| EPSRC Reference: |
GR/L83431/01 |
| Title: |
HIGH EXCITATION DENSITIES IN OPTICALLY & ELECTRICALLY EXCITED SEMICONDUCTING 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 January 1998 |
Ends: |
31 December 2000 |
Value (£): |
235,112
|
| EPSRC Research Topic Classifications: |
| Materials Characterisation |
|
|
| EPSRC Industrial Sector Classifications: |
| No relevance to Underpinning Sectors |
|
|
| Related Grants: |
|
| Panel History: |
|
|
Summary on Grant Application Form |
|
Our recent work has shown that semiconducting polymers which can be used to fabricate polymer LEDs can show very high luminescence efficiency, can be used as optically-pumpable lasing media and can be driven electrically to high peak brightnesses. There is therefore scope for fabrication of injection lasers with these materials. However the operation of devices in this regime of high excitation densities (above about 10^17 cm^-3) depends on the physics of the elementary excitations present in these materials (singlet and triplet excitons, charged polarons) at these high densities. At present little is known, though we have evidence for exciton-exciton collision and annihilation and for very strong increases in carrier mobilities (which enable very high peak current densities to be achieved).The programme of work is concerned with establishing the physics of this high excitation density regime. It requires a coordinated programme of device fabrication (LEDs, optical microcavities etc), optical excitation and probing (using a 0.1 psec laser system), and electrical excitation and measurement (both optical and electrical). Results will be used to establish limits to device performance and this will be assessed in the context of injection lasers and schemes for passive-matrix driving of high-information content displays.
|
|
Key Findings |
|
This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
|
|
Potential use in non-academic contexts |
|
This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
|
|
Impacts |
|
| Description |
This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk |
| Summary |
|
| Date Materialised |
|
|
|
|
Sectors submitted by the Researcher |
|
This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
|
| Project URL: |
|
| Further Information: |
|
| Organisation Website: |
http://www.cam.ac.uk |