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

Kazushi Nakazawa, Hitoshi Umezawa, Minoru Tachiki, Hiroshi Kawarada

    Research output: Contribution to journalArticle

    3 Citations (Scopus)

    Abstract

    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
    Volume12
    Issue number10-11
    DOIs
    Publication statusPublished - 2003 Oct

    Fingerprint

    Diamond
    Excitons
    Diamonds
    diamonds
    excitons
    Boron
    Cathodoluminescence
    cathodoluminescence
    boron
    thresholds
    Electrons
    probes
    Liquids
    radiative recombination
    liquids
    LDS 751
    Temperature

    Keywords

    • 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
    • Materials Chemistry
    • Surfaces, Coatings and Films
    • Surfaces and Interfaces

    Cite this

    Non-linear increases in excitonic emission in synthetic type-IIa diamond. / Nakazawa, Kazushi; Umezawa, Hitoshi; Tachiki, Minoru; Kawarada, Hiroshi.

    In: Diamond and Related Materials, Vol. 12, No. 10-11, 10.2003, p. 1995-1998.

    Research output: Contribution to journalArticle

    Nakazawa, Kazushi ; Umezawa, Hitoshi ; Tachiki, Minoru ; Kawarada, Hiroshi. / Non-linear increases in excitonic emission in synthetic type-IIa diamond. In: Diamond and Related Materials. 2003 ; Vol. 12, No. 10-11. pp. 1995-1998.
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    AU - Tachiki, Minoru

    AU - Kawarada, Hiroshi

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    AB - 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.

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    KW - High-pressure high-temperature type-IIa diamond

    KW - Non-linear increase

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