Power dependent micro-photoluminescence of green-InGaN/GaN multiple quantum wells

Sang Youp Yim, Joon Heon Kim, Mun Seok Jeong, Seung Han Park, Jongmin Lee

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We report the excitation-power-dependent micro-photoluminescence (micro-PL) of green-InGaN/GaN multiple quantum wells grown on a sapphire substrate. By using a micro-PL imaging technique based on laser scanning confocal microscopy, bright luminescent centers emitting blue, green, and yellow bands were clearly resolved at a low excitation power. With increasing power, in addition, the strong blue-shift of PL bands from all luminescent centers was observed, with a much stronger blue-shift for initial yellow band. We show that the band-tail filling model qualitatively agrees well with our microscopic study revealing the origin of apparent bandwidth-narrowing in macroscopic ensemble PL spectra.

Original languageEnglish
Article number050204
JournalJapanese journal of applied physics
Volume50
Issue number5 PART 1
DOIs
Publication statusPublished - 2011 May 1

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

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