Investigation of large Stark shifts in InGaN/GaN multiple quantum wells

Guibao Xu, Guan Sun, Yujie J. Ding*, Hongping Zhao, Guangyu Liu, Jing Zhang, Nelson Tansu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

Photoluminescence (PL) spectra of InGaN/GaN multiple quantum wells excited by ultrafast laser pulses are investigated over broad ranges of excitation levels and temperatures. The PL peak energy undergoes blue, red, zero, and blue shifts with increasing the excitation fluence density. Such a peculiar behavior can be explained based on competing processes of screening of the built-in electric field by the photogenerated carriers, band-gap renormalization, and band-filling effect. We have also measured and analyzed the dependence of the PL energy and linewidth on the temperature. Due to the interplay between the band-gap renormalization and band-filling effect, the PL energy shifts to the highest value, whereas the PL linewidth reaches the minimum value at ≈60 K.

Original languageEnglish (US)
Article number033104
JournalJournal of Applied Physics
Volume113
Issue number3
DOIs
StatePublished - Jan 21 2013

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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