Deep-ultraviolet near band-edge emissions from nano-polycrystalline diamond |
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| Authors: | Ryota Ishii Rei Fukuta Fumitaro Ishikawa Masafumi Matsushita Hiroaki Ohfuji Toru Shinmei |
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| Institution: | 1. Department of Electronic Science and Engineering, Kyoto University, Kyoto, Japanryota.ishii@optomater.kuee.kyoto-u.ac.jp https://orcid.org/0000-0002-1413-4849;3. Graduate School of Science and Engineering, Ehime University, Ehime, Japan;4. Geodynamics Research Center, Ehime University, Ehime, Japanhttps://orcid.org/0000-0002-5632-056X;5. Geodynamics Research Center, Ehime University, Ehime, Japan;6. Geodynamics Research Center, Ehime University, Ehime, Japan |
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| Abstract: | ABSTRACTDeep-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. |
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| Keywords: | Near band-edge emission luminescence spectroscopy Raman scattering spectroscopy electronic properties |
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![ORCID Icon]({"type":"image","src":"/templates/jsp/images/orcid.png"} "ORCID Icon")
https://orcid.org/0000-0002-1413-4849;3. Graduate School of Science and Engineering, Ehime University, Ehime, Japan;4. Geodynamics Research Center, Ehime University, Ehime, Japan