Rights statement: © Royal Society of Chemistry 2017
Accepted author manuscript, 1.2 MB, PDF document
Available under license: CC BY-NC: Creative Commons Attribution-NonCommercial 4.0 International License
Other version, 1.84 MB, PDF document
Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
<mark>Journal publication date</mark> | 18/11/2017 |
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<mark>Journal</mark> | Chemical Communications |
Issue number | 89 |
Volume | 53 |
Number of pages | 4 |
Pages (from-to) | 12120-12123 |
Publication Status | Published |
Early online date | 19/10/17 |
<mark>Original language</mark> | English |
We report the photosensitization of crystalline silicon via energy transfer using covalently attached protoporphyrin IX (PpIX) derivative molecules at different distances via changing the diol linker to the surface. The diol linker molecule chain length was varied from 2 carbon to 10 carbon lengths in order to change the distance of PpIX to the Si(111) surface between 6 A and 18 A. Fluorescence quenching as a function of the PpIX-Si surface distance showed a decrease in the fluorescence lifetime by almost two orders of magnitude at the closest separation. The experimental fluorescence lifetimes are explained theoretically by a classical Chance-Prock-Silbey model. At a separation below 2 nm, we observe for the first time, a Forster like dipole-dipole energy transfer with a characteristic distance of R-o = 2.7 nm.