Time-resolved photoluminescence study of excitons in hexagonal GaN layers grown on sapphire

S. Pau, Z. Liu, J. Kuhl, J. Ringling, H. Grahn

Research output: Contribution to journalArticle

21 Scopus citations


We performed time-resolved and continuous wave photoluminescence on two samples of hexagonal GaN, one with free exciton emission and the other without. For the sample with free exciton emission, very different decay dynamics are observed between the front and backside emission. We find that the strain caused by the lattice mismatch between the sapphire substrate and the GaN film has a large influence on the population decay of the sample with free exciton emission and a minor influence on the decay properties of the sample dominated by bound exciton emission. A polariton picture is used to describe the observed behavior.

Original languageEnglish (US)
Pages (from-to)7066-7070
Number of pages5
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number12
StatePublished - Jan 1 1998


ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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