Power Dependent Micro-Photoluminescence of Green-InGaN/GaN Multiple Quantum Wells

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概要

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• 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.

• 2011-05-25

著者

• Park Seung-han

  Department Of Physics Yonsei University

• Jeong Mun

  Advanced Photonics Research Institute, GIST, Gwangju 500-712, Korea

• Kim Joon

  Advanced Photonics Research Institute, GIST, Gwangju 500-712, Korea

• Park Seung-Han

  Department of Physics, Yonsei University, Seoul 120-749, Korea

• Lee Jongmin

  Advanced Photonics Research Institute and School of Photon Science and Technology, Gwangju Institute of Science and Technology, 1 Oryong-dong, Buk-gu, Gwangju 500-712, Republic of Korea

• Yim Sang-Youp

  Advanced Photonics Research Institute, GIST, Gwangju 500-712, Korea

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