Density-Matrix Approach for the Electroluminescence of Molecules in a Scanning Tunneling Microscope
2011 (English)In: Physical Review Letters, ISSN 0031-9007, Vol. 106, no 17, 177401- p.Article in journal (Refereed) Published
The electroluminescence (EL) of molecules confined inside a nanocavity in the scanning tunneling microscope possesses many intriguing but unexplained features. We present here a general theoretical approach based on the density-matrix formalism to describe the EL from molecules near a metal surface induced by both electron tunneling and localized surface plasmon excitations simultaneously. It reveals the underlying physical mechanism for the external bias dependent EL. The important role played by the localized surface plasmon on the EL is highlighted. Calculations for porphyrin derivatives have reproduced corresponding experimental spectra and nicely explained the observed unusual large variation of emission spectral profiles. This general theoretical approach can find many applications in the design of molecular electronic and photonic devices.
Place, publisher, year, edition, pages
2011. Vol. 106, no 17, 177401- p.
LIGHT-EMISSION; METAL-SURFACES; FLUORESCENCE
IdentifiersURN: urn:nbn:se:kth:diva-33953DOI: 10.1103/PhysRevLett.106.177401ISI: 000290098200005ScopusID: 2-s2.0-79960647801OAI: oai:DiVA.org:kth-33953DiVA: diva2:421624
QC 201106092011-06-092011-05-232013-05-20Bibliographically approved