Light emission from PTCDA bilayer on Au(111) induced in scanning tunneling microscopy

被引：4

作者：

Rzeznicka, Izabela I. ^{[1
]}

Yamada, Taro ^{[1
]}

Kawai, Maki ^{[1
,2
]}

机构：

[1] RIKEN, Adv Sci Inst, Wako, Saitama 3510198, Japan

[2] Univ Tokyo, Dept Adv Mat Sci, Chiba 2778561, Japan

来源：

SURFACE SCIENCE | 2011年 / 605卷 / 23-24期

基金：

日本学术振兴会;

关键词：

STM; Light emission; Au(111); PTCDA; ORGANIC THIN-FILM; NOBLE-METAL SURFACES; MOLECULAR-BEAM DEPOSITION; DIANHYDRIDE PTCDA; PHOTON-EMISSION; PLASMON MODES; GROWTH; TRANSISTORS; EXCITONS; STM;

D O I：

10.1016/j.susc.2011.07.024

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We studied the light emission induced by tunneling electrons of scanning tunneling microscopy (STM) from well-defined 3,4,9,10-perylenetertracarboxylic dianhydride (PTCDA) bilayer, vapor deposited under ultrahigh vacuum condition on Au(111) single crystal surface. We detected visible fluorescence over the second layer of PTCDA. The light emission spectrum contained a fluorescence peak at 1.75 eV of photon energy at STM bias voltages below 2.5 V. When the bias voltage was set above 2.5 V. another fluorescent peak was observed at 235 eV. This peak is out of the range of Au local plasmon excitation, and is attributed to the transition from SI excited state to So ground state of PTCDA molecule excited by direct electron injection. The fluorescence near 235 eV was reported in dilute solution of PTCDA by optical excitation. This intrinsic molecular fluorescence indicates that the 2nd layer PTCDA molecules were significantly isolated from environment over the presence of the 1st layer on Au(111). (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：2032 / 2037

页数：6

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