chair in Sustainable Chemistry in the Department of Chemistry, University of British Columbia, will present a seminar at 1:30 pm in HLTH GB06.
Title
High-Performance Luminescent Materials using Structural Constraint
Abstract
Stability under excitation is critical to nearly all applications of luminescent materials. Nonradiative decay pathways that cause photobleaching or decomposition limit the usefulness of organic semiconductors in electronics, bioimaging, and photocatalysts. Here we describe new pi-conjugated systems with locked planarity designed to limit nonradiative decay. We use s-heptazines and imidazoacridines as strong electron acceptors, and azatriangulenes as electron donors to give materials exhibiting thermally activated delayed fluorescence (TADF), room-temperature phosphorescence, and two-photon absorption. These materials exhibit reduced photobleaching, large two-photon cross-sections and photoluminescence quantum yields near 100%. We also use scanning tunneling microscopy on Ag(111) to probe the electronic interactions of these materials on surfaces. This lecture will also describe the use of high-performance TADF materials in luminescent nanoparticles for bioimaging, and as photocatalysts for high-energy organic transformations useful to drug discovery campaigns.
Date: Friday, February 17
Time: 1:30 pm
Place: HLTH GB06