The European Physical Journal B

, 86:387

Thickness dependence of photoluminescence-decay profiles of exciton-exciton scattering in ZnO thin films

  • Shuji Wakaiki
  • Hideki Ichida
  • Toshiki Kawase
  • Kohji Mizoguchi
  • DaeGwi Kim
  • Masaaki Nakayama
  • Yasuo Kanematsu
Regular Article

DOI: 10.1140/epjb/e2013-30631-5

Cite this article as:
Wakaiki, S., Ichida, H., Kawase, T. et al. Eur. Phys. J. B (2013) 86: 387. doi:10.1140/epjb/e2013-30631-5
Part of the following topical collections:
  1. Topical issue: Excitonic Processes in Condensed Matter, Nanostructured and Molecular Materials

Abstract

We have investigated the photoluminescence (PL) dynamics of ZnO thin films under intense excitation conditions using an optical-Kerr-gating method. The PL bands originating from exciton-exciton scattering (P emission) and biexciton (M emission) have been observed at 10 K. The ultrashort gating time of 0.6 ps has enabled us to obtain precise information of the temporal profiles of the peak energies and the intensities of the P- and M-PL bands. We have found that the decay time of the P emission becomes longer with increasing film thickness, while that of the M emission is independent of the film thickness. Although the decay time of the P emission is an increasing function of the film thickness, the relation is not in proportion, which is contrary to the predicted proportionality based on a simple model of photon-like polariton propagation.

Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Shuji Wakaiki
    • 1
  • Hideki Ichida
    • 2
  • Toshiki Kawase
    • 3
  • Kohji Mizoguchi
    • 4
  • DaeGwi Kim
    • 3
  • Masaaki Nakayama
    • 3
  • Yasuo Kanematsu
    • 1
    • 2
  1. 1.Department of Material and Life Science, Division of Advanced Science and Biotechnology, Graduate School of EngineeringOsaka UniversityOsakaJapan
  2. 2.Venture Business LaboratoryOsaka UniversityOsakaJapan
  3. 3.Department of Applied Physics, Graduate School of EngineeringOsaka City UniversityOsakaJapan
  4. 4.Department of Physical Science, Graduate School of ScienceOsaka Prefecture UniversityOsakaJapan

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