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UID:69da140ec1710
DTSTAMP:20260411T052742
DTSTART:20140917T110000
SEQUENCE:0
TRANSP:OPAQUE
DTEND:20140917T123000
URL:https://murmitoyen.com/events/vanille/udem/detail/470531
LOCATION:Polytechnique Montréal - Pavillon J.-Armand-Bombardier\, 5155\, a
 venue Decelles\, Montréal\, QC\, Canada\, H3T 2B1
SUMMARY:Conférence du Professeur Klaus Meerholz (Cologne)
DESCRIPTION:Titre : Organic Memory Elements.Conférence du Professeur Klaus
  Meerholz de l'Institut de chimie physique à l'Université de Cologne (Al
 lemagne). La conférence sera prononcée en anglais.Résumé : Photochromi
 c molecules provide an intriguing and relatively untapped alternative to t
 raditional materials utilized in organic memory devices. We have recently 
 reported on a new prototype of a nonvolatile light-emitting organic memory
  (LE-OMEM) that integrates a layer of crosslinkable dithienylethene photoc
 hromes (XDTE) into a solution-processed\, multilayer OLED. The XDTE molecu
 les undergo a change in both their UV-visible absorption and energy level 
 position due to a photo- and/or electrically-induced ringopening/- closing
  reaction. Exploiting the difference in HOMO and LUMO energies of both iso
 mers and the subsequent change in hole-injection barrier we use this XDTE 
 layer as an electrical switch within our OLED layer stack. Optimized devic
 es have displayed ON/OFF ratios in both current and electroluminescence of
  greater than 104. We investigate both optical and electrical programming 
 of the OMEM devices and show that precise control of the ratio of both iso
 mers in the active layer enables access to a multitude of intermediate sta
 tes demonstrating the potential of these devices for future multilevel mem
 ory applications. We also discuss the difference in the molecular-scale me
 chanisms that are responsible for the optically- and electrically-induced 
 switching effect in these devices by insitu monitoring of the fraction of 
 closed molecules as a function of the external stimulus.Information suppl
 émentaire  
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