2011年4月26日，我室Bio-X交叉科学研究部罗毅教授研究组合作在PRL上发表题为Density-Matrix Approach for the Electroluminescence of Molecules in a Scanning Tunneling Microscope的论文。

Source: PHYSICAL REVIEW LETTERS Volume: 106 Issue: 17 Article Number: 177401 Published: APR 26 2011
Tian GJ (Tian, Guangjun)1,2, Liu JC (Liu, Ji-Cai)2,3, Luo Y (Luo, Yi)1,2
Addresses:
1. Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Anhui Peoples R China
2. Royal Inst Technol, Sch Biotechnol, S-10691 Stockholm, Sweden
3. N China Elect Power Univ, Dept Math & Phys, Beijing 102206, Peoples R China
E-mail Addresses: luo@kth.se

Reprint Address: Tian, GJ (reprint author), Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Anhui Peoples R China

Abstract: 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.