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dc.contributor.authorMeerholz, Klaus
dc.date.accessioned2018-05-23T17:40:54Z
dc.date.available2018-05-23T17:40:54Z
dc.date.issued2018-03-09
dc.identifier.urihttp://hdl.handle.net/1853/59708
dc.descriptionPresented on May 9, 2018 at 4:00 p.m. in the Krone Engineered Biosystems Building, Room 1005.en_US
dc.descriptionProfessor Meerholz is Chair of the Graduate School of Chemistry at the University of Cologne. Since 2011, Professor Meerholz has been the President of COPT NRW e.V. (Center for Organic Production Technologies in NRW).en_US
dc.descriptionRuntime: 53:33 minutesen_US
dc.description.abstractPhotochromic molecules provide an intriguing and relatively untapped alternative to traditional 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 photochromes (XDTE) into a solution-processed, multilayer OLED. The XDTE molecules undergo a change in both their UV-visible absorption and energy level position due to a photo- and/or electrically-induced ring-opening/-closing reaction. Exploiting the difference in HOMO and LUMO energies of both isomers and the subsequent change in hole-injection barrier we use this XDTE layer to control the hole injection and transport within our OLED layer stack. Optimized devices have displayed ON/OFF ratios in both current and electroluminescence approaching 106. We investigate both, optical and electrical programming of the OMEM devices and show that precise control of the ratio of both isomers in the active layer enables access to a multitude of intermediate states, demonstrating the potential of these devices for future multi-level memory applications. We report a dynamic range of ca. 200.000, thus, storage of up to 16 bits per pixel seem feasible. We also take advantage of these devices with variable energy landscape to study trapping.en_US
dc.language.isoen_USen_US
dc.relation.ispartofseriesCOPE Distinguished Lecture Seriesen_US
dc.subjectOMEM devicesen_US
dc.subjectOrganic memoryen_US
dc.subjectPhotochromic moleculesen_US
dc.titleOrganic Memories Featuring Multi-Bit Storageen_US
dc.typeLectureen_US
dc.typeVideoen_US
dc.contributor.corporatenameGeorgia Institute of Technology. Center for Organic Photonics and Electronicsen_US
dc.contributor.corporatenameUniversity of Cologne. Dept. of Chemistryen_US


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