Efficient observation of narrow isolated photoluminescence spectra from spatially localized excitons in InGaN quantum wells

Hideki Gotoh, Tetsuya Akasaka, Takehiko Tawara, Yasuyuki Kobayashi, Toshiki Makimoto, Hidetoshi Nakano

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3 Citations (Scopus)


We report discrete photoluminescence (PL) spectra with narrow linewidths from spatially localized excitons obtained in InGaN quantum wells (QWs) that are of a similar structure to those used in conventional optical devices. A micro-PL measurement combined with submicrometer-scale fabrication techniques allows us to create a small number of excitons in a laser spot and to detect the PL from single spatially localized excitons. A sharp PL line (linewidth: 0.34 meV limited by the resolution) is clearly obtained in a 0.2 μm mesa-shaped QW, which originates from a single localized exciton. We show that the technique is a more powerful method of examining excitonic effects than previously reported methods.

Original languageEnglish
JournalJapanese Journal of Applied Physics, Part 2: Letters
Issue number42-45
Publication statusPublished - 2005
Externally publishedYes



  • InGaN quantum well
  • Localized exciton
  • Micro-PL technique
  • Sharp PL line
  • Submicrometer-scale fabrication

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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