ORC Seminars 2011

Speaker: Dr Gavin Mountjoy, Functional Materials Group, School of Physical Sciences, University of Kent   

Date:  20 July 2011

Time: 2pm

Venue: Building 53, room 4025

Abstract: 

Molecular dynamics has been used to make models of Eu3+ doped silica and sodium silicate glasses.  These relatively simple compositions enabled a detailed examination of the distribution and local environment of Eu3+ ions.  The results are helpful in predicting the distribution of distances from a Eu3+ ion to it's closest Eu3+ neighbour.  This is important for phenomena such as concentration quenching.  The Superposition Model has been used to simulate optical emission and absorption spectra for Eu3+ ions in the molecular dynamics models with different local environments.  The results reveal which features of local environment most increase the crystal field strength and hence inhomogeneous line width broadening.  These insights can be useful when seeking  glass compositions with improved luminescence properties.

Biography:

Dr. Gavin Mountjoy first studied Physics at Victoria University of Wellington where he obtained a BSc.  A Commonwealth Scholarship enabled him to undertake a PhD in the Microstructural Physics Group at the Cavendish Laboratory, University of Cambridge.  This was followed by work as a Research Associate in the Center for Solid State Science at Arizona State University, U.S.A.  In 2001 he was appointed as a Lecturer in the School of Physical Sciences at University of Kent.  In 2005-2006 he undertook a Marie Curie Fellowship in the Functional Materials Group, University of Cagliari, Italy.  He returned to School of Physical Sciences at University of Kent in 2007 as a Senior Lecturer.

Copyright University of Southampton 2006