Abstract
Optical gain of InGaN quantum well laser diodes and its internal field dependences are investigated. Gain spectra are experimentally measured by the Hakki-Paoli method. Inhomogeneous broadening of the gain spectra as well as of the electroluminescence spectra increases with In content of the active layers due to potential fluctuation. From measured carrier decay times and current density, we estimated the carrier density for which modal gain overcomes internal loss. We present gain calculation including quantum confined Stark effect, Coulomb screening and valence band structure simultaneously. Calculated and measured carrier densities are in good agreement. In InGaN quantum well laser diodes working at 470 nm, the quantum confined Stark effect reduces the optical transition probability down to 30% of its value without internal field. (Graph Presented)
Original language | English |
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Pages (from-to) | 2126-2128 |
Number of pages | 3 |
Journal | Physica Status Solidi (C) Current Topics in Solid State Physics |
Volume | 5 |
Issue number | 6 |
DOIs | |
Publication status | Published - 2008 Dec 1 |
Externally published | Yes |
Event | 7th International Conference of Nitride Semiconductors, ICNS-7 - Las Vegas, NV, United States Duration: 2007 Sep 16 → 2007 Sep 21 |
ASJC Scopus subject areas
- Condensed Matter Physics