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High Pressure Research
An International Journal
Volume 40, 2020 - Issue 1: Nano-Polycrystalline Diamond: Synthesis and applications
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Articles

Deep-ultraviolet near band-edge emissions from nano-polycrystalline diamond

Ryota IshiiDepartment of Electronic Science and Engineering, Kyoto University, Kyoto, JapanCorrespondence[email protected]
ORCID Iconhttps://orcid.org/0000-0002-1413-4849View further author information
ORCID Icon,
Rei FukutaGraduate School of Science and Engineering, Ehime University, Ehime, JapanView further author information
,
Fumitaro IshikawaGraduate School of Science and Engineering, Ehime University, Ehime, Japan;Geodynamics Research Center, Ehime University, Ehime, JapanORCID Iconhttps://orcid.org/0000-0002-5632-056XView further author information
ORCID Icon,
Masafumi MatsushitaGraduate School of Science and Engineering, Ehime University, Ehime, Japan;Geodynamics Research Center, Ehime University, Ehime, JapanView further author information
,
Hiroaki OhfujiGeodynamics Research Center, Ehime University, Ehime, JapanView further author information
,
Toru ShinmeiGeodynamics Research Center, Ehime University, Ehime, JapanView further author information
,
Tetsuo IrifuneGeodynamics Research Center, Ehime University, Ehime, JapanView further author information
,
Mitsuru FunatoDepartment of Electronic Science and Engineering, Kyoto University, Kyoto, JapanView further author information
&
Yoichi KawakamiDepartment of Electronic Science and Engineering, Kyoto University, Kyoto, JapanView further author information
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Pages 140-147 | Received 25 Aug 2019, Accepted 26 Nov 2019, Published online: 18 Dec 2019
 
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ABSTRACT

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.

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

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.

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