| Autor: |
Malis, Oana, Pfeiffer, Loren N., West, Kenneth W., Sergent, A. Michael, Gmachl, Claire |
| Předmět: |
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| Zdroj: |
Applied Physics Letters; 2/20/2006, Vol. 88 Issue 8, p081117, 3p, 4 Graphs |
| Abstrakt: |
Mid-infrared electroluminescence from carbon-doped GaAs/AlGaAs quantum cascade structures was observed and studied to determine the prospects of hole intersubband transitions for possible use in light emitting devices. The luminescence spectra exhibit a complex three-peak structure consistent with two heavy-to-heavy hole transitions and thermal emission. The hole transition energies in emission are in agreement with corresponding absorption and photocurrent energies, but typically 17% smaller than expected from calculations of a six-band k·p model. The upper-level lifetime was estimated to be 0.4 ps, in agreement with simple calculations considering approximations of the heavy-hole effective masses. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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