Non-linear increases in excitonic emission in synthetic type-IIa diamond

Kazushi Nakazawa, Hitoshi Umezawa, Minoru Tachiki, Hiroshi Kawarada*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


Free-exciton emissions increase non-linearly by cathodoluminescence (CL) above the threshold probe current of 30 μA in high-pressure high-temperature synthetic type-IIa diamond. A droplet of electron-hole liquid (EHL) is also observed by CL for the first time. Furthermore, boron acceptor bound-exciton emission as well as free-exciton emission also increases super-linearly in an unintentionally boron-contaminated area. The threshold probe current of non-linear increase of excitonic emission is in accordance with the emergence of the EHL peak. It is considered that the non-linear increase of excitonic emissions is due to the increase in the radiative recombination rate of free excitons under high exciton density.

Original languageEnglish
Pages (from-to)1995-1998
Number of pages4
JournalDiamond and Related Materials
Issue number10-11
Publication statusPublished - 2003


  • Cathodoluminescence
  • Electron-hole liquid
  • Free exciton
  • High-pressure high-temperature type-IIa diamond
  • Non-linear increase

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Chemistry(all)
  • Mechanical Engineering
  • Materials Chemistry
  • Electrical and Electronic Engineering


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