Speaker: Prof. Graham Turnbull

Time and Date: 10:00 am, June 22, 2018

Place: Room 301 of Electric Light Sources Building, Handan Campus, Fudan University

Abstract:

Organic semiconductors are efficient, visible light emitters that can be simply printed and moulded to assemble thin film optoelectronic devices. These materials are now very well established in luminescent OLED displays, but the same materials also have great potential in other areas of information and communication technologies. In this talk I will present our recent work developing advanced light sources from thin luminescent polymer films. I will show how these can be configured as miniature visible lasers [1-4] and present their possible application as ultra-thin membrane security tags [4]. I will also show how organic semiconductors may be used in both sources and receivers for high speed optical data links, [5-6] to provide an alternative wireless communication technology to WiFi.

1.  Nanoimprinted Organic Semiconductor Laser Pumped by a Light-Emitting Diode. G. Tsiminis, Y. Wang, A. L. Kanibolotsky, A. R. Inigo, P. J. Skabara, I. D. W. Samuel, G. A. Turnbull, Advanced Materials, 2013,  25, 2826-2830.

2.  Green Perovskite Distributed Feedback Lasers. J. R. Harwell, G. L. Whitworth, G. A. Turnbull, I. D. W. Samuel, Scientific Reports, 2017,  7.

3.  An Organic Vortex Laser. D. Stellinga, M. E. Pietrzyk, J. M. E. Glackin, Y. Wang, A. K. Bansal, G. A. Turnbull, K. Dholakia, I. D. W. Samuel, T. F. Krauss, Acs Nano, 2018,  12, 2389-2394.

4.  Flexible and ultra-lightweight polymer membrane lasers. M. Karl, J. M. E. Glackin, N. M. Kronenberg, G. A. Turnbull, I. D. W. Samuel, M. C. Gather, Nature Communications, 2018,  9, 1525.

5.  H. Chun, P. Manousiadis, S. Rajbhandari, D.A. Vithanage, G. Faulkner, D. Tsonev, J.J.D. McKendry, S. Videv, E. Xie, E. Gu, M.D. Dawson, H. Haas, G.A. Turnbull, I.D.W. Samuel, D.C. O’Brien IEEE Phot. Tech. Lett. 26, 2035 (2014)

6.  Wide field-of-view fluorescent antenna for visible light communications beyond the etendue limit, P. P. Manousiadis, et al., Optica 3, 702-706 (2016).

Biography:

Graham Turnbull is Professor of Physics at the University of St Andrews, and Head of the School of Physics and Astronomy. His research interests focus on photonic applications of soft materials, notably including organic semiconductors. This spans fundamental studies of light-matter interactions through to applications, including sensors for buried explosives, and technologies for lighting and optical wireless communications. A major theme of his research has been the development of low threshold polymer lasers, and has pioneered the use of LEDs as simple optical pump sources for visible organic lasers.