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SUMMARY:Modern Alchemy: Making Coinage Metals Act Like Iridium
LOCATION:Chemistry A101
TZID:America/Denver
DTSTART:20201201T000000
UID:2026-04-28-15-58-30@natsci.colostate.edu
DTSTAMP:20260428T155830
Description:CGSO Sponsored Seminar\n\nAbout the Seminar:\nHeavy metal conta
 ining phosphors\, especially iridium-based emitters\, have become the stan
 dard in high performance mobile displays and televisions. The high spin or
 bit coupling in these compounds facilitates the efficient harvesting of bo
 th singlet and triplet excitons generated in the electroluminescent proces
 s. An alternative to Ir-based emitters are solely-organic emitters based o
 n Thermally Assisted Delayed Fluorescence (TADF). Heavy-metal and TADF emi
 tters give similar OLED performance\, which stems from the fact that they 
 give very similar radiative lifetimes. We have found that the key to achie
 ving higher performance for TADF emitters is to put the metal ions back in
 to the TADF emitters. My talk will focus on the photophysical and electrol
 uminescent properties of two coordinate copper\, silver and gold carbene c
 omplexes\, i.e. (carbene)MI(donor)\, where the donor is an amide or aryl g
 roup. These complexes show high phosphorescence quantum yield (PLQY = 0.7 
 – 1.0)\, with radiative lifetimes in 0.4-3 microsecond regime. Cryogenic
  photophysical measurements show these TADF emitters have singlet-triplet 
 gaps as low as 150 cm-1 (20 meV). We have prepared organic LEDs with these
  dopants and achieved &gt\; 20% EQE for green emissive OLEDs and &gt\; 12%
  for blue emissive OLEDs\, both at comparatively low drive voltages.\n&nbs
 p\;\n\nAbout the Speaker:\nMark Thompson received his B.S. degree in Chemi
 stry in 1980 (U.C. Berkeley) and his Ph.D. in chemistry in 1985 (Californi
 a Institute of Technology). He spent 2 years as a postdoctoral fellow at O
 xford University before taking a position in the chemistry department at P
 rinceton University in 1987\, as an assistant professor. In 1995\, he move
 d his research team to the University of Southern California where he hold
 s the Ray R. Irani Chair of Chemistry. His research involves the study of 
 materials and devices for electroluminescence\, photovoltaics and solar ce
 lls\, chemical/biological sensing and catalysis. Prof. Thompson is the aut
 hor of approximately 400 papers in refereed professional journals and hold
 s more than 250 patents primarily in the areas of optoelectronic applicati
 ons\, such as light emitting devices (LEDs) and solar cells. He is a fello
 w of the AAAS and National Academy of Inventors. He has received multiple 
 awards for his work in organic LEDs\, including the MRS Medal (2006)\, the
  Jan Rajchman Medal from the Society for Information Display (2006)\, ACS 
 Richard C. Tolman Award (2011) and the ACS Chemistry of Materials Award (2
 015) and most recently he was awarded the IEEE Photonics award in 2016 and
  the Nishizawa Medal in 2017. 4:00 pm
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