| EPSRC Reference: |
GR/L02678/01 |
| Title: |
UNDERSTANDING NON-RADIATIVE TRANSITIONS BY SFM MODIFICATION OF BRANCHING RATIOS |
| Principal Investigator: |
Stoneham, Professor AM |
| Other Investigators: |
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| Department: |
Physics and Astronomy |
| Organisation: |
UCL |
| Scheme: |
Standard Research (Pre-FEC) |
| Starts: |
30 September 1996 |
Ends: |
29 September 1999 |
Value (£): |
153,876
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Summary on Grant Application Form |
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We propose to explore the ability of SFM to interact with individual defects and spectral selectrivity of their optical excitation to study the mechanisms of non-radiative transitions. This proposal is theoretical, buth our computer modelling will be coordinated with experimental SFM measurements of tip-induced effects on non-radiative transitions in luminescence centres near surfaces and in nanoclusters. Realistic tip models of Si02, protonated Si02 or diamond will be chosen after comparison of experiment with calculated force vs distance curves and of surface images. The interaction of the tip electric field and tip-induced stress with defects will be studied in both contact and noncontact modes, and their effect on the NRT rates and defect luminescence will be demonstrated. We propose to use these datat for the defect identification in SFM images, we shall also be able to use other results to provide estimates of local electric fields near surface steps and kinks and in nanoclusters. Specific systems are chosen to show representative classes of non-radiative transitions and because of their applications in materials science. these include F centres in alkali halides; organic electronic polymers; centres for which the transition is forbidden by symmetry [Cr in Mg0]; nanoclusters of oxides and CdS.Key Words: Atom Molecular, Condens Matter, Instrumentation, Lasers, Materials, Nantechnology, Non-radiative, Optics, Scanning
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Key Findings |
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Potential use in non-academic contexts |
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Impacts |
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| Description |
This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk |
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Sectors submitted by the Researcher |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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