Internal Quantum Efficiency and Nonradiative Recombination Rate in InGaN-Based Near-Ultraviolet Light-Emitting Diodes
スポンサーリンク
概要
- 論文の詳細を見る
The internal quantum efficiency (IQE) of three types of InGaN-based near-UV light-emitting diodes (LEDs) grown on different substrates was studied by excitation-power-density-dependent and temperature-dependent photoluminescence (PL) spectroscopy. IQE was evaluated under both the band-to-band excitation of GaN cladding layers and the selective excitation of InGaN active layers. A correlation between IQE and threading dislocation density was clearly observed under both excitation conditions. In addition, the dynamics of radiative and nonradiative recombinations was studied by time-resolved PL spectroscopy. The rate of nonradiative recombination was evaluated by measuring temperature-dependent nonradiative recombination lifetime. The validity of our method for estimating IQE is discussed on the basis of the correlation between IQE and nonradiative recombination rate for three LEDs with different threading dislocation densities.
- 2012-07-25
著者
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Yamauchi Masaki
Department Od Circulation Reseach Institute Of Environmental Medicine Nagoya University
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Sudo Yasuhiro
Department Of Information And Computer Sciences Kanagawa Institute Of Technology
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Yamada Yoichi
Department Of Cellular Physiology And Signal Transduction Sapporo Medical University School Of Medic
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Yamauchi Masaki
Department of Materials Science and Engineering, Yamaguchi University, Ube, Yamaguchi 755-8611, Japan
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Kohno Takakazu
Department of Materials Science and Engineering, Yamaguchi University, Ube, Yamaguchi 755-8611, Japan
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Mitsui Kazuya
Department of Materials Science and Engineering, Yamaguchi University, Ube, Yamaguchi 755-8611, Japan
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Kudo Hiromitsu
Optoelectronics Laboratory, Mitsubishi Chemical Corporation, Ushiku, Ibaraki 300-1295, Japan
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Okagawa Hiroaki
Optoelectronics Laboratory, Mitsubishi Chemical Corporation, Ushiku, Ibaraki 300-1295, Japan
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Sudo Yasuhiro
Department of Materials Science and Engineering, Yamaguchi University, Ube, Yamaguchi 755-8611, Japan
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