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Details of Grant 

EPSRC Reference: GR/R19465/01
Title: Ultrafast Spectroscopy of High-Energy Excited States In In Luminescent Conjugated Polymers
Principal Investigator: Friend, Professor Sir R
Other Investigators:
Researcher Co-Investigators:
Project Partners:
Department: Physics
Organisation: University of Cambridge
Scheme: Standard Research (Pre-FEC)
Starts: 01 September 2001 Ends: 28 February 2005 Value (£): 307,531
EPSRC Research Topic Classifications:
Condensed Matter Physics
EPSRC Industrial Sector Classifications:
Electronics Chemicals
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Panel History:  
Summary on Grant Application Form
The proposed programme of work involves incorporating a commercially available OPA to our existing femtosecond transient absorption apparatus. This will allow extension of both pump and probe photon energy ranges, which are currently limited to the fundamental (1.59 eV) or harmonics of our source (pump) and to a white light continuum centred on the fundamental (probe). Extension of the probe photon energy range to the mid-infrared region will allow direct probe of polaronic spectroscopic signatures via sub-gap absorption and infrared-active vibrational (I RA V) modes to directly interrogate photoinduced charge density. Multiple-excitation-pulse transient-absorption measurements will be made to controllably prepare and probe dynamics of high-energy excitonic states. This will be done by sequential electronic transitions accessed with two non-degenerate and temporally separable excitation optical pulses. The focus is in the detailed understanding of relaxation pathways of this class of electronic states, including the mechanism for ultrafast charge photogeneration. A second direction will involve the study of gain and stimulated emission in polymer samples. For example, photonic structures composed of directed self-organisation of conjugated polymer blends through patterned surface energy interactions will be investigated. We intend to investigate the properties of these with the techniques developed here. Selective excitation of one component of a periodic blend will be advantageous to do these measurements.
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Organisation Website: http://www.cam.ac.uk