[Academic] Fwd: 2nd November, TG 703 Time 9.30 -10.30 AM

Rob Martin r.w.martin at strath.ac.uk
Tue Oct 23 15:54:50 BST 2012


Dear All,

Here are details of two talks on Nov 2nd in the Chemistry Dept. that may 
be of interest.

Regards,

Rob


-------- Original Message --------
Subject: 	Re: update: 2nd November, TG 703 Time 9.30 -10.30 AM
Date: 	Mon, 22 Oct 2012 21:08:25 +0100
From: 	Anto Regis Inigo <anto.inigo at strath.ac.uk>
To: 	Robert Martin <r.w.martin at strath.ac.uk>



Hi Rob,
We will have two lectures on 2nd November at TG 703 (9.30 - 10.30 AM) 
given by visitors to our group. Titles and abstracts are given below. 
Could you please circulate this to your group members if this is of 
interest to you?
*9.30 - 10.00 AM*
Dispersion Polymerization of Monodisperse Conjugated Polymer Particles
*Dr. Alexander J.C. Kuehne*, Research Group Leader, Interactive 
Materials Research, DWI an der RWTH Aachen e.V.
Forckenbeckstraße 50, www.dwi.rwth-aachen.de 
<http://www.dwi.rwth-aachen.de/>

Monodisperse particles are a powerful means to self-assemble 
superstructures with applications in optical and photonic devices. I 
will talk about the synthesis of such particles made entirely from 
conjugated polymers, thus having the same properties as the neat 
material but with added structural definition. The monodisperse 
particles self-assemble into photonic crystals upon drying of the 
dispersion medium and exhibit a distinct photonic stop-gap while 
retaining their photoluminescent properties. Furthermore, these 
particles can be processed and deposited from polar solvents such as 
alcohols and water, which renders the materials and processes 
environmentally more friendly and sustainable.
**
**
*10.00 - 10.30 AM
*Intermediate State Charge Transport in Multilevel Photochromic 
Light-Emitting Memory Devices

*R. Clayton Shallcross**, *

Universität zu Koln, Department of Chemistry

Dithienylethenes (DTEs) represent an exceptional class of thermally 
stable and fatigue resistant photochromic molecular switches that 
undergo a change in both their UV-visible absorption and frontier 
orbital energy levels due to a photo- and/or electrically-induced 
ring-opening and -closing reaction, which may be exploited in 
electrically-addressed nonvolatile organic memory devices. Here, we 
present a multifunctional light-emitting organic memory (LE-OMEM) diode 
employing a DTE transduction layer that affords the ability for both 
optical and electrical writing and readout. Optimized LE-OMEM diodes 
show impressive ON/OFF ratios (OORs) for both electroluminescence (EL) 
and current readout of ca. 10^4 for optical switching and ca. 10^3 for 
electrical switching. By systematically controlling the fraction of 
closed isomers in the transduction layer (X), both optical and 
electrical writing protocols demonstrate the ability to write a 
continuum of states (i.e. levels) between totally OFF and ON (see figure 
in attached pdf), offering an alternative technology for increased data 
storage density compared to typical binary memory cells. We elucidate 
the difference in the molecular-scale mechanisms that are responsible 
for the optically and electrically-driven memory effect and discuss the 
charge transport properties of these intermediate states. Furthermore, 
we present results for integration of LE-OMEM diodes into a prototype 
passive memory array and discuss the device design considerations as 
well as the number of statistically discernable grey levels per pixel.
Regards,
Inigo

*http://www.researcherid.com/rid/G-2059-2012 **__*

*********************
Research Associate
Prof Peter Skabara's Group
Department of Pure and Applied Chemistry
University of Strathclyde
Thomas Graham Building
295 Cathedral Street
Glasgow
G1 1XL

Tel. +44 (0)141 548 5805


-- 
===============================================================
Professor Robert Martin
Head of Department,
Department of Physics,               tel: 0141-5483132
Strathclyde University,              fax: 0141-5522891
John Anderson Building,              e-mail: r.w.martin at strath.ac.uk
Glasgow, U.K.
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The Department is a partner in SUPA, the Scottish Universities Physics Alliance
The University of Strathclyde is a charitable body, registered in Scotland, number SC015263



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