TY - JOUR
T1 - Deep-ultraviolet near band-edge emissions from nano-polycrystalline diamond
AU - Ishii, Ryota
AU - Fukuta, Rei
AU - Ishikawa, Fumitaro
AU - Matsushita, Masafumi
AU - Ohfuji, Hiroaki
AU - Shinmei, Toru
AU - Irifune, Tetsuo
AU - Funato, Mitsuru
AU - Kawakami, Yoichi
N1 - Funding Information:
This work is partially supported by the Research Unit project and the Joint Usage/Research Center PRIUS by Ehime University and Japan Society for the Promotion of Science (JSPS) KAKENHI grants numbers JP15H05732, JP16H06426, JP17H04810, JP17K18883, and JP19H02615.
Publisher Copyright:
© 2019, © 2019 Informa UK Limited, trading as Taylor & Francis Group.
PY - 2019
Y1 - 2019
N2 - Deep-ultraviolet continuous-wave photoluminescence spectroscopy is performed for nano-polycrystalline diamond (NPD) synthesized by a high pressure high-temperature technique. NPD exhibits clear deep-ultraviolet emissions, which originate from intrinsic excitonic transitions assisted by a momentum-conserving phonon with a photon. Surprisingly, the peak emission energy is about 30 meV higher than that of the single-crystalline diamond. Raman scattering spectroscopy indicates that the energy difference should originate from the excitonic properties of the NPD and not the phonon. Hence, NPD has a large bandgap compared to single-crystalline diamond.
AB - Deep-ultraviolet continuous-wave photoluminescence spectroscopy is performed for nano-polycrystalline diamond (NPD) synthesized by a high pressure high-temperature technique. NPD exhibits clear deep-ultraviolet emissions, which originate from intrinsic excitonic transitions assisted by a momentum-conserving phonon with a photon. Surprisingly, the peak emission energy is about 30 meV higher than that of the single-crystalline diamond. Raman scattering spectroscopy indicates that the energy difference should originate from the excitonic properties of the NPD and not the phonon. Hence, NPD has a large bandgap compared to single-crystalline diamond.
KW - electronic properties
KW - luminescence spectroscopy
KW - Near band-edge emission
KW - Raman scattering spectroscopy
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U2 - 10.1080/08957959.2019.1702658
DO - 10.1080/08957959.2019.1702658
M3 - Article
AN - SCOPUS:85076921171
JO - High Pressure Research
JF - High Pressure Research
SN - 0895-7959
ER -