We report direct evidence of enhanced spontaneous emission in a photonic-crystal (PhC) light-emitting diode. The device consists of p-i-n heterojunction embedded in a suspended membrane, comprising a layer of self-assembled quantum dots. Current is injected laterally from the periphery to the center of the PhC. A well-isolated emission peak at 1.3 mu m from the PhC cavity mode is observed, and the enhancement of the spontaneous emission rate is clearly evidenced by time-resolved electroluminescence measurements, showing that our diode switches off in a time shorter than the bulk radiative and nonradiative lifetimes. (C) 2008 American Institute of Physics.
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Seoul Natl Univ, Dept Elect & Comp Engn, 1 Gwanakro, Seoul 08826, South Korea
Seoul Natl Univ, Interuniv Semicond Res Ctr ISRC, 1 Gwanakro, Seoul 08826, South KoreaSeoul Natl Univ, Dept Elect & Comp Engn, 1 Gwanakro, Seoul 08826, South Korea
Kim, Donghyun
Ha, Jaeheung
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Seoul Natl Univ, Dept Elect & Comp Engn, 1 Gwanakro, Seoul 08826, South Korea
Seoul Natl Univ, Interuniv Semicond Res Ctr ISRC, 1 Gwanakro, Seoul 08826, South KoreaSeoul Natl Univ, Dept Elect & Comp Engn, 1 Gwanakro, Seoul 08826, South Korea
Ha, Jaeheung
Park, Jongjang
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Seoul Natl Univ, Dept Elect & Comp Engn, 1 Gwanakro, Seoul 08826, South Korea
Seoul Natl Univ, Interuniv Semicond Res Ctr ISRC, 1 Gwanakro, Seoul 08826, South KoreaSeoul Natl Univ, Dept Elect & Comp Engn, 1 Gwanakro, Seoul 08826, South Korea
Park, Jongjang
Hwang, Jun
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Seoul Natl Univ, Dept Elect & Comp Engn, 1 Gwanakro, Seoul 08826, South Korea
Seoul Natl Univ, Interuniv Semicond Res Ctr ISRC, 1 Gwanakro, Seoul 08826, South KoreaSeoul Natl Univ, Dept Elect & Comp Engn, 1 Gwanakro, Seoul 08826, South Korea
Hwang, Jun
Jeon, Heonsu
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Seoul Natl Univ, Interuniv Semicond Res Ctr ISRC, 1 Gwanakro, Seoul 08826, South Korea
Seoul Natl Univ, Dept Phys & Astron, 1 Gwanakro, Seoul 08826, South KoreaSeoul Natl Univ, Dept Elect & Comp Engn, 1 Gwanakro, Seoul 08826, South Korea
Jeon, Heonsu
Lee, Changhee
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Seoul Natl Univ, Dept Elect & Comp Engn, 1 Gwanakro, Seoul 08826, South Korea
Seoul Natl Univ, Interuniv Semicond Res Ctr ISRC, 1 Gwanakro, Seoul 08826, South KoreaSeoul Natl Univ, Dept Elect & Comp Engn, 1 Gwanakro, Seoul 08826, South Korea
Lee, Changhee
Hong, Yongtaek
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Seoul Natl Univ, Dept Elect & Comp Engn, 1 Gwanakro, Seoul 08826, South Korea
Seoul Natl Univ, Interuniv Semicond Res Ctr ISRC, 1 Gwanakro, Seoul 08826, South KoreaSeoul Natl Univ, Dept Elect & Comp Engn, 1 Gwanakro, Seoul 08826, South Korea