Optical Properties
- Output power of optically pumped laser at threshold
- Computer modelling of molecules "F8BT" and "PFB" gives clues about their optical and electrical properties
- Imprinting is a useful technique for alignment and for making devices
Many of the active materials that we work with are highly coloured and show efficient photoluminescence. We use a range of spectroscopic techniques to investigate the absorption and subsequent emission of light in materials, using continuous and pulsed sources, such as "femtosecond" lasers (see "Fast Lab"). These techniques can be used to study conformational disorder and torsional dynamics.
We use Photo Induced Absorption ("PIA") to study excited states in materials, ellipsometry to determine refractive index, and Raman spectroscopy to understand the effects of morphology on materials. We are particularly interested in energy and charge transfer at interfaces: polymer-polymer, polymer-metal and polymer-nanocrystal.
The ability to pattern surfaces of some materials by a fine embossing technique leads to the possibility of making lasers.
Optical and electrical properties of devices such as light emitting diodes, FETs and solar cells are influenced by quantum effects, structural and geometric considerations.
Influence of copolymer interface orientation on the optical emission of polymeric semiconductor heterojunctions
A.C. Morteani, I. Avilov, J. Cornil, D. Beljonne, R.H. Friend, R.T. Phillips, C. Silva, L.M. Herz, P. Sreearunothai
Phys. Rev. Lett. PRL 96 p117403-1 - 117403-4 [2006]
Photoinduced Charge Transfer and Efficient Solar Energy Conversion in a Blend
of a Red Polyfluorene Copolymer with CdSe Nanoparticles
A. Abrusci, H.M.P. Wong, M. Svensson, M.R. Andersson, N.C. Greenham, P. Wang
Nano. Lett. 6 p1789 [2006]
For more information, follow the links on the left hand side.