BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Triplet interactions in solution processed organic devices - Dr. D
 irk Hertel\, University of Cologne
DTSTART:20080318T143000Z
DTEND:20080318T151500Z
UID:TALK10954@talks.cam.ac.uk
CONTACT:Jan Anton Koster
DESCRIPTION:To motivate the significance of triplet charge interactions I 
 will briefly introduce recent progress in solution processed phosphorescen
 t organic light-emitting diodes (OLEDs). In contrast to small organic mole
 cule devices\, complete modelling of the devices is lacking due to missing
  rate constants for a variety of dynamic processes in solution based OLEDs
 . We developed a method based on time-resolved gated spectroscopy to inves
 tigate triplet charge interactions. I will present our study of triplet ch
 arge interactions in unipolar devices of polymers and small molecules dope
 d with Pt(II)- of Ir(III)-complexes. To quantify interaction processes it 
 is essential to obtain space-charge-limited currents. From our measurement
 s we extract the mobility which is in good agreement with independent time
 -of-flight studies. It will be shown how matrix and complex structure infl
 uence the rate constant for triplet-charge interaction. At the end I will 
 show results on the magnetic field influence on triplet charge interaction
 s which might give some insight to understanding of organic magnetoresista
 nce effects.
LOCATION:Small Lecture Theatre\, Cavendish Laboratory\, Department of Phys
 ics
END:VEVENT
END:VCALENDAR