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SUMMARY:Exploring Excimer Formation through Ligand Design in Pt(II) Complex
 es for OLED Emitters
LOCATION:Chemistry A101
TZID:America/Denver
DTSTART:20181001T000000
UID:2026-04-08-19-32-31@natsci.colostate.edu
DTSTAMP:20260408T193231
Description:Literature Seminar Abstract\n\nPt(II) complexes have been exten
 sively investigated as emitter dopants for organic light emitting diodes (
 OLEDs). A dopant greatly increases OLED efficiency due to the ability of t
 he dopant to emit at room temperature from a triplet excited state. Triple
 t states represent the majority of excited states formed in OLED emitters 
 during operation and cannot be utilized productively by traditional organi
 c materials due to dominance of non-radiative decay pathways. Design of th
 e dopant complex thus requires optimizing key photophysical parameters (e.
 g. maximizing emission quantum yield and minimizing the room temperature p
 hosphorescence lifetime). The formation of excimers (excited dimers) is ty
 pically avoided due to its propensity to lower the emission quantum yield.
  However\, Pinter et. al. have explored a family of emissive cyclometalate
 d Pt(II) complexes in which addition of a N into the backbone of the N-het
 erocyclic carbene ligand leads to the unprecedented result that increasing
  the concentration of excimers formed leads to an increased emission quant
 um yield and decreased phosphorescence lifetime. In addition\, the excimer
  formation could be controlled in solid-state thin films through selective
  wavelength irradiation and could be suppressed by incorporation of increa
 singly bulky auxiliary ligands. This discovery represents a design strateg
 y that might improve existing excimer-based\, single layer white light emi
 tters. 4:00 pm
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