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

Ryota Ishii, Rei Fukuta, Fumitaro Ishikawa, Masafumi Matsushita, Hiroaki Ohfuji, Toru Shinmei, Tetsuo Irifune, Mitsuru Funato, Yoichi Kawakami

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


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.

Original languageEnglish
JournalHigh Pressure Research
Publication statusAccepted/In press - 2019
Externally publishedYes


  • electronic properties
  • luminescence spectroscopy
  • Near band-edge emission
  • Raman scattering spectroscopy

ASJC Scopus subject areas

  • Condensed Matter Physics


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