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SUMMARY:Towards a second generation OLED model - Prof. Reinder Coehoorn\, 
 Philips Research Laboratories
DTSTART:20080610T133000Z
DTEND:20080610T141500Z
UID:TALK12420@talks.cam.ac.uk
CONTACT:Jan Anton Koster
DESCRIPTION:Within Philips Research\, an extensive research program is bei
 ng carried out on Organic Light-Emitting Diodes (OLEDs) for lighting appli
 cations. OLEDs are potentially highly efficient large-area light sources\,
  which can be used for general lighting applications in hitherto unprecede
 nted ways\, such as light-emitting flexible foils. In the past five years\
 , the luminous\nefficacy of prototype white OLEDs has shown a very fast in
 crease\, towards a present world-record value of 64 lm/W. In principle\, t
 here seems to be no fundamental obstacle towards 100 lm/W efficiency\, bey
 ond that of fluorescent lamps. However\, in practice the ever-increasing c
 omplexity of the layer structure of OLEDs now hampers progress towards tha
 t goal. For\nthe further development of OLEDs\, the availability of an exp
 erimentally validated opto-electronic device model will be crucial. At pre
 sent\, such a model is not available. It has recently become clear that to
 day's "first generation" models\, based on conventional understanding of t
 ransport and photo-physical processes\, are insufficient for realistic OLE
 D materials. Such models neglect several consequences of the disordered na
 ture of the organic semiconductors used. In the seminar\, the present stat
 us of advanced\ndevice simulations of transport and recombination in OLEDs
  will be discussed\, as well as experiments which validate this work. It w
 ill be shown that the current density in OLEDs is expected to be highly fi
 lamentary\, instead of uniform\, and it will be argued that this might str
 ongly affect the actual recombination rate across the device.
LOCATION:Small Lecture Theatre\, Cavendish Laboratory\, Department of Phys
 ics
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