TY - JOUR
T1 - Light emission from PTCDA bilayer on Au(111) induced in scanning tunneling microscopy
AU - Rzeźnicka, Izabela I.
AU - Yamada, Taro
AU - Kawai, Maki
N1 - Funding Information:
This study was financially supported in part by RIKEN President Discretionary Fund (2004–2006, 2010–2012), Lipid Dynamics Project of RIKEN and Grants-in-Aid for Scientific Research on Promotion of Novel Interdisciplinary Fields Based on Nanotechnology and Materials from the Ministry of Education, Culture, Sports, Science and Technology of Japan . One of the authors (I. I. R.) thanks the Japan Society for the Promotion of Science (JSPS) for the financial support.
Copyright:
Copyright 2011 Elsevier B.V., All rights reserved.
PY - 2011/12
Y1 - 2011/12
N2 - 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 2.35 eV. This peak is out of the range of Au local plasmon excitation, and is attributed to the transition from S1 excited state to S0 ground state of PTCDA molecule excited by direct electron injection. The fluorescence near 2.35 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).
AB - 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 2.35 eV. This peak is out of the range of Au local plasmon excitation, and is attributed to the transition from S1 excited state to S0 ground state of PTCDA molecule excited by direct electron injection. The fluorescence near 2.35 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).
KW - Au(111)
KW - Light emission
KW - PTCDA
KW - STM
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U2 - 10.1016/j.susc.2011.07.024
DO - 10.1016/j.susc.2011.07.024
M3 - Article
AN - SCOPUS:80053572886
VL - 605
SP - 2032
EP - 2037
JO - Surface Science
JF - Surface Science
SN - 0039-6028
IS - 23-24
ER -