Excitation dependent two-component spontaneous emission and ultrafast amplified spontaneous emission in dislocation-free InGaN nanowires

Guanjun You, Wei Guo, Chunfeng Zhang, Pallab Bhattacharya, Ron Henderson, Jian Xu

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Abstract

Amplified spontaneous emission (ASE) at 456 nm from In0.2Ga 0.8N nanowires grown on (001) silicon by catalyst-free molecular beam epitaxy was observed at room temperature under femtosecond excitation. The photoluminescence spectra below ASE threshold consist of two spontaneous emission bands centered at ∼555 nm and ∼480 nm, respectively, revealing the co-existence of deeply and shallowly localized exciton states in the nanowires. The ASE peak emerges from the 480 nm spontaneous emission band when the excitation density exceeds ∼120 μJ/cm2, indicating that optical gain arises from the radiative recombination of shallowly localized excitons in the nanowires. Time-resolved photoluminescence measurements revealed that the ASE process completes within 1.5 ps, suggesting a remarkably high stimulated emission recombination rate in one-dimensional InGaN nanowires.

Original languageEnglish (US)
Article number091105
JournalApplied Physics Letters
Volume102
Issue number9
DOIs
StatePublished - Mar 4 2013

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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