[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.
G4 0NG
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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