Abstract
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).
| Original language | English |
|---|---|
| Pages (from-to) | 2032-2037 |
| Number of pages | 6 |
| Journal | Surface Science |
| Volume | 605 |
| Issue number | 23-24 |
| DOIs | |
| Publication status | Published - 2011 Dec |
| Externally published | Yes |
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Keywords
- Au(111)
- Light emission
- PTCDA
- STM
ASJC Scopus subject areas
- Surfaces and Interfaces
- Condensed Matter Physics
- Materials Chemistry
- Surfaces, Coatings and Films
Cite this
Light emission from PTCDA bilayer on Au(111) induced in scanning tunneling microscopy. / Rzeznicka, Izabela Irena; Yamada, Taro; Kawai, Maki.
In: Surface Science, Vol. 605, No. 23-24, 12.2011, p. 2032-2037.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Light emission from PTCDA bilayer on Au(111) induced in scanning tunneling microscopy
AU - Rzeznicka, Izabela Irena
AU - Yamada, Taro
AU - Kawai, Maki
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
UR - http://www.scopus.com/inward/record.url?scp=80053572886&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=80053572886&partnerID=8YFLogxK
U2 - 10.1016/j.susc.2011.07.024
DO - 10.1016/j.susc.2011.07.024
M3 - Article
VL - 605
SP - 2032
EP - 2037
JO - Surface Science
JF - Surface Science
SN - 0039-6028
IS - 23-24
ER -