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

doi:10.1063/1.4775605

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 journal › Article › peer-review

20 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 language	English (US)
Article number	033104
Journal	Journal of Applied Physics
Volume	113
Issue number	3
DOIs	https://doi.org/10.1063/1.4775605
State	Published - Jan 21 2013
Externally published	Yes

Bibliographical note

Funding Information:
This work has been supported by U.S. DARPA and US National Science Foundation (DMR-0907260 and ECCS-1028490).

ASJC Scopus subject areas

General Physics and Astronomy

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title = "Investigation of large Stark shifts in InGaN/GaN multiple quantum wells",

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.",

author = "Guibao Xu and Guan Sun and Ding, {Yujie J.} and Hongping Zhao and Guangyu Liu and Jing Zhang and Nelson Tansu",

note = "Funding Information: This work has been supported by U.S. DARPA and US National Science Foundation (DMR-0907260 and ECCS-1028490).",

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doi = "10.1063/1.4775605",

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T1 - Investigation of large Stark shifts in InGaN/GaN multiple quantum wells

AU - Xu, Guibao

AU - Sun, Guan

AU - Ding, Yujie J.

AU - Zhao, Hongping

AU - Liu, Guangyu

AU - Zhang, Jing

AU - Tansu, Nelson

N1 - Funding Information: This work has been supported by U.S. DARPA and US National Science Foundation (DMR-0907260 and ECCS-1028490).

PY - 2013/1/21

Y1 - 2013/1/21

N2 - 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.

AB - 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.

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

Abstract

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