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The optical gain properties of high Al-content AlGaN quantum wells are analyzed for deep UV lasers. TM-polarized gain is expected for high Al-content AlGaN quantum wells attributed from the conduction crystal-field split-hole transition.
Deep ultraviolet photoluminescence peaks up to 5.1 eV with dramatically improved intensities are observed in GaN/AlN asymmetric-coupled quantum wells, due to recombination of electrons in AlN coupling barriers with heavy holes in GaN quantum wells.
Staggered InGaN quantum wells (QWs) are analyzed as improved active region for light-emitting diodes (LEDs) emitting at 500 nm and 540 nm, respectively. The calculation of band structure is based on a self-consistent 6-band kmiddotp formalism taking into account the valence band mixing, strain effect, and spontaneous and piezoelectric polarizations as well as the carrier screening effect. Both two-layer...
Novel InGaN-based active regions with improved momentum matrix element were investigated for achieving improved gain and radiative recombination rate. Staggered InGaN quantum wells (QWs) and type-II InGaN-GaNAs QWs demonstrated improvement in radiative recombination rate and optical gain for green spectral regime, and these active regions have the potential to be implemented for high-efficiency green...
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