Optical Characterization of Double Peak Behavior in {10\bar{1}1} Semipolar Light-Emitting Diodes on Miscut m-Plane Sapphire Substrates

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概要

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• \{10\bar{1}1\} semipolar GaN-based light-emitting diodes (LEDs) grown on 1° miscut m-plane sapphires substrates via metal organic chemical vapor deposition showed undulated surface morphology with ridges and valleys. On the ridge regions, two dominant emission peaks, one at a shorter wavelength ({\sim}438 nm) and one at a longer wavelength ({\sim}490 nm), were observed using electroluminescence and micro-photoluminescence. In the valley regions, the longer peak was observed to be significantly quenched due to the grain boundary. The origin of the longer peak is believed to be not only inhomogeneous distribution of In composition in multiple quantum wells (MQWs) but also strong localization around the ridge region. Moreover, thickness variation of faceted MQWs could be associated with the peak broadening in {10\bar{1}1} semipolar LEDs. The results were also confirmed by cathodoluminescence and cross-sectional transmission electron microscopy.

• 2012-05-25

著者

• Nakamura Shuji

  Electrical And Computer Engineering Department University Of California

• Lee Dong-seon

  School Of Information And Communications Gwangju Institute Of Science And Technology

• Speck James

  Electrical & Computer Engineering and Materials Departments, University of California Santa Barbara, CA 93106, U.S.A.

• Kong Bo

  School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon 440-746, Korea

• Kong Bo

  School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon, Gyeonggi 440-746, Korea

• SONG Jung-Hoon

  Department of Physics, Kongju National University

• Bae Si-Young

  School of Information and Communications, Gwangju Institute of Science and Technology, Gwangju 500-712, Korea

• Song Jung-Hoon

  Department of Physics, Kongju National University, Gongju, Chungnam 314-701, Korea

• DenBaars Steven

  Electrical & Computer Engineering and Materials Departments, University of California Santa Barbara, CA 93106, U.S.A.

• Ahn Byung-Jun

  Department of Physics, Kongju National University, Gongju, Chungnam 314-701, Korea

• Cho Hyung

  School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon 440-746, Korea

• Cho Hyung

  School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon, Gyeonggi 440-746, Korea

• Choi Sang-Bae

  School of Information and Communications, Gwangju Institute of Science and Technology, Gwangju 500-712, Korea

• Keading John

  Electrical and Computer Engineering and Materials Department, University of California, Santa Barbara, CA 93106, U.S.A.

• DenBaars Steven

  Electrical and Computer Engineering and Materials Department, University of California, Santa Barbara, CA 93106, U.S.A.

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