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conferenceseries.com
October 20-22, 2016 Rome, Italy
11th International Conference and Expo on
Nanoscience and Molecular Nanotechnology
Volume 7, Issue 5 (Suppl) J Nanomed Nanotechnol 2016
ISSN: 2157-7439 JNMNT an open access journal NanoScience 2016
October 20-22, 2016
The capabilities of X-ray excited optical luminescence by using X-ray nanoprobe beamline aimed for 40
nm spatial resolution at Taiwan photon source
Bi-Hsuan Lin
National Synchrotron Radiation Research Center, Taiwan
X-ray excited optical luminescence (XEOL) and time-resolved XEOL as well as the 40 nm spatial resolution which is focused by
Montel KB mirrors are developed in the X-ray nanoprbe beamline at the new synchrotron facility, Taiwan Photon Source (TPS).
Photoluminescence (PL) is one of the efficient and fundamental tools for characterising the optical properties of the wide band gap
semiconductor materials. The advantages of using synchrotron radiation as the excitation source are that the tunable X-ray energy
allows the preferential excitation of the elements through the X-ray absorption edges, and a suitable time structure of the synchrotron
can be used to study the dynamics of luminescence of the materials. Before the nanoprobe beamline constructing completion, the
XEOL experiment was measured by unfocus X-ray beam at Taiwan Light Source (TLS). In this study, by means of XEOL to study
the optical properties of O and Zn polarity of c-plane ZnO bulks has been achieved successfully. The low temperature (less than 5K)
and temperature-dependent XEOL with X-ray excited energy below, at and above the Zn K-edge (9.659keV) were used to obtain the
further information of the optical mechanisms of the two polar faces. The first excited state (n=2) of A free exciton was observed at
3.422eV with only for O-polar. The result indicates that O-polar has higher optical quality than Zn-polar. The exciton-phonon (A1-
LO) coupling strength will be changed by using different X-ray excitation energy while the temperature above 150 K. The current
design of the nanoprobe beamline and the detail XEOL experimental results will be reported.
Biography
Bi-Hsuan Lin has completed his PhD from Department of Photonics and Institute of Electro-Optical Engineering, National Chiao Tung University, Hsinchu, Taiwan
and Postdoctoral studies from European Synchrotron Radiation Facility (ESRF) for one year. Now, he works at National Synchrotron Radiation Research Center as
the Assistant Scientist. He is participating in the construction and commission of the X-ray nanoprobe beamlime at Taiwan Photo Source (TPS), and is responsible
for development of the XEOL and TR-XEOL.
Bi-Hsuan Lin, J Nanomed Nanotechnol 2016, 7:5 (Suppl)